EP0321610B1 - Erdölbohrungssicherheitsventil und Werkzeuge zum Setzen und Zurückziehen eines derartigen Ventils - Google Patents

Erdölbohrungssicherheitsventil und Werkzeuge zum Setzen und Zurückziehen eines derartigen Ventils Download PDF

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Publication number
EP0321610B1
EP0321610B1 EP87202600A EP87202600A EP0321610B1 EP 0321610 B1 EP0321610 B1 EP 0321610B1 EP 87202600 A EP87202600 A EP 87202600A EP 87202600 A EP87202600 A EP 87202600A EP 0321610 B1 EP0321610 B1 EP 0321610B1
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EP
European Patent Office
Prior art keywords
valve
retaining
sleeve
tool
dogs
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP87202600A
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English (en)
French (fr)
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EP0321610A1 (de
Inventor
Jean-Luc Jacob
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MERIP OIL TOOLS INTERNATIONAL SA
Original Assignee
MERIP OIL TOOLS INTERNATIONAL SA
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 to FR868611418A priority Critical patent/FR2602820B1/fr
Priority to CA000519461A priority patent/CA1273288A/fr
Priority to US06/924,438 priority patent/US4729433A/en
Application filed by MERIP OIL TOOLS INTERNATIONAL SA filed Critical MERIP OIL TOOLS INTERNATIONAL SA
Priority to EP87202600A priority patent/EP0321610B1/de
Priority to DE8787202600T priority patent/DE3771339D1/de
Publication of EP0321610A1 publication Critical patent/EP0321610A1/de
Application granted granted Critical
Publication of EP0321610B1 publication Critical patent/EP0321610B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
    • E21B23/0411—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube
    • E21B23/04115—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube using radial pistons
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
    • E21B23/0418—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for locking the tools in landing nipples or recesses
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
    • E21B23/042—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion using a single piston or multiple mechanically interconnected pistons
    • 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
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/05—Flapper valves

Definitions

  • the invention relates to a safety valve intended to be inserted into an oil well production tube in order to ensure its opening or closing.
  • the invention extends to tools and methods of laying and fishing, for the implementation of said valve (See US-A-4,479,539 corresponding to the preamble of the independent claims).
  • the safety valves for oil wells have the function of automatically stopping the production of effluent if an incident occurs at the head of the well or downstream from it. They are hydraulically controlled upon opening from the surface and are closed automatically by means of a powerful return spring as soon as a hydraulic pressure drop, commanded or accidental, occurs. These valves have been the subject of numerous development and improvement studies, and their use has become widespread, in particular in offshore eruptive wells.
  • valves are anchored in a receptacle sleeve housed in the production tube; anchoring is carried out by means of elastic dogs capable of undergoing a radial expansion which cause them to penetrate into an anchoring groove of the receptacle sleeve: these elastic dogs are then locked in their anchoring position by means of a spring which repels a locking ring inside said dogs.
  • dogs elastic and the locking spring of the anchoring system are immersed in the effluent and are subject to the effects of corrosion and deposition of the latter.
  • the present invention proposes to provide an improved safety valve, free from the above-mentioned faults.
  • An object of the invention is in particular to guarantee a correct anchoring of the valve when it is placed in the well.
  • Another objective is to guarantee the satisfactory functioning of said valve on opening and to authorize its anchoring only in the event of complete opening.
  • Another objective is to authorize an easy ascent of the valve in all cases (normal ascent for maintenance operations or emergency ascent in the event of non-operation).
  • Another objective is to provide a valve whose anchoring system does not include any elastic part capable of being subjected to the effects of corrosion or deposition.
  • valve according to the invention is described by assuming it to be in place in an oil well, the terms “top”, “bottom”, “upper”, “lower” referring to this position.
  • said valve is characterized in that its anchoring system is a mechanical system with hydraulic stress, comprising mechanical means for maneuvering and locking the dogs, arranged so as to be subjected to the pressure of the control fluid contained in the aforementioned sealed volume and adapted to repel said dogs radially and lock them in the anchoring groove under the effect of said pressure.
  • the valve body is formed in the upper part by a tubular latch body, composed of two tubular parts assembled in the extension of one another by shear screws making it possible to release them : the lower part contains the dogs, while the upper part has a hanging tool attachment profile at the top.
  • the locking sleeve comprises in its bore a groove for the insertion of retaining dogs equipping said laying tool.
  • Such a valve can be placed in the well by means of the laying tool defined below, which only releases it in the receptacle sleeve, when pressurizing the control fluid, only in the event of '' obtaining a correct anchoring and locking, after complete opening thereof.
  • This installation tool comprises a standard cable descent tool, fitted with fingers for hooking the valve hooking profile, as well as a mandrel for holding the shutter member in the open position; according to the present invention, this tool comprises an insurance device interposed between the standard tool and the mandrel; this assurance device is fixed to the standard tool by a telescopic rod and comprises radially retractable retaining dogs, having a head capable of being inserted in the groove of the locking sleeve of the valve and, opposite , a heel adapted to be housed in the tubular slide of said valve, said retaining dogs being, on the one hand, articulated around median axes urged in the direction of their spacing by elastic means and, on the other hand, stressed by other elastic means tending to spread their heels.
  • the invention extends to a recovery tool allowing the disengagement and the raising of the valve according to the invention.
  • This recovery tool comprises or standard cable lowering tool, equipped with latching fingers for the latching profile of the valve, as well as a mandrel for holding the shutter member in the open position; according to the present invention, this tool comprises a support head interposed between the standard tool and the mandrel, said support head having a lower face capable of coming into contact with the upper end of the valve locking sleeve , in order to be able to push it down during the repechage procedure (detailed below).
  • the safety valve shown by way of example in FIGS. 1 to 4 is intended to equip an oil well production tube provided with a receptacle sleeve 1.
  • this receptacle sleeve is provided with a line d 'arrival of control fluid 1a and an anchoring groove 1b whose edges are in the form of a conical ramp.
  • Said valve can advantageously have the general structure of the improved valve described in patent application FR-A-8 611 418 filed simultaneously by the applicant;
  • this valve comprises a valve body of generally tubular shape, consisting of several tubular parts secured to each other: upper latch body 2, upper seal holder 3 carrying an upper seal 15, tubular spacer 4, ring-nut 5, spring sleeve 6 having an upper heel 6a carrying a lower seal 16, lower sleeve 7, shutter body 8.
  • the seal holder 3 and the spacer 4 are pierced with lights 3a, 4a for the passage of the control fluid coming from the line 1a.
  • a tubular slide 9 able to move longitudinally in the valve body, between a low position (corresponding to the opening) shown in Figure 1 and a high position (corresponding to the closure) shown in Figure 3.
  • This slide is returned to its upper position by a return spring 10 and is hydraulically controlled downwards by the control fluid arriving via line 1a, when the latter is pressurized.
  • the shutter body 8 comprises a movable shutter member, constituted in the example by a valve 11 which is articulated on said body so as to be able to pivot between an open position retracted on the side (FIG. 1) and a closed position where said valve closes the valve body by applying against a seal carried by it (Figure 3).
  • the valve 11 is returned to the closed position by a spring 12 disposed around its axis of articulation.
  • this shutter member known in itself, can be of another type and in particular a ball member in which the shutter is provided by a spherical part able to move longitudinally with a rotation associated, between an open position and a closed position (a spring recalling the ball to the latter position).
  • the slider 9 Under the effect of the hydraulic control, the slider 9 is moved to its low position until it comes into abutment with the valve nose 8a: said slider then pushes the shutter member 11 and maintains it in the position of opening.
  • the return spring 10 When the pressure of the control fluid accidentally or voluntarily drops, the return spring 10 generates a displacement of the slide upwards, up to its high position where it is set back in the lower sleeve 7 (FIG. 3). The shutter member 11 is then released and closes under the action of its own spring 12.
  • the lower sleeve 7 is equipped with a balancing valve 13 which is actuated, during the reopening, at the start of the descent of the slide, by a cam 9a of the latter, in order to allow pressure balancing below and beyond the shutter member 11.
  • the valve is equipped with a mechanical anchoring system with hydraulic stress, which is more particularly the object of the present invention and which essentially comprises the lock body 2, dogs anchor 54, a locking sleeve 55 and a sliding piston 58.
  • the lock body is screwed by a thread 50 on the contiguous section of the valve body (constituted by the upper seal holder 3). Its lower end 51c internally forms a projection intended to serve as a stop for the sliding piston 58 in the high position.
  • This lock body is composed of two tubular parts, lower 51 and upper 52, which are assembled in the extension of one another by shear screws such as 53. These screws are adapted to break beyond d 'a predetermined shear threshold in order to release the two parts 51 and 52 and to allow, as will be seen below, a rise in the valve in the event of faulty operation.
  • the lower part 51 is provided with floating dogs such as 54, which are housed in guide lights thereof.
  • these dogs are four in number distributed around said part.
  • Each dog formed by a die has upper and lower external chamfers, and lower internal chamfers, so as to be able to play radially when the locking sleeve 55 or the receptacle sleeve 1 comes to bear against one of these chamfers.
  • shoulders 54a provided laterally inside each dog, prevent complete exhaust to the outside of each dog by coming into abutment against the part 51 of the lock body.
  • Each dog can thus protrude from the lock body as shown in Figures 2 and 4 (anchoring position) or on the contrary retract therein (as shown in Figures 5 or 6).
  • the lower part 51 of the lock body has a stop shoulder 51a, which is located below and near the dogs 54.
  • This shoulder has the shape of a conical ramp oriented downwards, so as to come into contact of the conical underside 1bi of the anchoring groove 1b when the valve is lowered into the receptacle sleeve 1.
  • the lock body has, above this shoulder 51a, a slightly larger diameter than below the latter, the bore of the receptacle sleeve 1 having conjugate shapes.
  • the lower part 51 of the lock body is internally provided below the level of the dogs, with a hooking shoulder 51b having the shape of a conical ramp oriented downwards. As will be seen below, this shoulder allows the locking sleeve 55 to be hooked to the part 51 in the event of the screws 53 shearing.
  • the upper part 52 of the lock body is provided in the upper part with a hooking profile 52a which, conventionally, allows the valve to be hooked to a fitting tool when it is placed in the tube. of production.
  • This upper part 52 also comprises an internal face 52b which has the form of a conical ramp oriented downwards, adapted to serve as extreme support for the locking sleeve 55 and for transmitting to the part 52 the upward forces experienced by said socket.
  • the upper part 52 finally comprises an internal shoulder 52c which has the shape of a conical ramp oriented upwards, with a view to allowing said upper part 52 to be hooked onto the locking sleeve 55 after the shearing screws 53 have broken.
  • Said locking sleeve 55 is slidably mounted in the lock body with the interposition of a seal 59 at the sleeve / lower part interface 51; it has a peripheral cam 56 which is adapted to push the dogs 54 outward radially when it reaches their level.
  • This cam 56 has an upper face 56a, which has the shape of a conical ramp oriented upwards, so as to be able to repel the dogs 54 when it comes into contact with them.
  • this upper face 56a is adapted to come to the end of its travel in abutment against the internal face 52b of the upper part 52 of the lock body, with a view to the transmission to the latter of the upward forces experienced by the socket 55. .
  • Said locking sleeve 55 is further provided with a hooking shoulder 55a, located below the level of its cam 56 and combined with the hooking shoulder 51b of the part 51 so as to be able to cooperate with the latter in the event of shearing of the screws 53 after disengagement towards the top of the cam 56 relative to the dogs 54: the part 51 is then hooked to the socket 55.
  • the locking sleeve 55 is externally provided in the upper part with a peripheral attachment 57, constituted in the example by a ring screwed around the latter.
  • This ring has a conical lower face 57a, adapted to be able to come into contact with the internal shoulder 52c of the upper part 52 of the lock body, in order to make a hooking of said upper part on said sleeve after rupture of the shear screws. 53.
  • the locking sleeve comprises, in its bore, a circular groove 55b which, when put in place, allows the fitting tool to hold it (thanks to retaining dogs described below, which includes this- this).
  • this groove 55b is formed at the level of the cam 56 so as to take advantage of the conditioned extra thickness by it.
  • the sliding piston 58 which is called upon to move the locking sleeve 55 towards its high anchoring position is formed by a section of tube, adapted to be able to slide in leaktight manner between the valve body (upper part of the door -joint 3) and the upper end of the slide 9.
  • This sliding piston 58 is provided with an internal seal 21 at the slide / piston-sliding interface, and with an external sealing 24 at the piston-sliding / valve body interface; these seals which limit in the upper part the sealed volume containing the control fluid are of different diameters so as to define a surface by which the sliding piston is subjected to the pressure of the control fluid in order to cause its upward movement .
  • the slide 9 intended to push the shutter member 11 towards its open position has a larger external diameter at the lower seal 22 than at the upper seal 21: thanks to this difference in section, this slide is subjected to the pressure of the control fluid which tends to move it downwards and to compress its return spring 10.
  • the control fluid acts first, on the sliding piston 58 to tend to move it upwards from a low position where the latter is in abutment against a shoulder 3b of the seal carrier 3 (FIG. 2) towards an upper position where said sliding piston abuts against the projection 51c formed by the lower end of the part 51 ( Figures 1 and 2).
  • the sliding piston pushes the locking sleeve 55 causing the cam 56 of the latter to radially maneuver the dogs 54 and to lock them.
  • control fluid acts on the slider 9 to tend to move it downwards, from a high closed position (FIG. 3) where a ring-nut 19 (secured to said slider to serve as support for the return spring 10) comes into upper abutment against the heel 6a of the spring jacket, towards a low opening position (FIG. 1) where said slide comes into abutment against the valve nose 8a.
  • Figures 5 and 6 show a valve according to the invention, attached to a setting tool, for its installation in an oil well.
  • This installation tool comprises, in the upper part, a standard cable lowering tool 60, known per se, which conventionally is equipped, on the one hand, with hooking fingers 61, on the other hand, with a lower mandrel 62 (often designated by the term "prong").
  • the fingers 61 make it possible to suspend the valve from the tool by its attachment profile 52a, while the mandrel 62 has the function of keeping the shutter member 11 open during the descent in order to avoid the phenomena of pistoning.
  • the fitting tool according to the invention is provided with an insurance device 63 interposed between the standard tool and the mandrel; this insurance device is fixed to the standard tool by means of a telescopic rod 64 which gives it a capacity for longitudinal translation upwards.
  • the insurance device comprises a central body 65 screwed in the upper part on the telescopic rod 64 and carrying in the lower part the mandrel 62 screwed in a conical tapping thereof.
  • This body 65 has a shape general cylindrical, in which are formed, on the one hand, two opposite millings serving as housing for two retaining dogs 67 described below, on the other hand, two lateral flats 65a to allow the passage of the effluent.
  • This body carries a transverse spring 66 passing through a lumen thereof, a spring at the ends of which the two retaining dogs 67 are articulated. These dogs are thus held elastically by the spring 66 which tends to separate them, each of them being able to pivot around its articulation axis 68. As illustrated in FIG. 7, these axes 68 are guided by slides 65b formed in the body 65 so as to define a position of maximum separation when the axes abut at the bottom slides.
  • Each dog 67 has, in the upper part, a head 67a of a shape adapted to be inserted and snapped into the groove 55b of the locking sleeve 55, as shown in FIG. 6.
  • each dog 67 has in the lower part a heel 67b arranged to be housed in the tubular slide 9 of the valve.
  • another spring 69 is provided between the two dogs to urge their heels in the direction of their separation.
  • the valve being depressurized, its slide 9 is in the high position by the action of the return spring 10; in addition, the sliding piston 58 and the locking sleeve 55 are in the low position, the dogs 54 of the valve being free to fade.
  • the setting tool is introduced into the valve through its upper orifice: its retaining dogs 67a disappear at the level of the locking sleeve 55 by the effect of the spring 66.
  • the retaining dogs 67a reach the level of the groove 55b of this socket, and penetrate and snap into it under the action of the spring 66.
  • the assembly is then lowered in the traditional way into the oil well, until the valve enters the receptacle sleeve 1 thereof (generally located approximately 150 m from the surface).
  • the engagement effort of the seals 15 and 16 is overcome in a conventional manner using a standard slide, hooked above the installation tool to strike it in the manner of a hammer.
  • the dogs 54 of the valve which are floating disappear at the inlet of the receptacle sleeve.
  • the control fluid circuit is then pressurized; the oil enters the sealed volume described above and rises in pressure.
  • the sliding piston 58 of the valve is subjected to an upward force and rises by pushing the locking sleeve 55 to its high position. During its movement, the sleeve operates the dogs 54 and locks them inside the anchoring groove 1b as shown in FIG. 6: the valve is anchored.
  • the slider 9 releases the heels 67b from the tool retaining dogs and, under the action of the spring 69, these dogs pivot around their articulation 68 and their head 67a disappears towards the center as the 'illustrates Figure 8.
  • the locking sleeve 55 is thus released from the installation tool.
  • This fitting tool can then be reassembled in the traditional way (after conventional release of the attachment fingers 61 relative to the attachment profile 52a of the valve).
  • the fitting tool releases the valve by erasing the retaining dogs 67a only when the anchoring thereof is carried out and when it is in the fully open position. Otherwise, the heels 67b of the retaining dogs remain enclosed in the slide, and their head 67a remains engaged in the locking sleeve 55 of the valve.
  • This failure can come from multiple causes: deterioration of the seals 15 and 16 during descent or deterioration of the receptacle sleeve at said seals (preventing pressurization of the sealed volume of valve fluid), deposit due to the effluent in the anchoring groove 1b, (preventing the exit of the dogs 54).
  • the valve is raised, after releasing the fingers 61 of the tool (FIG. 7), by operating percussions upwards by means of the slide.
  • the retaining dogs 67 of the tool remaining attached to the locking sleeve 55 transmit said forces to the said sleeve upwards and bring the upper face 56a of its cam into abutment against the internal face 52b of the upper part 52 of the body lock.
  • the dogs 54 of the valve mechanically pushed outwards, form a fixed point, so that the sliding strokes are reflected on the shear screws 53 which break.
  • the released socket 55 can go up in the lock body until its hooking shoulder 55a abuts against the conjugate shoulder 51b of the part 51 of the lock body as illustrated in FIG. 9.
  • the dogs 54 are released again and the backstage additional cause the valve to rise in the receptacle sleeve 1, with release of the seals 15 and 16.
  • valve once properly anchored in the oil well can be closed in a conventional manner by a voluntary or accidental purging of its hydraulic control line. It then comes into the position of FIG. 3.
  • the return spring 10 has caused an displacement upwards of the slide 9, releasing the shutter member 11 which closes under the action of its own spring 12 aided by the well flow.
  • the reopening of the valve is carried out by putting the hydraulic control line under pressure again: the sliding piston 58 rises against the sleeve 55 and against its stop 51c and the opening occurs as previously explained by displacement of the slide 9 towards the low under the pressure of the control fluid.
  • disengaging and the raising of the valve according to the invention can be carried out by means of or a recovery tool as shown diagrammatically in FIG. 10.
  • This recovery tool comprises in the upper part a standard cable lowering tool 70, identical to the standard tool 60 of the laying tool.
  • This standard tool 70 is equipped, on the one hand, with hooking fingers 71 adapted to cooperate with the hooking profile 52a of the valve, on the other hand, with a lower sleeve 72 ("prong") suitable for keeping open the obturation member 11 of the valve during descent.
  • the recovery tool according to the invention is provided with a support head 73 interposed between the standard tool 70 and the sleeve 72.
  • This head is screwed by a conical thread under the standard tool and carries the mandrel 72 , which is screwed into it by a conical thread.
  • Said head 73 of generally cylindrical shape, has a lower face 73a capable of coming into contact with the upper end of the locking sleeve 55 of the valve.
  • the hydraulic control line being purged, the tool is struck downwards by means of a conventional slide to push the locking sleeve 55 down by the action of the support head 73 and to engage the fingers 71 of the tool in the attachment profile 52a of the valve.
  • the locking sleeve descends until it comes into abutment against the sliding piston 58, itself in abutment against the shoulder 3b of the seal carrier 3: the dogs 54 of the valve are released and can fade towards the interior.
  • Percussion is then generated upwards on the tool which, by means of the hooking fingers 71, causes the seals 15 and 16 to disengage, the valve then being raised to the cable.
  • a backup procedure is then used to carry out the disengagement, using the preceding tool in which the head 73 has been removed (FIG. 11), the mandrel 72 being directly screwed under the standard tool 70. (For this purpose, the thread of the head 73 is identical to that of the standard tool to allow this modification to be carried out).
  • the tool thus modified can be hooked by its fingers 71 on the attachment profile 52a of the valve, even if the sleeve 55 is blocked in the high position. After obtaining this attachment, we tap upwards using the slide until the screws 53 are sheared, as illustrated in FIG. 11.
  • the upper part 52 of the lock body is then released and rises with the tool 70 until its internal shoulder 52c abuts against the upper ring 57 of the locking sleeve 55.
  • This sleeve 55 then moves at its turn upwards until its hooking shoulder 55a abuts against the conjugate shoulder 51b of the lower part 51 of the lock body.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (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)
  • Safety Valves (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)

Claims (10)

  1. Sicherheitsventil zur Einführung in ein Erdölbohrungsförderrohr, um dessen Öffnen bzw. Schließen zu gewährleisten, wobei das besagte Ventil die folgenden Teile umfaßt:
    . einen Ventilkörper von im allgemeinen rohrartiger Form,
    . einen beweglichen Verschlußkörper (11), der im unteren Teil des besagten Körpers gelegen ist und in seiner Schließrichtung gepreßt wird,
    . einen rohrförmigen Schieber (9), der so beschaffen ist, daß er der Länge nach im Inneren des Ventilkörpers gleiten kann, um während seiner Abwärtsbewegung Öffnen des Schließelements zu bewirken,
    . eine in einer ringförmigen Aussparung zwischen dem Schieber und dem Ventilkörper angeordnete Rückholfeder (10), um den besagten Schieber in eine obere, dem geschlossenen Zustand des Schließelements entsprechende Lage zu pressen,
    . Mittel zu hydraulischer Abwärtsverlagerung des Schiebers, umfassend einen Steuerflüssigkeitseingang (38, 4a), der quer durch den Ventilkörper führt, sowie einen dichten Raum zwischen dem Schieber und dem Körper zur Aufnahme der Steuerflüssigkeit, wobei der Schieber einen dem Druck der in dem besagten dichten Raum enthaltenen Flüssigkeit ausgesetzten Querschnittsunterschied aufweist, so daß er, wenn der besagte Raum im Druckzustand ist, durch eine Abwärtskraft beaufschlagt wird,
    . ein im oberen Teil des Ventilkörpers befindliches Verankerungssystem (14), das so beschaffen ist, daß es den besagten ventilkörper in einer in dem Förderrohr sitzenden Hülsenfassung (1) befestigt, wobei das besagte System Halteelemente (54) umfaßt, die radial beweglich sind, um in eine Verankerungsnut (1b) der Hülsenfassung eindringen zu können, sowie einen rohrförmigen Schiebekolben (58), der gleitend in dem Ventilkörper angeordnet und so beschaffen ist, daß er eine dem Steuerflüssigkeitsdruck ausgesetzte Oberfläche aufweist, so daß er von einer Aufwärtskraft beaufschlagt wird, wenn die besagte Steuerflüssigkeit unter Druck steht, und eine Sperrhülse (55), die im Gleichdruck oberhalb des Schiebekolbens angeordnet ist, so daß sie von diesem nach oben geschoben werden kann, wobei die besagte Hülse einen peripheren Nocken (56) besitzt, der so beschaffen ist, daß er die Halteelemente radial zurückschiebt, wenn er in der sogenannten Verankerungslage ihr Niveau erreicht,
    . Dichtungsringe, und zwar einen unteren Dichtungsring (16) und einen oberen (15), die so im Ventilkörper angeordnet sind, daß Abdichtung an der Grenzfläche zwischen dem besagten Ventilkörper und der Fassungshülse unterhalb und oberhalb des Steuerflüssigkeitseingangs gewährleistet ist,
    wobei das besagte Sicherheitsventil dadurch gekennzeichnet ist,
    . daß der Schiebekolben (58) gleitend in dem Ventilkörper angeordnet ist, so daß er sich frei in dem besagten Körper zwischen einer unteren Anschlaglage und einer oberen Anschlaglage verschieben kann, wobei der besagte Kolben nur in Abwesenheit jeder mechanischen Sperrung entlang seiner Bewegungshöhe Flüssigkeitsdrücken ausgesetzt ist,
    . daß Sperrhülse (55) im Zustand des Gleichdrucks unabhängig von dem Schiebeventil gleitend in dem Ventilkörper angeordnet ist, so daß der besagte Schiebekolben auf sie nur einen Aufwärtsdruck ausüben kann, ohne daß es möglich wäre, die besagte Hülse mitzuführen, wenn diese sich in der oberen Verankerungslage befindet,
    . daß der Ventilkörper an seiner peripheren Oberfläche eine Halteschulter (51a) aufweist, die so beschaffen ist, daß sie in der Verankerungslage mit den Haltemitteln (1bi) der Hülsenfassung zusammenarbeitet, wobei der besagte Ventilkörper in seinem unterhalb der besagten Halteschulter befindlichen Abschnitt einen geringeren Durchmesser aufweist, so daß er in die Hülsenfassung eingeführt werden kann, bis seine Halteschulter (51a) an den Haltemitteln (1bi) der besagten Hülsenfassung anschlägt.
  2. Sicherheitsventil nach Anspruch 1, dadurch gekennzeichnet, daß eine Dichtung (59) zwischen Sperrhülse (55) und Ventilkörper (51) eingeschaltet ist, um infolge ihrer Härte Befestigung der besagten Hülse in ihrer Lage zu gewährleisten.
  3. Sicherheitsventil nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet,
    . daß die Dichtungsringe (15,16) unmittelbar oberhalb und unterhalb eines Steuerflüssigkeitseingangs (3a,4a) in dem Ventilkörper angeordnet sind, so daß die besagte Flüssigkeit unmittelbar in das Innere des besagten Ventilkörpers eindringt, und zwar zwischen diesen und Schieber (9),
    . daß der die Steuerflüssigkeit enthaltende abgedichtete Raum völlig zwischen dem besagten Ventilkörper und dem besagten Schieber angeordnet ist,
    . daß der besagte abgedichtete Raum am oberen Ende einerseits durch einen Dichtungsring (24) begrenzt ist, der sich an der Außenfläche des Schiebekolbens (58) an der Grenzfläche zwischen dem Schiebekolben und dem Ventilkörper befindet, und andererseits durch einen Dichtungsring (21), dessen Durchmesser geringer ist als der des erstgenannten Dichtungsrings und der sich an der Innenfläche des Schieberings (58) an der Grenzfläche zwischen dem Schiebekolben und dem Schieber befindet, wobei der besagte Schieber (9) eine Höhe aufweist, die so beschaffen ist, daß der besagte Schiebekolben mindestens teilweise abgedeckt wird, was auch immer die relative Lage dieser Elemente ist.
  4. Sicherheitsventil nach einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, daß Sperrhülse (55) in ihrer Bohrung eine Nut (55b) aufweist, deren Querschnitt so beschaffen ist, daß Halteelemente eines Setzwerkzeugs darin eingeführt werden können.
  5. Sicherheitsventil nach einem der Ansprüche 1, 2, 3 oder 4, bei dem
    . der Ventilkörper im oberen Teil durch einen rohrförmigen Blockierungskörper (51,52) gebildet wird, der an dem anschließenden unteren Abschnitt (3) des besagten Ventilkörpers angeschraubt ist,
    . Schiebekolben (58) in Abwesenheit einer Verstopfung frei gleitend in dem besagten anschließenden unteren Abschnitt (3) angeordnet ist, wobei das untere Ende (51c) des Blockierungskörpers innen einen Vorsprung als Anschlag des Schiebekolbens in der oberen Lage bildet,
    . Sperrhülse (55) frei gleitend in dem Blockierungskörper angeordnet ist, so daß sie an das obere Ende des Schiebekolbens (58) anschließen kann.
  6. Sicherheitsventil nach Anspruch 5, dadurch gekennzeichnet,
    (a) daß der Blockierungskörper aus zwei rohrförmigen Teilen besteht, und zwar einem oberen Teil (52) und einem unteren Teil (51), die in Verlängerung voneinander durch Scherschrauben (53) verbunden sind, so daß sie freigegeben werden können,
    (b) daß der obere Teil (52) des besagten Blockierungskörpers mit den folgenden Teile versehen ist :
    . im oberen Teil, mit einem Profil (52a) für die Anbringung eines Setzwerkzeugs,
    . auf einer niedrigeren Ebene, mit einer Innenschulter(52c),
    . auf einer niedrigeren Ebene mit einer Innenfläche (52b), die so beschaffen ist, daß sie als Stütze für die obere Fläche (56a) des Nockens (56) von Sperrhülse (55) dienen kann, um auf die Sperrhülse ausgeübte Aufwärtskräfte auf den besagten oberen Teil zu übertragen,
    (c) daß der untere Teil (51) des besagten Blockierungskörpers Halteelemente (54) enthält und im Innern, unterhalb der Höhe der besagten Halteelemente, mit einer Halteschulter (51b) versehen ist,
    (d) daß die Sperrhülse mit den folgenden Teilen versehen ist:
    . unterhalb des Niveaus ihres Nockens (56) mit einer Halteschulter (55a), die der Halteschulter (51b) des unteren Teils (51) zugeordnet ist, wobei die besagten Halteschultern so beschaffen sind, daß sie nach Ablösen des Nockens (56) in Aufwärtsrichtung im Verhältnis zu den Halteelementen (54) zusammenarbeiten können, um in dieser Lage Halterung des unteren Teils (51) an Hülse (55) zu bewirken,
    . daß im oberen Teil eine periphere Halterung (57) vorgesehen ist, die so beschaffen ist, daß sie mit der Innenschulter (52c) des oberen Teils (52) in Kontakt kommen kann, um nach Bruch der Scherschrauben (53) Halterung des besagten oberen Teils an der Hülse zu bewirken.
  7. Werkzeug zum Setzen eines Ventils nach den Ansprüchen 4 und 6 gemeinsam, umfassend ein Standardwerkzeug zum Absenken durch Kabel (60) mit Haltefingern (61) des Ventilhalteprofils (52a) sowie einen Dorn (62), dessen Zweck darin besteht, Schließelement (11) in der offenen Lage zu halten, wobei das besagte Setzwerkzeug mit einer zwischen Standardwerkzeug (60) und Dorn (62) angeordneten Sicherheitsvorrichtung (63) ausgestattet ist, und dadurch gekennzeichnet, daß die besagte Sicherheitsvorrichtung durch eine teleskopische Stange (64) mit dem Standardwerkzeug verbunden ist und radial zurückziehbare Halteelemente (67) umfaßt, von denen jedes einen Kopf (67a) hat, der so beschaffen ist, daß er in Nut (55b) der Ventilsperrhülse eindringen und einrasten kann, sowie am entgegengesetzten Ende einen Wulst (67b), der so beschaffen ist, daß er in den rohrförmigen Schieber (9) des besagten Ventils aufgenommen wird, wobei die besagten Halteelemente (67) einerseits um Mittelspindeln (68) schwenkbar sind, wobei sie durch elastische Mittel (66) auseinandergepreßt werden, und andererseits durch andere elastische Mittel (69) beansprucht werden, die die Tendenz haben, ihre Wulste (67b) auseinanderzupressen.
  8. Verfahren zum Positionieren eines Ventils nach den Ansprüchen 4 und 6 mit Hilfe eines Setzwerkzeugs nach Anspruch 7, dadurch gekennzeichnet, daß es darin besteht,
    . daß, während das Ventil druckfrei ist, das Setzwerkzeug in dieses eingeführt wird, bis die Finger (61) des besagten Werkzeugs sich an dem Halteprofil (52a) des Ventils festhaken und ihre Halteelemente (67a) das Niveau der Nut (55b) der Sperrhülse erreichen und in diese eindringen und einrasten,
    . daß die Baugruppe in die Bohrung gesenkt wird, wobei das Setzwerkzeug nach unten gerammt wird, um die Eingriffskraft der Dichtungsringe (15,16) in der Hülsenfassung zu über winden, bis Halteschulter (51a) des Ventils an die Haltemittel (1bi) der Hülsenfassung anschlägt,
    . daß die Steuerflüssigkeit unter Druck gesetzt wird, um Schiebekolben (58) hydraulisch zu verlagern und Sperrhülse (55) bis in ihre obere Verankerungslage zu stoßen, was Sperren der Halteelemente (54) im Innern der Verankerungsnut (1b) und Verankerung des Ventils zur Folge hat,
    . daß die Steuerflüssigkeit so lange mit Druck beaufschlagt wird, bis Schieber (9) sich abwärtsbewegt, so daß das Ventil geöffnet wird und die Halteelemente (67a) des werkzeugs im Verhältnis zu Sperrhülse (55) gelöst werden,
    . daß das Setzwerkzeug nach Lösen der Haltefinger (61) im Verhältnis zu Haltprofil (52a) des Ventils wieder angehoben wird.
  9. Fangwerkzeug zum Lösen der Verankerung und Anheben eines Ventils nach einem der Ansprüche 1 bis 6, umfassend ein Standardwerkzeug zum Absenken durch Kabel (70), das mit Haltefingern (71) des Ventilhalteprofils (52a) ausgestattet ist, sowie einen Dorn (72) zur Befestigung des Schließelements (11) in offener Lage, wobei das besagte Fangwerkzeug dadurch gekennzeichnet ist, daß es einen Stützkopf (73) zwischen Standardwerkzeug (70) und Dorn (72) umfaßt, wobei der besagte Stützkopf eine untere Fläche (73a) aufweist, die so beschaffen ist, daß sie mit dem oberen Ende der Ventilsperrhülse (55) in Kontakt kommt, um diese nach unten pressen zu können.
  10. Verfahren zum Lösen aus der Verankerung und Anheben eines Ventils nach den Ansprüchen 4 und 6 mit Hilfe eines Fangwerkzeugs nach Anspruch 9, dadurch gekennzeichnet, daß es darin besteht,
    . daß nach Entspannung des Steuerflüssigkeitsdruckes das Fangwerkzeug nach unten geschlagen wird, bis es Sperrhülse (55) in ihre untere Lage preßt, in der sie die Schließelemente (54) freigibt, und die Finger (71) des Werkzeugs in Halteprofil (52a) des Ventils eingreifen,
    . daß das Werkzeug danach nach oben geschlagen wird, um Lösung der Halteringe (15, 16) im Verhältnis zu der Hülsenfassung zu bewirken,
    . daß das Werkzeug und das Ventil durch Kabel angehoben werden.
EP87202600A 1986-07-29 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeuge zum Setzen und Zurückziehen eines derartigen Ventils Expired - Lifetime EP0321610B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR868611418A FR2602820B1 (fr) 1986-07-29 1986-07-29 Vanne de securite pour puits petrolier et outils en vue de la mise en oeuvre de ladite vanne
CA000519461A CA1273288A (fr) 1986-07-29 1986-09-30 Vanne de securite pour puits petrolier et outils en vue de la mise en oeuvre de ladite vanne
US06/924,438 US4729433A (en) 1986-07-29 1986-10-29 Safety valve for oil-wells and installation tool for the valve
EP87202600A EP0321610B1 (de) 1986-07-29 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeuge zum Setzen und Zurückziehen eines derartigen Ventils
DE8787202600T DE3771339D1 (de) 1986-07-29 1987-12-22 Erdoelbohrungssicherheitsventil und werkzeuge zum setzen und zurueckziehen eines derartigen ventils.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR868611418A FR2602820B1 (fr) 1986-07-29 1986-07-29 Vanne de securite pour puits petrolier et outils en vue de la mise en oeuvre de ladite vanne
EP87202600A EP0321610B1 (de) 1986-07-29 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeuge zum Setzen und Zurückziehen eines derartigen Ventils

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EP0321610A1 EP0321610A1 (de) 1989-06-28
EP0321610B1 true EP0321610B1 (de) 1991-07-10

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US (1) US4729433A (de)
EP (1) EP0321610B1 (de)
CA (1) CA1273288A (de)
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FR (1) FR2602820B1 (de)

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Also Published As

Publication number Publication date
FR2602820A1 (fr) 1988-02-19
EP0321610A1 (de) 1989-06-28
FR2602820B1 (fr) 1991-11-22
US4729433A (en) 1988-03-08
CA1273288A (fr) 1990-08-28
DE3771339D1 (de) 1991-08-14

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