EP0321609B1 - Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils - Google Patents

Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils Download PDF

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Publication number
EP0321609B1
EP0321609B1 EP87202599A EP87202599A EP0321609B1 EP 0321609 B1 EP0321609 B1 EP 0321609B1 EP 87202599 A EP87202599 A EP 87202599A EP 87202599 A EP87202599 A EP 87202599A EP 0321609 B1 EP0321609 B1 EP 0321609B1
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EP
European Patent Office
Prior art keywords
slide
sleeve
valve body
spring
safety valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87202599A
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English (en)
French (fr)
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EP0321609A1 (de
Inventor
Jean-Luc Jacob
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MERIP OIL TOOLS INTERNATIONAL SA
Original Assignee
MERIP OIL TOOLS INTERNATIONAL SA
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Publication date
Priority to FR8611417A priority Critical patent/FR2602819B1/fr
Application filed by MERIP OIL TOOLS INTERNATIONAL SA filed Critical MERIP OIL TOOLS INTERNATIONAL SA
Priority to DE8787202599T priority patent/DE3778707D1/de
Priority to EP87202599A priority patent/EP0321609B1/de
Publication of EP0321609A1 publication Critical patent/EP0321609A1/de
Application granted granted Critical
Publication of EP0321609B1 publication Critical patent/EP0321609B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/05—Flapper valves

Definitions

  • the invention relates to a safety valve intended to be inserted into an oil well production tube in order to ensure its opening or closing.
  • the invention extends to a tool facilitating the mounting of said valve.
  • 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 generalized in particular in offshore eruptive wells.
  • the existing valves have faults.
  • the return springs are subject to corrosion or deposit effects, due to the effluent with which they are in contact.
  • certain valves such as for example those described in patent application FR 2 536 783 and request for certificate of addition FR 2 555 246, provision is made for placing the return spring in the circuit of the control fluid; however the configuration of this circuit does not allow it to be completely purged and the arrangement of the spring is such that the latter is at least partly surrounded by gases: the corrosive nature of these gases causes aging and deterioration rapid of said spring. This defect is very serious in practice, because a deterioration of the spring results in risks of non-closing of the valve if necessary.
  • the present invention proposes to provide an improved safety valve, free from the abovementioned faults.
  • An object of the invention is in particular to provide a valve in which the return spring and the moving parts are subjected to permanent lubrication of high efficiency, considerably reducing their corrosion.
  • Another objective is to eliminate any dangerous character of the valve during its disassembly, by eliminating the risks linked to the relaxation of the return spring.
  • Another objective is to provide a valve of simplified structure, having a reduced number of moving parts.
  • Another objective is to provide a valve in which the seals are reduced in number and which allows easy access and change of the most exposed seals.
  • an objective of the invention is to provide a simple mounting tool for the establishment of the return spring.
  • valve according to the invention is described by assuming it to be in place in an oil well, the terms “top”, “bottom”, “upper”, “lower” referring to this position.
  • the seals located on either side of the control fluid inlet, are positioned immediately below and above said fluid inlet, the anchoring 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.
  • the structure of the valve according to the invention 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 return spring disposed in the annular housing located around the slide extends between, on the one hand, an upper support integral with the slide and, on the other hand, a lower sleeve mounted to slide around said slider, with a lower stop limiting its downward stroke relative to said slider, said bushing being applied in the lower part against a shoulder provided inside the valve body.
  • This arrangement facilitates maintenance of the valve, since the return spring remains partially compressed around the slide when the valve body is disassembled, without any risk of accidental expansion.
  • an auxiliary mounting ring is preferably interposed around the slide between the upper support thereof and the corresponding end of the spring.
  • Said auxiliary ring slidably mounted around the slider has on its periphery an imprint making it possible to immobilize it by means of a mounting tool.
  • the lower sliding sleeve mentioned above also has a similar imprint on its periphery making it possible to immobilize it by means of the mounting tool.
  • the return spring can thus, easily and without danger, be assembled and disassembled if necessary by means of an appropriate tool, of very simple structure.
  • the invention extends to such a mounting tool essentially comprising a frame extending along an axis, two members with retractable lugs, mounted on said frame at different levels and adapted to be able to maintain the socket and the auxiliary ring of the valve, and a clamping rod provided with support members on said sleeve and said ring for the compression of the valve spring.
  • the safety valve shown by way of example in FIGS. 1 to 6 is intended to equip an oil well production tube provided with a receptacle sleeve 1.
  • this receptacle sleeve is provided with a line d arrival of control fluid 1a, an anchoring groove 1b and stop means of the valve (shoulder 1bi).
  • the valve comprises a valve body of generally tubular shape, consisting of several tubular parts secured to each other: upper latch body 2, upper seal holder 3, tubular spacer 4, locking nut ring 5, spring jacket 6 , lower sleeve 7, shutter body 8.
  • 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 5.
  • This slide is returned to its upper position by a return spring 10 and is hydraulically controlled downwards by the control fluid arriving via line 1a, when the latter is pressurized.
  • the shutter body 8 comprises a movable shutter member, constituted in the example by a valve 11 which is articulated on said body so as to be able to pivot between an open position retracted on the side (FIG. 1) and a closed position where said valve closes the valve body by pressing against a seal carried by it (Figure 5).
  • the valve 11 is returned to the closed position by a spring 12 disposed around its axis of articulation.
  • this shutter member known in itself, can be of another type and in particular a ball member in which the shutter is provided by a spherical part able to move longitudinally with a rotation associated, between an open position and a closed position (a spring recalling the ball to this last position).
  • the slider 9 Under the effect of the hydraulic control, the slider 9 is moved to its low position until it comes into abutment with the valve nose 8a: said slider then pushes the shutter member 11 and maintains it in the position of opening.
  • the return spring 10 causes the slide to move upwards, to its high position where it is set back in the lower sleeve 7 (FIG. 5). The shutter member 11 is then released and closes under the action of its own spring 12.
  • the lower sleeve 7 is equipped with a balancing valve 13 which is actuated, during opening, at the start of the descent of the slide, by a cam 9a of the latter, in order to allow a balancing of pressures below and beyond the shutter member 11.
  • the lock body 2 contains a dog anchoring system 14 which can be of any known type or of the type described in the FR patent application filed simultaneously by the applicant. This system, which is not the subject of the present request, will not be described in detail; when the valve is placed in the production tube, it is intended to anchor it in the receptacle sleeve 1.
  • the upper seal holder 3 is screwed to the base of the lock body 2. It is provided on the outside with a notch which opens downwards and whose shape is adapted to allow the insertion of a seal. upper 15. This lining, in particular of the herringbone type, is located immediately above a light 3a for the arrival of the control fluid, from which the upper seal carrier is pierced.
  • the gasket 15 is locked in its notch by the tubular spacer 4 which extends around the upper seal holder 3 and is itself pierced with a light 4a for the arrival of the control fluid.
  • Lights 3a and 4a are correspond and come into correspondence with the finish line 1a of the receptacle sleeve when the valve is in place in the latter.
  • the spring jacket 6 which extends around the return spring 10 is screwed onto the upper seal carrier 3 by an upper heel 6a.
  • This heel is provided externally with a notch which opens upwards and whose shape is adapted to allow the insertion of a lower sealing gasket 16.
  • This gasket in particular of the herringbone type, is thus positioned immediately below the fluid inlet lights; it is locked in its indentation by the nut ring 5 which is screwed around the upper seal holder 3.
  • This nut ring 5 also blocks the tubular spacer 4 (the lower part of which bears against the upper edge of said ring-nut); moreover, it constitutes an end of screwing stop for the heel 6a of the shirt 6.
  • This heel 6a forms at its base an internal shoulder which limits the upward movement of the slide 9 by forming a stop for its ring-nut 19 mentioned below.
  • the spring jacket 6 is screwed around the lower sleeve 7 which forms a shoulder 7a inside said shirt.
  • a seal 17 is interposed to seal the valve body at this level.
  • This spring 10 bears against an auxiliary mounting ring 19 which is mounted around the slide 9 so that it can slide along the latter.
  • This auxiliary ring has on its periphery an imprint 18a, in particular a circular groove, allowing, as will be seen below, to immobilize it during assembly.
  • the auxiliary ring 18 comes into position high in abutment against a nut-ring 19 screwed around the slider 9 which is provided for this purpose with a thread on an area of its external surface.
  • the nut ring 19 abuts against a small shoulder 9b formed on the external surface of the slide between two sections of different diameter.
  • the lower end of the spring 10 bears against a lower bush 20 mounted to slide around the slide 9.
  • a lower stop 9c limits the downward stroke of said bush 20 relative to the slide.
  • This stop 9c is formed by a shoulder formed on the external surface of the slide 9 between two sections of different diameters; the sleeve 20 has a two-section bore comprising an abutment face against said shoulder.
  • this sleeve 20 is applied against the internal shoulder 7a formed by the upper edge of the sleeve 7.
  • the sleeve 20 has on its periphery an imprint 20b, in particular a circular groove, allowing it to be immobilized during assembly, in the same way as the auxiliary ring 18.
  • control fluid consisting of a lubricating liquid
  • the control fluid arrives in the valve body by the line 1a and the ports 4a and 3a, is stopped at the valve body / sleeve-receptacle interface by the seals. 15 and 16 located immediately on either side of said inlet lights and fills a sealed volume located between the slide and the valve body, which volume is shown diagrammatically in FIG. 6.
  • This sealed volume is limited, at the slide / valve body interface, on the one hand, by an upper seal 21 disposed above the arrival of the fluid in abutment against an upper section of the slide of predetermined diameter. , 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 a lower section of the slide of more diameter larger than that of the above-mentioned upper section.
  • the lower seal 22 is arranged in a groove in the sleeve 7 so as to be positioned below and near the sleeve 20.
  • the seals 21 and 22 are in particular O-rings.
  • the upper seal 21 is arranged in a groove of a sliding piston 58 which is part of the anchoring system of the type described in the patent application filed simultaneously by the applicant; a complementary seal 24 is then provided on the external surface of said sliding piston to ensure sealing at the interface of the latter and of the valve body. (At the start of the pressurization of the control fluid, this sliding piston 58 undergoes an upward movement to a stop position, in order to achieve anchoring).
  • the sliding piston 58 does not exist, and the upper seal 21 is directly disposed in a groove in the upper seal holder 3.
  • the new valve structure described above has many advantages over traditional valves.
  • the return spring 10 and the moving parts are completely immersed in the lubricating liquid and isolated from the effluent; the configuration of the sealed volume containing the control fluid allows a purge of this volume which preserves this spring and these parts from any corrosive contact with gases.
  • the return spring and these parts are thus protected against any attack or deposit; under these conditions, the spring can be made of a steel with a high modulus of elasticity which increases its performance and allows use of the valve at greater depths.
  • the risks of breakdown at closure are considerably reduced compared to known valves.
  • valve can be dismantled without danger of relaxation of the return spring 10.
  • the spring remains trapped around it between the upper nut-ring 19 and the lower bush 20 which abuts against the shoulder 9c as shown schematically in Figure 7c.
  • the spring can itself be easily assembled or disassembled with respect to the slide by means of a mounting tool as shown in section in FIG. 7a.
  • This tool comprises a frame 25 extending along an axis, a frame constituted in the example by a tube.
  • This tubular frame is provided with organs with retractable pins such as 26 and 27 which are arranged at two different levels thereof.
  • the organs of the two levels which may consist of simple screws screwed into tapped holes in the frame, are separated by a distance slightly less than that which separates the auxiliary ring 18 and the bush 20 from the slide / spring assembly (figure 7c).
  • These screws 26 and 27 are adapted to be able to penetrate through their end into the indentations 18a and 20b of said ring and of said socket.
  • the tool comprises a clamping rod 28 provided with support washers 29 and 30 respectively on the auxiliary ring 18 and on the sleeve 20. Nuts 31, 32 are associated with these washers in order to keep them along. of the rod 28.
  • the mounting of the return spring 10 around the slide 9 is carried out as follows.
  • the sleeve 20 is introduced around the clamping rod 28 against the support member 30, 32.
  • the expanded spring is then placed above the sleeve 20.
  • the auxiliary ring 18 and the support washer 29 are then caused to cap said spring; the associated nut 31 makes it possible to compress the spring until the imprints of the sockets 20 and the ring 18 come into correspondence with the retaining screws 26 and 27.
  • valve according to the invention has a reduced number of moving parts and seals compared to known valves, which reduces manufacturing costs and simplifies maintenance.
  • seals 15 and 16 of this valve are easy to change on site without operating a complete disassembly thereof.
  • This advantage is essential in practice, because these linings are subject to friction when the valve is lowered and run a risk of deterioration during these operations.
  • the change of said linings is carried out by unscrewing the jacket 6 and the upper seal holder 13 by unscrewing, by unscrewing the nut-ring 5 and by releasing the tubular spacer 4.
  • the old linings can then be removed and new linings put in place.
  • the assembly is carried out by reverse operations.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Safety Valves (AREA)
  • Check Valves (AREA)

Claims (11)

  1. Sicherheitsventil zur Einführung in ein Erdöl-bohrungsförderrohr, um dessen Öffnen bzw. Schließen zu gewährleisten, wobei das besagte Ventil die folgenden Teile umfaßt :
    . einen Ventilkörper von im allgemeinen rohrartiger Form,
    . einen beweglichen Verschlußkörper (11), der im unteren Teil des besagten Körpers gelegen ist und in seiner Schließrichtung gepreßt wird,
    . einen rohrförmigen Schieber (9), der so beschaffen ist, daß er der Länge nach im Inneren des Ventilkörpers gleiten kann, um während seiner Abwärtsbewegung Öffnen des Schließelements zu bewirken,
    . eine in einer ringförmigen Aussparung zwischen dem Schieber und dem Ventilkörper angeordnete Rückholfeder (10), um den besagten Schieber in eine obere, dem geschlossenen Zustand des Schließelements entsprechende Lage zu pressen,
    . Mittel zu hydraulischer Abwärtsverlagerung des Schiebers, umfassend einen Steuerflüssigkeitseingang (3a, 4a), der quer durch den Ventilkörper führt, sowie einen dichten Raum zwischen dem Schieber und dem Körper zur Aufnahme der Steuerflüssigkeit, wobei der Schieber einen dem Druck der in dem besagten dichten Raum enthaltenen Flüssigkeit ausgesetzten Querschnittsunterschied aufweist, so daß er, wenn der besagte Raum im Druckzustand ist, durch eine Abwärtskraft beaufschlagt wird,
    . ein im oberen Teil des Ventilkörpers befindliches Verankerungssystem (14), das so beschaffen ist, daß es den besagten Ventilkörper in einer in dem Förderrohr sitzenden Hülsenfassung (1) befestigt,
    . Dichtungsringe, und zwar einen unteren Dichtungsring (16) und einen oberen (15), die so in dem Ventilkörper angeordnet sind, daß Abdichtung an der Grenzfläche zwischen dem besagten Ventilkörper und der Fassungshülse unterhalb und oberhalb des Steuerflüssigkeitseingangs gewährleistet ist,
    wobei das besagte Sicherheitsventil dadurch gekennzeichnet ist, daß die Dichtungsringe (15, 16) zur einen und zur anderen Seite des Steuerflüssigkeitseingangs (3a, 4a) unmittelbar unterhalb und oberhalb des besagten Flüssigkeitseingangs angeordnet sind, wobei sich das Verankerungssystem (14) oberhalb des oberen Dichtungsrings (15) befindet, während die Rückholfeder (10) unterhalb des unteren Dichtungsringes (16) in einer ringförmigen Aussparung angeordnet ist, die durch einen Teil des abgedichteten Raumes zur Aufnahme der Steuerflüssigkeit gebildet wird.
  2. Sicherheitsventil nach Anspruch 1, dadurch gekennzeichnet, daß der abgedichtete Raum zur Aufnahme der Steuerflüssigkeit an der Grenzfläche zwischen dem Schieber und dem Ventilkörper begrenzt ist, und zwar :
    . einerseits durch einen oberen Dichtungsring (21), der in einer Nut oberhalb des Steuerflüssigkeitseingangs, an einem oberen Abschnitt des Schiebers mit vorbestimmtem Durchmesser anliegend angeordnet ist,
    . und andererseits durch einen unteren Dichtungsring (22), der in einer unterhalb und in der Nähe des unteren Rückholfederendes befindlichen Nut an einem unteren Abschnitt des Schiebers angeordnet ist, wobei der Durchmesser des besagten Abschnitts größer ist als der des besagten oberen Abschnitts.
  3. Sicherheitsventil nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die in der den Schieber (9) umgebenden ringförmigen Aussparung angeordnete Rückholfeder (10) sich zwischen einerseits einer oberen, mit dem Schieber fest verbundenen Abstützung (19) und andererseits einer verschiebbar rings um den besagten Schieber angeordneten unteren Hülse (20) erstreckt, wobei ein unterer Anschlag (9c) den Abwärtshub der besagten Hülse im Verhältnis zu dem besagten Schieber begrenzt und die besagte Hülse sich im unteren Teil an eine im Inneren des Ventilkörpers vorgesehene Schulter (7a) anlegt.
  4. Sicherheitsventil nach den Ansprüchen 2 und 3 gemeinsam, dadurch gekennzeichnet, daß der untere Dichtungsring (22) unterhalb und in der Nähe der unteren Hülse (20) angeordnet ist.
  5. Sicherheitsventil nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß der den Hub der Hülse (20) im Verhältnis zu dem Schieber (9) begrenzende untere Anschlag durch eine an der Außenfläche des besagten Schiebers zwischen zwei Abschnitten unterschiedlichen Durchmessers des besagten Schiebers vorgesehene Schulter (9c) gebildet wird, wobei die besagte Schulter einen Querschnittsunterschied abgrenzt, auf den die Steuerflüssigkeit einwirkt, wobei die Hülse (20) eine Bohrung mit zwei Querschnitten aufweist, die eine Fläche (20a) zum Anschlag an der besagten Schulter umfaßt.
  6. Sicherheitsventll nach einem der Ansprüche 3, 4 oder 5, dadurch gekennzeichnet, daß die mit Schieber (9) fest verbundene obere Abstützung eine um den besagten Schieber geschraubte Ringmutter (19) umfaßt, und zwar ist der besagte Schieber zu diesem Zweck in einem Bereich seiner äußeren Oberfläche mit einem Gewinde versehen.
  7. Sicherheitsventil nach Anspruch 6, dadurch gekennzeichnet, daß die Ringmutter (19) bei Abschluß der Schrauboperation an einer Schulter (9b) anschließt, wobei die besagte Schulter an der äußeren Oberfläche des Schiebers zwischen zwei Abschnitten unterschiedlichen Durchmessers des besagten Schiebers vorgesehen ist, wodurch ein Querschnittsunterschied abgegrenzt wird, auf den die Steuerflüssigkeit einwirkt.
  8. Sicherheitsventil nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet,
    . daß rings um den Schieber (9) zwischen der Ringmutter (19) und dem entsprechenden Ende der Feder (10) ein Hilfsmontagering (18) angeordnet ist, wobei der besagte Hilfsring so angeordnet ist, daß er entlang des Schiebers gleiten kann und an seinem Umfang eine Aussparung (18a) aufweist, die es ermöglicht, ihn mit Hilfe eines Montagewerkzeugs bewegungsunfähig zu machen,
    . daß die untere Hülse (20) an ihrem Umfang eine Ausparung (20b) aufweist, die es ermöglicht, sie mit Hilfe des Montagewerkzeugs bewegungsunfähig zu machen.
  9. Sicherheitsventil nach einem der Ansprüche 3, 4, 5, 6, 7 oder 8, dadurch gekennzeichnet, daß der Ventilkörper sich aus mehreren rohrförmigen, miteinander verbundenen Teilen zusammensetzt, umfassend :
    . eine obere Dichtungsstütze (3), die an der Außenseite mit einer Aussparung zum Einsetzen des oberen Dichtungsringes (15) und auf einer niedrigeren Ebene mit einer Steuerflüssigkeitseingangsöffnung (3a) versehen ist,
    . ein Federgehäuse (6), das sich rings um die Feder (10) erstreckt und mit Hilfe eines oberen Wulstes (6a) an der oberen Dichtungsstütze (3) angeschraubt ist, wobei der besagte obere Wulst an der Außenseite mit einer Aussparung zum Einfügen des unteren Dichtungsringes (16) versehen ist,
    . einen rohrförmigen Abstandring (4), der sich zwischen dem unteren und dem oberen Dichtungsring (15, 16) rings um die obere Dichtungsstütze (3) erstreckt, wobei der besagte Abstandring (4) mit einer Öffnung (4a) versehen ist, die mit Steuerflüssigkeitseingangsöffnung (3a) in Verbindung steht,
    . eine untere Hülse (7), die mit dem unteren Ende des Federgehäuses (6) verschraubt ist und innerhalb dieses Gehäuses die besagte Schulter (7a) zum Anlegen der unteren Hülse (20) bildet, wobei die besagte Hülse (7) an ihrem unteren Teil den Verschlußkörper (11) umfaßt.
  10. Sicherheitsventil nach Anspruch 9, dadurch gekennzeichnet, daß der rohrförmige Abstandring (4) an seinem unteren Teil durch eine rings um die obere Dichtungsstütze (3) geschraubte Ringmutter (5) geschlossen ist, wobei die besagte Ringmutter (5) den unteren Dichtungsring (16) blockiert und einen Anschlag für den Wulst (6a) des Federgehäuses bildet.
  11. Einrichtwerkzeug zur Einrichtung eines Ventils nach Anspruch 8, dadurch gekennzeichnet, daß es einen sich entlang einer Achse erstreckenden Rahmen (25), rückziehbare, an dem besagten Rahmen in verschiedenen Höhen angeordnete Schraubelemente (26, 27), die so beschaffen sind, daß sie die Hülse (20) bzw. den Hilfsring (18) des Ventils in Position halten können, sowie eine Klemmstange (28) umfaßt, die mit Elementen (29, 32) zur Abstützung an der besagten Hülse und dem besagten Hilfsring bestückt ist, um die Ventilfeder (10) zusammenzupressen.
EP87202599A 1986-07-29 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils Expired - Lifetime EP0321609B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8611417A FR2602819B1 (fr) 1986-07-29 1986-07-29 Vanne de securite commandee par un fluide de surface pour puits petrolier et outil de montage de ladite vanne
DE8787202599T DE3778707D1 (de) 1987-12-22 1987-12-22 Erdoelbohrungssicherheitsventil und werkzeug zum einbau eines derartigen ventils.
EP87202599A EP0321609B1 (de) 1987-12-22 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87202599A EP0321609B1 (de) 1987-12-22 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils

Publications (2)

Publication Number Publication Date
EP0321609A1 EP0321609A1 (de) 1989-06-28
EP0321609B1 true EP0321609B1 (de) 1992-04-29

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EP87202599A Expired - Lifetime EP0321609B1 (de) 1986-07-29 1987-12-22 Erdölbohrungssicherheitsventil und Werkzeug zum Einbau eines derartigen Ventils

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DE (1) DE3778707D1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252197A (en) * 1979-04-05 1981-02-24 Camco, Incorporated Piston actuated well safety valve
FR2555246B2 (fr) * 1982-11-29 1986-09-05 Petroles Cie Francaise Vanne de securite pour puits petrolier
FR2536783B1 (fr) * 1982-11-29 1986-07-04 Petroles Cie Francaise Vanne de securite pour puits petrolier
US4691776A (en) * 1986-05-29 1987-09-08 Camco, Incorporated Retrievable well safety valve with expandable external seals

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EP0321609A1 (de) 1989-06-28
DE3778707D1 (de) 1992-06-04

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