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WO1993007358A1 - Materiel de mise en circulation - Google Patents

Materiel de mise en circulation Download PDF

Info

Publication number
WO1993007358A1
WO1993007358A1 PCT/NO1992/000157 NO9200157W WO9307358A1 WO 1993007358 A1 WO1993007358 A1 WO 1993007358A1 NO 9200157 W NO9200157 W NO 9200157W WO 9307358 A1 WO9307358 A1 WO 9307358A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
packing
circulation equipment
pipe
circulation
Prior art date
Application number
PCT/NO1992/000157
Other languages
English (en)
Inventor
Dag Eiane
Magne Petter Nilsen
Original Assignee
Wepco As
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
Application filed by Wepco As filed Critical Wepco As
Priority to GB9407790A priority Critical patent/GB2275486B/en
Publication of WO1993007358A1 publication Critical patent/WO1993007358A1/fr

Links

Classifications

    • 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
    • E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
    • 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
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/03—Freeing by flushing

Definitions

  • This invention relates to circulation equipment for purging predrilled oil and gas wells upon the placement of casing and conductor pipes, more particularly a tool suspendable from the topdrive of a derrick during the placement and circulation of casing and conductor pipes.
  • Such pipes may e.g. have dimensions corresponding to an outer diameter of 7 inches or more.
  • the circulation or purge medium may e.g. consist of cement, mud, diesel oil or water.
  • rock pieces and the like will often fall down from the wall defining the bore hole, constituting obstacles whenever casing and conductor pipes are set. This is especially prevailing with deviated and horizontal wells , but occurs likewise with more or less vertical wells wherein pieces of rock, etc. , become stuck to uneven portions of the wall defining the bore hole.
  • Such undesired rock piece accumulations must be purged away in order to clean the bore hole where said pipe is to be set.
  • a purging taking place through the pipe to be set is preferably effected upon the placement of the first external pipe, which may have a length of the order of several hundred meters, e.g. 2000 meters.
  • the individual casing or conductor pipes, respectively, are joined at the drilling platform whenever they are pushed/pressed down into the the formation during an operation designated setting.
  • Prior * art technique comprises screwing of a threaded circulation/purge liquid supply socket onto the casing/ conductor pipe in question.
  • a threaded socket must be screwed onto every individual pipe to be purged through.
  • the screwing/unscrewing operation itself requires two-four men, dependent on rig equipment.
  • a risk for the breaking of the connector of the pipe exists, and problems often arise to loosen the connector of the pipe after use. The method is very time- consuming.
  • the object of the present invention is to remedy defects, disadvantages and application limitations of prior art technique and, thus, provide a circulation equipment/tool of the introductorily defined kind and for the previously defined object wherein the equipmen /tool may be coupled sealingly and easily releasably together with the connector of the casing/coinductor pipe without the use of threads, and wherein the interconnection area opti aly functions as a shock absorber.
  • said object is realized through designing a circulation equipment in accordance with the following main claim preamble such that it exhibits the features comprises by the characterizing part of the main claim.
  • Such a circulation equipment is intended to be mounted below the top drive of the derrick before the setting of casing pipes is started, wherein the circulation equipment is presupposed operated/controlled by the driller from his panel, no manual work being employed.
  • the circulation equipment according to the invention is considered used for purge liquid circulation of such pipes also when said wedging problem is not expected to arise (this contrary to conventional equipment which is presupposed used when said problems acutally have arisen; problems very often due to lacking purging in advance) .
  • the circulation operations enabled by the equipment according to the invention may be incorporated into a running process for the setting of the pipes in question, thereby securing a better continuity than conventional equipment allows.
  • the circulation equipment/tool according to the invention is designed especially with a view of excluding a leakage of circulation medium and purge liquid to the environment.
  • Figures 1 and 2 half in side view/half in axial section show a circulation equipment according to the invention, broken lines being inserted, in that the views are not representative with regard to the axial length of the equipment (broken-away portions between said broken lines have, however, the same cross-sectional shape as the portions at the opposite side of the broken lines), in that Figure 1 shows the equipment in a position of readiness in relation to a coaxially below positioned casing/conductor pipe, i.e. in an inactive position prior to the establishment of the interconnection with the pipe, .while
  • Figure 2 shows the same equipment and pipe as in figure 1, yet with the equipment fluid-sealingly coupled to the top connector portion of the pipe;
  • Figure 3 and 4 show, on a larger scale, the lower portion of the equipment according to figures 1 and 2, the coupling head of the equipment occupying the same position as in figure 1 and figure 2, respectively.
  • the sleeve- or socket-shaped connector 1 the cross-sectional shape thereof appearing from the right half of figures 1 and 2 and which is not critical for the function of the connector 1, provided that it is connectable to the top drive of the derrick (not shown), involves the advantage through its design as separate part that the thread wearing then is limited to the connector 1 itself, which is easily replaceable, instead of propagating to more bulky parts of the circulation equipment/tool, causing more comprehensive replacement operations.
  • the lower, internally threaded portion of the connector 1 is screwed onto external threads on the upper portion of an axially extending pipe 2 incorporated into a hydraulic double-acting telescopic cylinder 2,2 ',3 which, besides the pipe 2, comprises an inner pipe 2 ' concentrical and fixedly attached to the former, said concentrical pipes 2,2' defining therebetween an annulus for the displaceable accommodation of a third pipe 3.
  • Reference numeral 4 denotes a locking screw for the connector 1.
  • the hydraulic double-acting telescopic cylinder 2,2 ',3 serves to enable a restricted, defined extension/shortening of the axial extent of the circulation equipment/tool.
  • Ports 5 and 6 serve as outlet and inlet, respectively, for pressure oil whenever the telescopic cylinder 2, 2 ',3 is extended, i.e, when the axially displacable pipe 3 is lowered from the position of figures 1 and 3 into the position shown in figures 2 and 4, and which exchange their functions when the pipe 3 is pulled upwards from the position shown in figures 2 and 4 into the position shown in figures 1 and 3, i.e. that the port 5 acts as inlet for pressure oil at the latter pipe displacement, the port 6 then acting as outlet for pressure oil.
  • a locking device 7 In order to retain the axially displaceable pipe 3 of the hydraulic double-acting telescopic cylinder 2,2 ',3 in the two extreme positions of the latter, i.e. at maximum length and at minimum length, a locking device 7 has been arranged at an appropriate place with respect to the length of the displaceable pipe 3, said lacking device 7 exhibiting any suitable construction and function, provided that it is capable of locking the pipe 3 of the telescopic cylinder in each extreme position in such a way that the locking function may be released rapidly.
  • the locking device 7 comprises a housing formed with e.g. four radial cylindres 7', distributed with an angular displacement of 90 around the axis 1' of the circulation equipment.
  • Each cylinder 7' accommodates a locking piston 8 positioned between the ends of a piston rod, one part 9 thereof being guided in respective cylinder's 7' gable wall, the other piston rod part 9' constituting the actual locking means, adapted to engage lockingly into one (at a time) of two concentrical circumferential grooves 10,11 formed into the displaceable pipe 3 of the telescopic cylinder 2, 2 ' ,3 and spaced axially, determining the axial extension/shortening of the telescopic cylinder 2 , 2 ' , 3.
  • the locking parts 9' of the locking pistons 8,9,9' are in engagement with the lower circumferential groove 10 of the pipe 3, corresponding to contracted telescoopic cylinder, said locking parts 9' in figure 2 being in engagement with the upper circumferential groove 11 of the pipe 3, corresoponding to extended telescopic cylinder.
  • the housing of the locking device 7 wherein the cylinders 7' are formed is provided with pressure oil ports 12 and 13 incorporated into a conventional hydraulic circuitry (not shown).
  • the locking device can only be released by means of control hydraulics, which represents in per se known technique with hydraulic locking devices .
  • purge ports 14 have been formed into the pipe 3.
  • Said purging of the inner parts of the telescopic cylinder is effected by a driller and is performed periodically and subsequent to circulating corrosive medium or mud/concrete.
  • the elongated, tubular through-going bore of the circulation equipment/tool for the passage of circulation/purge ediurr has, generally, been denoted by the reference numeral 15. It should be clear without saying that this bore 15 which is through-going from one axial end of the equipment/tool to the other, is built up through smaller, aligned axial bores of the individual parts of which the equipment/tool is composed and which, generally, are screwed together.
  • the axially displaceable pipe 3 of the hydraulic double-acting telescopic cylinder 2, 2',3 has at the lower end thereof been screwed onto an extension or intermediate piece 16, a locking screw securing the interconnection between the pipe 3 and the intermediate piece being denotec at 16' .
  • Another locking screw 17 serves to secure the establishment of the screw connection between the intermediate piece 16 and an end sleeve 18, which approximately extends down to the extreme end ( the lower end) of a coupling head of the circulation equipment, said coupling head generally being denoted 19 and which is formed for fluid-sealed interconnection to a coupling portion of e casing/conductor pipe; an interconnection to be described further later on.
  • the sleeve is surrounded by a guiding jacket 19 ',19", which is attached to the sleeve 18 by means of a locking nut 20 having a locking or safety screw 20' .
  • the guiding jacket 19 r ,19" has a substantially L-shaped cross section, comprising an axial portion and a radial portion, denoted 19' and 19", respectively.
  • the guiding jacket 19' ,19" has been formed with a radially directed inspection window 19' 1 ', through which one visually may observe the upper edge of the coupling portion of e.g. a casing to be circulated/purged in connection with setting.
  • First annulus 24 is radially defined between opposing mantle surfaces of end sleeve 18 and cylinder ring 21 and axially between a shoulder surface 18' at a flange portion of the end sleeve 18 and an opposing, upper gable surface 26' of a sleeve-shaped packing-actuating means 26, i.e. a means adapted to actuate the packing element 22 which is retained by the cylinder ring 21.
  • the packing-actuating sleeve 26 is formed with an outwardly conically tapering portion 26" which, in the embodiment shown, is constituted by the mantle surface of a conical ring body 26' ' ' screwed onto the sleeve 26, but the former might as well be formed integrally with the latter. Therefore, these two parts are given similar reference numerals .
  • the packing-actuating sleeve 26 is axially displaceably supported in an annulus radially defined between opposing mantle surfaces of end sleeve 18- and cylinder ring 21 and wherein said first and second annulus 24,25 are incorporated, the maximum axial displacement distance of the packing-actuating sleeve 26 being restricted by the above- mentioned shoulder portion 18' of the end sleeve 18 and the upper gable surface 26' of the actuating sleeve 26, and by a downwardly facing shoulder surface (no reference numeral) of the actuating sleeve 26 and an opposing shoulder surface 21" of the cylinder ring 21, see figure 4.
  • the upper edge 29" of the pipe's 29 coupling piece 29' may be observed through the inspection window 19 ' ' r of the guide jacket 19", 19", in order to secure that the position of the packing element 22 in relation to the pipe end 29" is brought to occupy the desired level.
  • the packing element 22 has the form of a freely suspended ring having a lower end surface 22 ' sloping complementarily to the slope of the upwardly conically tapering packing-actuating portion/surface 26" of the axially displaceable packing-actuating sleeve 26, against which the "free" end surface 22' of the packing element 22 rests supportingly in an inactive position of readiness, ready to be activated by means o.f the actuating portion 26", figure 3.
  • the mantle surface of the packing element 22 is withdrawn radially internally of the largest radial extent of the guide head jacket 28 and will, thus, not interfere with the coupling piece 29' of the pipe 29 upon the insertion of the tool head 19 therein.
  • the pressure within the lower casing is to be bled off.
  • the pressure relief takes place in that the pressure is bled off via a channel 33 in the guide jacket 19 ',19" and in the cylinder ring 21 and a channel 33' in the packing- actuating sleeve 26-26' ' ' .
  • the reference numerals 34-36 denote an adjustable pressure relief valve, a manometer and a stop valve, respectively.
  • valve 37 Centrally within the lower bore portion of the end sleeve 18, a non-return valve has been mounted, the valve generally being denoted 37 and the individual components thereof appearing best from figure 3, wherein they are given reference numerals, said numerals being deleted from the other figures, partly due to small scale, partly due to unco plete representation in figure 4.
  • non-return valve 37 which is kept in place within the lower bore portion of the end sleeve 18 by means of a locking ring 38. Upon removal of the locking ring 38, the entire valve 37 may be removed.
  • the valve housing has been denoted 39 and has a central, axially through-going opening.
  • the valve housing consists of two opposite oriented valve cones 40,40' screwed together by means of a screw 41. Between the valve cones 40,40' , an annular packing 42 is clamped.
  • the valve spindle 43 is guided in a sleeve 44, and between the valve body 40,40' and a flange on the guide sleeve 44, a pressure spring in the form of an ordinary screw spring 45 has been tensioned.
  • Said guide sleeve flange is formed with axially through-going apertures 46.
  • a locking ring 47 locks the guide sleeve 44 to the valve housing 39.
  • Guide means for the upper valve cone 40 of the valve body 40,40', at the upper end of the valve housing 39, have been denoted 48.
  • the task of the non-return valve 37 is to close the liguid flow through the circulation equipment when it has been detached from the casing/conductor pipe and to prevent air/ liguid from penetrating into the circulation equipment and further into the top drive.
  • the tool head 19 of the circulation equipment can be exchanged by loosening the locking screw 17 and thereafter neutralize the screwing between the end sleeve 18 and the intermediate piece 16.
  • a purge medium may be conducted into the annulus 49 defined by the inner and intermediate pipes 2 ' ,3 of the hydraulic double-acting telescopic cylinder 2, 2 ',3, in order to keep the mantle surfaces clean so that an unhampered displacement possibility of the pipe 3 in relation to the concentrical stationary pipes 2,2' is secured.
  • the circulation equipment according to the invention comprises a number of individual parts, the function of which substantially should have appeared from the preceding description of the construction, of the equipment. Some of these functions are repeated briefly in the following in connection with a statement concerning the mode of operation of the circulation equipment as a whole:
  • the tool head 19 of the circulation equipment is guided centrally into the coupling piece 29 ' of the pipe 29 in a shock- absorbing way through the rubber-elastic cover 28 of the guide head 27, the annulus 32 between the cylinder ring 21 and the guide jacket 19 ' " ,19" accommodating the mantle of the pipe coupling piece 29' .
  • the upper edge 29" of the pipe coupling piece 29' may be observed visually through the window 20 of the guide jacket 19.', 19".
  • the tool head 19 ofthe circulation equipment will take the position shown in figures 2 and 4 in relation to the coupling piece 29' of the casing 29, whilst the packing element 22 and the packing-actuating sleeve 26-26' ' ' - for the sake of the continued statement - is presupposed to take the position shown in figures 1 and 3, i.e. with the packing element 22 in non-expanded condition and the packing- actuating sleeve 26-26' ' ' in non-activated position.
  • the packing-actuating sleeve 26-26' ' ' is activated, i. e. displaced upwardly, the packinq-retaininq cylinder ring 21 remaining stationary, whereby the upwardly conically . tapering actuating portion 26" of the packing-actuating sleeve - while resting cooperatively against the opposing end surface 22' of the packing element 22 - urges the packing element 22 radially outwards over the entire circumference, so that it at a circumferential portion rests itself sealingly ( fluid-tight ) against the inner mantle surface of the ' pipe coupling piece.
  • the packing element 22 is made from a material having elastic resilent properties.
  • the nature of the material should in most operations be such that a withdrawal towards the outgoing position, figure 1 and 3, is secured as soon as the radially outwardly directed pressure from the surface 26" of the actuating sleeve 26 ceases.
  • often a loose, frictiondetermined engagement between the walls defining the circumferential groove 21' and the attachment portion 22' of the packing element 22 would be preferred.
  • the intentional sealing interconnection between circulation equipment and casing/conductor pipe 29 has been established, and the circulation of e.g. concrete, mud, diesel oil or water may be started»
  • the spring-loaded 45 non-return valve 37 will secure that the circulation/ purge medium conlciine ⁇ within the circulation equipment does not leak out, but rather remains contained within the axial bore 15 of the equipment.
  • the tool head 19 of the circulation equipment is pulled up and away from the coupling piece 29' of the casing/conductor pipe 29 in that the displaceable pipe 3 of the hydraulic telescopic cylinder 2,2' ,3 is pushed back to the position of readiness shown in figure 1, more particularly after neutralizing the locking at 9 ',11, the pipe 3 of the telescopic cylinder thereafter being locked in a new position at 9 ',10, corresponding to the contracted or shortened condition of the telescopic cylinder 2, 2 ',3.
  • the inner parts of the telescopic cylinder 2,2',3 may be cleaned in extended as well as in contracted condition. Cleaning/purging may take place by means of fresh water, diesel oil or the like.
  • Purge ports 14 (one is visible in figure 1) can " be brought to register with ports of a manifold (not shown) which is coupled to a purge hose upon cleaning.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Glass Compositions (AREA)

Abstract

Appareil de mise en circulation servant à purger les puits de pétrole et de gaz forés préalablement lors de la pose de tubages et de tubes conducteurs. L'appareil peut être adapté pour être suspendu à la transmission supérieure d'un derrick. Ainsi, on peut former, sans utiliser de filetages, une interconnexion étanche et désenclenchable sans difficulté entre l'appareil de mise en circulation et le tubage/tube conducteur (29) à purger lors de la pose. Ledit appareil est constitué d'un tube allongé traversé par un perçage (15) et son extrémité inférieure (par rapport à la position d'utilisation) porte une tête d'outil (19) présentant un anneau (32) dont l'ouverture est tournée vers le bas, destiné à recevoir la pièce d'accouplement (29') dudit tubage/tube conducteur (29), ainsi qu'une garniture radialement dilatable (22) située au voisinage dudit anneau (32) et destinée, lorsqu'elle est à l'état dilaté, à venir se plaquer de manière étanche contre la surface intérieure de la pièce (29') d'accouplement de tubes à l'intérieur de l'anneau (32).
PCT/NO1992/000157 1991-09-30 1992-09-22 Materiel de mise en circulation WO1993007358A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9407790A GB2275486B (en) 1991-09-30 1992-09-22 Circulation equipment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO913823 1991-09-30
NO913823A NO173750C (no) 1991-09-30 1991-09-30 Sirkulasjonsutstyr

Publications (1)

Publication Number Publication Date
WO1993007358A1 true WO1993007358A1 (fr) 1993-04-15

Family

ID=19894496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1992/000157 WO1993007358A1 (fr) 1991-09-30 1992-09-22 Materiel de mise en circulation

Country Status (4)

Country Link
AU (1) AU2754092A (fr)
GB (1) GB2275486B (fr)
NO (1) NO173750C (fr)
WO (1) WO1993007358A1 (fr)

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NO173750B (no) 1993-10-18
GB2275486A (en) 1994-08-31
NO913823L (no) 1993-03-31
GB9407790D0 (en) 1994-06-29
NO173750C (no) 1994-01-26
GB2275486B (en) 1995-02-08
AU2754092A (en) 1993-05-03
NO913823D0 (no) 1991-09-30

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