US3799258A - Subsurface well safety valve - Google Patents

Subsurface well safety valve Download PDF

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US3799258A
US3799258A US00200401A US20040171A US3799258A US 3799258 A US3799258 A US 3799258A US 00200401 A US00200401 A US 00200401A US 20040171 A US20040171 A US 20040171A US 3799258 A US3799258 A US 3799258A
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valve
bore
safety valve
fluid
safety
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US00200401A
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G Tausch
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CAMCO INC US
Camco International Inc
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Camco Inc
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Priority to GB2464172A priority patent/GB1341666A/en
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Assigned to CAMCO INTERNATIONAL INC., A CORP. OF DE reassignment CAMCO INTERNATIONAL INC., A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: CAMCO, INCORPORATED, A CORP. OF TX.
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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
    • E21B34/106—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 the retrievable element being a secondary control fluid actuated valve landed into the bore of a first inoperative control fluid actuated valve
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/05—Flapper valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface

Definitions

  • ABSTRACT A subsurface well safety valve for connection directly into a well tubing for shutting off flow of well fluids through the tubing when adverse well conditions occur, but yet providing a valve bore of substantially the same size as the bore of the well tubing for allowing unrestricted passage of well equipment.
  • the valve bore of the safety valve including means for supporting a second safety valve in the event that the first safety valve becomes inoperative.
  • a fluid control line extending from the surface to the first safety valve which valve includes a port communicating with the control line and opening into the valve bore with shearable means initially closing the port but when sheared communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
  • the present invention is directed to an improved subsurface well safety valve which may be installed directly in line with the well tubing and provide a valve bore of substantially the same size as the bore of the well tubing and which need not be removed for allowing the passage of other well tools therethrough, and yet which will support a second retrievable safety valve in the event the first valve becomes inoperative.
  • the present invention is directed to an improved subsurface well safety valve having connecting means at each end for connecting the valve into and forming a portion of the well tubing in which the bore of the valve has a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open.
  • Yet a further object of the present invention is the provision of a non-retrievable safety valve for forming a portion of the well tubing and includes means for supporting a second safety valve in the bore of the first safety valve in the event that the first valve ever becomes inoperative.
  • Still a further object of the present invention is the provision of a fluid controlled subsurface nonretrievable well safety valve which is controlled from the well surface and includes a port in communication with the control fluid which port extends into the valve bore and may be opened whereby a second valve positioned in the bore of the first safety valve may be controlled by surface fluid control in the event the first safety valve fails.
  • Yet a further object of the present invention is the provision of a subsurface well safety valve which may be threadably connected in a well tubing and has a full open valve bore adapted to receive a second safety valve in a position to contact and hold the first safety valve in an open position whereby the second safety valve will control the flow of well fluid through the well tubing.
  • FIGS. 1A, 1B and 1C are continuations of each other of a fragmentary elevational view, partly in cross section, illustrating the present invention which is shown with the valve in the open position.
  • FIGS. 2A and 2B are continuations of each other of a fragmentary elevational view, partly in cross section, illustrating a retrievable fluid actuated safety valve in position in the non-retrievable safety valve of FIGS. IA, 18 and 1C.
  • the subsurface safety valve of the present invention is generally indicated by the reference numeral 10 and is of a non-retrievable type as connecting means are provided on each end of the valve 10 such as a threaded pin 12 at one end and a threaded box (not shown) at the other end for connecting the safety valve 10 directly into the tubing (not shown) of an oil and/or gas well.
  • the safety valve 10 generally includes a body 12 adapted to be connected in a well tubing to form a part thereof and to permit production therethrough under normal operating conditions but in which the safety valve may close or be closed in response to abnormal conditions such as might occur when the well over-produces, blows wild, or in the event of a failure of well equipment.
  • the safety valve body 12 generally includes a bore 14, an annular valve seat 16 positioned about the bore 14, a flapper valve element 18 connected to the body by a pivot pin 20.
  • a sliding tube 22 is telescopically movable in the body 12 and through the valve seat 16.
  • the bore 14 is a full bore, that is, the bore 14 is of a size substantially as great as the bore of the well tubing and thus allows the passageway of well tools therethrough without requiring removal of the safety valve 10 from the well tubing as would be the case of a retrievable safety valve positioned inside the well tubing.
  • Various forces may be provided to act on the sliding tube 22 to control its movement so that under normal conditions the sliding tube 22 will be in the downward position holding the flapper 18 away from and off of the valve seat 16 so that the valve 10 will be opened.
  • the sliding tube 20 When abnormal conditions occur, the sliding tube 20 will be moved upwardly allowing the flapper 18 to close shutting off flow through the valve 10 and well tubing.
  • yieldable means such as pressurized fluid in a chamber 25 and/or a spring 26 may act between a shoulder 28 on the valve body 12 and a shoulder 30 connected to the sliding tube 22 for yieldably urging the tube 22 in an upward direction to release the flapper 18 for closing the valve 10.
  • the safety valve 10 is controlled by the application or removal of a pressurized fluid through a control path or line such as conduit 32 (FIG. 1A) extending to the well surface which supplies a pressurized fluid to chamber 34 and to the top of a piston 36 (FIG. 1B) which is connected to the sliding tube 22.
  • a control path or line such as conduit 32 (FIG. 1A) extending to the well surface which supplies a pressurized fluid to chamber 34 and to the top of a piston 36 (FIG. 1B) which is connected to the sliding tube 22.
  • the safety valve while providing a dependable valve, is non-retrievable and therefore is not subject to being periodically maintained unless the well tubing is pulled.
  • the valve 10 may be periodically tested.
  • means are provided in the bore 14 of the valve 10 for supporting a second safety valve which may take over the function of protecting the well while at the same time deactivating the safety valve 10. While any suitable means may be provided in the bore 14, one such means may be a recess 40 for supporting a well lock and second safety valve therein as will be more fully described hereinafter.
  • valve 10 includes means whereby the flow control fluid in the conduit 32 may be used to control a second safety valve positioned in the valve bore 14.
  • a port 42 is provided, in communication with the chamber 34 and thus the fluid in the control line 32, and extends into the bore 14 of the valve 10.
  • the port 14 is initially closed by a shear screw 44 for preventing the control fluid from entering the well bore 14 while the safety valve 10 is operative.
  • a shearing sleeve 46 is provided in the bore 14. When the valve 10 becomes inoperative, and it is desired to place a second safety valve in the bore 14 which is to be controlled by the fluid in the control line 32, the shearing sleeve 46 is actuated by a suitable well tool and moved downwardly to shear the shear screw 44 allowing the control fluid to pass through the now opened port 42 and into the bore 14 to control a second fluid control safety valve.
  • FIGS. 2A and 2B the installation of a second safety valve 50 into the safety valve 10 is best seen.
  • the shear screw 44 has been sheared allowing the flow of control fluid from control line 32 to pass through the port 42 and into the bore 14 of the safety valve 10.
  • the valve 50 is a retrievable safety valve which is fluid controlled such as a Camco type B safety valve.
  • the safety valve 50 is held in position in the well bore 14 by means of a suitable well lock 52 such as a Camco M lock in which the locking dogs 54 are expanded in engagement with the recess 40 for supporting the well lock 52 and the second safety valve Suitable seal means are provided for directing the fluid flow from the port 42 to the actuation mechanism of the second valve 10.
  • a seal 56 here shown positioned on the well lock 52 and a seal 58 on the valve 50 engage sealing surfaces 60 and 62 on the interior of the bore 14 of the valve 10 for insuring that the control fluid flowing through the port 42 will flow into a port 64 in the valve 50 for control thereof.
  • the shearing sleeve 46 may include the sealing surface 60 and further include seals 66 for preventing leakage of control fluid into the bore 14.
  • valve 50 is provided with an extension 68 which extends through the valve seat 16 of the valve 10 holding the flapper 18 in a deactuated position so that only the second safety valve 50 will control the flow of fluid through the well tubing.
  • the second safety valve 50 may include a flapper 70, a valve seat 72, a sliding tube 74 which is yieldably urged upwardly by a spring 76.
  • the control fluid flowing through the port 64 acts against a piston 78 to move the sliding tube 74 downwardly for controlling the position of the flapper 70.
  • the second fluid actuated safety valve 50 may be inserted into the bore 14 of the non-retrievable safety valve 10 and assume the function of protecting the well, deactuating the first safety valve 10, and being controlled by control fluid in the control line 32.
  • the second valve 50 of FIGS. 2A and 23 may be conventionally removed from the well bore 14 if desired to allow other well tools passage therethrough for performing well operations therebelow.
  • the secondary valve 50 may be conveniently removed periodically for maintenance.
  • a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing and yieldable means biasing said valve in a direction to close, and a fluid control line extending to the surface for supplying a fluid acting on the valve in a direction to open said valve, the improvement comprising,
  • the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open,
  • valve bore including means for supporting a second safety valve in said first valve bore
  • said first valve having a port in communication with the control fluid for the first valve and opening into the first valve bore
  • the apparatus of claim 1 including a second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
  • a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing with yieldable means biasing the valve in a direction to close, and a fluid control line extending to the surface for supplying a pressurized fluid acting on a piston in a direction to open the valve, the improvement comprising,
  • the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting flow therethrough when the valve is open,
  • valve bore including a recess for supporting a second safety valve in the first valve bore
  • said first valve bore including a sealing surface for coacting with an external seal means on the second valve
  • a port in the first valve in communication with the control fluid in the valve and opening into the first bore
  • shearable means initially closing said port
  • a shearing sleeve in the first valve bore which when actuated shears the shearable means for supplying control fluid into the first valve bore for controlling a second safety valve positioned in the first valve bore.
  • a second safety valve supported in the first valve bore and including a piston which when actuated opens said second valve
  • said second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.

Abstract

A subsurface well safety valve for connection directly into a well tubing for shutting off flow of well fluids through the tubing when adverse well conditions occur, but yet providing a valve bore of substantially the same size as the bore of the well tubing for allowing unrestricted passage of well equipment. The valve bore of the safety valve including means for supporting a second safety valve in the event that the first safety valve becomes inoperative. A fluid control line extending from the surface to the first safety valve which valve includes a port communicating with the control line and opening into the valve bore with shearable means initially closing the port but when sheared communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.

Description

United States Patent [191 Tausch [4 1 Mar. 26, 1974 SUBSURFACE WELL SAFETY VALVE Gilbert H. Tausch, Houston, Tex.
[73] Assignee: Camco Incorporated, Houston, Tex.
[22] Filed: Nov. 19, 1971 [21] Appl. No.: 200,401
[75] Inventor:
58 FieldofSearch 66/72, 224,315; 137/458, L Zl ..Z12
[56] References Cited UNITED STATES PATENTS 3,744,564 7/1973 Mott 166/224 S 3,762,471 10/1973 Mott..... l66/224S 3,763,933 10/1973 Mott 166/224 S 3,509,913 5/1970 Lewis 137/6l4.l1 3,292,706 12/1966 Grimmer et al. 166/224 3,332,497 7/1967 Page,.1r. 166/224 3,675,720 7/1972 Sizer 166/314 E 14 -as i 42 4J-- 44 Primary Examiner-James A. Leppink Attorney, Agent, or Firm.lefferson D. Giller; James F. Weiler; William A. Stout [5 7] ABSTRACT A subsurface well safety valve for connection directly into a well tubing for shutting off flow of well fluids through the tubing when adverse well conditions occur, but yet providing a valve bore of substantially the same size as the bore of the well tubing for allowing unrestricted passage of well equipment. The valve bore of the safety valve including means for supporting a second safety valve in the event that the first safety valve becomes inoperative. A fluid control line extending from the surface to the first safety valve which valve includes a port communicating with the control line and opening into the valve bore with shearable means initially closing the port but when sheared communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
5 Claims, 5 Drawing Figures PATENTEU MAR 2 6 I974 SHEET 1 [IF 2 SUBSURFACE WELL SAFETY VALVE BACKGROUND OF THE INVENTION Generally, it is old to use a retrievable type safety valve that is removably inserted in the well tubing of an oil and/or gas well for protecting the well. However, such retrievable safety valves create a restriction in the well bore and generally have to be removed prior to moving other well tools through the well tubing for performing various well operations below the point of the safety valve installation.
The present invention is directed to an improved subsurface well safety valve which may be installed directly in line with the well tubing and provide a valve bore of substantially the same size as the bore of the well tubing and which need not be removed for allowing the passage of other well tools therethrough, and yet which will support a second retrievable safety valve in the event the first valve becomes inoperative.
SUMMARY The present invention is directed to an improved subsurface well safety valve having connecting means at each end for connecting the valve into and forming a portion of the well tubing in which the bore of the valve has a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open.
Yet a further object of the present invention is the provision of a non-retrievable safety valve for forming a portion of the well tubing and includes means for supporting a second safety valve in the bore of the first safety valve in the event that the first valve ever becomes inoperative.
Still a further object of the present invention is the provision of a fluid controlled subsurface nonretrievable well safety valve which is controlled from the well surface and includes a port in communication with the control fluid which port extends into the valve bore and may be opened whereby a second valve positioned in the bore of the first safety valve may be controlled by surface fluid control in the event the first safety valve fails.
Yet a further object of the present invention is the provision of a subsurface well safety valve which may be threadably connected in a well tubing and has a full open valve bore adapted to receive a second safety valve in a position to contact and hold the first safety valve in an open position whereby the second safety valve will control the flow of well fluid through the well tubing.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A, 1B and 1C are continuations of each other of a fragmentary elevational view, partly in cross section, illustrating the present invention which is shown with the valve in the open position.
FIGS. 2A and 2B are continuations of each other of a fragmentary elevational view, partly in cross section, illustrating a retrievable fluid actuated safety valve in position in the non-retrievable safety valve of FIGS. IA, 18 and 1C.
DESCRIPTION OF PREFERRED EMBODIMENTS While the present improvement in a subsurface well safety valve will be shown, for purposes of illustration only, as incorporated in a flapper type well safety valve,
it will be understood that the present invention may be used with other types of safety valves having various types of seating elements.
Referring now to the drawings, in particular to FIGS. 1A and 1B, the subsurface safety valve of the present invention is generally indicated by the reference numeral 10 and is of a non-retrievable type as connecting means are provided on each end of the valve 10 such as a threaded pin 12 at one end and a threaded box (not shown) at the other end for connecting the safety valve 10 directly into the tubing (not shown) of an oil and/or gas well. The safety valve 10 generally includes a body 12 adapted to be connected in a well tubing to form a part thereof and to permit production therethrough under normal operating conditions but in which the safety valve may close or be closed in response to abnormal conditions such as might occur when the well over-produces, blows wild, or in the event of a failure of well equipment.
The safety valve body 12 generally includes a bore 14, an annular valve seat 16 positioned about the bore 14, a flapper valve element 18 connected to the body by a pivot pin 20. Thus, when the flapper 18 is in the upper position and seated on the valve seat 16, the safety valve 10 is closed blocking flow upwardly through the bore 14 and the well tubing. A sliding tube 22 is telescopically movable in the body 12 and through the valve seat 16.
As best seen in FIG. 1C, when the sliding tube 22 is moved to a downward position, the tube 22 pushes the flapper 18 away from the valve seat 16. Thus, the valve 10 is held in the open position so long as the sliding tube 22 is in the downward position. When the sliding tube 22 is moved upwardly, the flapper 18 is allowed to move upwardly onto the seat 16 by the action of a spring 24 and also by the action of fluid flow moving upwardly through the bore 14 of the body 12.
It is to be noted while the safety valve 10 is nonretrievable since it is threaded into and forms a portion of the well tubing. The bore 14 is a full bore, that is, the bore 14 is of a size substantially as great as the bore of the well tubing and thus allows the passageway of well tools therethrough without requiring removal of the safety valve 10 from the well tubing as would be the case of a retrievable safety valve positioned inside the well tubing.
Various forces may be provided to act on the sliding tube 22 to control its movement so that under normal conditions the sliding tube 22 will be in the downward position holding the flapper 18 away from and off of the valve seat 16 so that the valve 10 will be opened. When abnormal conditions occur, the sliding tube 20 will be moved upwardly allowing the flapper 18 to close shutting off flow through the valve 10 and well tubing. Thus, yieldable means such as pressurized fluid in a chamber 25 and/or a spring 26 may act between a shoulder 28 on the valve body 12 and a shoulder 30 connected to the sliding tube 22 for yieldably urging the tube 22 in an upward direction to release the flapper 18 for closing the valve 10.
The safety valve 10 is controlled by the application or removal ofa pressurized fluid through a control path or line such as conduit 32 (FIG. 1A) extending to the well surface which supplies a pressurized fluid to chamber 34 and to the top of a piston 36 (FIG. 1B) which is connected to the sliding tube 22. When pressure is applied through the conduit 32, the piston 36 and tubing 22 will be moved downward forcing the flapper 18 off of the seat 16 and into the full open position. If the fluid pressure in the conduit 32 is reduced sufficiently relative to the forces urging the tube 22 upwardly, the tube 22 will be moved upwardly beyond the seat 16 allowing the flapper 18 to swing and close the seat 16.
However, the safety valve while providing a dependable valve, is non-retrievable and therefore is not subject to being periodically maintained unless the well tubing is pulled. Of course, the valve 10 may be periodically tested. In the event that the valve 10 becomes inoperative for any reason, means are provided in the bore 14 of the valve 10 for supporting a second safety valve which may take over the function of protecting the well while at the same time deactivating the safety valve 10. While any suitable means may be provided in the bore 14, one such means may be a recess 40 for supporting a well lock and second safety valve therein as will be more fully described hereinafter.
In addition, assuming that the safety valve 20 has become inoperative, which condition is not due to a malfunction of the flow control conduit 32, the valve 10 includes means whereby the flow control fluid in the conduit 32 may be used to control a second safety valve positioned in the valve bore 14.
Referring now to FIG. 1A, a port 42 is provided, in communication with the chamber 34 and thus the fluid in the control line 32, and extends into the bore 14 of the valve 10. The port 14 is initially closed by a shear screw 44 for preventing the control fluid from entering the well bore 14 while the safety valve 10 is operative. A shearing sleeve 46 is provided in the bore 14. When the valve 10 becomes inoperative, and it is desired to place a second safety valve in the bore 14 which is to be controlled by the fluid in the control line 32, the shearing sleeve 46 is actuated by a suitable well tool and moved downwardly to shear the shear screw 44 allowing the control fluid to pass through the now opened port 42 and into the bore 14 to control a second fluid control safety valve.
Referring now to FIGS. 2A and 2B, the installation of a second safety valve 50 into the safety valve 10 is best seen. In FIG. 2A, the shear screw 44 has been sheared allowing the flow of control fluid from control line 32 to pass through the port 42 and into the bore 14 of the safety valve 10. The valve 50 is a retrievable safety valve which is fluid controlled such as a Camco type B safety valve. The safety valve 50 is held in position in the well bore 14 by means ofa suitable well lock 52 such as a Camco M lock in which the locking dogs 54 are expanded in engagement with the recess 40 for supporting the well lock 52 and the second safety valve Suitable seal means are provided for directing the fluid flow from the port 42 to the actuation mechanism of the second valve 10. Thus, a seal 56, here shown positioned on the well lock 52 and a seal 58 on the valve 50 engage sealing surfaces 60 and 62 on the interior of the bore 14 of the valve 10 for insuring that the control fluid flowing through the port 42 will flow into a port 64 in the valve 50 for control thereof. As shown, the shearing sleeve 46 may include the sealing surface 60 and further include seals 66 for preventing leakage of control fluid into the bore 14.
Still referring to FIGS. 2A and 2B and assuming that the valve 10 has become inoperative, with the tubing 22 in an upward position, the flapper 18 of the valve 10 would close and shut off the flow of fluid to the valve and well tubing. Therefore, valve 50 is provided with an extension 68 which extends through the valve seat 16 of the valve 10 holding the flapper 18 in a deactuated position so that only the second safety valve 50 will control the flow of fluid through the well tubing.
As is conventional, the second safety valve 50 may include a flapper 70, a valve seat 72, a sliding tube 74 which is yieldably urged upwardly by a spring 76. The control fluid flowing through the port 64 acts against a piston 78 to move the sliding tube 74 downwardly for controlling the position of the flapper 70. Thus, as shown in FIGS. 2A and 2B the second fluid actuated safety valve 50 may be inserted into the bore 14 of the non-retrievable safety valve 10 and assume the function of protecting the well, deactuating the first safety valve 10, and being controlled by control fluid in the control line 32.
Of course, the second valve 50 of FIGS. 2A and 23 may be conventionally removed from the well bore 14 if desired to allow other well tools passage therethrough for performing well operations therebelow. In addition, the secondary valve 50 may be conveniently removed periodically for maintenance.
The present invention, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned as well as others inherent therein. While presently preferred embodiments of the invention are given for the purpose of disclosure, numerous changes in the details of construction and arrangement of parts will readily suggest themselves to those skilled in the art and are encompassed with the spirit of the invention and the scope of the appended claims.
What is claimed is:
1. In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing and yieldable means biasing said valve in a direction to close, and a fluid control line extending to the surface for supplying a fluid acting on the valve in a direction to open said valve, the improvement comprising,
connecting means on each end of the safety valve for connecting the valve in a well tubing,
the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open,
said valve bore including means for supporting a second safety valve in said first valve bore,
said first valve having a port in communication with the control fluid for the first valve and opening into the first valve bore, and
means initially closing said port but openable for communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
2. The apparatus of claim 1 including a second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
3. In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing with yieldable means biasing the valve in a direction to close, and a fluid control line extending to the surface for supplying a pressurized fluid acting on a piston in a direction to open the valve, the improvement comprising,
threaded connecting means on each end of the safety valve for connecting the valve in a well tubing,
the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting flow therethrough when the valve is open,
said valve bore including a recess for supporting a second safety valve in the first valve bore,
said first valve bore including a sealing surface for coacting with an external seal means on the second valve,
a port in the first valve in communication with the control fluid in the valve and opening into the first bore,
shearable means initially closing said port, and
a shearing sleeve in the first valve bore which when actuated shears the shearable means for supplying control fluid into the first valve bore for controlling a second safety valve positioned in the first valve bore.
4. The apparatus of claim 3 including,
a second safety valve supported in the first valve bore and including a piston which when actuated opens said second valve, and
seal means on said second safety valve sealing on the bore of the first safety valve for directing the control fluid from the port to the piston in the second valve.
5. The apparatus of claim 4 including,
said second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.

Claims (5)

1. In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing and yieldable means biasing said valve in a direction to close, and a fluid control line extending to the surface for supplying a fluid acting on the valve in a direction to open said valve, the improvement comprising, connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open, said valve bore including means for supporting a second safety valve in said first valve bore, said first valve having a port in communication with the control fluid for the first valve and opening into the first valve bore, and means initially closing said port but openable for communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
2. The apparatus of claim 1 including a second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
3. In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing with yieldable means biasing the valve in a direction to close, and a fluid control line extending to the surface for supplying a pressurized fluid acting on a piston in a direction to open the valve, the improvement comprising, threaded connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting flow therethrough when the valve is open, said valve bore including a recess for supporting a second safety valve in the first valve bore, said first valve bore including a sealing surface for coacting with an external seal means on the second valve, a port in the first valve in communication with the control fluid in the valve and opening into the first bore, shearable means initially closing said port, and a shearing sleeve in the first valve bore which when actuated shears the shearable means for supplying control fluid into the first valve bore for controlling a second safety valve positioned in the first valve bore.
4. The apparatus of claim 3 including, a second safety valve supported in the first valve bore and including a piston which when actuated oPens said second valve, and seal means on said second safety valve sealing on the bore of the first safety valve for directing the control fluid from the port to the piston in the second valve.
5. The apparatus of claim 4 including, said second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
US00200401A 1971-11-19 1971-11-19 Subsurface well safety valve Expired - Lifetime US3799258A (en)

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US00200401A US3799258A (en) 1971-11-19 1971-11-19 Subsurface well safety valve
GB2464172A GB1341666A (en) 1971-11-19 1972-05-25 Well safety valve

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US00200401A US3799258A (en) 1971-11-19 1971-11-19 Subsurface well safety valve

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Cited By (51)

* Cited by examiner, † Cited by third party
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US3882935A (en) * 1973-12-26 1975-05-13 Otis Eng Co Subsurface safety valve with auxiliary control fluid passage openable in response to an increase in control fluid pressure
US3967647A (en) * 1974-04-22 1976-07-06 Schlumberger Technology Corporation Subsea control valve apparatus
US4161219A (en) * 1978-02-27 1979-07-17 Camco, Incorporated Piston actuated well safety valve
US4173256A (en) * 1978-03-09 1979-11-06 Otis Engineering Corporation Subsurface safety valve
US4201363A (en) * 1978-07-17 1980-05-06 Otis Engineering Corporation Tubing retrievable surface controlled subsurface safety valve
US4249599A (en) * 1979-10-29 1981-02-10 Hydril Company Well safety system
FR2535784A1 (en) * 1982-11-10 1984-05-11 Camco Inc COMMUNICATION CONNECTION FOR A FLUID FOR CONTROLLING TOOLS USED IN WELLBORES
US4452311A (en) * 1982-09-24 1984-06-05 Otis Engineering Corporation Equalizing means for well tools
US4469179A (en) * 1981-12-17 1984-09-04 Otis Engineering Corporation Safety system
FR2557196A1 (en) * 1983-12-27 1985-06-28 Camco Inc HYDRAULIC CONTROL FLUID TRANSMISSION CONNECTION
US4552219A (en) * 1983-10-05 1985-11-12 Hydril Company Subsurface safety valve
US4566540A (en) * 1984-06-25 1986-01-28 Camco, Incorporated Hydraulically actuated control fluid communication nipple
US4569398A (en) * 1983-09-30 1986-02-11 Camco, Incorporated Subsurface well safety valve
US4597449A (en) * 1984-04-20 1986-07-01 Keeney L W Method and apparatus for preventing fluid runovers from a well
US4605070A (en) * 1985-04-01 1986-08-12 Camco, Incorporated Redundant safety valve system and method
EP0203008A1 (en) * 1985-05-21 1986-11-26 TOTAL Compagnie Française des Pétroles Hydraulically actuated safety valve for inclusion into an oil well tubing
US4703805A (en) * 1986-09-26 1987-11-03 Camco, Incorporated Equalizing means for a subsurface well safety valve
US4729433A (en) * 1986-07-29 1988-03-08 Diamant Boart France-Sa-Division Petrole Safety valve for oil-wells and installation tool for the valve
US4776399A (en) * 1986-07-29 1988-10-11 Diamant Boart France-SA-Petrole Division Oil-well safety-valve and tool for installing the same
US4838355A (en) * 1988-09-09 1989-06-13 Camco, Incorporated Dual hydraulic safety valve
US4860991A (en) * 1989-04-06 1989-08-29 Camco, Incorporated Safety valve
US4921003A (en) * 1984-04-06 1990-05-01 Den norske stats olkeselskap Shut-down valve
US4944351A (en) * 1989-10-26 1990-07-31 Baker Hughes Incorporated Downhole safety valve for subterranean well and method
US4981177A (en) * 1989-10-17 1991-01-01 Baker Hughes Incorporated Method and apparatus for establishing communication with a downhole portion of a control fluid pipe
US5127476A (en) * 1991-05-10 1992-07-07 Jerry L. Wilson Lockout housing and sleeve for safety valve
GB2264313A (en) * 1991-11-04 1993-08-25 John Victor Kernaghan Self closing safety valve for oil/gas drilling pipe-lines.
US5251702A (en) * 1991-07-16 1993-10-12 Ava International Corporation Surface controlled subsurface safety valve
US5314026A (en) * 1992-03-04 1994-05-24 Otis Engineering Corporation Landing nipple
US5358053A (en) * 1991-04-01 1994-10-25 Ava International Corporation Subsurface safety valve
WO1996012864A1 (en) * 1994-10-19 1996-05-02 Camco International Inc. Subsurface safety valve of minimized length
US5598864A (en) * 1994-10-19 1997-02-04 Camco International Inc. Subsurface safety valve
US5858921A (en) * 1996-04-03 1999-01-12 Albemarle Corporation Glyphosate herbicidal and plant growth regulant compositions and their use
US5862865A (en) * 1996-04-18 1999-01-26 Baker Hughes Incorporated Insert gas lift system
US6053251A (en) * 1997-05-15 2000-04-25 Halliburton Energy Services, Inc. Reduced travel operating mechanism for downhole tools
WO2003010412A2 (en) * 2001-07-24 2003-02-06 Baker Hughes Incorporated Sand control seal for subsurface safety valve
US6523614B2 (en) 2001-04-19 2003-02-25 Halliburton Energy Services, Inc. Subsurface safety valve lock out and communication tool and method for use of the same
US20040007365A1 (en) * 2002-07-12 2004-01-15 Weatherford/Lamb, Inc. Method and apparatus for locking out a subsurface safety valve
US20040045714A1 (en) * 2002-09-05 2004-03-11 Weatherford/Lamb Inc. Downhole milling machine and method of use
US20050098325A1 (en) * 2003-10-27 2005-05-12 Myerley Thomas S. Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
GB2410968A (en) * 2001-07-24 2005-08-17 Baker Hughes Inc Seal assembly for insert safety valve
US20080196891A1 (en) * 2007-02-13 2008-08-21 Bj Service Company Communication tool and method for a subsurface safety valve with communication component
AU2008200288B2 (en) * 2001-07-24 2010-09-02 Baker Hughes Incorporated Sand control seal for subsurface safety valve
US7918280B2 (en) 2007-02-13 2011-04-05 Baker Hughes Incorporated Radial indexing communication tool and method for subsurface safety valve with communication component
US20110209881A1 (en) * 2010-02-26 2011-09-01 Halliburton Energy Services, Inc. Pressure-Activated Valve for Hybrid Coiled Tubing Jointed Tubing Tool String
US8733449B2 (en) 2011-04-15 2014-05-27 Hilliburton Energy Services, Inc. Selectively activatable and deactivatable wellbore pressure isolation device
US9291035B2 (en) 2011-12-01 2016-03-22 Weatherford Switzerland Trading And Development Gmbh Wellbore cleaning apparatus and method
US9394761B2 (en) 2013-10-03 2016-07-19 Saudi Arabian Oil Company Flexible zone inflow control device
US9470063B2 (en) 2013-01-18 2016-10-18 Halliburton Energy Services, Inc. Well intervention pressure control valve
US20180355698A1 (en) * 2016-03-14 2018-12-13 Halliburton Energy Services, Inc. Mechanisms for transferring hydraulic regulation from a primary safety valve to a secondary safety valve
US20200056714A1 (en) * 2018-08-14 2020-02-20 Tejas Research & Engineering, Llc Deep set production tubing pressure insensitive wireline retrievable safety valve
WO2020123331A1 (en) * 2018-12-13 2020-06-18 Tejas Research & Engineering, Llc Surface-controlled wireline-retrievable safety valve

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FR2734863B1 (en) * 1995-05-30 1997-08-29 Pyreneenne De Metallurg Scop S PROCESS AND MEANS FOR THE SECURITY OF AN OIL WELL IN THE EVENT OF A DEFECT IN THE HYDRAULIC CONTROL LINE OF ITS DOWNHOLE SAFETY VALVE

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US3509913A (en) * 1967-07-25 1970-05-05 Hydril Co Rotary plug well safety valve
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US3509913A (en) * 1967-07-25 1970-05-05 Hydril Co Rotary plug well safety valve
US3675720A (en) * 1970-07-08 1972-07-11 Otis Eng Corp Well flow control system and method
US3744564A (en) * 1971-04-06 1973-07-10 Hydril Co Subsurface well apparatus and method
US3762471A (en) * 1971-04-06 1973-10-02 Hydril Co Subsurface well apparatus and method
US3763933A (en) * 1971-04-06 1973-10-09 Hydril Co Retrievable safety valve

Cited By (92)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882935A (en) * 1973-12-26 1975-05-13 Otis Eng Co Subsurface safety valve with auxiliary control fluid passage openable in response to an increase in control fluid pressure
US3967647A (en) * 1974-04-22 1976-07-06 Schlumberger Technology Corporation Subsea control valve apparatus
US4161219A (en) * 1978-02-27 1979-07-17 Camco, Incorporated Piston actuated well safety valve
US4173256A (en) * 1978-03-09 1979-11-06 Otis Engineering Corporation Subsurface safety valve
US4201363A (en) * 1978-07-17 1980-05-06 Otis Engineering Corporation Tubing retrievable surface controlled subsurface safety valve
US4249599A (en) * 1979-10-29 1981-02-10 Hydril Company Well safety system
US4469179A (en) * 1981-12-17 1984-09-04 Otis Engineering Corporation Safety system
US4452311A (en) * 1982-09-24 1984-06-05 Otis Engineering Corporation Equalizing means for well tools
FR2535784A1 (en) * 1982-11-10 1984-05-11 Camco Inc COMMUNICATION CONNECTION FOR A FLUID FOR CONTROLLING TOOLS USED IN WELLBORES
US4534414A (en) * 1982-11-10 1985-08-13 Camco, Incorporated Hydraulic control fluid communication nipple
US4569398A (en) * 1983-09-30 1986-02-11 Camco, Incorporated Subsurface well safety valve
US4552219A (en) * 1983-10-05 1985-11-12 Hydril Company Subsurface safety valve
FR2557196A1 (en) * 1983-12-27 1985-06-28 Camco Inc HYDRAULIC CONTROL FLUID TRANSMISSION CONNECTION
US4921003A (en) * 1984-04-06 1990-05-01 Den norske stats olkeselskap Shut-down valve
US4597449A (en) * 1984-04-20 1986-07-01 Keeney L W Method and apparatus for preventing fluid runovers from a well
US4566540A (en) * 1984-06-25 1986-01-28 Camco, Incorporated Hydraulically actuated control fluid communication nipple
US4605070A (en) * 1985-04-01 1986-08-12 Camco, Incorporated Redundant safety valve system and method
EP0203008A1 (en) * 1985-05-21 1986-11-26 TOTAL Compagnie Française des Pétroles Hydraulically actuated safety valve for inclusion into an oil well tubing
FR2582374A1 (en) * 1985-05-21 1986-11-28 Petroles Cie Francaise HYDRAULICALLY CONTROLLED SAFETY VALVE INCORPORABLE TO AN OIL WELL PRODUCTION TUBE
US4729433A (en) * 1986-07-29 1988-03-08 Diamant Boart France-Sa-Division Petrole Safety valve for oil-wells and installation tool for the valve
US4776399A (en) * 1986-07-29 1988-10-11 Diamant Boart France-SA-Petrole Division Oil-well safety-valve and tool for installing the same
US4703805A (en) * 1986-09-26 1987-11-03 Camco, Incorporated Equalizing means for a subsurface well safety valve
US4838355A (en) * 1988-09-09 1989-06-13 Camco, Incorporated Dual hydraulic safety valve
US4860991A (en) * 1989-04-06 1989-08-29 Camco, Incorporated Safety valve
FR2654462A1 (en) * 1989-10-17 1991-05-17 Baker Hughes Inc METHOD AND APPARATUS FOR ESTABLISHING COMMUNICATION WITH A BACKGROUND TRUNCON OF SURVEYING A CONTROL FLUID CONDUIT.
GB2237592A (en) * 1989-10-17 1991-05-08 Baker Hughes Inc Method and apparatus for establishing communication with a downhole portion of a control fluid pipe
GB2237592B (en) * 1989-10-17 1993-05-12 Baker Hughes Inc Method and apparatus for establishing communication with a downhole portion of a control fluid pipe
US4981177A (en) * 1989-10-17 1991-01-01 Baker Hughes Incorporated Method and apparatus for establishing communication with a downhole portion of a control fluid pipe
GB2237311A (en) * 1989-10-26 1991-05-01 Baker Hughes Inc Downhole safety valve for subterranean well and method
FR2653822A1 (en) * 1989-10-26 1991-05-03 Baker Hughes Inc METHOD FOR ESTABLISHING COMMUNICATION WITH CONTROLLED FLUID CONDUIT, APPARATUS FOR WELL BOTTOM SECTIONING, HOLLOW PROTUBERANCE, AND WELL BOTTOM SAFETY VALVE.
US4944351A (en) * 1989-10-26 1990-07-31 Baker Hughes Incorporated Downhole safety valve for subterranean well and method
GB2237311B (en) * 1989-10-26 1993-07-14 Baker Hughes Inc Downhole safety valve for subterranean well and method
US5358053A (en) * 1991-04-01 1994-10-25 Ava International Corporation Subsurface safety valve
US5127476A (en) * 1991-05-10 1992-07-07 Jerry L. Wilson Lockout housing and sleeve for safety valve
US5251702A (en) * 1991-07-16 1993-10-12 Ava International Corporation Surface controlled subsurface safety valve
GB2264313A (en) * 1991-11-04 1993-08-25 John Victor Kernaghan Self closing safety valve for oil/gas drilling pipe-lines.
US5314026A (en) * 1992-03-04 1994-05-24 Otis Engineering Corporation Landing nipple
WO1996012864A1 (en) * 1994-10-19 1996-05-02 Camco International Inc. Subsurface safety valve of minimized length
US5564675A (en) * 1994-10-19 1996-10-15 Camco International Inc. Subsurface safety valve of minimized length
US5598864A (en) * 1994-10-19 1997-02-04 Camco International Inc. Subsurface safety valve
US5858921A (en) * 1996-04-03 1999-01-12 Albemarle Corporation Glyphosate herbicidal and plant growth regulant compositions and their use
US5862865A (en) * 1996-04-18 1999-01-26 Baker Hughes Incorporated Insert gas lift system
US6053251A (en) * 1997-05-15 2000-04-25 Halliburton Energy Services, Inc. Reduced travel operating mechanism for downhole tools
US20070227738A1 (en) * 2001-04-19 2007-10-04 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US7249635B2 (en) 2001-04-19 2007-07-31 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US6953093B2 (en) 2001-04-19 2005-10-11 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US6659185B2 (en) 2001-04-19 2003-12-09 Halliburton Energy Services, Inc. Subsurface safety valve lock out and communication tool and method for use of the same
US20090114389A1 (en) * 2001-04-19 2009-05-07 Dennistoun Stuart M Communication Tool for Accessing a Non Annular Hydraulic Chamber of a Subsurface Safety Valve
US7475733B2 (en) 2001-04-19 2009-01-13 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US6523614B2 (en) 2001-04-19 2003-02-25 Halliburton Energy Services, Inc. Subsurface safety valve lock out and communication tool and method for use of the same
US7775269B2 (en) 2001-04-19 2010-08-17 Halliburton Energy Services, Inc. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US20040026087A1 (en) * 2001-04-19 2004-02-12 Dennistoun Stuart M. Subsurface safety valve and method for communicating hydraulic fluid therethrough
US6742595B2 (en) 2001-04-19 2004-06-01 Halliburton Energy Services, Inc. Subsurface safety valve lock out and communication tool and method for use of the same
US20050056414A1 (en) * 2001-04-19 2005-03-17 Dennistoun Stuart M. Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US20050056430A1 (en) * 2001-04-19 2005-03-17 Dennistoun Stuart M. Subsurface safety valve having a communication tool accessible non annular hydraulic chamber
US6880641B2 (en) 2001-04-19 2005-04-19 Halliburton Energy Services, Inc. Subsurface safety valve and method for communicating hydraulic fluid therethrough
US20060113081A1 (en) * 2001-04-19 2006-06-01 Halliburton Energy Services Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve
US7032672B2 (en) 2001-04-19 2006-04-25 Halliburton Energy Services, Inc. Subsurface safety valve having a communication tool accessible non annular hydraulic chamber
US6607037B2 (en) 2001-07-24 2003-08-19 Baker Hughes Incorporated Sand control seal for subsurface safety valve
WO2003010412A3 (en) * 2001-07-24 2004-02-12 Baker Hughes Inc Sand control seal for subsurface safety valve
GB2396874B (en) * 2001-07-24 2005-07-20 Baker Hughes Inc Sand control seal for subsurface safety valve
GB2410968B (en) * 2001-07-24 2006-02-15 Baker Hughes Inc Insert safety value for subsurface safety value
AU2008200288B2 (en) * 2001-07-24 2010-09-02 Baker Hughes Incorporated Sand control seal for subsurface safety valve
WO2003010412A2 (en) * 2001-07-24 2003-02-06 Baker Hughes Incorporated Sand control seal for subsurface safety valve
NO20040288L (en) * 2001-07-24 2004-01-23 Baker Hughes Inc Sand control seal for underground safety valve
GB2410968A (en) * 2001-07-24 2005-08-17 Baker Hughes Inc Seal assembly for insert safety valve
US6991040B2 (en) 2002-07-12 2006-01-31 Weatherford/Lamb, Inc. Method and apparatus for locking out a subsurface safety valve
US20040007365A1 (en) * 2002-07-12 2004-01-15 Weatherford/Lamb, Inc. Method and apparatus for locking out a subsurface safety valve
US20040045714A1 (en) * 2002-09-05 2004-03-11 Weatherford/Lamb Inc. Downhole milling machine and method of use
US7373983B2 (en) 2002-09-05 2008-05-20 Weatherford/Lamb, Inc. Downhole milling machine and method of use
US20070181305A1 (en) * 2002-09-05 2007-08-09 Mcgavern Cecil G Iii Downhole milling machine and method of use
US7188674B2 (en) 2002-09-05 2007-03-13 Weatherford/Lamb, Inc. Downhole milling machine and method of use
US20050098325A1 (en) * 2003-10-27 2005-05-12 Myerley Thomas S. Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
GB2424912B (en) * 2003-10-27 2007-12-19 Baker Hughes Inc Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
US7409996B2 (en) 2003-10-27 2008-08-12 Baker Hughes Incorporated Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
GB2424912A (en) * 2003-10-27 2006-10-11 Baker Hughes Inc Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
WO2005045184A1 (en) * 2003-10-27 2005-05-19 Baker Hughes Incorporated Control system communication and lock open tool and method for locking open a safety valve and communicating with surface
US7918280B2 (en) 2007-02-13 2011-04-05 Baker Hughes Incorporated Radial indexing communication tool and method for subsurface safety valve with communication component
US20080196891A1 (en) * 2007-02-13 2008-08-21 Bj Service Company Communication tool and method for a subsurface safety valve with communication component
US7694740B2 (en) 2007-02-13 2010-04-13 Bj Services Company Communication tool and method for a subsurface safety valve with communication component
US20110209881A1 (en) * 2010-02-26 2011-09-01 Halliburton Energy Services, Inc. Pressure-Activated Valve for Hybrid Coiled Tubing Jointed Tubing Tool String
US8276676B2 (en) * 2010-02-26 2012-10-02 Halliburton Energy Services Inc. Pressure-activated valve for hybrid coiled tubing jointed tubing tool string
US8733449B2 (en) 2011-04-15 2014-05-27 Hilliburton Energy Services, Inc. Selectively activatable and deactivatable wellbore pressure isolation device
US9291035B2 (en) 2011-12-01 2016-03-22 Weatherford Switzerland Trading And Development Gmbh Wellbore cleaning apparatus and method
US9470063B2 (en) 2013-01-18 2016-10-18 Halliburton Energy Services, Inc. Well intervention pressure control valve
US9394761B2 (en) 2013-10-03 2016-07-19 Saudi Arabian Oil Company Flexible zone inflow control device
US20180355698A1 (en) * 2016-03-14 2018-12-13 Halliburton Energy Services, Inc. Mechanisms for transferring hydraulic regulation from a primary safety valve to a secondary safety valve
US11136861B2 (en) * 2016-03-14 2021-10-05 Halliburton Energy Services, Inc. Mechanisms for transferring hydraulic regulation from a primary safety valve to a secondary safety valve
US20200056714A1 (en) * 2018-08-14 2020-02-20 Tejas Research & Engineering, Llc Deep set production tubing pressure insensitive wireline retrievable safety valve
WO2020123331A1 (en) * 2018-12-13 2020-06-18 Tejas Research & Engineering, Llc Surface-controlled wireline-retrievable safety valve
US20200190944A1 (en) * 2018-12-13 2020-06-18 Tejas Research & Engineering, Llc Surface controlled wireline retrievable safety valve
US10920529B2 (en) * 2018-12-13 2021-02-16 Tejas Research & Engineering, Llc Surface controlled wireline retrievable safety valve

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