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WO1993019279A1 - Prehenseur d'urgence pour appareil tendeur de colonne montante - Google Patents

Prehenseur d'urgence pour appareil tendeur de colonne montante Download PDF

Info

Publication number
WO1993019279A1
WO1993019279A1 PCT/NO1992/000049 NO9200049W WO9319279A1 WO 1993019279 A1 WO1993019279 A1 WO 1993019279A1 NO 9200049 W NO9200049 W NO 9200049W WO 9319279 A1 WO9319279 A1 WO 9319279A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
ring
catcher
tensioner
cylinders
Prior art date
Application number
PCT/NO1992/000049
Other languages
English (en)
Inventor
Bryan V. Butler
Original Assignee
Pm Engineering Norway A.S.
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 Pm Engineering Norway A.S. filed Critical Pm Engineering Norway A.S.
Priority to AU16580/92A priority Critical patent/AU1658092A/en
Priority to PCT/NO1992/000049 priority patent/WO1993019279A1/fr
Publication of WO1993019279A1 publication Critical patent/WO1993019279A1/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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
    • E21B19/006—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform including heave compensators
    • 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
    • E21B40/00—Tubing catchers, automatically arresting the fall of oil-well tubing
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • E21B19/06—Elevators, i.e. rod- or tube-gripping devices
    • 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
    • E21B35/00—Methods or apparatus for preventing or extinguishing fires

Definitions

  • the present invention is related to an emergenc catcher for a riser pipe tensioner apparatus according to th preamble of the claims.
  • hydro-pneumatic rise tensioners are generally employed. These traditionally hav 5 consisted of a frame, with multiple (usually four) hydrauli cylinders connected to the frame of the tensioner and thei cylinder rods connected to the riser pipe at the tensioner ring. The frame of the tensioner is supported at four points in th main deck structure of the platform. o During normal operation the four cylinder rods strok in and out in response to the movements between the riser pip and the platform. Tension is maintained by pressure in eac cylinder, and fluid from the cylinder can move back and fort into a connected chamber, called an accumulator. Each pair o 5 accumulators and cylinders becomes a gas spring, maintainin tension on the riser while the cylinders stroke.
  • the riser may b pulling at an appreciable angle from vertical, and be located of centre with respect to the four cylinders. This causes uneve reaction loads in the tensioner frame and in the support brackets of the platform deck.
  • one or more cylinders can be inoperative, in which case the support of the riser is placed on the remaining cylinders of the riser tensioner, again causing uneven load reactions on its supports.
  • the designer of the platform must consider that both events - lost cylinders and extreme riser movements - can occur together, and design in sufficient support strength at the reaction points in order to maintain sufficient margin of safety.
  • At least four cylinders are used in each tensioner t provide redundancy in the event one is out of service tempora ⁇ rily. This condition results in the reaction loads increasing o 5 the support pads of the tensioner frame. Should two cylinder become unserviceable, the loading is increased even further. Finally, in the event three cylinders are lost, all the load i carried by one cylinder. This latter case is not expected t occur under any of the normal operating conditions but could b o the case during an emergency such as a fire or explosion.
  • Both methods are increasing the safe operating margi for the platform under extreme conditions and are commonly used 5 -to gain one objective, namely to extend the time that th structure can withstand exposure to a major, potential catastrop ⁇ hic fire.
  • Tension is required to maintain the riser in a vertical attitude, even as the vessel heaves and moves about. This is done 5 with a riser tensioner using four hydraulically pressured cylinders, the rods of which being attached to a connecting collar on the riser, known as the riser tensioner ring.
  • Wave and current action on the riser cause it to move about, swinging through a small vertical angle or cone.
  • the o pressured cylinder rods compensate for this by stroking in and out, maintaining the required tension and sharing the load, more or less equally.
  • fire jackets and other insulative measures along with deluge or other active fire o suppressant systems are employed.
  • the main objective is to protect the structures against excessive heat, which will cause them to bend and break apart as their load carrying capacity reduces.
  • the present invention secures the riser in case of a s total cylinder failure, with the apparatus described by the features stated in the claims.
  • the principle relies on the idea of allowing the support structure connected to two articulating support struts, such as two cylinders or cables or chains, to rotate about a o centre point.
  • the centre point is used to carry the riser tensioning load.
  • the support structure rotates so that both struts, cables, or other structural supports continue to share the load, more or less equally. It is similar in action to that of the well known porch seat swing, where four s parallel chains are suspending the swing. As it moves, the swing rotates to maintain loads on all four chains. The rotation action also helps keep the occupants seated in the swing.
  • This disclosure points out the important principle of allowing the connecting structure between the load carrying 0 points and the point where the main load is supported to rotate with respect to their normal axes when at stationary equilibrium in order to maintain significant load sharing between more than one load supports.
  • the same principle can be extended to more than two 5 supports by a support structure allowing rotation between any pair of supports, in any azimuth.
  • Cylinder loads are carried into each of the legs of the frame by a pin or a shackle located on the leg.
  • the tendency of 5 the upper end of each leg to rotate downward is resisted by the toroidal section modules of the centre ring member.
  • the stresses are distributed to the other legs, so that each leg is involved in sharing loads generated by the other legs, no matter which legs are actually being pulled on by cylin- ders .
  • the frame also lends itself to enhancing the use of passive fire protection, as the surfaces to be protected are easy to envelope, and the load stresses are distributed rather than concentrated. Lower stresses mean that the frame is more resistant to deformation when subjected to excessive heat as would be the case in a fire.
  • the present invention is directed to a secondary support, operational in cases where the tensioner cylinders of which ever reason are inoperative, thereby maintaining the riser pipe tension necessary. This is achieved with the support according to the present invention as defined by the features disclosed in the claims.
  • Catcher Ring a secondary support, located around the riser, below the riser tensioner ring at an elevation that will support the riser before the cylinders stroke completely out. This ring is attached at two points to links that are connected back into the deck frame.
  • the catcher ring is specially shaped to allow it to support the riser tensioner ring at two points 180 degrees apart, but can rotate vertically about an imaginary axis through these two support points.
  • the two support links are attached 90 degrees out of phase with the two tension ring support points.
  • This configuration allows the riser to swing about, through a vertical angle (as acted on by winds, waves and currents). Within this range of motion, the catcher ring can rotate on its two support points, continuously sharing its tension load between the two support links.
  • Figure 1 schematically discloses an over all side view of a riser tensioner
  • Figure 2 discloses the catcher device according to the present invention in a position corresponding with Figure 1 with the riser in a vertical position
  • Figure 3 corresponds with Figure 2, however with the riser in an angle in relation to the o vertical
  • Figure 4 shows a ground view of a tensioner with a catcher ring according to the present invention
  • Figures 5 and 6 disclose a side view and a top view respectively of the catcher ring.
  • a riser pipe 1 is tensioned 5 by cylinders 2 and cylinder rods 7 connected respectively to a platform deck via a toroidal, ring 3 and the riser pipe 1 via a ring bracket 4.
  • the platform or floating structure may be displaced due to current or weather conditions, resulting in an angle or the riser pipe in relation to the vertical, which is disclosed in Fig. 3.
  • the tensioner maintains the tension of the riser even in this situation as hydraulic fluid is transferred between the cylinder 2 and the corresponding accumulator which is maintaining a desired pressure on the fluid by means of a s pressurized gas portion within the accumulator.
  • the tensioner is covered by insulation as is obvious from Fig. 1, an insulation covering the cylinder rod 7 and telescoping the insulation covering the cylinder itself. Said insulation is protecting the cylinders and the cylinder rods in o cases of fire, thereby delaying the time, during a fire, that the cylinder and/or the cylinder rod has a temperature which means a substantial decrease of the strength. It is, however, obvious that there may occur situations where this point will be reached and the tensioners no longer will be able to hold the riser. s In such cases it is of essential importance that the riser is captured before it falls down as the strength of the tensioners " decreases.
  • Figures 2 and 3 disclose one embodiment of the present invention, a catcher ring which holds the riser pipe in cases 0 where the strength of the tensioners has been lost due to fire or failure.
  • Figures 5 and 6 disclose another embodiment of the catcher according to the present invention.
  • the inventive catcher comprises a bracket connection to the platform structure arranged diametrically on each side of the 5 riser and being connected with a shock absorber 6 of which one part is connected with the bracket and another part is spring biased within the shock absorber and being at the other end connected with a catcher ring 8, such as disclosed in Figures 2 and 3.
  • the securement of the tensioner cylinder rods 7 to the o riser 1 is made by " means of a tensioner ring (4) which is threaded to the riser 1.
  • the underside of the tensioner ring 4 may have a conical shape as disclosed in Figures 2 and 3, whereby the catcher ring 8 has a corresponding shape in such a way that the tensioner ring 4 may rest on the catcher ring 8, the both s parts abutting each other on a circle.
  • Figures 5 and 6 disclose another embodiment where the tensioner ring 4 rests on a catcher ring 8 by a cam 9 resting in a recess 10 on the catcher ring 8.
  • the load is transferred through diametrically arranged points on the catcher ring.
  • the catcher ring 8 comprises an elliptical opening, thereby enabling the catcher ring 8 to assume different angles in relation to the riser 1.
  • the brackets for the catcher ring are arranged diametrically.

Landscapes

  • 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)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)

Abstract

L'invention concerne un préhenseur d'urgence conçu pour un tendeur de tuyaux de colonne montante entre le fond de la mer et une structure flottante, telle qu'une plateforme avec pieds sous tension, comprenant au moins trois vérins hydrauliques reliant le tuyau de colonne montante avec le pont d'une structure flottante. Le préhenseur comprend deux supports disposés diamétralement opposés par rapport à la colonne montante qui sont reliés, grâce à des amortisseurs de chocs interconnectés, à un anneau préhenseur disposé autour de la colonne montante à une courte distance sous l'anneau tendeur; l'anneau préhenseur est ainsi conçu pour recevoir l'anneau tendeur en cas de défaillance des tendeurs et maintenir ainsi la colonne montante essentiellement dans sa position.
PCT/NO1992/000049 1992-03-26 1992-03-26 Prehenseur d'urgence pour appareil tendeur de colonne montante WO1993019279A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU16580/92A AU1658092A (en) 1992-03-26 1992-03-26 Emergency catcher for a riser tensioning apparatus
PCT/NO1992/000049 WO1993019279A1 (fr) 1992-03-26 1992-03-26 Prehenseur d'urgence pour appareil tendeur de colonne montante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NO1992/000049 WO1993019279A1 (fr) 1992-03-26 1992-03-26 Prehenseur d'urgence pour appareil tendeur de colonne montante

Publications (1)

Publication Number Publication Date
WO1993019279A1 true WO1993019279A1 (fr) 1993-09-30

Family

ID=19907681

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1992/000049 WO1993019279A1 (fr) 1992-03-26 1992-03-26 Prehenseur d'urgence pour appareil tendeur de colonne montante

Country Status (2)

Country Link
AU (1) AU1658092A (fr)
WO (1) WO1993019279A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7337885B2 (en) 2004-12-28 2008-03-04 Smc Corporation Of America Telescoping cylinder

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2817842B2 (de) * 1977-04-23 1980-03-27 Brown Brothers & Co. Ltd., Edinburgh (Ver. Koenigreich) Spannvorrichtung für das Steigrohr einer ölplattform
DE2625520C2 (de) * 1975-06-09 1986-06-05 Regan Offshore International, Inc., Torrance, Calif. Stützeinrichtung für eine Steigleitung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625520C2 (de) * 1975-06-09 1986-06-05 Regan Offshore International, Inc., Torrance, Calif. Stützeinrichtung für eine Steigleitung
DE2817842B2 (de) * 1977-04-23 1980-03-27 Brown Brothers & Co. Ltd., Edinburgh (Ver. Koenigreich) Spannvorrichtung für das Steigrohr einer ölplattform

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7337885B2 (en) 2004-12-28 2008-03-04 Smc Corporation Of America Telescoping cylinder

Also Published As

Publication number Publication date
AU1658092A (en) 1993-10-21

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