EP0267638B1 - Oil well safety valve adapted to artificial lifting - Google Patents

Oil well safety valve adapted to artificial lifting Download PDF

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Publication number
EP0267638B1
EP0267638B1 EP87201966A EP87201966A EP0267638B1 EP 0267638 B1 EP0267638 B1 EP 0267638B1 EP 87201966 A EP87201966 A EP 87201966A EP 87201966 A EP87201966 A EP 87201966A EP 0267638 B1 EP0267638 B1 EP 0267638B1
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EP
European Patent Office
Prior art keywords
aforesaid
slide
sleeve
valve body
valve
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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
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EP87201966A
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German (de)
French (fr)
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EP0267638A1 (en
Inventor
Eric Couste
Jean-Luc Jacob
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MERIP OIL TOOLS INTERNATIONAL SA
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MERIP OIL TOOLS INTERNATIONAL SA
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Publication of EP0267638A1 publication Critical patent/EP0267638A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids

Definitions

  • the invention relates to a safety valve intended to be inserted into an oil well production tube in order to ensure opening or closing, while allowing operation in artificial flow by injection of a pressurized fluid, says injected fluid.
  • 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.
  • these valves are anchored in a receptacle sleeve housed in the production tube; anchoring is carried out by means of a system of mechanical dogs capable of undergoing a radial displacement which cause them to enter an anchoring groove of the receptacle sleeve: these dogs are then locked in their anchoring position by means of a spring which pushes a locking ring inside said dogs.
  • these dogs When these dogs are correctly positioned and locked, they provide an anchorage benefiting from good qualities of mechanical resistance.
  • a pressurized fluid generally a gas
  • the known valves are not suitable for this injection, in particular because the anchoring dogs and their locking system have too large a radial bulk to allow the passage of an internal injection tube of sufficient diameter.
  • FR patent No. 0 2,536,783 and its certificate of addition No. 0 2,555,246 have a valve structure modified with respect to traditional valves; in this new valve, the locking is achieved by means of an elastic ring which is held radially retracted by a system of collar and keys when the valve is lowered and which is released at the end of the descent when the ring reaches the level of the anchoring groove of the receptacle sleeve.
  • This system allows the installation of an internal gas injection tube, but has the very serious defect of being extremely fragile: the elastic ring breaks very frequently either during the installation of the valve, or during of its unlocking, and each break causes very serious practical difficulties of repair and significant risks for personnel.
  • the installation is carried out blind, without guarantee of correct anchoring.
  • the present invention proposes to provide an improved safety valve, capable of authorizing operation in artificial flow, without exhibiting the above-mentioned defects of known valves.
  • An object of the invention is in particular to provide a valve for an artificial flow well, benefiting from a very robust anchoring system and making it possible to guarantee correct anchoring during installation.
  • Another objective is to authorize easy unlocking and raising of the valve, without risk of breaking.
  • Another objective is to provide a valve for an artificial well which benefits from most of the advantages of the improved valves for eruptive wells described in FR-A 2 602 019 and FR-A 2 602 820.
  • Another objective is to allow an easy transformation of the valves in order to adapt them to the types of wells concerned: wells with artificial flow or eruptive wells.
  • valve according to the invention is described assuming it is in place in an oil well, the terms "high”, “low”, “upper”, “lower”, “base”, “head” ... referring to this position.
  • the valve according to the invention comprises an improved anchoring system of the type fitted to the valve referred to in FR-A 2 602 820, which is combined with an adaptation of the structure of said valve to allow the injection of '' a pressurized fluid in order to lighten the effluent column and allow operation in artificial flow.
  • the dogs are made up of robust mechanical parts, not subject to the risk of breakage, while the hydraulic control system for locking them (by means of the control fluid acting on the wandering piston) has a small radial size allowing to release the central internal volume of the valve and to house the internal tube for passage of the injected fluid, while preserving between this tube and the slide an annular space sufficient for the passage of the effluent.
  • This internal tube is carried by the slide and follows the movements thereof; in the upper part, it slides tightly in the upper attachment sleeve so that the continuity of passage of the injected fluid is permanently ensured at this level; in the lower part, the tube can either come tightly connect with the lower hooking sleeve to ensure the continuity of passage of the injected fluid when the slide is in the low position (valve open), or retract upwards to allow the valve to close when the slide is in the high position (valve closed).
  • valve according to the invention is thus able to provide, for a well with an artificial flow, the same safety features as the eruptive well valve described in the abovementioned application; in addition it benefits from the various advantages of this valve: reduced risks of corrosion and deposits, satisfactory anchoring guarantee, ...
  • the valve body consists of several tubular parts screwed one in the extension of the other by right-hand threads and comprises, at the top, a latch body composed of two screwed tubular parts l '' as an extension of the other by threads on the left: the lower part contains the dogs and is screwed onto the lower contiguous section of the valve body (by threads on the right), while the upper part is partly fitted high of a head for fixing the upper hanging sleeve.
  • valve can be extracted from the well by implementing a very simple unlocking and undocking procedure: it suffices to unscrew the two parts of the lock body (by an appropriate rotation of the train of upper tubes) and reassemble the assembly by pulling on this train of tubes.
  • valve structure is preferably in accordance with that described in FR-A 2 602 819.
  • seals located on either side of the inlet of the control fluid are advantageously positioned immediately below and above said fluid inlet, the anchoring system being located above the upper lining, while the return spring is positioned below the lower lining in an annular housing constituted by a part of the sealed volume intended to receive the control fluid.
  • Such a structure allows complete drainage of the sealed volume containing the control fluid during pressurization, while the arrangement of the return spring guarantees total immersion of the latter in the control fluid.
  • This spring is sheltered from the attacks of effluent or corrosive gases and can be made of a steel with high modulus of elasticity favorable to obtaining a high restoring force, stable over time.
  • the safety valve shown by way of example in the figures is intended to equip an oil well production tube called to work at an artificial flow rate by means of an injection of gas under pressure.
  • the production tube has a receptacle sleeve 1 provided with a control fluid inlet line 1 a and an anchoring groove 1 b, the edges of which are in the form of a conical ramp. (conical lower face 1 bi and conical upper face 1 bs).
  • the valve advantageously has the general structure of the improved valve described in FR-A 2 602 819; it comprises a valve body of generally tubular shape, consisting of several tubular parts secured to each other: upper lock body 2, upper seal holder 3 carrying an upper seal 15, tubular spacer 4, ring-nut of locking 5, spring jacket 6 having an upper heel 6a carrying a lower seal 16, lower sleeve 7, obturator body 8.
  • the seal carrier 3 and the spacer 4 are pierced with holes 3a, 4a for the passage of the control fluid from line 1a.
  • the seals, upper 15 and lower 16, are positioned immediately above and below the lumen 4a.
  • the various tubular parts forming the valve body are secured by screwing one in the extension of the other by means of threads on the right.
  • 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 4.
  • This slide is returned to its upper position by a return spring 10 which is housed, below the linings 15 and 16, in a sealed annular volume delimited by the external face of the slide 9 and the inner face of the jacket 6.
  • the spring 10 extends between, on the one hand, an upper support constituted by a ring-nut 19 screwed around the slide 9 (with the interposition of an auxiliary sleeve 18 having the same function as the valve bushing described in FR-A 2 602 949), on the other hand, a lower bushing 20 slidably mounted around said slider.
  • a lower stop 9c limits the downward stroke of said bush relative to the slide (this stop 9c is formed by a shoulder formed on the external surface of the slide).
  • this sleeve 20 is applied against a shoulder 7a provided inside the valve body (shoulder formed by the upper edge of the sleeve 7 screwed into the spring jacket 6).
  • This slide is hydraulically controlled downwards by the control fluid arriving by the line la when the latter is pressurized.
  • This control fluid is formed by a lubricating liquid; when pressurized, it passes through the ports 4a and 3a, is stopped at the valve body / sleeve-receptacle interface by the seals 15 and 16 located on either side of said ports and comes fill a sealed volume located between the slide and the valve body.
  • the slide 9 has, at the lower seal 22, a larger section than that existing at the upper seal 21 so that the pressure control fluid acts downward on said slide through this section difference.
  • the shutter body 8 comprises a movable shutter member, constituted by a valve 11 which is articulated on said body so as to be able to pivot between a retracted opening position on the side (FIG. 1 ) and a closed position where said valve closes the valve body by pressing against a seal carried by it ( Figure 4).
  • the valve 11 is returned to the closed position by a spring 12 disposed around its axis of articulation.
  • this shutter member can be of the type described in FR-A 2 602 848.
  • 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 a shoulder 8a of the shutter body: said slider then pushes the shutter member 11 and keeps it in the open position.
  • the return spring 10 When the pressure of the control fluid accidentally or voluntarily drops, the return spring 10 generates a displacement of the slider upwards, until its high position where it is set back in the sleeve 7 (FIG. 4). The shutter member 11 is then released and closes under the action of its own spring 12.
  • the slide 9 carries a concentric internal tube 300 for the passage of a pressurized gas which is injected in order to lighten the column of effluent and produce an artificial flow.
  • the slide 9 is formed of two sections screwed one after the other: an upper section 9s extending over most of its height and a lower section 9i ( Figure 2); the upper section 9s carries in the lower part a notch 9e which is closed by the lower section 9i when the latter is screwed at the end of said upper section.
  • This indentation 9e can thus contain and trap a ring 301 which can be seen on the cross section C.
  • This ring concentric with the slide 9 and the tube 300, is fixed to the peripheral ends of radial fins 302, in the example three in number, distributed around the inner tube 300; the central ends of these fins are fixed by welding to the tube 300.
  • each fin 302 is extended by a profiled end piece so as to reduce the pressure drop and the turbulence they cause in the effluent, which is called to flow from bottom to top in the annular space between the internal tube 300 and the slide 9.
  • the internal tube 300 thus moves with the slide 9 which carries it, between a low position (open position shown in Figure 1) and a high position (closed position shown in Figure 4). Its length is provided so that, in the low position, its lower end called the connection 300i is located slightly below the level of the shutter valve 11 and that, in its high position, this lower connection end retracts above the level of said valve.
  • said lower connection end 300i is coupled with a lower hooking sleeve 303 whose role is to maintain a train of lower tubes (shown in Ti in broken lines in FIG. 1). ) inside which the injected gas passes.
  • the lower attachment sleeve 303 is provided at its lower part with a right-hand thread, around which the last tube Ti of the lower train is screwed.
  • the attachment sleeve 303 is secured to the base of the valve body on the shutter body 8, by means of radial arms 304, three in example (FIG. 8), which are distributed around said sleeve and the peripheral ends of which are integral with an annular base 305 forming the valve nose.
  • this part 305 is screwed onto the shutter body (by a right-hand thread). If necessary, it could be made in one piece with this body (the body 8 / part 305 / arm 304 / sleeve 303 assembly being constituted by a single piece from the foundry).
  • the lower attachment sleeve 303 is equipped at its upper end with an added conical bearing 306, formed on a short section of tube screwed into the sleeve 303 with the interposition of a seal 307.
  • This section of tube is a synthetic material such as polyamide, capable of ensuring a seal in contact with the internal tube 300 when the latter is in the low position; the lower connection end 300i of said internal tube is cut to a conjugate conical shape of the bearing 306 in order to make the sealed connection.
  • the valve is equipped with a mechanical anchoring system with hydraulic stress, which essentially comprises the lock body 2, anchoring dogs 54, a locking sleeve 55 and a sliding piston 58 .
  • the lock body is screwed by a right-hand thread 50 on the contiguous section of the valve body (constituted by the upper seal holder 3). Its lower end 51 c 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 screwed in the extension of one another by left-hand threads 308. These threads which are of not opposite to that of all the others valve threads allow by a clockwise rotation to release the two parts 51 and 52 in order to reassemble the valve, as will be seen below.
  • 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 is a compact mechanical part, without risk of breakage, and 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 project from the lock body as shown in Figures 1 and 6 (anchoring position) or on the contrary retract therein (as shown in Figures 9 or 10).
  • the lower part 51 of the lock body has a stop shoulder 51 a, which is located below and near the dogs 54.
  • This shoulder has the shape of a conical ramp oriented downwards, so as to come to the contact of the conical underside 1 bi of the anchoring groove 1 b when the valve is lowered into the receptacle sleeve 1.
  • the lock body has, above this shoulder 51 a, a diameter slightly larger than below it, 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 51 b 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 separation by unscrewing the parts 51 and 52.
  • the upper part 52 also includes an internal face 52b which has the form of a conical ramp oriented downwards, adapted to serve as an extreme stop for the locking sleeve 55.
  • the upper part 52 finally comprises an internal shoulder 52c which has the shape of a conical ramp facing upwards, with a view to allowing said upper part 52 to be hooked onto the locking sleeve 55 after unscrewing the parts 51 and 52.
  • Said locking sleeve 55 in equipression is slidably mounted in the lock body with interposition of a braking joint 59 at the interface sleeve / lower part 51; the sleeve is independent of the wandering piston 58 which can only exert on it an upward thrust.
  • Said locking sleeve 55 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 limits the stroke of the sleeve 55, if necessary abutting against the internal face 52b of the upper part 52.
  • the locking sleeve 55 is further provided with a hooking shoulder 55a, located below the level of its cam 56 and conjugated with the hooking shoulder 51b of the part 51 so as to be able to cooperate with this last after unscrewing the parts 51 and 52 and clearing up 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 latch body, with a view to attaching said upper part to said bushing after unscrewing the parts 51 and 52.
  • 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 freely in leaktight manner between the valve body (upper part of the seal holder 3) and the upper end of the slide 9.
  • This sliding piston 58 is provided with the seals already mentioned, internal 21 at the slide / piston-sliding interface, and external 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 . It should be noted that the sliding piston 58 is free to slide under the effect of hydraulic pressures in the absence of any mechanical blocking.
  • the control fluid acts first on the sliding piston 58 to tend to move it upwards from a low position where it is in abutment against a shoulder 3b of the seal carrier 3 ( Figure 4) to an upper position where said sliding piston abuts against the projection 51c formed by the lower end of the part 51 ( Figures 1 and 3).
  • 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 slide 9 to tend to move it downwards, from its high closed position (FIG. 4) where the nut ring 19 comes into upper abutment against the heel 6a of the spring jacket 6, towards a low open position (FIG. 1) where said slide comes into abutment against the shoulder 8a of the closure body 8.
  • the internal tube 300 which allows the injection of gas under pressure penetrates at the top into an upper attachment sleeve 309 which has a bore 309a provided with a seal 310, calibrated to allow a tight sliding of the upper end of said internal tube 300.
  • the length of the tube 300 is such that its upper end remains permanently sealed in this bore regardless of its high or low position.
  • the sleeve is tapped on the right to allow the first tube Ts of a train of upper tubes to be screwed into it (broken lines in FIG. 1).
  • the upper attachment sleeve 309 is fixed at the head of the valve body, on the upper part 52 of the lock body, by radial arms 311, in the example three in number, distributed around said sleeve (FIG. 5).
  • the peripheral end of these arms is integral with an annular fixing head 313 screwed by threads on the right on the upper part 52.
  • valve being depressurized, its slide 9 is in the high position by the action of the return spring 10; the internal tube 300 secured to the slide 9 is itself in the high position.
  • the valve 11 is closed.
  • the sliding piston 58 and the locking sleeve 55 are in the low position, the dogs 54 being free to fade.
  • a train of lower tubes Ti is first lowered into the well in the traditional way using conventional jaw tools.
  • the valve is screwed by its lower anchoring sleeve 303 on the upper end of the train of lower tubes; the upper anchoring sleeve 309 is then screwed onto the lower end of another train of tubes Ts and the assembly is lowered using conventional jaw tools.
  • the upper tube train Ts generally has a length of the order of 100 to 150 meters.
  • the valve enters the receptacle sleeve 1 of the well production tube; the engagement force of the linings 15 and 16 is overcome by the weight of the train of lower tubes (several tonnes).
  • the dogs 54 of the valve which are floating, are erased 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 radially maneuvers the dogs 54 and locks them inside the anchoring groove 1b.
  • the valve is at this time anchored in the position shown in FIG. 4 (with the exception, however, of the sliding piston which is in the high position).
  • the internal tube 300 descends with the slide 9 and, at the end of the lower stroke, comes to cooperate with the conical bearing 306 of the lower anchoring sleeve 303, while in the upper part, the upper end of said internal tube has slid in the upper anchoring sleeve 309 remaining tightly engaged therein.
  • the valve is open and the continuity of the injected fluid circuit is ensured.
  • the valve of the invention therefore offers the ability to ensure, at each installation, that the anchoring has been correctly obtained, poor anchoring can come from multiple causes: deterioration of the seals 15 and 16 in progress lowering or deterioration of the receptacle sleeve 1 at said linings (preventing pressurization of the control fluid), deposition due to the effluent in the anchoring groove 1b, (preventing the dogs from leaving 54) ...
  • 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 and stopping of the injected gas. It then comes into the position of FIG. 4.
  • the return spring 10 has caused an displacement upwards of the slide 9 and of the internal tube 300 which is linked to it, releasing the shutter member 11 which closes under the action of its own spring 12 aided by the pressure of the well (pressurized by the gas already injected).
  • the upstream pressure from the well is applied to the entire section of the valve; the dogs 54 of the valve then come to apply against the conical upper face 1 bs of the anchoring groove 1b, which conditions a locking effect of the sleeve 55 all the more powerful as the pressure of the well is high: the valve benefits from a self-locking proportional to the pressure of the well.
  • the valve is reopened, first by injecting pressurized gas into the upper tubes Ts and internal tube 300 in order to balance the pressure on either side of the valve, then putting the line back into pressure hydraulic control: the sliding piston 58 rises against the sleeve 55 and against its stop 51 and the opening occurs as previously explained by displacement of the slide 9 and the internal tube 300 downward under the pressure of the control fluid. Furthermore, the disengaging and the raising of the valve according to the invention are carried out as follows (FIG. 10).
  • the hydraulic control line being purged and the gas injection stopped, the well is put in safety, that is to say in the impossibility of debiting (thanks to a preliminary balancing by pumping water).
  • the upper train of tubes is then caused to turn to the right by standard keys so as to unscrew the left-hand thread 308 which connects the upper part 52 of the lock body and the lower part 51.
  • this locking sleeve 55 rises until its shoulder 55a comes to bear against the shoulder 51b of the lower part of the lock body.
  • the dogs 54 are then released and can fade inwards: the continuation of the traction causes the valve to rise up to the disengagement of the seals 15 and 16, the valve then being able to be raised to the surface.

Description

L'invention concerne une vanne de sécurité destinée à être insérée dans un tube de production de puits pétrolier en vue d'en assurer l'ouverture ou la fermeture, tout en autorisant un fonctionnement en débit artificiel par injection d'un fluide sous pression, dit fluide injecté.The invention relates to a safety valve intended to be inserted into an oil well production tube in order to ensure opening or closing, while allowing operation in artificial flow by injection of a pressurized fluid, says injected fluid.

Les vannes de sécurité pour puits pétroliers ont pour fonction de stopper automatiquement la production d'effluent si un incident survient en tête de puits ou en aval de celles-ci. Elles sont commandées hydrauliquement à l'ouverture depuis la surface et se ferment automatiquement au moyen d'un puissant ressort de rappel dès l'apparition d'une chute de pression hydraulique, commandée ou accidentelle. Ces vannes ont fait l'objet de nombreuses études de mise au point et de perfectionnement, et leur emploi s'est généralisé en particulier dans les puits éruptifs offshore.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.

Lors de leur mise en place, ces vannes sont ancrées dans un manchon-réceptacle logé dans le tube de production ; l'ancrage est réalisé au moyen d'un système de chiens mécaniques capables de subir un déplacement radial qui les amènent à pénétrer dans une gorge d'ancrage du manchon-réceptacle : ces chiens sont alors verrouillés dans leur position d'ancrage grâce à un ressort qui repousse une bague de verrouillage à l'intérieur desdits chiens. Lorsque ces chiens sont correctement positionnés et verrouillés, ils fournissent un ancrage bénéficiant de bonnes qualités de résistance mécanique. Toutefois, la mise en oeuvre d'un tel système d'ancrage est une opération laborieuse effectuée en aveugle à l'intérieur du puits et elle n'est assortie d'aucune garantie de bonne fin, l'opérateur n'ayant aucun moyen de savoir si la vanne est correctement ancrée et verrouillée dans le manchon-réceptacle.During their installation, these valves are anchored in a receptacle sleeve housed in the production tube; anchoring is carried out by means of a system of mechanical dogs capable of undergoing a radial displacement which cause them to enter an anchoring groove of the receptacle sleeve: these dogs are then locked in their anchoring position by means of a spring which pushes a locking ring inside said dogs. When these dogs are correctly positioned and locked, they provide an anchorage benefiting from good qualities of mechanical resistance. However, the implementation of such an anchoring system is a laborious operation carried out blind inside the well and it is not accompanied by any performance guarantee, the operator having no means of find out if the valve is properly anchored and locked in the receptacle sleeve.

Par ailleurs, lorsque la pression des effluents devient trop faible dans un puits, on est amené à injecter dans un train de tubes passant au centre du tube de production, un fluide sous pression, généralement un gaz, qui sert à alléger la colonne d'effluent. Les vannes connues ne sont pas adaptées à cette injection, en particulier du fait que les chiens d'ancrage et leur système de verrouillage présentent un encombrement radial trop important pour autoriser le passage d'un tube interne d'injection de diamètre suffisant.Furthermore, when the pressure of the effluents becomes too low in a well, it is necessary to inject into a train of tubes passing through the center of the production tube, a pressurized fluid, generally a gas, which is used to lighten the column of effluent. The known valves are not suitable for this injection, in particular because the anchoring dogs and their locking system have too large a radial bulk to allow the passage of an internal injection tube of sufficient diameter.

Le brevet FR n 02 536 783 et son certificat d'addition n 0 2 555 246 présentent une vanne de structure modifiée par rapport aux vannes traditionnelles ; dans cette nouvelle vanne, le verrouillage est réalisé au moyen d'une bague élastique qui est maintenue radialement rétractée par un système de collerette et clavettes lors de la descente de la vanne et qui est relâchée en fin de descente lorsque la bague parvient au niveau de la gorge d'ancrage du manchon-réceptacle. Ce système permet la mise en place d'un tube interne d'injection de gaz, mais possède le défaut très grave d'être extrêmement fragile : la bague élastique se casse très fréquemment soit lors de la mise en place de la vanne, soit lors de son déverrouillage, et chaque rupture occasionne de très graves difficultés pratiques de réparation et des risques importants pour les personnels. De plus, comme dans le cas des systèmes traditionnels, la mise en place s'effectue en aveugle, sans garantie d'ancrage correct.FR patent No. 0 2,536,783 and its certificate of addition No. 0 2,555,246 have a valve structure modified with respect to traditional valves; in this new valve, the locking is achieved by means of an elastic ring which is held radially retracted by a system of collar and keys when the valve is lowered and which is released at the end of the descent when the ring reaches the level of the anchoring groove of the receptacle sleeve. This system allows the installation of an internal gas injection tube, but has the very serious defect of being extremely fragile: the elastic ring breaks very frequently either during the installation of the valve, or during of its unlocking, and each break causes very serious practical difficulties of repair and significant risks for personnel. In addition, as in the case of traditional systems, the installation is carried out blind, without guarantee of correct anchoring.

La présente invention se propose de fournir une vanne de sécurité perfectionnée, apte à autoriser un fonctionnement en débit artificiel, sans présenter les défauts sus-évoqués des vannes connues.The present invention proposes to provide an improved safety valve, capable of authorizing operation in artificial flow, without exhibiting the above-mentioned defects of known valves.

Un objectif de l'invention est en particulier de fournir une vanne pour puits en débit artificiel, bénéficiant d'un système d'ancrage très robuste et permettant de garantir un ancrage correct lors de la pose.An object of the invention is in particular to provide a valve for an artificial flow well, benefiting from a very robust anchoring system and making it possible to guarantee correct anchoring during installation.

Un autre objectif est d'autoriser un déverrouillage et une remontée faciles de la vanne, sans risque de rupture.Another objective is to authorize easy unlocking and raising of the valve, without risk of breaking.

Un autre objectif est de fournir une vanne pour puits artificiel qui bénéficie de la plupart des avantages des vannes perfectionnées pour puits éruptifs décrites dans FR-A 2 602 019 et FR-A 2 602 820.Another objective is to provide a valve for an artificial well which benefits from most of the advantages of the improved valves for eruptive wells described in FR-A 2 602 019 and FR-A 2 602 820.

Un autre objectif est de permettre une transformation aisée des vannes afin de les adapter aux types de puits concernés : puits à débit artificiel ou puits éruptifs.Another objective is to allow an easy transformation of the valves in order to adapt them to the types of wells concerned: wells with artificial flow or eruptive wells.

Afin de faciliter la compréhension, la vanne conforme à l'invention est décrite en la supposant en place dans un puits pétrolier, les termes "haut", "bas", "supérieur", "inférieur", "base", "tête"... se référant à cette position.In order to facilitate understanding, the valve according to the invention is described assuming it is in place in an oil well, the terms "high", "low", "upper", "lower", "base", "head" ... referring to this position.

La vanne de sécurité visée par l'invention est destinée à être insérée dans un tube de production de puits pétrolier en vue d'en assurer l'ouverture ou la fermeture, tout en autorisant un fonctionnement en débit artificiel par injection d'un fluide sous pression, dit fluide injecté ; selon l'invention, cette vanne comprend en combinaison :

  • - un corps de vanne de forme générale tubulaire,
  • - un clapet mobile d'obturation, situé en partie basse dudit corps et sollicité vers sa position de fermeture,
  • - un coulisseau tubulaire agencé pour pouvoir coulisser longitudinalement à l'intérieur du corps de vanne en vue d'engendrer dans son mouvement descendant l'ouverture du clapet d'obturation,
  • - un ressort de rappel disposé dans un logement annulaire situé entre le coulisseau et le corps de vanne, de façon à solliciter ledit coulisseau vers une position haute correspondant à la fermeture du clapet d'obturation,
  • - des moyens de déplacement hydraulique du coulisseau vers le bas, comportant une arrivée de fluide de commande à travers le corps de vanne et un volume étanche entre le coulisseau et le corps destiné à recevoir le fluide de commande, le coulisseau présentant une différence de section soumise à la pression du fluide contenu dans ledit volume étanche de façon à subir un effort vers le bas lorsque ledit volume est en pression,
  • - des garnitures d'étanchéité, inférieure et supérieure, disposées autour du corps de vanne en vue d'assurer une étanchéité à l'interface entre ledit corps de vanne et un manchon-réceptacle équipant le tube de production, à des niveaux situés au-dessous et au-dessus de l'arrivée du fluide de commande,
  • - un tube interne de passage du fluide injecté, de diamètre inférieur à celui du coulisseau tubulaire et logé à l'intérieur de celui-ci, ledit tube interne étant assujetti au coulisseau par des moyens de fixation et possédant une extrémité inférieure de connexion et une longueur telle que ladite extrémité inférieure de connexion se trouve située au-dessus de clapet d'obturation lorsque le coulisseau est en position haute et au-dessous dudit clapet lorsque ledit co_ulisseau est en position basse,
  • - un manchon d'accrochage inférieur, assujetti à la base du corps de vanne et adapté pour permettre la fixation de tubes inférieurs de passage du fluide injecté, ledit manchon d'accrochage inférieur possédant une extrémité supérieure conjuguée de l'extrémité inférieure de connexion du tube interne de façon à permettre de relier étanchément ces extrémités tout en autorisant leur libération par un déplacement de celles-ci dans le sens de leur écartement,
  • - un manchon d'accrochage supérieur, assujetti en tête du corps de vanne et adapté pour permettre la fixation de tubes supérieurs de passage du fluide injecté, ledit manchon d'accrochage supérieur possédant un alésage interne adapté pour permettre un coulissement étanche de l'extrémité supérieure du tube interne,
  • - un système mécanique d'ancrage à sollicitation hydraulique, situé en partie haute du corps de vanne au-dessous du manchon d'accrochage supérieur et adapté pour permettre d'assujettir le corps de vanne dans le manchon-réceptacle logé dans le tube de production, ledit système comprenant:
  • . des moyens d'arrêt cu corps de vanne dans ledit manchon-réceptacle,
  • . des chiens mobiles radialement pour pouvoir pénétrer, dans la position d'arrêt, dans une gorge d'ancrage du manchon-réceptacle,
  • . un piston-baladeur tubulaire, monté coulissant pour pouvoir se déplacer librement dans le corps de vanne autour de la partie haute du coulisseau, entre une position basse de butée et une position haute de butée en l'absence de tout blocage mécanique sur la hauteur de son déplacement, ledit piston-baladeur étant agencé pour présenter une surface soumise à la pression du fluide de commande contenu dans le volume étanche de façon à subir un effort vers le haut lorsque ledit volume est en pression,
  • . une douille de verrouillage en équipression, montée coulissante dans le corps de vanne au-dessus du piston-baladeur mais indépendamment de celui-ci de façon que ledit piston-baladeur puisse uniquement exercer sur ladite douille une poussée vers le haut sans possibilité d'entraînement vers le bas, ladite douille possédant une came périphérique adaptée pour venir en correspondance avec les chiens et repousser radialement ceux-ci dans la position haute du piston-baladeur.
The safety valve targeted by the invention is intended to be inserted into an oil well production tube in order to ensure opening or closing, while allowing operation in artificial flow by injecting a fluid under pressure, said injected fluid; according to the invention, this valve comprises in combination:
  • - a valve body of generally tubular shape,
  • - a movable shutter valve, located in the lower part of said body and urged towards its closed position,
  • - a tubular slide arranged to be able to slide longitudinally inside the valve body in order to generate in its downward movement the opening of the shutter valve,
  • a return spring disposed in an annular housing located between the slide and the valve body, so as to urge said slide towards a high position corresponding to the closing of the shutter valve,
  • means of hydraulic displacement of the slide downwards, comprising an inlet for control fluid through the valve body and a sealed volume between the slide and the body intended to receive the control fluid, the slide having a difference in cross-section subjected to the pressure of the fluid contained in said sealed volume so as to undergo a downward force when said volume is under pressure,
  • - sealings, lower and upper, arranged around the valve body in order to ensure a seal at the interface between said valve body and a sleeve-receptacle fitted to the production tube, at levels located at- of under and above the arrival of the control fluid,
  • an internal tube for the passage of the injected fluid, with a diameter smaller than that of the tubular slide and housed inside the latter, said internal tube being secured to the slide by fixing means and having a lower connection end and a length such that the said lower connection end is situated above the shutter valve when the slide is in the high position and below the said valve when the said joint is in the low position,
  • - A lower attachment sleeve, secured to the base of the valve body and adapted to allow the fixing of lower tubes for passage of the injected fluid, said lower attachment sleeve having an upper end conjugate with the lower connection end of the internal tube so as to allow these ends to be connected tightly while allowing their release by a displacement of the latter in the direction of their separation,
  • - an upper attachment sleeve, secured at the head of the valve body and adapted to allow the fixing of upper tubes for passage of the injected fluid, said upper attachment sleeve having an internal bore adapted to allow a tight sliding of the end upper inner tube,
  • - a mechanical anchoring system with hydraulic stress, located in the upper part of the valve body below the upper attachment sleeve and adapted to allow the valve body to be secured in the receptacle sleeve housed in the production tube , said system comprising:
  • . means for stopping the valve body in said receptacle sleeve,
  • . radially movable dogs in order to be able to penetrate, in the stopped position, into an anchoring groove of the receptacle sleeve,
  • . a tubular sliding piston, mounted so that it can move freely in the valve body around the upper part of the slide, between a low stop position and a high stop position in the absence of any mechanical blocking on the height of its movement, said sliding piston being arranged to present a surface subjected to the pressure of the control fluid contained in the sealed volume so as to undergo an upward force when said volume is under pressure,
  • . an interlocking locking sleeve, slidingly mounted in the valve body above the sliding piston but independently of the latter so that said sliding piston can only exert on said bushing an upward thrust without the possibility of driving downwards, said bushing having a peripheral cam adapted to come into correspondence with the dogs and push them radially into the high position of the sliding piston.

Ainsi, la vanne conforme à l'invention comprend un système d'ancrage perfectionné du type de celui équipant la vanne visée dans FR-A 2 602 820, qui se combine avec une adaptation de la structure de ladite vanne pour permettre l'injection d'un fluide sous pression en vue d'alléger la colonne d'effluent et permettre un fonctionnement en débit artificiel. Les chiens sont constitués par des pièces mécaniques robustes, non soumises à des risques de rupture, cependant que le système de commande hydraulique de leur verrouillage (par l'entremise du fluide de commande agissant sur le piston-baladeur) présente un faible encombrement radial permettant de libérer le volume interne central de la vanne et d'y loger le tube interne de passage du fluide injecté, tout en préservant entre ce tube et le coulisseau un espace annulaire suffisant pour le passage de l'effluent. Ce tube interne est porté par le coulisseau et suit les déplacements de celui-ci; en partie haute, il coulisse de façon étanche dans le manchon d'accrochage supérieur de sorte que la continuité de passage du fluide injecté est en permanence assurée à ce niveau ; en partie basse, le tube peut soit venir se connecter de façon étanche avec le manchon d'accrochage inférieur pour assurer la continuité de passage du fluide injecté lorsque le coulisseau est en position basse (vanne ouverte), soit s'escamoter vers le haut pour permettre la fermeture du clapet lorsque le coulisseau est en position haute (vanne fermée).Thus, the valve according to the invention comprises an improved anchoring system of the type fitted to the valve referred to in FR-A 2 602 820, which is combined with an adaptation of the structure of said valve to allow the injection of '' a pressurized fluid in order to lighten the effluent column and allow operation in artificial flow. The dogs are made up of robust mechanical parts, not subject to the risk of breakage, while the hydraulic control system for locking them (by means of the control fluid acting on the wandering piston) has a small radial size allowing to release the central internal volume of the valve and to house the internal tube for passage of the injected fluid, while preserving between this tube and the slide an annular space sufficient for the passage of the effluent. This internal tube is carried by the slide and follows the movements thereof; in the upper part, it slides tightly in the upper attachment sleeve so that the continuity of passage of the injected fluid is permanently ensured at this level; in the lower part, the tube can either come tightly connect with the lower hooking sleeve to ensure the continuity of passage of the injected fluid when the slide is in the low position (valve open), or retract upwards to allow the valve to close when the slide is in the high position (valve closed).

La vanne conforme à l'invention est ainsi apte à assurer, pour un puits en débit artificiel, les mêmes sécurités que la vanne de puits éruptifs décrite dans la demande sus-évoquée ; de plus elle bénéficie des divers avantages de cette vanne : risques réduits de corrosions et de dépôts, garantie d'ancrage satisfaisant,...The valve according to the invention is thus able to provide, for a well with an artificial flow, the same safety features as the eruptive well valve described in the abovementioned application; in addition it benefits from the various advantages of this valve: reduced risks of corrosion and deposits, satisfactory anchoring guarantee, ...

Selon une autre caractéristique de l'invention, le corps de vanne est constitué de plusieurs pièces tubulaires vissées les unes dans le prolongement des autres par des filets à droite et comprend, en partie haute, un corps de verrou composé de deux pièces tubulaires vissées l'une dans le prolongement de l'autre par des filets à gauche : la pièce inférieure contient les chiens et est vissée sur le tronçon contigu inférieur du corps de vanne (par des filets à droite), cependant que la pièce supérieure est équipée en partie haute d'une tête de fixation du manchon d'accrochage supérieur.According to another characteristic of the invention, the valve body consists of several tubular parts screwed one in the extension of the other by right-hand threads and comprises, at the top, a latch body composed of two screwed tubular parts l '' as an extension of the other by threads on the left: the lower part contains the dogs and is screwed onto the lower contiguous section of the valve body (by threads on the right), while the upper part is partly fitted high of a head for fixing the upper hanging sleeve.

Comme on le comprendra mieux plus loin, une telle vanne peut être extraite du puits par mise en oeuvre d'une procédure de déverrouillage et de désancrage très simple : il suffit de dévisser les deux pièces du corps de verrou (par une rotation appropriée du train de tubes supérieurs) et de remonter l'ensemble par traction sur ce train de tubes.As will be understood more clearly below, such a valve can be extracted from the well by implementing a very simple unlocking and undocking procedure: it suffices to unscrew the two parts of the lock body (by an appropriate rotation of the train of upper tubes) and reassemble the assembly by pulling on this train of tubes.

Par ailleurs, la structure de la vanne est de préférence conforme à celle décrite dans FR-A 2 602 819. En particulier, les garnitures d'étanchéité situées de part et d'autre de l'arrivée du fluide de commande sont avantageusement positionnées immédiatement au-dessous et au-dessus de ladite arrivée de fluide, le système d'ancrage étant situé au-dessus de la garniture supérieure, cependant que le ressort de rappel est positionné au-dessous de la garniture inférieure dans un logement annulaire constitué par une partie du volume étanche destiné à recevoir le fluide de commande.Furthermore, the valve structure is preferably in accordance with that described in FR-A 2 602 819. In particular, the seals located on either side of the inlet of the control fluid are advantageously positioned immediately below and above said fluid inlet, the anchoring system being located above the upper lining, while the return spring is positioned below the lower lining in an annular housing constituted by a part of the sealed volume intended to receive the control fluid.

Une telle structure permet une purge complète du volume étanche contenant le fluide de commande lors de la mise en pression, cependant que l'agencement du ressort de rappel garantit une totale immersion de celui-ci dans le fluide de commande. Ce ressort se trouve à l'abri des agressions de l'effluent ou des gaz corrosifs et peut être réalisé en un acier à haut module d'élasticité favorable à l'obtention d'une force de rappel élevée, stable dans le temps.Such a structure allows complete drainage of the sealed volume containing the control fluid during pressurization, while the arrangement of the return spring guarantees total immersion of the latter in the control fluid. This spring is sheltered from the attacks of effluent or corrosive gases and can be made of a steel with high modulus of elasticity favorable to obtaining a high restoring force, stable over time.

D'autres caractéristiques, buts et avantages de l'invention ressortiront de la description qui suit en référence aux dessins annexés, lesquels en présentent à titre d'exemple non limitatif un mode de réalisation préférentiel ; sur ces dessins qui font partie intégrante de la présente description :

  • - la figure 1 est une vue en coupe axiale par un plan vertical d'une vanne conforme à l'invention, en position ouverte, ancrée dans son manchon-réceptacle,
  • - les figures 2 et 3 sont des demi-coupes de détail de ladite vanne (respectivement partie basse et partie haute de celle-ci),
  • - la figure 4 est une vue en coupe axiale analogue à la figure 1, la vanne se trouvant dans la position de fermeture,
  • - les figures 5, 6, 7 et 8 sont des coupes transversales de ladite vanne respectivement par des plans A, B, C et D,
  • - la figure 9 est une coupe axiale illustrant l'opération d'ancrage de la vanne (ladite vanne étant représentée dans une position de pré-ancrage, l'ancrage et le verrouillage étant sur le point d'être hydrauliquement commandés),
  • - enfin, la figure 10 est une coupe axiale partielle, illustrant la procédure de désancrage et d'extraction de la vanne.
Other characteristics, objects and advantages of the invention will emerge from the description which follows with reference to the appended drawings, which present by way of nonlimiting example a preferred embodiment; on these drawings which form an integral part of this description:
  • FIG. 1 is a view in axial section through a vertical plane of a valve according to the invention, in the open position, anchored in its receptacle sleeve,
  • FIGS. 2 and 3 are detailed half-sections of said valve (respectively lower part and upper part thereof),
  • FIG. 4 is a view in axial section similar to FIG. 1, the valve being in the closed position,
  • FIGS. 5, 6, 7 and 8 are cross sections of said valve respectively by planes A, B, C and D,
  • FIG. 9 is an axial section illustrating the valve anchoring operation (said valve being shown in a pre-anchoring position, the anchoring and the locking being about to be hydraulically controlled),
  • - Finally, Figure 10 is a partial axial section, illustrating the procedure for disengaging and extracting the valve.

La vanne de sécurité représentée à titre d'exemple aux figures est destinée à équiper un tube de production de puits pétrolier appelé à travailler en débit artificiel grâce à une injection de gaz sous pression. De façon traditionnelle, le tube de production est doté d'un manchon-réceptacle 1 pourvu d'une ligne d'arrivée de fluide de commande 1 a et d'une gorge d'ancrage 1 b dont les bordures sont en forme de rampe conique (face inférieure conique 1 bi et face supérieure conique 1 bs).The safety valve shown by way of example in the figures is intended to equip an oil well production tube called to work at an artificial flow rate by means of an injection of gas under pressure. Traditionally, the production tube has a receptacle sleeve 1 provided with a control fluid inlet line 1 a and an anchoring groove 1 b, the edges of which are in the form of a conical ramp. (conical lower face 1 bi and conical upper face 1 bs).

La vanne présente avantageusement la structure générale de la vanne perfectionnée décrite dans FR-A 2 602 819; elle comprend un corps de vanne de forme générale tubulaire, constitué de plusieurs pièces tubulaires assujetties les unes aux autres : corps de verrou supérieur 2, porte-joint supérieur 3 portant une garniture d'étanchéité supérieure 15, entretoise tubulaire 4, bague-écrou de blocage 5, chemise de ressort 6 possédant un talon supérieur 6a portant une garniture d'étanchéité inférieure 16, manchon inférieur 7, corps d'obturateur 8. Le porte-joint 3 et l'entretoise 4 sont percés de lumières 3a, 4a pour le passage du fluide de commande provenant de la ligne 1a. Les garnitures d'étanchéité, supérieure 15 et inférieure 16, sont positionnées immédiatement au-dessus et au-dessous de la lumière 4a. Les diverses pièces tubulaires formant le corps de vanne sont assujetties par vissage les unes dans le prolongement des autres au moyen de filets à droite.The valve advantageously has the general structure of the improved valve described in FR-A 2 602 819; it comprises a valve body of generally tubular shape, consisting of several tubular parts secured to each other: upper lock body 2, upper seal holder 3 carrying an upper seal 15, tubular spacer 4, ring-nut of locking 5, spring jacket 6 having an upper heel 6a carrying a lower seal 16, lower sleeve 7, obturator body 8. The seal carrier 3 and the spacer 4 are pierced with holes 3a, 4a for the passage of the control fluid from line 1a. The seals, upper 15 and lower 16, are positioned immediately above and below the lumen 4a. The various tubular parts forming the valve body are secured by screwing one in the extension of the other by means of threads on the right.

A l'intérieur du corps de vanne, est monté un coulisseau tubulaire 9 apte à se déplacer longitudinalement dans le corps de vanne, entre une position basse (correspondant à l'ouverture) représentée à la figure 1 et une position haute (correspondant à la fermeture) représentée à la figure 4. Ce coulisseau est rappelé vers sa position haute par un ressort de rappel 10 qui est logé, au-dessous des garnitures 15 et 16, dans un volume annulaire étanche délimité par la face externe du coulisseau 9 et la face interne de la chemise 6. Le ressort 10 s'étend entre, d'une part, un appui supérieur constitué par une bague-écrou 19 vissée autour du coulisseau 9 (avec interposition d'une douille auxiliaire 18 ayant la même fonction que la douille de la vanne décrite dans FR-A 2 602 949), d'autre part, une douille inférieure 20 montée coulissante autour dudit coulisseau. Une butée inférieure 9c limite la course vers le bas de ladite douille par rapport au coulisseau (cette butée 9c est formée par un épaulement ménagé sur la surface externe du coulisseau). En outre, dans sa position basse par rapport au corps de vanne, cette douille 20 vient s'appliquer contre un épaulement 7a prévu à l'intérieur du corps de vanne (épaulement formé par le chant supérieur du manchon 7 vissé dans la chemise de ressort 6).Inside the valve body, is mounted 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 4. This slide is returned to its upper position by a return spring 10 which is housed, below the linings 15 and 16, in a sealed annular volume delimited by the external face of the slide 9 and the inner face of the jacket 6. The spring 10 extends between, on the one hand, an upper support constituted by a ring-nut 19 screwed around the slide 9 (with the interposition of an auxiliary sleeve 18 having the same function as the valve bushing described in FR-A 2 602 949), on the other hand, a lower bushing 20 slidably mounted around said slider. A lower stop 9c limits the downward stroke of said bush relative to the slide (this stop 9c is formed by a shoulder formed on the external surface of the slide). In addition, in its low position relative to the valve body, this sleeve 20 is applied against a shoulder 7a provided inside the valve body (shoulder formed by the upper edge of the sleeve 7 screwed into the spring jacket 6).

Ces dispositions permettent de démonter la vanne sans danger de détente du ressort de rappel 10, puisque celui-ci demeure prisonnier autour du coulisseau entre l'appui supérieur 19 et la douille inférieure 20 qui vient buter contre l'épaulement 9c dudit coulisseau.These provisions make it possible to dismantle the valve without danger of relaxation of the return spring 10, since the latter remains trapped around the slide between the upper support 19 and the lower bush 20 which abuts against the shoulder 9c of said slide.

Ce coulisseau est hydrauliquement commandée vers le bas par le fluide de commande arrivant par la ligne la lorsque cette dernière est mise sous pression. Ce fluide de commande est formée par un liquide lubrifiant ; lors de la mise en pression, il passe à travers les lumières 4a et 3a, est arrêté à l'interface corps de vanne/manchon-réceptacle par les garnitures d'étanchéité 15 et 16 situées de part et d'autre desdites lumières et vient remplir un volume étanche situé entre le coulisseau et le corps de vanne.This slide is hydraulically controlled downwards by the control fluid arriving by the line la when the latter is pressurized. This control fluid is formed by a lubricating liquid; when pressurized, it passes through the ports 4a and 3a, is stopped at the valve body / sleeve-receptacle interface by the seals 15 and 16 located on either side of said ports and comes fill a sealed volume located between the slide and the valve body.

Ce volume étanche est limité, à l'interface coulis- seau/corps de vanne :

  • . d'une part, par un joint d'étanchéité supérieur 21 disposé au-dessus de l'arrivée du fluide de commande dans une gorge d'un piston-baladeur 58 qui fait partie du système d'ancrage décrit plus loin (un joint complémentaire 24 étant prévu sur la surface externe dudit piston-baladeur pour assurer l'étanchéité à l'interface de celui-ci et du corps de vanne),
  • . d'autre part, par un joint d'étanchéité inférieur 22 disposé dans une gorge au-dessous et au voisinage de l'extrémité inférieure du ressort de rappel 10, en appui contre le coulisseau.
This tight volume is limited, at the slide / valve body interface:
  • . on the one hand, by an upper seal 21 arranged above the inlet of the control fluid in a groove of a sliding piston 58 which is part of the anchoring system described below (a complementary seal 24 being provided on the external surface of said sliding piston to ensure sealing at the interface of the latter and of the valve body),
  • . on the other hand, by a lower seal 22 arranged in a groove below and in the vicinity of the lower end of the return spring 10, in abutment against the slide.

Le coulisseau 9 présente, au niveau du joint inférieur 22, une section plus grande que celle existant au niveau du joint supérieur 21 de sorte que le fluide de commande en pression agit vers le bas sur ledit coulisseau par le biais de cette différence de section.The slide 9 has, at the lower seal 22, a larger section than that existing at the upper seal 21 so that the pressure control fluid acts downward on said slide through this section difference.

Il est à souligner que, lors de la pressurisation de la ligne de fluide de commande, le ressort de rappel 10 est totalement immergé dans le liquide lubrifiant et isolé de l'effluent ; de plus la configuration du volume étanche contenant le fluide de commande permet une purge de ce volume qui préserve ce ressort de tout contact corrosif avec des gaz.It should be emphasized that, during the pressurization of the control fluid line, the return spring 10 is completely immersed in the lubricating liquid and isolated from the effluent; more the configuration of the sealed volume containing the control fluid allows a purge of this volume which preserves this spring from any corrosive contact with gases.

Par ailleurs, en partie basse, le corps d'obturateur 8 comporte un organe mobile d'obturation, constitué par un clapet 11 qui est articulé sur ledit corps de façon à pouvoir pivoter entre une position d'ouverture escamotée sur le côté (figure 1) et une position de fermeture où ledit clapet obture le corps de vanne en s'appliquant contre un joint d'étanchéité porté par celui-ci (figure 4). Le clapet 11 est rappelé vers la position de fermeture par un ressort 12 disposé autour de son axe d'articulation. Il est à noter que cet organe d'obturation peut être du type décrit dans FR-A 2 602 848.Furthermore, in the lower part, the shutter body 8 comprises a movable shutter member, constituted by a valve 11 which is articulated on said body so as to be able to pivot between a retracted opening position on the side (FIG. 1 ) and a closed position where said valve closes the valve body by pressing against a seal carried by it (Figure 4). The valve 11 is returned to the closed position by a spring 12 disposed around its axis of articulation. It should be noted that this shutter member can be of the type described in FR-A 2 602 848.

Sous l'effet de la commande hydraulique, le coulisseau 9 est déplacé vers sa position basse jusqu'à venir en butée avec un épaulement 8a du corps d'obturateur : ledit coulisseau repousse alors l'organe d'obturation 11 et le maintient dans la position d'ouverture. Lorsque la pression du fluide de commande baisse accidentellement ou volontairement, le ressort de rappel 10 engendre un déplacement du coulisseau vers le haut, jusqu'à sa position haute où celui-ci se trouve en retrait dans le manchon 7 (figure 4). L'organe d'obturation 11 est alors libéré et se referme sous l'action de son propre ressort 12.Under the effect of the hydraulic control, the slider 9 is moved to its low position until it comes into abutment with a shoulder 8a of the shutter body: said slider then pushes the shutter member 11 and keeps it in the open position. When the pressure of the control fluid accidentally or voluntarily drops, the return spring 10 generates a displacement of the slider upwards, until its high position where it is set back in the sleeve 7 (FIG. 4). The shutter member 11 is then released and closes under the action of its own spring 12.

De plus, le coulisseau 9 porte un tube interne concentrique 300 pour le passage d'un gaz sous pression qui est injecté afin d'alléger la colonne d'effluent et produire un débit artificiel.In addition, the slide 9 carries a concentric internal tube 300 for the passage of a pressurized gas which is injected in order to lighten the column of effluent and produce an artificial flow.

A cet effet, le coulisseau 9 est formé de deux tronçons vissés l'un à la suite de l'autre: un tronçon supérieur 9s s'étendant sur la plus grande partie de sa hauteur et un tronçon inférieur 9i (figure 2) ; le tronçon supérieur 9s porte en partie basse une échancrure 9e qui est fermée par le tronçon inférieur 9i lorsque celui-ci est vissé en bout dudit tronçon supérieur.To this end, the slide 9 is formed of two sections screwed one after the other: an upper section 9s extending over most of its height and a lower section 9i (Figure 2); the upper section 9s carries in the lower part a notch 9e which is closed by the lower section 9i when the latter is screwed at the end of said upper section.

Cette échancrure 9e peut ainsi contenir et emprisonner une bague 301 que l'on aperçoit sur la coupe transversale C. Cette bague, concentrique au coulisseau 9 et au tube 300, est fixée sur les extrémités périphériques d'ailettes radiales 302, en l'exemple au nombre de trois, réparties autour du tube interne 300 ; les extrémités centrales de ces ailettes sont fixées par soudure sur le tube 300. En partie basse, chaque ailette 302 se prolonge par un embout profilé de façon à réduire la perte de charge et les turbulences qu'elles occasionnent dans l'effluent, lequel est appelé à s'écouler de bas en haut dans l'espace annulaire compris entre le tube interne 300 et le coulisseau 9.This indentation 9e can thus contain and trap a ring 301 which can be seen on the cross section C. This ring, concentric with the slide 9 and the tube 300, is fixed to the peripheral ends of radial fins 302, in the example three in number, distributed around the inner tube 300; the central ends of these fins are fixed by welding to the tube 300. In the lower part, each fin 302 is extended by a profiled end piece so as to reduce the pressure drop and the turbulence they cause in the effluent, which is called to flow from bottom to top in the annular space between the internal tube 300 and the slide 9.

Le tube interne 300 se déplace ainsi avec le coulisseau 9 qui le porte, entre une position basse (position d'ouverture représentée à la figure 1) et une position haute (position d'obturation représentée à la figure 4). Sa longueur est prévue de sorte que, dans la position basse, son extrémité inférieure dite de connexion 300i se situe légèrement au-dessous du niveau du clapet d'obturation 11 et que, dans sa position haute, cette extrémité inférieure de connexion s'escamote au-dessus du niveau dudit clapet.The internal tube 300 thus moves with the slide 9 which carries it, between a low position (open position shown in Figure 1) and a high position (closed position shown in Figure 4). Its length is provided so that, in the low position, its lower end called the connection 300i is located slightly below the level of the shutter valve 11 and that, in its high position, this lower connection end retracts above the level of said valve.

Dans la position basse, ladite extrémité inférieure de connexion 300i vient s'accoupler avec un manchon d'accrochage inférieur 303 dont le rôle est d'assurer le maintien d'un train de tubes inférieurs (représenté en Ti en traits discontinus à la figure 1) à l'intérieur desquels passe le gaz injecté. A cet effet, le manchon d'accrochage inférieur 303 est doté à sa partie basse d'un filetage à droite, autour duquel vient se visser le dernier tube Ti du train inférieur.In the low position, said lower connection end 300i is coupled with a lower hooking sleeve 303 whose role is to maintain a train of lower tubes (shown in Ti in broken lines in FIG. 1). ) inside which the injected gas passes. To this end, the lower attachment sleeve 303 is provided at its lower part with a right-hand thread, around which the last tube Ti of the lower train is screwed.

Le manchon d'accrochage 303 est assujetti à la base du corps de vanne sur le corps d'obturateur 8, grâce à des bras radiaux 304, en l'exemple au nombre de trois (figure 8), qui sont répartis autour dudit manchon et dont les extrémités périphériques sont solidaires d'une base annulaire 305 formant le nez de vanne.The attachment sleeve 303 is secured to the base of the valve body on the shutter body 8, by means of radial arms 304, three in example (FIG. 8), which are distributed around said sleeve and the peripheral ends of which are integral with an annular base 305 forming the valve nose.

En l'exemple, cette pièce 305 est vissée sur le corps d'obturateur (par un filetage à droite). Le cas échéant, elle pourrait être réalisée d'un seul tenant avec ce corps (l'ensemble corps 8/pièce 305/bras 304/manchon 303 étant constitué par une seule pièce venue de fonderie).In the example, this part 305 is screwed onto the shutter body (by a right-hand thread). If necessary, it could be made in one piece with this body (the body 8 / part 305 / arm 304 / sleeve 303 assembly being constituted by a single piece from the foundry).

Le manchon d'accrochage inférieur 303 est équipé à son extrémité supérieure d'une portée conique rapportée 306, ménagée sur un court tronçon de tube vissé dans le manchon 303 avec interposition d'un joint d'étanchéité 307. Ce tronçon de tube est en un matériau synthétique tel que polyamide, apte à assurer une étanchéité au contact du tube in terne 300 lorsque ce dernier se trouve en position basse ; l'extrémité inférieure de connexion 300i dudit tube interne est taillée à une forme conique conjuguée de la portée 306 afin de réaliser la connexion étanche.The lower attachment sleeve 303 is equipped at its upper end with an added conical bearing 306, formed on a short section of tube screwed into the sleeve 303 with the interposition of a seal 307. This section of tube is a synthetic material such as polyamide, capable of ensuring a seal in contact with the internal tube 300 when the latter is in the low position; the lower connection end 300i of said internal tube is cut to a conjugate conical shape of the bearing 306 in order to make the sealed connection.

Par ailleurs, en partie haute, la vanne est équipée d'un système d'ancrage mécanique à sollicitation hydraulique, qui comprend essentiellement le corps de verrou 2, des chiens d'ancrage 54, une douille de verrouillage 55 et un piston-baladeur 58.Furthermore, in the upper part, the valve is equipped with a mechanical anchoring system with hydraulic stress, which essentially comprises the lock body 2, anchoring dogs 54, a locking sleeve 55 and a sliding piston 58 .

Le corps de verrou est vissé par un filetage à droite 50 sur le tronçon contigu du corps de vanne (constitué par le porte-joint supérieur 3). Son extrémité basse 51 c forme intérieurement une saillie appelée à servir de butée pour le piston-baladeur 58 en position haute.The lock body is screwed by a right-hand thread 50 on the contiguous section of the valve body (constituted by the upper seal holder 3). Its lower end 51 c internally forms a projection intended to serve as a stop for the sliding piston 58 in the high position.

Ce corps de verrou est composé de deux pièces tubulaires, inférieure 51 et supérieure 52, qui sont vissées dans le prolongement l'une de l'autre par des filets à gauche 308. Ces filets qui sont de pas opposé à celui de tous les autres filetages de la vanne permettent par une rotation à droite de libérer les deux pièces 51 et 52 afin de remonter la vanne, comme on le verra plus loin.This lock body is composed of two tubular parts, lower 51 and upper 52, which are screwed in the extension of one another by left-hand threads 308. These threads which are of not opposite to that of all the others valve threads allow by a clockwise rotation to release the two parts 51 and 52 in order to reassemble the valve, as will be seen below.

La pièce inférieure 51 est dotée de chiens flottants tels que 54, qui sont logés dans des lumières de guidage de celle-ci. En l'exemple représenté à la figure 6, ces chiens sont au nombre de quatre répartis autour de ladite pièce. Chaque chien formé par un dé est une pièce mécanique compacte, sans risque de cassure, et possède des chanfreins externes supérieur et inférieur, et interne inférieur, de façon à pouvoir jouer radialement lorsque la douille de verrouillage 55 ou le manchon-réceptacle 1 vient en appui contre l'un de ces chanfreins. De plus, des épaulements 54a, prévus latéralement à l'intérieur de chaque chien, interdisent l'échappement complet vers l'extérieur de chaque chien en venant en butée contre la pièce 51 du corps de verrou. Chaque chien peut ainsi faire saillie du corps de verrou comme le représentent les figures 1 et 6 (position d'ancrage) ou au contraire s'escamoter dans celui-ci (comme représenté aux figures 9 ou 10).The lower part 51 is provided with floating dogs such as 54, which are housed in guide lights thereof. In the example shown in Figure 6, these dogs are four in number distributed around said part. Each dog formed by a die is a compact mechanical part, without risk of breakage, and 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. In addition, 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 project from the lock body as shown in Figures 1 and 6 (anchoring position) or on the contrary retract therein (as shown in Figures 9 or 10).

La pièce inférieure 51 du corps de verrou comporte un épaulement d'arrêt 51 a, qui est situé au-dessous et à proximité des chiens 54. Cet épaulement présente la forme d'une rampe conique orientée vers le bas, de façon à venir au contact de la face inférieure conique 1 bi de la gorge d'ancrage 1 b lorsque la vanne est descendue dans le manchon-réceptacle 1. Le corps de verrou présente, au-dessus de cet épaulement 51 a, un diamètre légèrement plus grand qu'au-dessous de celui-ci, l'alésage du manchon-réceptacle 1 ayant des formes conjuguées. Ainsi, lors de la mise en place, 1a descente de la vanne dans le tube de production est arrêtée lorsque son épaulement 51 a vient au contact de la face inférieure 1bi de la gorge d'ancrage, les chiens 54 se trouvant alors en regard de ladite gorge.The lower part 51 of the lock body has a stop shoulder 51 a, which is located below and near the dogs 54. This shoulder has the shape of a conical ramp oriented downwards, so as to come to the contact of the conical underside 1 bi of the anchoring groove 1 b when the valve is lowered into the receptacle sleeve 1. The lock body has, above this shoulder 51 a, a diameter slightly larger than below it, the bore of the receptacle sleeve 1 having conjugate shapes. Thus, during installation, the descent of the valve into the production tube is stopped when its shoulder 51a comes into contact with the lower face 1bi of the anchoring groove, the dogs 54 then being located opposite said throat.

En outre, la pièce inférieure 51 du corps de verrou est intérieurement dotée au-dessous du niveau des chiens, d'un épaulement d'accrochage 51 b présentant la forme d'une rampe conique orientée vers le bas. Comme on le verra plus loin, cet épaulement permet l'accrochage de la douille de verrouillage 55 à la pièce 51 en cas de séparation par dévissage des pièces 51 et 52.In addition, the lower part 51 of the lock body is internally provided below the level of the dogs, with a hooking shoulder 51 b 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 separation by unscrewing the parts 51 and 52.

De plus, la pièce supérieure 52 comprend également une face interne 52b qui présente la forme d'une rampe conique orientée vers le bas, adaptée pour servir de butée extrême à la douille de verrouillage 55.In addition, the upper part 52 also includes an internal face 52b which has the form of a conical ramp oriented downwards, adapted to serve as an extreme stop for the locking sleeve 55.

La pièce supérieure 52 comprend enfin un épaulement interne 52c qui présente la forme d'une rampe conique orientée vers le haut, en vue de permettre un accrochage de ladite pièce supérieure 52 sur la douille de verrouillage 55 après dévissage des pièces 51 et 52.The upper part 52 finally comprises an internal shoulder 52c which has the shape of a conical ramp facing upwards, with a view to allowing said upper part 52 to be hooked onto the locking sleeve 55 after unscrewing the parts 51 and 52.

Le déplacement radial des chiens 54 vers leur position d'ancrage et le verrouillage de ceux-ci dans cette position sont assurés par la douille de verrouillage 55 déjà évoquée, cette douille étant déplacée longitudinalement à cet effet par le piston-baia- deur 58.The radial movement of the dogs 54 towards their anchoring position and the locking of these in this position are ensured by the locking bush 55 already mentioned, this bush being displaced longitudinally for this purpose by the piston-diverter 58.

Ladite douille de verrouillage 55 en équipression est montée coulissante dans le corps de verrou avec interposition d'un joint de freinage 59 à l'interface douille/pièce inférieure 51 ; la douille est indépendante du piston-baladeur 58 qui peut uniquement exercer sur celle-ci une poussée vers le haut. Ladite douille de verrouillage 55 possède une came périphérique 56 qui est adaptée pour repousser radialement les chiens 54 vers l'extérieur lorsqu'elle parvient au niveau de ceux-ci.Said locking sleeve 55 in equipression is slidably mounted in the lock body with interposition of a braking joint 59 at the interface sleeve / lower part 51; the sleeve is independent of the wandering piston 58 which can only exert on it an upward thrust. Said locking sleeve 55 has a peripheral cam 56 which is adapted to push the dogs 54 outward radially when it reaches their level.

Cette came 56 possède une face supérieure 56a, qui présente la forme d'une rampe conique orientée vers le haut, de façon à pouvoir repousser les chiens 54 lorsqu'elle rentre en contact avec ceux-ci. De plus, cette face supérieure 56a limite la course de la douille 55 en venant le cas échéant en butée contre la face interne 52b de la pièce supérieure 52.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. In addition, this upper face 56a limits the stroke of the sleeve 55, if necessary abutting against the internal face 52b of the upper part 52.

La douille de verrouillage 55 est en outre pourvue d'un épaulement d'accrochage 55a, situé au-dessous du niveau de sa came 56 et conjugué de l'épaulement d'accrochage 51 b de la pièce 51 de façon à pouvoir coopérer avec ce dernier après dévissage des pièces 51 et 52 et dégagement vers le haut de la came 56 par rapport aux chiens 54 : la pièce 51 se trouve alors accrochée à la douille 55.The locking sleeve 55 is further provided with a hooking shoulder 55a, located below the level of its cam 56 and conjugated with the hooking shoulder 51b of the part 51 so as to be able to cooperate with this last after unscrewing the parts 51 and 52 and clearing up the cam 56 relative to the dogs 54: the part 51 is then hooked to the socket 55.

De plus, la douille de verrouillage 55 est extérieurement pourvue en partie haute d'un accrochage périphérique 57, constitué en l'exemple par une bague vissée autour de celle-ci. Cette bague présente une face inférieure conique 57a, adaptée pour pouvoir venir en contact avec l'épaulement interne 52c de la pièce supérieure 52 du corps de verrou, en vue de réaliser un accrochage de ladite pièce supérieure sur ladite douille après dévissage des pièces 51 et 52.In addition, 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 latch body, with a view to attaching said upper part to said bushing after unscrewing the parts 51 and 52.

Par ailleurs, le piston-baladeur 58 qui est appelé à déplacer la douille de verrouillage 55 vers sa position haute d'ancrage est formé par un tronçon de tube, adapté pour pouvoir librement coulisser de façon étanche entre le corps de vanne (partie haute du porte-joint 3) et l'extrémité supérieure du coulisseau 9.Furthermore, 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 freely in leaktight manner between the valve body (upper part of the seal holder 3) and the upper end of the slide 9.

Ce piston-baladeur 58 est pourvu des joints d'étanchéité déjà évoqués, interne 21 à l'interface coulisseau/piston-baladeur, et externe 24 à l'interface piston-baladeur/corps de vanne ; ces joints qui limitent en partie haute le volume étanche contenant le fluide de commande sont de diamètres différents de façon à définir une surface par laquelle le piston-baladeur est soumis à la pression du fluide de commande en vue d'engendrer son déplacement vers le haut. Il est à noter que le piston-baladeur 58 est libre de coulisser sous l'effet des pressions hydrauliques en l'absence de tout blocage mécanique.This sliding piston 58 is provided with the seals already mentioned, internal 21 at the slide / piston-sliding interface, and external 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 . It should be noted that the sliding piston 58 is free to slide under the effect of hydraulic pressures in the absence of any mechanical blocking.

Ainsi, dans la vanne conforme à l'invention, le fluide de commande agit en premier lieu sur le piston-baladeur 58 pour tendre à le déplacer vers le haut depuis une position basse où celui-ci se trouve en butée contre un épaulement 3b du porte-joint 3 (figure 4) vers une position haute où ledit piston-baladeur vient en butée contre la saillie 51c que forme l'extrémité basse de la pièce 51 (figures 1 et 3). Au cours de son déplacement, le piston-baladeur repousse la douille de verrouillage 55 amenant la came 56 de celle-ci à manoeuvrer radialement les chiens 54 et à les verrouiller.Thus, in the valve according to the invention, the control fluid acts first on the sliding piston 58 to tend to move it upwards from a low position where it is in abutment against a shoulder 3b of the seal carrier 3 (Figure 4) to an upper position where said sliding piston abuts against the projection 51c formed by the lower end of the part 51 (Figures 1 and 3). During its movement, 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.

D'autre part, le fluide de commande agit sur le coulisseau 9 pour tendre à le déplacer vers le bas, depuis sa position haute d'obturation (figure 4) où la bague-écrou 19 vient en butée supérieure contre le talon 6a de la chemise de ressort 6, vers une position basse d'ouverture (figure 1) où ledit coulisseau vient en butée contre l'épaulement 8a du corps d'obturation 8.On the other hand, the control fluid acts on the slide 9 to tend to move it downwards, from its high closed position (FIG. 4) where the nut ring 19 comes into upper abutment against the heel 6a of the spring jacket 6, towards a low open position (FIG. 1) where said slide comes into abutment against the shoulder 8a of the closure body 8.

Par ailleurs, le tube interne 300 qui permet l'injection de gaz sous pression pénètre en partie haute dans un manchon d'accrochage supérieur 309 qui possède un alésage 309a muni d'un joint d'étanchéité 310, calibré pour permettre un coulissement étanche de l'extrémité supérieure dudit tube interne 300. La longueur du tube 300 est telle que son extrémité supérieure reste en permanence étanchément engagée dans cet alésage quelle que soit sa position haute ou basse.Furthermore, the internal tube 300 which allows the injection of gas under pressure penetrates at the top into an upper attachment sleeve 309 which has a bore 309a provided with a seal 310, calibrated to allow a tight sliding of the upper end of said internal tube 300. The length of the tube 300 is such that its upper end remains permanently sealed in this bore regardless of its high or low position.

A sa partie haute, le manchon est taraudé à droite pour permettre d'y visser le premier tube Ts d'un train de tubes supérieurs (traits discontinus à la figure 1).At its upper part, the sleeve is tapped on the right to allow the first tube Ts of a train of upper tubes to be screwed into it (broken lines in FIG. 1).

Le manchon d'accrochage supérieur 309 est assujetti en tête du corps de vanne, sur la pièce supérieure 52 du corps de verrou, par des bras radiaux 311, en l'exemple au nombre de trois, répartis autour dudit manchon (figure 5). L'extrémité périphérique de ces bras est solidaire d'une tête de fixation annulaire 313 vissée par des filets à droite sur la pièce supérieure 52.The upper attachment sleeve 309 is fixed at the head of the valve body, on the upper part 52 of the lock body, by radial arms 311, in the example three in number, distributed around said sleeve (FIG. 5). The peripheral end of these arms is integral with an annular fixing head 313 screwed by threads on the right on the upper part 52.

La structure de la vanne conforme à l'invention ayant été décrite en détail, on va préciser ci-après les procédures de pose et de dépose.The structure of the valve according to the invention having been described in detail, the installation and removal procedures will be explained below.

La pose et l'ancrage de la vanne sont réalisés de la façon suivante (figure 9).The installation and anchoring of the valve are carried out as follows (Figure 9).

La vanne étant hors pression, son coulisseau 9 se trouve en position haute par l'action du ressort de rappel 10 ; le tube interne 300 solidarisé au coulisseau 9 se trouve lui-même en position haute. Le clapet 11 est fermé. De plus, le piston-baladeur 58 et la douille de verrouillage 55 sont en position basse, les chiens 54 étant libres de s'effacer.The valve being depressurized, its slide 9 is in the high position by the action of the return spring 10; the internal tube 300 secured to the slide 9 is itself in the high position. The valve 11 is closed. In addition, the sliding piston 58 and the locking sleeve 55 are in the low position, the dogs 54 being free to fade.

Un train de tubes inférieurs Ti dont la longueur peut aller jusqu'à 3 000 mètres est d'abord descendu dans le puits de façon traditionnelle au moyen d'outils à mâchoires classiques. On visse la vanne par son manchon d'ancrage inférieur 303 sur l'extrémité haute du train de tubes inférieurs ; on visse ensuite le manchon d'ancrage supérieur 309 sur l'extrémité basse d'un autre train de tubes Ts et l'ensemble est descendu au moyen des outils à mâchoires classiques. Le train de tubes supérieurs Ts possède généralement une longueur de l'ordre de 100 à 150 mètres.A train of lower tubes Ti, the length of which can go up to 3,000 meters, is first lowered into the well in the traditional way using conventional jaw tools. The valve is screwed by its lower anchoring sleeve 303 on the upper end of the train of lower tubes; the upper anchoring sleeve 309 is then screwed onto the lower end of another train of tubes Ts and the assembly is lowered using conventional jaw tools. The upper tube train Ts generally has a length of the order of 100 to 150 meters.

La vanne pénètre dans le manchon-réceptacle 1 du tube de production du puits ; l'effort d'engagement des garnitures 15 et 16 est vaincu par le poids du train de tubes inférieurs (plusieurs tonnes). Les chiens 54 de la vanne qui sont flottants, s'effacent à l'entrée du manchon-réceptacle.The valve enters the receptacle sleeve 1 of the well production tube; the engagement force of the linings 15 and 16 is overcome by the weight of the train of lower tubes (several tonnes). The dogs 54 of the valve which are floating, are erased at the inlet of the receptacle sleeve.

L'engagement dans le manchon-réceptacle se poursuit jusqu'à ce que la vanne soit arrêtée par l'épaulement d'arrêt 1 bi dudit manchon-réceptacle, contre lequel vient en butée l'épaulement d'arrêt 51 a de celle-ci (figure 9).The engagement in the receptacle sleeve continues until the valve is stopped by the stop shoulder 1 bi of said receptacle sleeve, against which the stop shoulder 51 a abuts therefrom. (figure 9).

On pressurise alors le circuit de fluide de commande ; l'huile pénètre dans le volume étanche décrit précédemment et monte en pression. Le piston-baladeur 58 de la vanne est soumis à une force vers le haut et monte en repoussant la douille de verrouillage 55 jusqu'à sa position haute. Au cours de son déplacement, la douille manoeuvre radialement les chiens 54 et les verrouille à l'intérieur de la gorge d'ancrage 1b. La vanne se trouve à cet instant ancrée dans la position représentée à la figure 4 (à l'exception toutefois du piston-baladeur qui se trouve en position haute).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 radially maneuvers the dogs 54 and locks them inside the anchoring groove 1b. The valve is at this time anchored in the position shown in FIG. 4 (with the exception, however, of the sliding piston which is in the high position).

La pression de l'huile continue à monter jusqu'à vaincre la force de rappel du ressort 10 : le coulisseau 9 se déplace alors vers le bas et l'organe d'obturation 11 est repoussée vers la position d'ouverture (figure 1).The oil pressure continues to rise until overcoming the return force of the spring 10: the slide 9 then moves downwards and the shutter member 11 is pushed back to the open position (FIG. 1) .

Le tube interne 300 descend avec le coulisseau 9 et, en fin de course basse, vient coopérer avec la portée conique 306 du manchon d'ancrage inférieur 303, cependant qu'en partie haute, l'extrémité supérieure dudit tube interne a coulissé dans le manchon d'ancrage supérieur 309 demeurant étanchément engagée dans celui-ci.The internal tube 300 descends with the slide 9 and, at the end of the lower stroke, comes to cooperate with the conical bearing 306 of the lower anchoring sleeve 303, while in the upper part, the upper end of said internal tube has slid in the upper anchoring sleeve 309 remaining tightly engaged therein.

La vanne est ouverte et la continuité du circuit de fluide injecté est assurée.The valve is open and the continuity of the injected fluid circuit is ensured.

Pour vérifier si la vanne est correctement ancrée, il suffit d'opérer sur les tubes supérieurs Ts une traction supérieure au poids de l'ensemble ; les chiens 54, s'ils sont correctement ancrés et verrouillés, viennent buter contre la face supérieure 1 bs de la gorge d'ancrage. L'ensemble est alors dans l'impossibilité de remonter : un appareillage de mesure permet alors de constater l'absence rigoureuse de déplacement alors que l'effort exercé est très supérieur au poids des trains de tubes et de la vanne.To check whether the valve is correctly anchored, it suffices to operate on the upper tubes Ts a traction greater than the weight of the assembly; dogs 54, if they are properly anchored and locked, abut against the upper face 1 bs of the anchoring groove. The assembly is then unable to go back up: a measuring device then makes it possible to note the rigorous absence of displacement while the force exerted is much greater than the weight of the trains of tubes and of the valve.

En cas de mauvais ancrage, l'ensemble remonte dans le puits et le défaut pourra être décelé en surface. La vanne de l'invention offre donc la faculté de s'assurer, à chaque mise en place, que l'ancrage a été correctement obtenu, un mauvais ancrage pouvant provenir de multiples causes : détérioration des garnitures d'étanchéité 15 et 16 en cours de descente ou détérioration du manchon-réceptacle 1 au niveau desdites garnitures (interdisant une mise en pression du fluide de commande), dépôt dû à l'effluent dans la gorge d'ancrage 1b, (empêchant la sortie des chiens 54)...In the event of poor anchoring, the assembly rises in the well and the fault can be detected on the surface. The valve of the invention therefore offers the ability to ensure, at each installation, that the anchoring has been correctly obtained, poor anchoring can come from multiple causes: deterioration of the seals 15 and 16 in progress lowering or deterioration of the receptacle sleeve 1 at said linings (preventing pressurization of the control fluid), deposition due to the effluent in the anchoring groove 1b, (preventing the dogs from leaving 54) ...

Par ailleurs, la vanne une fois correctement ancrée dans le puits pétrolier peut être refermée de façon classique par une purge volontaire ou accidentelle de sa ligne de commande hydraulique et arrêt du gaz injecté. Elle vient alors dans la position de la figure 4. Le ressort de rappel 10 a entraîné un déplacement vers le haut du coulisseau 9 et du tube interne 300 qui lui est lié, libérant l'organe d'obturation 11 lequel se referme sous l'action de son ressort propre 12 aidé par la pression du puits (pressurisé par le gaz déjà injecté).Furthermore, the 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 and stopping of the injected gas. It then comes into the position of FIG. 4. The return spring 10 has caused an displacement upwards of the slide 9 and of the internal tube 300 which is linked to it, releasing the shutter member 11 which closes under the action of its own spring 12 aided by the pressure of the well (pressurized by the gas already injected).

Une fois la vanne fermée, le puits ne débite plus, mais les pressions sont équilibrées au-dessus et au-dessous de l'organe 11 tant que le tube de production n'est pas purgé dans son tronçon supérieur. La pression qui règne dans ce dernier agit sur le piston-baladeur 58 qui redescend dans sa position basse ; toutefois, la douille 55 rest en place grâce à la dureté du joint de freinage 59.Once the valve is closed, the well no longer flows, but the pressures are balanced above and below the member 11 as long as the production tube is not purged in its upper section. The pressure prevailing in the latter acts on the sliding piston 58 which descends to its low position; however, the socket 55 remains in place thanks to the hardness of the brake seal 59.

Lorsque l'on effectue la purge du tronçon supérieur du tube de production, la pression amont du puits s'applique sur la section complète de la vanne ; les chiens 54 de la vanne viennent alors s'appliquer contre la face supérieure conique 1 bs de la gorge d'ancrage 1b, ce qui conditionne un effet de verrouillage de la douille 55 d'autant plus puissant que la pression du puits est élevée : la vanne bénéficie d'un auto-verrouillage proportionnel à la pression du puits.When purging the upper section of the production tube, the upstream pressure from the well is applied to the entire section of the valve; the dogs 54 of the valve then come to apply against the conical upper face 1 bs of the anchoring groove 1b, which conditions a locking effect of the sleeve 55 all the more powerful as the pressure of the well is high: the valve benefits from a self-locking proportional to the pressure of the well.

La réouverture de la vanne est réalisée, d'abord en injectant dans les tubes supérieurs Ts et tube interne 300 du gaz sous pression afin d'équilibrer la pression de part et d'autre du clapet, puis en mettant à nouveau en pression la ligne de commande hydraulique : le piston-baladeur 58 remonte contre la douille 55 et contre sa butée 51 et l'ouverture se produit comme précédemment expliqué par déplacement du coulisseau 9 et du tube interne 300 vers le bas sous la pression du fluide de commande. Par ailleurs, le désancrage et la remontée de la vanne conforme à l'invention sont réalisés de la façon suivante (figure 10).The valve is reopened, first by injecting pressurized gas into the upper tubes Ts and internal tube 300 in order to balance the pressure on either side of the valve, then putting the line back into pressure hydraulic control: the sliding piston 58 rises against the sleeve 55 and against its stop 51 and the opening occurs as previously explained by displacement of the slide 9 and the internal tube 300 downward under the pressure of the control fluid. Furthermore, the disengaging and the raising of the valve according to the invention are carried out as follows (FIG. 10).

La ligne de commande hydraulique étant purgée et l'injection de gaz stoppée, le puits est mis en sécurité, c'est-à-dire dans l'impossibilité de débiter (grâce à un équilibrage préalable par pompage d'eau). Le train supérieur de tubes est ensuite amené à tourner à droite par des clés standards de façon à dévisser le filetage à gauche 308 qui lie la pièce supérieure 52 du corps de verrou et la pièce inférieure 51. Lorsque ces deux pièces sont désolidarisées, on assure une traction sur le train de tubes supérieurs, ce qui a pour effet d'amener l'épaulement 52c de la pièce supérieure au contact avec l'épaulement 57a de la douille de verrouillage 55.The hydraulic control line being purged and the gas injection stopped, the well is put in safety, that is to say in the impossibility of debiting (thanks to a preliminary balancing by pumping water). The upper train of tubes is then caused to turn to the right by standard keys so as to unscrew the left-hand thread 308 which connects the upper part 52 of the lock body and the lower part 51. When these two parts are separated, it is ensured traction on the train of upper tubes, which has the effect of bringing the shoulder 52c of the upper part into contact with the shoulder 57a of the locking sleeve 55.

En conséquence, cette douille de verrouillage 55 remonte jusqu'à ce que son épaulement 55a vienne en appui contre l'épaulement 51 b de la pièce inférieure du corps de verrou. Les chiens 54 sont alors libérés et peuvent s'effacer vers l'intérieur : la poursuite de la traction engendre la remontée de la vanne jusqu'au déboîtement des garnitures d'étanchéité 15 et 16, la vanne pouvant ensuite être remontée en surface.Consequently, this locking sleeve 55 rises until its shoulder 55a comes to bear against the shoulder 51b of the lower part of the lock body. The dogs 54 are then released and can fade inwards: the continuation of the traction causes the valve to rise up to the disengagement of the seals 15 and 16, the valve then being able to be raised to the surface.

Claims (13)

1. Safety valve designed to be installed into an oil well production pipe in view of ensuring its opening or closing while allowing for artificial flow operation through injection of a fluid under pressure, a so- called injected fluid, with the aforesaid valve comprising, in combination:
- one valve body displaying a generally tubular shape,
- one mobile shutter (11) located in the lower section of the aforesaid body and forced into its closed position,
- one tubular slide (9) designed to slide in a longitudinal direction inside the valve body in view of bringing about, in its descending movement, the opening of the shutter,
- one return spring (10) arranged in a ring-shaped housing located between the slide and the valve body so as to force the aforesaid slide towards a high position that corresponds to the closing of the shutter,
- means for lowering the slide hydraulically and that comprise a control fluid intake (3a, 4a) through the valve body and a sealed space between the slide and the body, designed for containing the control fluid, with the slide displaying a cross section difference subjected to the pressure of the fluid contained in the aforesaid fluid space in such a manner as to be exposed to a downward thrust when the aforesaid space is under pressure,
- lower (16) and upper (15) gaskets arranged around the valve body in view of providing a tight seal at the interface between said valve body and a receptacle sleeve (1) that fits the production tube at levels above and underneath the control fluid intake,
- injected fluid throughflow internal pipe (300) that displays a diameter smaller than that. of the tubular slide (9) and is lodged inside the latter, with the aforesaid internal pipe being fitted to the slide by fastening means (301, 302) and possessing a low connection end (300i) and a length such that the aforesaid low connection end finds itself located above the shutter (11) when the slide is in high position and underneath the aforesaid shutter when the aforesaid slide is in low position,
- one lower hitch sleeve (303) fitted to the base of the valve body and designed to allow for fastening lower pipes for the throughflow of the injected fluid (Ti) with the aforesaid lower hitch sleeve possessing an upper end (306) combined with the lower connecting end (300i) of the internal pipe in such a manner as to allow for linking these ends tightly together while allowing for their release by shifting them in the direction that moves them apart,
- one upper hitch sleeve (309) fitted at the head of the valve body and designed to allow for fastening upper pipes for the throughflow of the injected fluid (Ts), with the aforesaid upper hitch sleeve displaying an inner boring (309a) designed to allow for sealed sliding of the upper end of the inner pipe (300),
- one hydraulically actuated mechanical anchoring system located in the high section of the valve body underneath the upper hitch sleeve (309) and designed to allow for securing the valve body in the receptacle sleeve (1) lodged in the production pipe, characterized in that the aforesaid system comprises:
. means (1bi, 51 a) for stopping the valve body in the aforesaid receptacle sleeve,
. dogs (54) that are radially mobile so that they can penetrate, in the top position, into an anchoring groove (1 b) of the receptacle sleeve,
. one tubular sliding piston (58) installed in a sliding assembly so as to be able to move freely in the valve body, around the upper section of the slide (9), between a low stop position and a high stop position, in the absence of any mechanical blocking over the height of its run, with the aforesaid sliding piston designed to display a surface area subjected to the pressure of the control fluid contained in the sealed space in such a manner as to become subjected to an upward thrust when the aforesaid space is under pressure,
. one balanced pressure locking socket (55) assembled slidingly in the valve body above the sliding piston (58) but independently from the latter, so that the aforesaid sliding piston is enabled to apply only to the aforesaid socket an upward thrust without any possibility of pulling it downwards, with the aforesaid socket displaying a peripheral cam (56) designed to engage the dogs (54) and thrust the latter radially into the high position of the sliding piston
2. Safety valve according to claim 1, in which the sealed space for the control fluid is restricted, in the high section of the valve, on one hand, by a gasket seal (24) located at the sliding piston/valve body interface and, on the other hand, by a smaller diameter gasket seal (21) located at the slide/sliding piston interface, with the difference in diameter of the aforesaid gasket seals defining the sliding piston surface area against which the control fluid is applying an upward thrust.
3. Safety valve according to claim 1 or 2, in which:
. the valve body consists in the high section of a tubular lock body (51, 52) screwed onto the lower contiguous portion (3) of the aforesaid valve body,
. the sliding piston (58) is installed in the aforesaid lower contiguous portion (3), with the low end (51c) of the lock body forming inside a stop projection of the sliding piston in high position,
. the locking socket (55) is assembled slidingly in the lock body so as to be able to rest against the upper end of the sliding piston (58).
4. Safety valve according to claim 3, in which:
. the valve body consists of several tubular parts (3, 6, 7, 8) screwed one into the extension of the others through right-handed threads,
. the lock body is composed of two tubular parts (51, 52) screwed one into the extension of the other through lefthanded threads, with the lower part (51) containing the dogs (54) and being screwed onto the lower contiguous portion (3) of the valve body through right-handed threads whereas the upper part (52) is fitted in the high section with a fastening head (312) of the upper hitch sleeve (309).
5. Safety valve according to claim 4, in which:
. the locking socket (55) is provided with a hitch shoulder (55a) located underneath the level of its cam (56),
. the lower part (51) of the lock body is provided inside, underneath the level of the dogs (54), with a hitch shoulder (51 b) paired with that of the socket (55),
. the aforesaid hitch shoulders (55a, 51b) are designed to enable them to cooperate, following the upward release of the cam (56) from the dogs (54), in view of achieving, in this position, the hitching of the lower part (51) to the socket (55).
6. Safety valve according to one of the claims 4 or 5, characterized in that the locking socket (55) is provided outside, in the high section, with a peripheral hitch (57), designed to come into contact with an internal shoulder (52c) provided in the upper part (52) of the lock body, in view of achieving the hitching of the aforesaid upper part to the socket, subsequent to the unscrewing of this upper part from the lower part (51) of the lock body.
7. Safety valve according to the claims 4, 5 or 6, in which the upper part (52) of the lock body is provided with an inner face (52b) designed to be able to serve as an outer stop for the upper face (56a) of the cam (56) of the locking socket (55).
8. Safety valve according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that the fastening means of the inner pipe (300) in the slide (9) comprise several radial fins (302) distributed around the aforesaid inner pipe and fitted to the latter, one concentric ring (301) at the aforesaid inner pipe and fitted to the peripheral ends of the aforesaid fins, and one recess (9a) made in the slide (9) for the purpose of containing and securing the aforesaid ring.
9. Safety valve according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the lower hitch sleeve (303) displays at its upper end an attached cone- shaped bearing surface (306) made of a material suitable for ensuring a tight seal in contact with the inner pipe (300), with the aforesaid inner pipe displaying a lower connection end (300i) of paired conical shape.
10. Safety valve according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, in which the lower hitch sleeve (303) is secured to the base of the body of the valve through radial arms (304) distributed around the aforesaid sleeve, with the peripheral end of the aforesaid arms being fitted to a ring-shaped base (305) that is forming the valve nose.
11. Safety valve according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, in which the upper hitch sleeve (309) is secured at the head of the body of the valve through radial arms (311) distributed around the aforesaid sleeve, with the peripheral end of the aforesaid arms fitted to a ring-shaped fastening head (312) screwed to the upper part (52) of the lock body, with the inner boring (309a) of the aforesaid hitch sleeve being provided with a gasket seal (310) and sized so as to allow for the sliding of the upper end of the inner pipe (300).
12. Safety valve according to one of the claims above, in which the gasket seals (15, 16) located on each side of the control fluid intake (3a, 4a) are positioned directly underneath and above the aforesaid fluid intake, with the anchoring system located above the upper gasket (15) whereas the return spring (10) is positioned underneath the lower gasket (16) in a ring-shaped housing constituted by part of the sealed space designed to contain the control fluid.
13. Safety valve according to claim 12, in which the return spring (10) installed in the ring-shaped housing arranged around the slide (9) extends between, on one hand, an upper bearing surface (19) fitted to the slide and, on the other hand, a lower socket (20) assembled slidingly around the aforesaid slide, with a lower stop (9c) that restricts its downward run in relation to the aforesaid slide, with the socket coming to rest in the low section against a shoulder (7a) provided inside the valve body.
EP87201966A 1986-10-16 1987-10-13 Oil well safety valve adapted to artificial lifting Expired - Lifetime EP0267638B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8614503 1986-10-16
FR8614503A FR2605381B1 (en) 1986-10-16 1986-10-16 SAFETY VALVE FOR OIL WELLS, ALLOWING ARTIFICIAL FLOW OPERATION

Publications (2)

Publication Number Publication Date
EP0267638A1 EP0267638A1 (en) 1988-05-18
EP0267638B1 true EP0267638B1 (en) 1990-07-18

Family

ID=9339973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201966A Expired - Lifetime EP0267638B1 (en) 1986-10-16 1987-10-13 Oil well safety valve adapted to artificial lifting

Country Status (5)

Country Link
US (1) US4836287A (en)
EP (1) EP0267638B1 (en)
CA (1) CA1330756C (en)
DE (1) DE3763801D1 (en)
FR (1) FR2605381B1 (en)

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FR2634819A1 (en) * 1988-07-29 1990-02-02 Merip Oil Tools Int Safety valve for oil wells particularly intended to be inserted in a receptacle sleeve with no stop shoulder.
FR2643127B1 (en) * 1989-02-16 1991-07-05 Merip Oil Tools Int SAFETY VALVE FOR OIL WELLS OF THE TYPE ALLOWING ARTIFICIAL FLOW OPERATION, AND METHOD FOR UNLOCKING SUCH A VALVE
US5617918A (en) * 1992-08-24 1997-04-08 Halliburton Company Wellbore lock system and method of use
US5999157A (en) * 1995-12-27 1999-12-07 Canon Kabushiki Kaisha Suppressing liquid crystal movement based on the relationship between a display pattern and a driving waveform
WO1999020869A2 (en) * 1997-10-17 1999-04-29 Camco International Inc. Equalizing subsurface safety valve with injection system
CA2338730A1 (en) * 1998-07-21 2000-02-03 Dmitry Dveyrin Method and apparatus for conveying fluids, particularly useful with respect to oil wells
US7779925B2 (en) * 2004-02-13 2010-08-24 Weatherford/Lamb, Inc. Seal assembly energized with floating pistons
GB2457288A (en) * 2008-02-08 2009-08-12 Pilot Drilling Control Ltd A drillstring connection valve
GB2435059B (en) * 2006-02-08 2008-05-07 Pilot Drilling Control Ltd A Drill-String Connector
GB2469216B (en) * 2007-12-20 2011-07-13 Cameron Int Corp System and method for snubbing under pressure
US7775291B2 (en) * 2008-05-29 2010-08-17 Weatherford/Lamb, Inc. Retrievable surface controlled subsurface safety valve
US8100181B2 (en) 2008-05-29 2012-01-24 Weatherford/Lamb, Inc. Surface controlled subsurface safety valve having integral pack-off
US8479828B2 (en) 2010-05-13 2013-07-09 Weatherford/Lamb, Inc. Wellhead control line deployment
US10323477B2 (en) 2012-10-15 2019-06-18 Weatherford Technology Holdings, Llc Seal assembly

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US4478288A (en) * 1981-10-02 1984-10-23 Baker International Corporation Apparatus with annulus safety valve for through tubing injection and method of use
FR2517358A1 (en) * 1981-12-02 1983-06-03 Petroles Cie Francaise SAFETY VALVE INSTALLED BELOW AN ACTIVATION PUMP IN A HYDROCARBON PRODUCTION WELL
FR2522359A1 (en) * 1982-02-26 1983-09-02 Petroles Cie Francaise PROCESS AND DEVICE FOR CONVERTING A PETROLEUM WELL INTO A WINDOW OF THE EFFLUENT BY GAS LIGHTENING
US4479539A (en) * 1982-10-18 1984-10-30 Otis Engineering Corporation Downhole lock system
FR2536783B1 (en) * 1982-11-29 1986-07-04 Petroles Cie Francaise SAFETY VALVE FOR OIL WELLS
FR2555246B2 (en) * 1982-11-29 1986-09-05 Petroles Cie Francaise SAFETY VALVE FOR OIL WELLS
CA1291026C (en) * 1986-07-29 1991-10-22 Diamant Boart France - Sa - Division Petrole Safety valve for oil well, and tool for mounting said valve
FR2602820B1 (en) * 1986-07-29 1991-11-22 Diamant Boart Sa SAFETY VALVE FOR OIL WELLS AND TOOLS FOR IMPLEMENTING SAID VALVE

Also Published As

Publication number Publication date
EP0267638A1 (en) 1988-05-18
FR2605381A1 (en) 1988-04-22
FR2605381B1 (en) 1989-01-13
US4836287A (en) 1989-06-06
DE3763801D1 (en) 1990-08-23
CA1330756C (en) 1994-07-19

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