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WO2013030667A1 - Appareil de tamisage vibrant - Google Patents

Appareil de tamisage vibrant Download PDF

Info

Publication number
WO2013030667A1
WO2013030667A1 PCT/IB2012/001968 IB2012001968W WO2013030667A1 WO 2013030667 A1 WO2013030667 A1 WO 2013030667A1 IB 2012001968 W IB2012001968 W IB 2012001968W WO 2013030667 A1 WO2013030667 A1 WO 2013030667A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
screen
screening
weir
module
Prior art date
Application number
PCT/IB2012/001968
Other languages
English (en)
Inventor
Marshall Graham Bailey
Original Assignee
Marshall Graham Bailey
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB1115212.1A external-priority patent/GB201115212D0/en
Priority claimed from GBGB1207292.2A external-priority patent/GB201207292D0/en
Application filed by Marshall Graham Bailey filed Critical Marshall Graham Bailey
Priority to GB1404273.3A priority Critical patent/GB2507932B/en
Publication of WO2013030667A1 publication Critical patent/WO2013030667A1/fr
Priority to NO20140421A priority patent/NO342325B1/no

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation

Definitions

  • the invention relates to vibratory screening apparatus for use in separation of drilled solids generated during the process of drilling an oil well, from drilling mud. It is also applicable in wider applications such as mineral processing, dewatering, processing of waste fluid streams, quarrying, pharmaceuticals and food processing.
  • vibratory screening machines such as the so called 'shale shakers' of the oil well drilling industry are used with success in methods of solids/liquids separation, especially classification, there is a need to improve throughput and effectiveness. This is especially the case where available space is severely limited, for example on offshore oil rigs, and the option of increasing equipment size or the numbers of machines employed may not be available.
  • WO/2004/110589 PCT/GB2004/002544 - Axiom Process Limited
  • vibratory screening machines including a stack of screen assemblies mounted in a vibrating basket for solids/liquid separation
  • the improved machines include a flow distributor arrangement that can allow parallel processing through two screens mounted in a stack thereby increasing throughput.
  • the flow distributor can allow both parallel and series processing and thereby increases the scope of possible operations of a given size of machine.
  • Such machines are employed for separating out solids from a solids and liquid feed (used drilling mud) to allow recycling of a cleaned fluid stream, disposal of unwanted solids and in some cases recovery of solids of a selected size range for reuse.
  • a conduit including a screening portion and formed and arranged to divide a liquid and solids mixture feed flowing through the conduit into a first, cleaned stream comprising liquid and solid particles of below a selected size limit, and a second, concentrated, stream comprising liquid, and particles above the selected size limit.
  • the conduit including a screening portion may be advantageously integrated into the vibrating basket of a vibratory screening machine as described in PCT/GB201 1/000960. Advantages of using the conduit to divide a liquid and solids mixture feed include reducing the fluid load on shale shakers or shale shaker screens thereby permitting faster throughput and/or requiring less equipment for a given task.
  • the present invention provides an apparatus for use in screening a liquid and solids mixture feed, the apparatus comprising:
  • a conduit including a screening portion and formed and arranged to divide a liquid and solids mixture feed flowing through the conduit into a first, cleaned stream comprising liquid and solid particles of below a selected size limit, and a second, concentrated, stream comprising liquid, and solid particles above the selected size limit;
  • an outlet for the second concentrated stream from the screening portion is in the form of a weir assembly
  • the weir assembly comprising:
  • a trough in fluid communication with said screening portion and having a bottom wall disposed at a lower height than the bottom wall of the screening portion;
  • the division of the feed into the two streams may be accomplished by use of a suitable screen in the screening portion of the conduit, for example a screen of a woven wire mesh, wedge wire, moulded plastics, synthetic woven fabrics or drilled plates of either plastic or metal.
  • the apertures in screening plates may be produced by laser or chemical etching processes or some other suitable method.
  • Both of the two streams are flowable; the first stream can flow or be pumped to a holding tank, or to a further processing step or be recycled directly and reused.
  • the second stream can flow or be pumped to the screening or other solids liquid separation apparatus.
  • the second stream is concentrated in the sense that the amount of solid particles above the selected size has been increased relative to the liquid volume.
  • the first stream removes liquid (and undersize solids) from the first stream that can then be further processed in screening or other solids liquid separation apparatus as required.
  • the screening portion of the conduit employed in the apparatus, described herein may take several different forms.
  • the conduit may be a pipe or channel having a screen mesh or other filter material that replaces part of its wall.
  • a screen may be of a mesh mounted on and/or tensioned across an apertured support plate. Screens may be mounted vertically, horizontally or at any angle or combination of angles between vertical and horizontal.
  • the first, cleaned stream or filtrate liquid together with solids below the mesh size
  • a further section e.g. a branch
  • the conduit may incorporate a secondary, internal conduit (e.g. a pipe) that has a portion of wall replaced by a screen mesh or other screen or filter material. Liquid and undersized solids from the feed passing along the (outer) conduit, passes through the screen mesh and into the internal conduit and is then directed as required.
  • a secondary, internal conduit e.g. a pipe
  • Liquid and undersized solids from the feed passing along the (outer) conduit passes through the screen mesh and into the internal conduit and is then directed as required.
  • Multiple internal conduits may be employed and may be formed in any convenient shape or shapes to provide the desired division into the two streams and overall flow rate. For example cylinders, hexagonal prisms or cuboids.
  • Screens may be for example, spaced apart from each other and stacked in a section of conduit.
  • series screening in the conduit may be obtained e.g. by having two internal conduits, one inside the other and each having a screening portion.
  • suitable outlets are provided for the flows from each stage of screening as exemplified hereafter with reference to a specific embodiment.
  • the screening portion of the conduit may be generally horizontally disposed. This arrangement is advantageous, for example, when the apparatus is fitted as part of the processing equipment in the basket of a vibratory screening machine such as a shale shaker.
  • the apparatus can then be conveniently fitted in a stack of screen decks such as commonly used in shale shaker technology.
  • the screening portion may be provided in the form of a replaceable screen assembly, for example in the form of a wire mesh mounted on an apertured support plate.
  • a support frame may be employed to support a mesh or a mesh on an apertured support plate.
  • the screen assembly is releasably fixed in place as part of a wall, typically a generally horizontally disposed bottom wall, of the screening portion of conduit.
  • a replaceable screen assembly may conveniently be held in place by means of inflatable seals (pneumatic seals) such as are often used for fixing and sealing screen assemblies of normal screen decks in shale shaker technology. The seals may also act to tension the screen.
  • a baffle is provided above the trough of the weir assembly and disposed across the horizontal direction of flow of the second concentrated stream in the screening portion.
  • the trough extends across the width of the screening portion of the conduit.
  • the trough will generally have a rounded bottom wall, for example a generally U or a generally part cylinder cross section to provide a smooth flow path.
  • the apparatus includes vibratory means.
  • the vibratory means vibrates the conduit and its contents, aiding both the screening of the first cleaned stream through the screening portion and also in keeping solids flowing through the conduit and over the weir in suspension.
  • the vibratory means may be connected directly to or be installed within the weir assembly or may be connected directly to or be installed within the conduit.
  • the vibratory means may be the vibratory drive used to vibrate the shale shaker basket. Where such an arrangement is used additional vibratory means may also be provided for the weir assembly or conduit.
  • the present invention provides a weir assembly for an apparatus for use in screening a liquid and solids mixture feed, the weir assembly comprising: a trough formed for being in fluid communication with a screening portion of a conduit according to the first aspect of the invention and having a bottom wall disposed at a lower height than the bottom wall of the screening portion; and
  • a baffle may be provided above the trough and disposed across the horizontal direction of flow of the second concentrated stream in the screening portion.
  • the weir assembly according to the second aspect has notable advantages when employed as the outlet for a screening portion of a conduit.
  • a weir including a trough has notable advantages, especially but not exclusively when used with a horizontally disposed screening portion.
  • the trough, especially in combination with a baffle has been found to provide a self clearing action to act against a concentration or even a build up of solids that can occur as the flow along the conduit is directed up over the outlet of the weir. Further benefits are found especially where the screening carried out by the conduit is carried out by fitting a mesh screen to the bottom wall of the screening portion.
  • a weir assembly without a trough may be employed, i.e. a conventional weir. If this is done when the screening portion has a mesh screen fitted to the bottom wall of the horizontally disposed screening portion, then the problems associated with concentrated solids damaging the mesh screen can be avoided by not providing mesh adjacent to the weir.
  • the bottom wall of the screening portion near the weir can be of a solid plate.
  • a baffle on the weir assembly is optional, but may be advantageously employed across the horizontal direction of flow of the second concentrated stream in the screening portion to restrict the cross section area of flow (resulting in increased velocity) and/or increase turbulence in the flow to assist in solids clearance.
  • Vibratory means such as discussed above may be employed with a weir assembly of the third aspect of the invention, to aid screening and flow. Other means of avoiding possible solids build up at the weir assemblies of the invention are described hereafter and with reference to specific embodiments.
  • the apparatus according to the first aspect of the invention is mounted in a vibrating basket or is itself mounted on resilient members and is directly vibrated. It may have a downwards directed (e.g. vertical) inlet end followed by the generally horizontally disposed screening portion that has a screen mesh replacing a portion, for example an upper or a lower portion of conduit wall.
  • the conduit continues by having an outlet in the form of the weir assembly of the second aspect of the invention described above.
  • the second stream flows over the weir assembly outlet and may then be directed to a subsequent screening process.
  • This form of conduit, with an overall 'IT (or 'J') shape provides a robust, relatively simple in construction apparatus.
  • the mixture feed flows around the U by virtue of the head pressure from the inlet end.
  • the head pressure produced by the raised outlet end acts to force liquid and undersize solids through the screen mesh to produce the first cleaned stream, that can then be directed as desired, for example to a tank for recycling.
  • the 'IT (or 'J') shape conduit may have a weir assembly in accordance with the third aspect of the invention.
  • an apparatus according to the first aspect of the invention in particular in the U or J shaped conduit form described above, can be provided as one processing stage in the basket of a vibratory screening machine, as part of a stack of screening stages.
  • the other stages in the stack will typically be of more conventional screen assemblies ('screen decks') where separation of solids from a solids and liquids stream is carried out in the known manner i.e. typical 'shale shaker' operations.
  • the provision of an apparatus according to the first aspect of the invention as one of a stack of superposed screening stages can provide a particularly compact and versatile arrangement.
  • the present invention provides a processing module for use in the basket of a vibratory screening machine, the processing module comprising an apparatus according the first aspect of the invention or an apparatus according to the third aspect of the invention.
  • the processing module is provided as a detachable module for optional use in the basket of a vibratory screening machine, the vibratory screening machine being adapted for the optional use of the module and/or other processing modules.
  • the present invention provides a modular vibratory screening machine (in particular a shale shaker) comprising a basket formed and arranged for mounting, or a basket constructed from processing modules selected from: a processing module according to the fourth aspect of the invention, a top screen or scalping deck, a conventional single deck screening module, a dual deck screen module, a dual deck screen module with a flow distribution system allowing parallel or series processing on the two screens, a dual deck screen module with a flow distribution system switchable between allowing parallel or series processing on the two screens, a multiple deck screen module having three or more screens in a stack, a multiple deck screen module having three or more screens in a stack with flow distribution system, and a flow distribution module for fluid interconnection between screen decks and/or between modules.
  • a processing module according to the fourth aspect of the invention a top screen or scalping deck
  • a conventional single deck screening module a dual deck screen module
  • a dual deck screen module with a flow distribution system allowing parallel or series processing on the two screens
  • the processing module may be provided as an integral part of a basket of a vibratory screening machine, typically with a replaceable screen assembly comprising a screen that can be removed for repair and replacement as required.
  • a vibratory screening machine in particular a shale shaker
  • a basket of the vibratory screening machine comprising an apparatus according to the first or the third aspect of the invention described herein.
  • the basket will typically comprise further superposed screening stages such as one or more screen decks which may have associated flowback pans.
  • the flow distribution system or flow distributor when provided, may be an integral part of a module containing two or three screen deck arrangements or may be provided as a separate module for optional fitting when two or three decks (or more) are in use.
  • the optional flow distribution module may be replaced by appropriate blanking off or other sealing means so that the screen decks fitted may operate in the normal series processing fashion.
  • a flow distribution system may take the form of those described, for example in WO/2004/110589.
  • flow of solids and liquid may be divided for parallel processing by means of a weir at one end of an inclined upper screen deck, with one portion of the flow passing over the weir and directed to a lower screen deck and the other portion of the flow remaining for filtration through the upper screen deck.
  • the flow rate to the weir is typically high.
  • a deflector plate or baffle is provided in front of the weir to modulate the flow over the weir hereafter with reference to a specific embodiment.
  • the shale shakers according to either the fifth or the sixth aspect will also include the usual functional components, as appropriate for the use, such as the drive unit to provide vibratory action; a feed chute or other inlet for a liquid and solids feed; outlets for the screened product and separated solids as required; support springs for the basket and a base for the unit as a whole.
  • the drive unit to provide vibratory action such as the drive unit to provide vibratory action; a feed chute or other inlet for a liquid and solids feed; outlets for the screened product and separated solids as required; support springs for the basket and a base for the unit as a whole.
  • a processing module according to the fourth aspect that may operate in series to provide progressive screening through successively finer meshes, solids of a selected size collected on the upper of these two decks, may be directed via an outlet for recycle to the fluid or to further processing, i.e. selected size solids may be recovered for reuse.
  • Typical screening modules for example a scalping deck or other screen decks modules will comprise a screen assembly or screen assemblies and may include a corresponding flowback pan or pans such as are well known in the art.
  • the modules will include appropriate inlets and outlets for interconnection with other modules and/or to accept a feed or discharge a filtrate or separated solids.
  • the modules can be made demountable and interchangeable by providing suitable releasable fastenings between the vibratory basket and the selected module.
  • the basket may be provided with flanges running along the side of its walls onto which corresponding flanges of a module sit. The corresponding pairs of flanges are then bolted together or otherwise secured by suitable fastenings.
  • the basket itself may be made up of one or more modules, selected for the intended use.
  • the modules are stacked one above the other, in the appropriate order for the use, to form the basket; typically sitting on springs mounted on a base.
  • the modules may be fixed together by bolting or other wise securing corresponding flanges, running along the sides of module walls.
  • the vibratory drive unit may then be bolted onto the topmost module typically, for example a scalping screen deck.
  • the baffle may comprise or may be a plate directed downwards towards the trough and disposed across the horizontal direction of flow of the second concentrated stream. It acts to direct the flow firstly down into the trough and then, where the weir outlet (typically defined by a wall over which the stream flows) extends to a height above the bottom edge of the baffle, defines a channel up out of the trough for the flow.
  • the baffle extends downwards at least to the height of the bottom wall of the screening portion.
  • baffles extends downwards to below the height of the bottom wall of the screening portion i.e. the baffle extends into the trough of the weir assembly. This ensures that the flow through the weir assembly is more positively directed downwards into and then upwards out of the trough.
  • Baffles may be height adjustable, for example removable and replaceable with a baffle of a different height or by the provision of a sliding portion of baffle that may be fixed at a selected height with respect to the bottom of the trough.
  • An adjustable in use baffle may be employed to aid clearance of a blockage. Adjusting the baffle height as processing continues alters the flow rate and/or pressure and/or the flow characteristics (turbulence) in the apparatus especially in the weir assembly. This can act to free a blockage.
  • the weir outlet is typically defined by a wall over which the second concentrated stream flows.
  • the height of the weir outlet may be fixed or adjustable to allow adjustment of flow rate.
  • the weir may be adjustable in width.
  • Other means of adjusting the flow rate out of the weir can include having a weir outlet that is in the form of an orifice whose size (cross section area) is adjustable.
  • the pressure in the conduit and out over the weir outlet wall can also be varied, for example by adjusting the fluid head at the inlet to the conduit or by providing a feed into the conduit via a pump that can provide variable pressure to the system.
  • an apparatus is a module used in the basket of a vibratory screening machine, it may be convenient to direct the flow passing over the weir, by means of a flowback pan, to an end of the basket distal to the weir, where further processing (e.g. screening) can occur.
  • the weir assembly may be formed as a "closed to atmosphere" fluid path with the screening portion when in use.
  • the stream flows from the end of a flooded screening portion into the trough, up over the weir outlet, and downwards into a subsequent conduit, all closed to atmosphere, until at least the stream is below the height of the bottom wall of the trough.
  • This arrangement can provide a siphon effect around the weir assembly which can assist in preventing solids build up in the trough.
  • the screening portion may screen through a mesh or other suitable screening material provided on the bottom wall of the screening portion.
  • the screening action providing the first, cleaned stream may be by a downwards filtration from the conduit through the mesh.
  • upwards screening through a mesh out of the screening portion of the conduit is noted to have certain advantages in terms of for example avoiding blinding of the screening material and reducing wear on the mesh.
  • a generally downwards filtration can be advantageous as all filtered fluid streams (filtrates) in such machines normally proceed downwards, typically onto a flowback pan for further processing or directing out of the machine, or straight down to a sump or other holding tank.
  • a standard or substantially standard basket and associated equipment may be used with little or no modification. This benefit is even greater where the processing module is to be used in a modular vibratory screening machine of the invention.
  • a flowback pan may be used to direct the filtrate (first stream) out of the machine for reuse or further processing as desired.
  • the screening portion of the conduit may be an open channel i.e. without a top wall, however an arrangement where the screening portion of conduit is a pipe (i.e. substantially closed or closed apart from inlet end, outlet end and passage through the screen) is advantageous as the dimensions of the conduit then affect the pressure and velocity and hence flow rates there through. Where a mesh or other suitable screening material is provided on the bottom wall of the screening portion, ensuring that the unscreened solids and liquid mixture is kept flowing along the conduit helps to prevent screen blinding.
  • a particularly convenient form of the apparatus according to the first aspect of the invention may take the following form i.e. the apparatus may comprise the following features: It has a downwards directed (e.g. vertical) inlet end followed by a generally horizontally disposed screening portion that has a screen mesh replacing a portion of, preferably all or substantially all of the bottom wall of a generally rectangular in cross-section section of conduit, that is substantially closed or closed apart from outlet, inlet and screen mesh i.e. a rectangular in cross section pipe having a bottom, two side and a top walls.
  • a downwards directed (e.g. vertical) inlet end followed by a generally horizontally disposed screening portion that has a screen mesh replacing a portion of, preferably all or substantially all of the bottom wall of a generally rectangular in cross-section section of conduit, that is substantially closed or closed apart from outlet, inlet and screen mesh i.e. a rectangular in cross section pipe having a bottom, two side and a top walls.
  • top wall or a portion of the top wall of the pipe may be employed as a flow back pan or flow directing tray for a liquid and solids mixture feed (e.g. arriving from a previous screening operation) to direct the feed into the inlet end.
  • a separate flow back pan may be provided for directing flow to the inlet end, either as part of the module or as part of the previous screening apparatus.
  • the conduit is substantially closed or is closed apart from the outlet, inlet and screen mesh.
  • the pipe may be provided with at least one other passage or aperture to allow a portion of the feed to enter the conduit without passing through the inlet end as described in more detail hereafter with reference to a specific embodiment.
  • the passage or passages typically in the top wall of the pipe, increase the flow into the screening portion of the conduit and can help to avoid flooding of a processing stage above caused by insufficient flow through the inlet end. At the same time the flow into the conduit via the passages increases flow therein and can aid in avoiding blockages.
  • Advantageously passages are positioned at an edge of the conduit parallel to the general direction of flow (e.g. in the top wall and at the edge(s) with the side walls of a rectangular cross section pipe). This arrangement tends to prevent the flow passing through the passages from falling directly onto a screen of the screening portion where it may increase wear or cause damage.
  • the flow will tend to run down the sides of the conduit as it mixes with the larger flow from the inlet end and/or will tend to be directed at edges of the screening portion where, typically, screen supports or tensioning devices are located i.e. screening material such as relatively delicate wire meshes are not present.
  • a flow back pan may be provided below the bottom wall of the conduit to direct the first stream (filtrate) passing through the screening portion, for example to an outlet from a screening machine.
  • the conduit continues by having an outlet in the form of the weir assembly of the second aspect of the invention described above.
  • the weir assembly includes a baffle that extends downwards to below the height of the bottom wall of the screening portion.
  • the second stream flows over the weir assembly outlet and may then be directed to a subsequent screening process, for example by a flowback pan provided below a flowback pan for the first stream.
  • the mixture feed flows around the U shape by virtue of the head pressure from the inlet end.
  • the head pressure produced by the raised outlet end also acts to force liquid and undersize solids through the screen mesh to produce the first cleaned stream, that can then be directed as desired, for example to a tank for recycling.
  • the head pressure also acts to flow the second concentrated stream around the weir assembly and over the weir outlet.
  • weir assembly of the processing module may be provided in accordance with the third aspect of the invention, or even may take the form of a conventional weir without the bottom wall of the screening portion near the weir being of a solid plate.
  • vibratory screening machines in particular shale shakers, according to either the fifth or the sixth aspects of the invention may comprise a stack of the following items, in order from the top of the basket: a scalping screen deck; a processing module in accordance with the fourth aspect of the invention, that may be of the preferred form discussed above; and a further two screen decks, stacked one above the other and provided with a flow distributor to allow series or parallel processing.
  • a scalping screen deck in accordance with the fourth aspect of the invention, that may be of the preferred form discussed above
  • a further two screen decks stacked one above the other and provided with a flow distributor to allow series or parallel processing.
  • a flow distributor to allow series or parallel processing.
  • Such a machine may include one or both of the following features:
  • a flow back pan provided below the scalping screen that directs filtrate from the scalping screen into the downwardly directed inlet end of the processing module.
  • the flowback pan is formed to prevent filtrate from the scalping deck dropping directly onto the screen of the screening portion, but directs the flow into an inlet from where it flows along the conduit past the screening portion.
  • Flowback pans for both the first and second streams from the processing module directs that flow out of an end of the basket from where it may be directed further for recycle or further processing.
  • the flowback pan for the second stream directs that flow to one end of the upper of the two screen decks, where the flow distributor is located.
  • FIGS. 1 , 2 and 3 show apparatus including weir assemblies according to the present invention
  • FIGS. 4 and 5 illustrate aspects of the operation of apparatus of the invention
  • FIG. 6 illustrate different features of weir assemblies
  • Figure 7 shows a modular vibratory screening machine
  • Figure 8 shows the operation of a modular vibratory screening machine
  • Figures 8a, 8b, 8c and 8d show in schematic detail optional features of a vibratory screening machine
  • Figures 9 show various options for a modular vibratory screening machine.
  • FIG. 1 shows in cross section schematic a processing module 1 in accordance with the fourth aspect of the invention, including an apparatus according to the third aspect of the invention, in schematic cross section.
  • the module 1 will typically be mounted in the vibrating basket (not shown) of a shale shaker type vibratory screening machine.
  • the module includes a conduit 2 that is a generally U shaped, rectangular in cross section pipe having an inlet end 4 for receiving a solids and liquid mixture feed (such as a used drilling mud) indicated by arrow 6.
  • the horizontally disposed section 8 of conduit 2 has a mesh screen 10 forming substantially its entire bottom wall 12 in this example.
  • the section 8 is thus a screening portion of the conduit.
  • the vibratory action is suggested by double headed arrow 13.
  • the module 1 will generally be sized, to maximise possible throughput, so that the area of mesh screen 10 will approximate that of a full size conventional screen deck that may be fitted to the basket employed.
  • Solids 14 retained by the screen 10 (not passing through it in cleaned stream 15) are transported by a combination of fluid flow and vibratory action along the screen face to the discharge end 16 of the screen. At the discharge end 16 of the screen the solids may concentrate until they are transported over the wall 18 of weir assembly 20. If a greater concentration of solids 14 are allowed to collect on top of the screen mesh 10 the abrasive action of the solids can cause premature screen wear and result in premature failure.
  • a module of the form shown in figure 1 has some self clearing action, if a sufficient head can be accommodated in inlet 4 to produce suitable pressure in the flow, to dislodge solids 14, but such increased pressure adds to the stress on the mesh screen 10.
  • the pressure in the inlet feed 6 depends on the height of inlet 4 where higher pressures are required the corresponding inlet height may not be practical, especially where it is desired to accommodate the module 1 in a relatively compact shale shaker.
  • FIG. 1 a shows in partially cut away schematic perspective view, a detail of a modified module of the same general form as that of figure 1.
  • the mesh screen 10 of the bottom wall 12 is replaced by a solid plate 24, more capable of withstanding wear due to solids build up and the abrasion caused by the motion of solids.
  • an optional baffle 26 may be fitted across the flow.
  • the baffle 26 increases turbulence, aided by one or more optional notches 28.
  • a notch allows localised flow through the notch to be maintained when the rest of the flow path may be blocked.
  • As solids build the flow path past the baffle reduces in size and the velocity of fluid passing the notch or notches increases. The increased velocity carries solids forward helping to avoid plugging.
  • the height shape and position of the notch or notches 28 and of the baffle 26 can be varied.
  • FIG. 2 shows another processing module 1 in accordance with the fourth aspect of the invention in schematic cross section.
  • the arrangement shown is similar to that of figures 1 except that the module takes the form of an apparatus according to the first aspect of the invention with a weir assembly 20 in accordance with the second aspect of the invention.
  • the weir assembly 20 includes a trough 30 at the discharge end 16 of the screen.
  • the trough 30 has a baffle 26 above and projecting downwards into it (see figure 2a). Solids 14 transported to the end of the screen fall into the trough 30 that is located below the level of the screen mesh 10.
  • the baffle 26 projects below the screen level. The flow passing the baffle 26 washes solids 14 in the trough 30 upwards and over the weir outlet wall 18.
  • FIG. 2a shows in partially cut away schematic perspective view, a detail of the module of figure 2, showing especially the weir assembly 20, with its trough 30 at the discharge end 16 of the screening portion of the conduit 2 and a baffle 26 that is a plain sheet across the direction of flow.
  • FIG. 2b shows a similar arrangement except that baffle 26 includes activation elements 32, projections that can serve to increase turbulence in the flow around the baffle thereby avoiding build up of solids in the trough 30.
  • Figure 2c shows a yet further similar arrangement to that of figure 2a except that the baffle 26 has notches 28, in this example a serpentine curve to the bottom edge of the baffle plate, to aid flow and clearance of solids.
  • Alternative notch 28 arrangements are shown in the details of baffles 26 shown in figure 2d.
  • FIGs 2e and 2f show yet further examples of baffle assembly and conduit arrangements.
  • a baffle 26 with inverted V notches 28 is employed and the screen mesh 10 runs up to the end of bottom wall 12.
  • the discharge end 16 of conduit 2 includes a plate 24 to avoid wear that may occur in the vicinity of the trough 30 and baffle 26 arrangements.
  • FIG. 3 shows another processing module 1 in accordance with the fourth aspect of the invention in schematic cross section, showing the discharge end 16 of the conduit 2 and a weir assembly similar to that of figure 2 but modified to obtain the benefit of a siphon effect.
  • the weir assembly 20 is provided with a closed to atmosphere outlet portion of conduit by the enclosure of the flow of the concentrated stream 22 in pipe 34 as it passes over the weir outlet wall 18 and down below the level of the bottom 36 of trough 30.
  • a siphon effect may be obtained from discharge end 16, through the trough 30 and up over weir wall 18 to the end 36 of pipe 34.
  • This siphon effect may assist in clearance of a partial blockage caused by build up of solids 14.
  • Such a siphon effect may also be obtained with an apparatus in accord with the third aspect of the invention.
  • a fluid and solids mixture feed 6 is introduced at inlet end 4.
  • a head of fluid is established above the screen mesh 10 equivalent in height to 38, the level that which the top of weir outlet wall 18 reaches above screen 10.
  • a proportion of fluid passes the screen 10 forming the cleaned stream 15 and exits the module at 40 (figure 5) having flowed over flowback pan 42.
  • the flowback pan is at the same height as the bottom of trough 30, a compact in height arrangement.
  • the volume of fluid passing screen 10 is directly proportional to the head of fluid 38 above screen. Thus as head 38 is increased the process volume of the module increases. Screen 10 retains solids above screen aperture size. Retained solids are transported by a combination of the velocity of fluid passing baffle 26 in weir assembly 20 and the vibratory action of the machine 13. Solids pass from the screen 10 into trough 30, where they collect below the level of screen 10. Fluid passing through trough 30 is directed downwards below the level of screen 10 by the baffle 26. When passing baffle 26 a flow velocity is established that is relative to the width of gap 42 between the solids 14 and baffle 26.
  • the ratio of fluid passing screen 10 and volume of fluid passing baffle 26 varies dependent upon factors such as the input rate, size of screen and screen mesh 10 and height of weir outlet wall 18.
  • a module of this type will normally be installed in a basket of a vibratory screening machine with or without bypass means (not shown in figures 4 and 5) provided to allow the feed to bypass the whole module or, if screening of solids on the screen 10 is desired, the weir assembly 20.
  • a bypass may also be used if the weir assembly of a module of the invention is blocked, allowing at least some processing function to continue whilst remedial action is taken. If the screening operation of a module is not required then the screen 10 may be replaced by or covered by a plate.
  • modules of the invention may be provided with various optional features to increase the functionality of the module/apparatus and/or the vibratory screening machine containing it.
  • optional features can include:
  • a replaceable screen may be removable from the end of the module distal to a weir assembly which may be fixed or removable.
  • the screen 10 allows the screen 10 to be easily replaced by or overlaid by a solid plate so that all of the feed into the module will flow through the conduit and over the weir, or out via a bypass, without having been divided by a screening portion.
  • weirs having different outlet height can be fitted. For example, to adjust flow rates. For example, to provide a zero height weir, where the weir outlet is at the same level as the screen. This can be used to minimise impedance to flow of the concentrated stream.
  • a zero height weir is useful for example, when a solid plate replaces the screening portion or overlays the screen, allowing the feed to flow readily through the module.
  • a zero height weir is useful for example, when a solid plate replaces the screening portion or overlays the screen, allowing the feed to flow readily through the module.
  • a weir outlet adjustable in width - This allows control of flow through and out of the conduit.
  • a conduit supplied with feed via a pump - This allows adjustment of pressure and hence flow rate within the conduit.
  • This feature may be combined with an adjustable height weir or a weir outlet in the form of an adjustable orifice to provide control over flow velocities and throughput.
  • a sight glass or sight gauge may be fitted to allow viewing of the level of fluid in the screening portion of the conduit.
  • the function of the module is to separate the input feed 6 into two streams.
  • the larger, first, stream 15 being a volume of cleaned fluid and the smaller second stream 22 being concentrated in terms of solids (of above the selected screen size) to fluid content, containing the solids not passing screen 10.
  • This function of concentrating solids into a smaller volume of fluid (stream 22) allows the size and quantity of liquid/solids separation equipment operating downstream of the module to be decreased whilst operating efficiency of such equipment may be increased.
  • Input volume between 50 and 2000 US gallons per minute.
  • Fluid passing screen 10 between 10% and 95% of input volume 6
  • Screen size of screen 10 between 10 mesh and 600 mesh.
  • the area of screen 10 may be varied between 0.5 and 35 square feet. It will usually be comparable in area to that of a conventional screen deck that may be supplied in the same vibrating basket.
  • a typical basket size may be of the order of 2000mm length, 1600 mm high and 1200mm wide, but can be varied widely to suit the throughput required.
  • modules and machines fitted with the modules of the invention may be adjustable or fixed:
  • the module may be used as a stand-alone module ahead of conventional shale shakers. In this role it concentrates the solids above module screen size into a smaller volume of fluid. This reduces the volume of fluid that is required to be processed by downstream liquid solids equipment such as shale shakers and centrifuges allowing this equipment to be operated providing higher efficiency of solids liquid separation.
  • Example The effect of installation of a module ahead of a conventional set of shakers reduces the fluid volume to be processed by those shakers.
  • the shakers may be operated with smaller screen sizes increasing the efficiency of liquid/solids separation.
  • a module may be installed as a constituent part of a shale shaker. In this role it reduces the volume of fluid passed to the lower decks of a shale shaker allowing them to handle finer screens and increase separation efficiency. This is particularly so when a module is employed in a modular vibratory screening machine (shale shaker) in accordance with the fifth aspect of the invention.
  • the module can provide the ability to process between two and six times the fluid that can be processed by a single conventional screen deck of similar screen area. Where a module is combined with one lower deck screen conventional screen assembly the capacity of the resulting machine is between three and seven times that of the single deck machine for the same footprint. Equally for a two deck machine with the screens running in parallel the capacity after inclusion of the module as part of the stack of processing levels can be between four and eight times that of the two deck machine for the same footprint.
  • a machine that is substantially smaller in footprint but has a very high screening capacity may be produced.
  • a stack of the following items is provided, in order from the top of the basket: a scalping screen deck; a processing module 1 in accordance with the fourth aspect of the invention; and a further two screen decks, stacked one above the other and provided with a flow distributor to allow series or parallel processing.
  • FIG. 6a shows a weir assembly 20, with a trough 30 and baffle 26 as discussed before.
  • the assembly 20 is provided with at least one inlet 56, shown schematically as a 'V (in this example two are provided) for the injection of fluid (e.g. water or a gas such as air).
  • the point of the 'V indicates the direction of injection of fluid.
  • the inlets are provided to inject fluid into the trough 30.
  • Such inlets or injection ports can be used to aid passage of solids over the weir and/or to generally keep solids 14 well dispersed in the flow.
  • the inlets 56 can also be used to assist in clearance of a blockage should one occur.
  • Figure 6b is a similar arrangement to that of figure 6a except that only one inlet 56 is provided, in this case downwardly directed from the baffle 26 into the trough 30.
  • An effective alternative location for fluid inlets is at one or both ends of the trough 30, with the inlet or inlets directing the injected fluid transverse to the direction of flow of the solids and liquid through the trough and over the weir.
  • Figure 6c shows an arrangement where the weir assembly 20 does not have a trough or a baffle but has a plate 24 at the discharge end 16 of the module.
  • the inlets 56 injects fluid through the plate 24 to aid in carrying solids 14 over the weir and/or clear blockages or build up of solids.
  • a rotating agitator 58 is fitted to the weir assembly 20, to aid transport of solids 14.
  • a conveyor 60 for example a conveyor belt or bucket chain is used aid transport of solids 14.
  • the wall 18 of weir assembly 20 is moveable about pivot 62 from its normal position to the open position indicted by dashed line 64. This allows solids 14 to be released from the assembly 20, without passing over the weir wall 18 as indicated by arrows 66. This may be done only when a blockage occurs or periodically as a routine procedure in normal processing.
  • An alternative means of releasing solids 14 is shown in figure 6g where the weir wall 18 is slideable (upwards) to allow the solids to proceed without passing over the top of wall 18.
  • a downwards slideable weir may be used as an alternative, allowing solids 14 to pass over a reduced height (e.g. zero height with respect to screen 10) wall 18.
  • a conduit 2 is supplied with a liquid and solids feed 6 by means of a pump P.
  • the pump can vary the pressure of feed, adjusting the flow rate through the apparatus.
  • the weir has an outlet in the form of an adjustable orifice 67.
  • the orifice 67 may be adjusted in size, e.g. by means of moveable plates (not shown) that reduce the cross section area of the orifice.
  • the variable orifice affects pressure within the conduit 2 and the flow rates through the apparatus.
  • the use of an adjustable pump P and a variable orifice weir outlet 67 in combination allows good control of the flow rates, but it will be understood that these two features may be used independently.
  • a conduit 2 is illustrated that allows successive screening through two meshes 10 and 10a of increasing fineness.
  • cleaned stream 15 has passed through both meshes 10 and 10a, whilst two concentrated streams 22 and 22a are produced, each being directed from a respective weir orifice outlet 67,67a for recycling, further processing or disposal are desired.
  • the streams 22, 22a may be recombined as they leave the apparatus or dealt with separately, for example if the solids particles in stream 22a are of particular utility. These particles are of a selected size, dependent on the mesh sizes employed in screens 10 and 10a.
  • Successive screening has the additional advantage that coarser screen 10 protects finer screen 10a form damage, leading to a longer life for the finer screen.
  • control system may be fully or partially automated. If used the control system would typically comprise sensors. Suitable sensors may include proximity sensors or density sensors that sense the build up of solids, pressure sensors that sense the plugging of the weir and the consequent increase in pressure due to an increase in fluid head prior to the weir, or any other suitable sensor. The sensor will output to a computer, pic or other suitable device that will actuate the necessary response when the build up of solids is detected.
  • the control system could also be a simple timer mechanism that actuates the mechanism on a regular timed basis.
  • An additional option for apparatus of the invention, in particular modules according to the fourth aspect, is the provision of an interlock, for example as part of the control system mentioned above.
  • the interlock acts between air jets such as shown in figure 6a and discussed above and the starter control for the vibratory screening machine. On start up the air jets are activated to ensure a clear path over the weir at or shortly after the fluid/solids mixture being processed is introduced to the module.
  • a modular vibratory screening machine in accordance with the fifth aspect of the invention is shown in schematic perspective exploded view in figure 7. Not shown on the figure are items such as optional fume extraction that may be fitted to a vibratory screening machine of the invention.
  • the machine includes a base 68 for mounting springs 70.
  • the base 68 has an open bottom 72 to allow filtrate that has been processed by the machine to flow to a sump and/or into e.g. a pipe to a holding tank.
  • the basket of the machine is made up of three screening modules 74, 76, 78 and has a drive assembly 80, of the type typically employed in shale shaker technology to impart vibratory action to a basket.
  • the drive assemblies provide the appropriate vibratory motions for the equipment and materials being processed as is well known in the art.
  • the drive assemblies are adjustable to provide one or more of linear motion, balanced motion, elliptical motion, orbital motion, variable vibration amplitude and variable vibration speed (frequency).
  • the lower screening module 74 is a two deck arrangement including two sets of rails 82, 83 for fitting screen assemblies (not shown) that typically include a screen mesh mounted on a support frame that slides into position on the rails 82 and are clamped and tensioned as required in the known manner for shale shaker screening operations.
  • the module also includes two flowback pans 84, 86.
  • the upper flowback pan 84 is for collecting filtrate from a module above, and directing it to the appropriate end of the screen assembly below (not shown, would be fitted to rails 82).
  • the lower flowback pan 86 typically collects filtrate from a screen assembly fitted to rails 82 and directs it either to an end of a screen assembly fitted to rails 83 or elsewhere (e.g. base bottom 72.
  • the module 74 is thus a typical shale shaker two deck arrangement that can be used for various screening operations including series screening, firstly through a screen fitted to an assembly on rails 82 and then through a screen of assembly fitted to rails 83.
  • Alternative operations can include parallel processing, with a feed being split and directed to screen assemblies fitted to both decks (onto rails 82 and 83).
  • a flow distributor similar to those described in WO/2004/110589 may be included with this module to allow parallel or series processing as desired (not shown in this diagram).
  • the module 74 sits on top of springs 70, mounted on base 68 in use.
  • Module 76 is a module according to the fourth aspect of the present invention, including a (detachable) weir assembly 20, inflatable packer plates 88,90 and a flowback pan to direct feed to inlet end 4 of the conduit 2 within the module.
  • the inflatable packer plates 88,90 are used to retain weir assembly 20 in place and provide fluid sealing.
  • the inflatable packer plates slide through slots in side of module 76.
  • the weir assembly can thus be easily and quickly removed for screen changing, screen inspection, or changing of adjustment of weir.
  • a set of rails 94 are used to fit a screen assembly including a screen (not shown) that functions as the screening portion on the bottom wall of conduit 2 .
  • the screen of module 76 may be removable via a closable slot or port at the end of the module distal to the weir assembly. In either case screens are conveniently held and sealed in place by inflatable tube sealing arrangements as known in the art.
  • Module 76 functions as described above, to divide a feed coming from the module above into two streams, the stream passing over the weir being directed via fiowback pan 84 to the screen decks of module 74.
  • Module 78 is a scalping screen deck in this example, mounting a scalping screen assembly (not shown) on rails 96.
  • the module 78 includes large flanges 98 for mounting drive unit 80, by bolting through its corresponding flanges 100.
  • the modules 74, 76 and 78 are bolted together at flanges 102 to constitute the shale shaker basket.
  • the basket is mounted on base 68 via springs 70 and the drive unit 80 bolted to module 78.
  • Other components such as a feed chute, to direct a feed to the scalping screen are not shown in this example.
  • the basket may also include a standard mounting unit, mounted on the springs to which the processing modules such as 74,76 and 78 may be bolted.
  • the modular shale shaker may be constituted of fewer or different modules as desired.
  • it may include a triple deck module or a single deck module in place of the two deck module 74.
  • the operation of a shale shaker configured as in figure 7 is illustrated in figures 8.
  • a machine not constructed in modules but having the same set of and ordering of screen decks and process module mounted in a basket i.e. in accordance with the sixth aspect of the invention, may operate in the same fashion. However, without the option to change the configuration and number of modules fitted for a processing operation.
  • Figure 8 shows in schematic cross section elevation a modular shale shaker of the type shown in figure 7, in use with various flows indicated by letters A to I.
  • the base unit 68 and springs 70 are not shown in this diagram, for clarity.
  • the screens fitted in the modules are indicated by dashed lines 106,108 and 110.
  • a used drilling mud feed (or other solids and liquids mixture) A is delivered via feed chute 104 onto scalping screen module 78.
  • Solids not passing screen 106 are collected on top of screen 106 and moved by the vibratory action, delivered by drive unit 80, to exit the scalping screen module 78 as flow B.
  • the underflow C (filtrate) from the scalping screen module 78 is delivered to the inlet end 4 of the conduit of module 76 via flowback pan 92.
  • a top wall of the module 76 may itself constitute a flowback pan in other examples of modules of the invention.
  • the module 76 divides flow C into two flows.
  • a cleaned stream (fluid and solids passing through screen 108) exits the machine as flow D, whilst the concentrated stream E passes over the weir of weir assembly 20 and proceeds via a flowback pan to the upper of the two screens 110 in module 74.
  • the module 74 provides series processing through the two screens 110, the lower screen having a finer mesh than the upper, as is typical for shale shaker operations using two screen decks.
  • Parallel processing through two screens 110 of the same mesh size can be operated if desired by dividing flow E into two feeds, one for each screen 110 in the known manner, for example by using a flow distributor such as one of the type described in WO/2004/110589.
  • a flow distributor will be fitted at an end 111 of the basket (see figure 8a).
  • the flow F and flow D are combined in this example by collecting in a tank (indicated by line 112) for return to the drilling mud system as combined flow G.
  • a chute (not shown in this example) may be provided to direct flow D onto a tank or a sump as desired.
  • Solids collected on screens 110 are moved by the vibratory action, delivered by drive unit 80 to all three modules 74, 76, 78, to exit the scalping screen module 74 as flows H and I.
  • FIG 8a shows in schematic detail a flow distributor 122 fitted to the end 111 of module 74.
  • the distributor may be of the type described in WO/2004/110589.
  • the figure illustrates aspects of parallel processing of flow E, rather than the series processing shown in figure 8.
  • Flow E forms a pool or pond, in the usual fashion for an inclined screen operation in a shale shaker, as it collects on the upper of the two screens 110 .
  • flow E is divided into two streams E1 and E2.
  • Stream E2 is the flow that is filtered on the upper screen 110 with the filtrate passing through the screen and then being directed via the corresponding flow back pan and the distributor 122 (detail of path not shown) to the sump of the machine.
  • Stream E1 is the flow from the pond that passes over weir 124 of the flow distributor 122 and is then directed by appropriately set passages onto the lower of screens 110 for filtration.
  • the flow distributor, especially weir 124 is protected by deflecting baffle 126. This ensures that flow E forms the pond first and is then divided by the weir.
  • FIG 8b shows in schematic detail a weir assembly 20 that may for example be used in the arrangement of figure 8.
  • the weir assembly includes a baffle 26 with an adjustable slide portion 128 that can be moved as indicated by the double headed arrow.
  • the baffle 26 is adjustable in height with respect to the trough in this example, allowing adjustment of flow rate and/or pressure.
  • This mechanism can be used to aid in clearing blockages of solids 14 if they occur.
  • Figure 8c shows in schematic partial plan view a modification to the arrangement of figure 8 that can be of general benefit when employed in either a modular shale shaker or an apparatus according to the sixth aspect of the invention.
  • Figure 8c shows in plan the inlet end of the conduit 4 and part of the flow back pan 92 overlaying the screening portion of the conduit.
  • the flow back pan 92 (which may be a top wall of the conduit 2) has at least one passage 93 to allow a portion of the flow to pass downwards into the conduit without passing through inlet end 4. If the conduit has a separate top wall as indicated in figure 8 then passages 93 will continue through that top wall.
  • the passages 93 increase the flow into the screening portion of the conduit 2 and can help to avoid flooding of a processing stage above the conduit 2 caused by insufficient flow through the inlet end 4. At the same time the flow into the conduit via the passages 93 increases flow therein and can aid in avoiding blockages. Furthermore a higher flow rate is obtained without increasing the footprint of the apparatus e.g. by increasing the cross sectional area of the inlet end 4.
  • Advantageously passages 93 are positioned at an edge of the flow back pan 92 running parallel to the general direction of flow as shown in figure 8c. This arrangement tends to prevent the flow passing through the passages 93 from falling directly onto a screen of the screening portion where it may increase wear or cause damage.
  • the flow will tend to run down the sides of the conduit as it mixes with the larger flow from the inlet end 4 and/or will tend to be directed at edges of the screening portion where, typically, screen supports or tensioning devices are located i.e. screening material such as relatively delicate wire meshes are not present.
  • FIG 8d shows in partial schematic detail a modified feed chute 104 and corresponding scalping module 78 similar to that of figure 8 that can be of general benefit when employed in a modular shale shaker, an apparatus according to the sixth aspect of the invention or shale shakers in general.
  • the feed chute 104 is "anti- splash”.
  • the chute 104 is provided with an outlet having an outwardly directed flange 105 which is spaced apart from but cooperates with an inwardly directed flange 105a round the top edge of the module 78 (or round the top edge of the basket of a typical shale shaker arrangement).
  • the flange 105 is inside and below the flange 105a.
  • the two flanges combine to prevent splashes of fluid from flow A as it is processed through scalping screen 106 escaping upwards and outwards.
  • the outlet of chute 104 may be sized so as to extend over the area of screen 106 where fluid, as opposed to screened solids, may be expected to be found when typical or even higher than normal flow conditions through screen 106 are present.
  • the flanges 105,105a are spaced apart to avoid transmitting vibration to the feed chute 104 from the vibratory screening machine.
  • Figures 9a to 9g illustrate schematically in elevation some of the available options when making use of a modular shale shaker apparatus.
  • drive unit 80 springs 70 and a mounting unit 114 (where fitted) are shown in addition to the different modules fitted for each option.
  • a base unit for mounting the springs will be provided (as in part 68 of figure 7).
  • Other items such as the appropriate feed equipment and collection equipment for solids and fluid flows are not shown for clarity.
  • the optional mounting unit 114 provides a base with appropriate ability to connect to springs 70, onto which modules may be bolted to form a basket with the desired functionality.
  • the lowest module used in a given configuration of the apparatus may have suitable connections for fitting to springs 70.
  • a single deck module such as the scalping deck module 78 shown in figure 7 is fitted to a mounting unit 114 on the springs 70. This configuration can screen a solids and liquid feed through a selected mesh size screen.
  • a two deck screening module 116 that may be of the similar form to module 74 of figure 7 is fitted below scalping deck module 78. Series processing through one screen then the next (of finer mesh size) is provided by appropriate flow distribution arrangements.
  • Figure 9c has the same two deck arrangement 116 as in figure 9b but with flow distribution arranged to give parallel processing, simultaneous processing of a feed divided between both screen decks, fitted with screens having the same mesh size.
  • Figure 9d has the same two deck arrangement as in figure 9b but with a flow distributor fitted that allows switching between series and parallel processing. This arrangement can be used to carry out processing as with the apparatus of either figure 9b or figure 9c.
  • Figure 9e shows a triple deck module 118 fitted below scalping deck 78.
  • the triple deck module 118 may be fitted with a flow distributor that can allow various series or parallel operations, including for example parallel through all three screens at once, series through all three screens and through the top screen of the three, followed by parallel processing through the lower two screens.
  • Figure 9f shows an arrangement similar to that of figure 7, with a scalping deck module 68 followed by a module 76 containing a conduit and weir arrangement.
  • the lowest module 120 in the stack may however take the form of any single or multiple deck arrangement discussed above, or may be of some other form, e.g. a four deck arrangement.
  • Figure 9g shows an arrangement having only a module 76 as in figure 7 fitted.
  • a scalping deck arrangement may be fitted above it.

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  • Life Sciences & Earth Sciences (AREA)
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  • Fluid Mechanics (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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Abstract

La présente invention concerne un appareil utilisé pour le tamisage d'une charge constituée d'un mélange de liquide et de matières solides, lequel appareil comprend un conduit (2). Le conduit comporte une partie (8) de tamisage formée et disposée de manière à séparer une charge constituée d'un mélange de liquide et de matières solides s'écoulant dans ledit conduit, sous forme d'un premier courant tamisé (15) contenant du liquide et des particules solides d'une taille inférieure à une taille limite sélectionnée et un second courant concentré (22) contenant du liquide et des particules solides d'une taille supérieure à la taille limite sélectionnée. Un orifice de sortie pour le second courant provenant de la partie de tamisage se présente sous forme d'un ensemble déversoir (20) qui comprend un coude (30) comportant une paroi inférieure disposée à une hauteur inférieure à celle de la paroi inférieure (12) de la partie de tamisage du conduit et un orifice de sortie (18) au-dessus duquel s'écoule le second courant concentré (22). L'invention concerne également un module de traitement (76) comprenant l'appareil et un appareil de tamisage vibrant modulaire comprenant ledit module.
PCT/IB2012/001968 2011-09-02 2012-08-31 Appareil de tamisage vibrant WO2013030667A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1404273.3A GB2507932B (en) 2011-09-02 2012-08-31 Vibratory screening apparatus
NO20140421A NO342325B1 (no) 2011-09-02 2014-04-01 Vibrasjonssileanordning

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB1115212.1 2011-09-02
GBGB1115212.1A GB201115212D0 (en) 2011-09-02 2011-09-02 Vibratory screening apparatus
GB1207292.2 2012-04-26
GBGB1207292.2A GB201207292D0 (en) 2012-04-26 2012-04-26 Vibratory screening apparatus

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WO2018109478A1 (fr) * 2016-12-14 2018-06-21 Axiom Process Limited Système de panier de tamis vibrant
CN115213660A (zh) * 2021-04-20 2022-10-21 广东格兰仕微波生活电器制造有限公司 一种磁极a侧的装配工艺及磁控管阳极组件生产工艺

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WO2004110589A1 (fr) 2003-06-12 2004-12-23 Axiom Process Limited Appareil de criblage
US20080251428A1 (en) * 2003-06-12 2008-10-16 Axiom Process Limited Screening system
US20070131592A1 (en) * 2005-12-13 2007-06-14 Neale Browne Vibratory Separator
US20100089652A1 (en) * 2008-10-10 2010-04-15 National Oilwell Varco Shale Shakers with Selective Series/Parallel Flow Path Conversion

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RU2541675C1 (ru) * 2014-02-11 2015-02-20 Анатолий Иванович КОСТЮК Вибрационное сито высокочастотное для интенсивной очистки бурового раствора и осушки шлама
WO2018109478A1 (fr) * 2016-12-14 2018-06-21 Axiom Process Limited Système de panier de tamis vibrant
CN110248743A (zh) * 2016-12-14 2019-09-17 阿希姆工艺有限公司 页岩振动器筐的系统
AU2017374784B2 (en) * 2016-12-14 2023-04-13 National Oilwell Varco Uk Limited Shale shaker basket system
US11833544B2 (en) 2016-12-14 2023-12-05 Grant Prideco, Inc. Shale shaker basket system
CN107036929A (zh) * 2017-06-14 2017-08-11 中国矿业大学 一种实时测量突水过程中颗粒流失的试验系统及方法
CN115213660A (zh) * 2021-04-20 2022-10-21 广东格兰仕微波生活电器制造有限公司 一种磁极a侧的装配工艺及磁控管阳极组件生产工艺
CN115213660B (zh) * 2021-04-20 2024-01-02 广东格兰仕微波生活电器制造有限公司 一种磁极a侧的装配工艺及磁控管阳极组件生产工艺

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NO342325B1 (no) 2018-05-07
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NO20140421A1 (no) 2014-04-01
GB2507932B (en) 2017-12-13

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