EP0055183A1 - Pressure responsive valve seat apparatus - Google Patents
Pressure responsive valve seat apparatus Download PDFInfo
- Publication number
- EP0055183A1 EP0055183A1 EP81402038A EP81402038A EP0055183A1 EP 0055183 A1 EP0055183 A1 EP 0055183A1 EP 81402038 A EP81402038 A EP 81402038A EP 81402038 A EP81402038 A EP 81402038A EP 0055183 A1 EP0055183 A1 EP 0055183A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- seal
- diameter
- pressure
- housing
- 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.)
- Withdrawn
Links
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
- E21B2200/04—Ball valves
Definitions
- This invention relates generally to full-bore ball valves that are used, for,example, to control the flow of well fluids during a drill stem test, and particularly to a new and improved ball valve seat and seal assembly of the type described that is constructed and arranged such that when the valve is closed it will hold a predominant fluid pressure acting from either above or below the ball element.
- a drill stem test of an earth formation that has been intersected by a well bore may be considered as a temporary completion of the well.
- a packer and a test valve are run into the well on a pipe string and the packer is set to isolate the interval to be tested from the hydrostatic head of the well fluids thereabove.
- the test valve then is opened and closed to alternately flow and shut in the well; while a pressure recorder is used to record pressure data as a function of time. From the pressure record various highly useful parameters such as permeablity and initial reservoir pressure can be determined.
- test valve it is fairly typical for the test valve to include a ball-type closure element to control formation fluid flow.
- a ball valve has the advantage as opposed to other types of closure elements such as a sliding sleeve valve or the like, of providing when open an unobstructed vertical passage through the test tool to enable high flow rates of formation fluids as well as the capability for conducting other well services such as pressure surveys and perforating without withdrawing the equipment from the well.
- the valve must hold the greater pressure from below as the test tools are run into the well in order to maintain the pipe string initially as a low pressure region into which the well fluids can produce when the valve is opened.
- the valve also should have the capability for holding a greater pressure from above to enable pressure testing of the pipe string as it is being assembled at the surface and lowered into the well.
- a greater pressure from above also will be imposed when a fluid recovery in the pipe string is being reverse circulated therefrom during the final shut-in period. Of course, the leakage of such pressure will disturb or spoil the shut-in pressure measurements that are being recorded.
- a predominant pressure may be applied to the test valve from above when using a tubing pressure operated reverse circulating valve of the type disclosed and claimed in Upchurch application Serial No. 253,786, assigned to the assignee of the present invention.
- a ball valve closure has not been as effective as other types of closures in holding pressure from both directions because it is designed to close upwardly against a valve seat that surrounds the flow passage. Although pressure from below may tend to force the valve element against the seat and thus tighten the closure against leakage, it will be realized that pressure form above may have the opposite effect and tend to cause the ball element to leak.
- valve apparatus adapted for use in a well bore, comprising: tubular housing means defining a flow passage; valve means rotatable about an axis that is transverse to said flow passage between open and closed positions; seat means surrounding said flow passage and having a seat surface and seal means coacting with said valve means in said closed position to block fluid flow through said flow passage; and pressure responsive means for forcing said seat surface against said valve means in response to a predominate pressure either upstream or downstream of said valve means.
- an apparatus in which the present invention may be embodied includes inner and outer tubular housings 9 and 10 which together constitute a valve body 11 having a flow passage 12 extending longitudinally therethrough.
- a seat assembly indicated generally at 13 is mounted within the body 11 and surrounds the flow passage 12 for cooperation with a ball valve element 14.
- the ball element 14 has a bore 15 extending therethrough and is mounted for rotation about an axis that is transverse to the flow passage 12 between a closed position where the bore is disposed at right angles to the flow passage and an open position where the bore of the ball is aligned with the flow passage.
- the ball element 14 can be mounted for rotation on suitable means such as trunions 16 that extend for opposite side walls 17 of the ball into circular recesses 18 that are formed in the walls of the body 11.
- the ball element 14 can be rotated between its open and closed positions by any suitable means such as an actuator sleeve 20 which can rotate about the longitudinal axis of the body and which carries a ring 21 that is appropriately fixed to its upper end.
- the ring 21 has an inclined pin 22 that projects inwardly toward the center of the ball element 14.
- the pin 22 can have a roller 23 mounted thereon which engages within a rectangular slot 24 extending circumferentially of the ball in the outer periphery thereof.
- the ball element can be rotated to the open position in response to the rotation of the sleeve 20 in one direction and to the closed position by rotation of the sleeve in the opposite direction.
- this particular means for rotating the ball is only one of a number of different structures that might be used and is described herein for purposes of illustration and not in a limitive sense.
- the seat assembly 13 includes a retainer ring 25 that is provided with a spherical annular lower surface 26 which engages the outer periphery of the ball 14.
- a composite seal assembly 30 that engages the the outer peripheral wall of ball valve 14 may be located in a groove 31 that opens through the lower surface 26.
- the seal assembly 30 may be any suitable elastomer device for preventing fluid leakage when the valve is in the closed position, but preferably is constructed as disclosed and claimed in Meek application Serial No. 214,473, assigned to the assignee of the present invention.
- the retainer ring 25 is biased toward the ball element 14 by helical coil spring 32 that reacts between an upper end surface of the retainer ring 25 and a downwardly facing shoulder 34 on the housing 9.
- the retainer ring 25 has a reduced diameter upper portion 35 that provides an annular seal surface 36 whose diameter is denoted as A.
- the parts are sized and arranged such that the diameter A is smaller than the diameter of sealing engagement of the seal assembly 30 against the ball element 14, which is denoted as B.
- a piston ring 38 that is mounted between the upper portion 35 and the housing 11 is movable relatively along the housing between an upper position where the upper end of the ring 38 abuts a downwardly facing shoulder 39-on the housing, and a lower position where the lower end surface 40 thereof abuts against an upwardly facing shoulder 41 on the retainer ring 25.
- a seal 42 engages the upper portion of the retainer ring 25 on the diameter A, whereas another seal 43 engages the inner wall surface 44 of the housing 9 on having a seal diameter denoted as C.
- the seal diameter C is greater than the diameter B.
- the parts are assembled as shown in the drawings with the lower surface 26 of the retainer ring 13 and the composite seal assembly 30 engaging the outer surface of the ball element 14.
- the ball valve assembly as disclosed herein is to be used, for example, in a drill stem testing operation
- the ball initially is in the closed position as the tools are being run into the well to test depth.
- the region of the flow passage 12 located above the ball element 14 is at atmospheric or other low pressure with respect to the region below the ball element, which normally will contain well fluids at hydrostatic pressure.
- the relatively high fluid pressure upstream or below the ball valve 14 will act via the annular clearance space 45 between the retainer ring 25 and the housing wall 39 on the lower face of the piston ring 38 and on the upwardly facing shoulder 41 of the retainer ring.
- the pressure causes the piston 25 to shift upwardly into engagement with the housing shoulder 39 to thereby transfer upward force cue to such pressure to the housing 11.
- the pressure also acts downwardly on the shoulder 41 over a transverse cross-sectional area that is defined by the difference in diameters of sealing engagement A and B as downward force on the retainer ring 25 to hold the same tightly seated against the outer periphery of the ball valve element 14. The downward force is aided by the bias force of the spring 32.
- the pressure responsive valve seat assembly of the present invention is uniquely arranged to coact with the ball valve element 14 to prevent fluid leakage therepast, irregardless of whether the predominant fluid pressure is acting on the ball element from below or above.
Landscapes
- 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)
- Taps Or Cocks (AREA)
- Check Valves (AREA)
Abstract
In accordance with an illustrative embodiment of the present invention, a pressure responsive valve seat assembly that is cooperable with a ball valve element to hold pressure in either direction when the ball valve is closed includes a retainer ring that is spring biased toward the valve element and which carries a valve seat ring, and a floating piston that is sealingly slidable with respect to the retainer ring and the valve housing, the various diameters of sealing engagement between the piston and the housing and the retainer ring, and between the valve seat ring and the ball element being sized and arranged such that a predominate fluid pressure either upstream or downstream of the ball valve force the retainer ring against the ball valve to prevent fluid leakage.
Description
- This invention relates generally to full-bore ball valves that are used, for,example, to control the flow of well fluids during a drill stem test, and particularly to a new and improved ball valve seat and seal assembly of the type described that is constructed and arranged such that when the valve is closed it will hold a predominant fluid pressure acting from either above or below the ball element.
- A drill stem test of an earth formation that has been intersected by a well bore may be considered as a temporary completion of the well. A packer and a test valve are run into the well on a pipe string and the packer is set to isolate the interval to be tested from the hydrostatic head of the well fluids thereabove. The test valve then is opened and closed to alternately flow and shut in the well; while a pressure recorder is used to record pressure data as a function of time. From the pressure record various highly useful parameters such as permeablity and initial reservoir pressure can be determined.
- It is fairly typical for the test valve to include a ball-type closure element to control formation fluid flow. A ball valve has the advantage as opposed to other types of closure elements such as a sliding sleeve valve or the like, of providing when open an unobstructed vertical passage through the test tool to enable high flow rates of formation fluids as well as the capability for conducting other well services such as pressure surveys and perforating without withdrawing the equipment from the well.
- There is a need for the tester valve to hold without leaking predominant pressures that may be imposed thereon from both above and below. The valve must hold the greater pressure from below as the test tools are run into the well in order to maintain the pipe string initially as a low pressure region into which the well fluids can produce when the valve is opened. The valve also should have the capability for holding a greater pressure from above to enable pressure testing of the pipe string as it is being assembled at the surface and lowered into the well. A greater pressure from above also will be imposed when a fluid recovery in the pipe string is being reverse circulated therefrom during the final shut-in period. Of course, the leakage of such pressure will disturb or spoil the shut-in pressure measurements that are being recorded. Moreover, a predominant pressure may be applied to the test valve from above when using a tubing pressure operated reverse circulating valve of the type disclosed and claimed in Upchurch application Serial No. 253,786, assigned to the assignee of the present invention.
- However, a ball valve closure has not been as effective as other types of closures in holding pressure from both directions because it is designed to close upwardly against a valve seat that surrounds the flow passage. Although pressure from below may tend to force the valve element against the seat and thus tighten the closure against leakage, it will be realized that pressure form above may have the opposite effect and tend to cause the ball element to leak.
- Although various attempts have been made to provide a ball valve closure that will hold pressure from either direction, Applicant does not believe that such previous designs have been particularly adequate to accomplish the desired objective.
- It is a general object of the present invention to provide a new and improved ball valve closure apparatus useful in drill stem testing or the like.
- This and other objects are attained, in accordance with one aspect of the invention by valve apparatus adapted for use in a well bore, comprising: tubular housing means defining a flow passage; valve means rotatable about an axis that is transverse to said flow passage between open and closed positions; seat means surrounding said flow passage and having a seat surface and seal means coacting with said valve means in said closed position to block fluid flow through said flow passage; and pressure responsive means for forcing said seat surface against said valve means in response to a predominate pressure either upstream or downstream of said valve means.
- The present invention has other features and advantages which will become more clearly apparent in connection with the following detailed description of a preferred embodiment taken in conjunction with the appended drawing in which:
- FIGURE 1 is a view partly in c:oss-section and partly in elevation of a ball valve arrangement utilizing the unique pressure responsive seat assembly that is constructed in accordance with the present invention; and
- FIGURE 2 is an enlarged fragmentary cross-sectional view of the pressure responsive seat assembly of Figure 1.
- Referring intially to Figure 1, an apparatus in which the present invention may be embodied, includes inner and outer
tubular housings valve body 11 having aflow passage 12 extending longitudinally therethrough. A seat assembly indicated generally at 13 is mounted within thebody 11 and surrounds theflow passage 12 for cooperation with aball valve element 14. Theball element 14 has abore 15 extending therethrough and is mounted for rotation about an axis that is transverse to theflow passage 12 between a closed position where the bore is disposed at right angles to the flow passage and an open position where the bore of the ball is aligned with the flow passage. Theball element 14 can be mounted for rotation on suitable means such astrunions 16 that extend foropposite side walls 17 of the ball intocircular recesses 18 that are formed in the walls of thebody 11. - The
ball element 14 can be rotated between its open and closed positions by any suitable means such as anactuator sleeve 20 which can rotate about the longitudinal axis of the body and which carries aring 21 that is appropriately fixed to its upper end. Thering 21 has aninclined pin 22 that projects inwardly toward the center of theball element 14. Thepin 22 can have aroller 23 mounted thereon which engages within arectangular slot 24 extending circumferentially of the ball in the outer periphery thereof. Thus arranged it will be recognized that the ball element can be rotated to the open position in response to the rotation of thesleeve 20 in one direction and to the closed position by rotation of the sleeve in the opposite direction. Of course, this particular means for rotating the ball is only one of a number of different structures that might be used and is described herein for purposes of illustration and not in a limitive sense. - The
seat assembly 13 includes aretainer ring 25 that is provided with a spherical annularlower surface 26 which engages the outer periphery of theball 14. Acomposite seal assembly 30 that engages the the outer peripheral wall ofball valve 14 may be located in a groove 31 that opens through thelower surface 26. Theseal assembly 30 may be any suitable elastomer device for preventing fluid leakage when the valve is in the closed position, but preferably is constructed as disclosed and claimed in Meek application Serial No. 214,473, assigned to the assignee of the present invention. Theretainer ring 25 is biased toward theball element 14 byhelical coil spring 32 that reacts between an upper end surface of theretainer ring 25 and a downwardly facingshoulder 34 on thehousing 9. - As shown in enlarged detail in Figure 2, the
retainer ring 25 has a reduced diameterupper portion 35 that provides anannular seal surface 36 whose diameter is denoted as A. The parts are sized and arranged such that the diameter A is smaller than the diameter of sealing engagement of theseal assembly 30 against theball element 14, which is denoted as B.A piston ring 38 that is mounted between theupper portion 35 and thehousing 11 is movable relatively along the housing between an upper position where the upper end of thering 38 abuts a downwardly facing shoulder 39-on the housing, and a lower position where thelower end surface 40 thereof abuts against an upwardly facingshoulder 41 on theretainer ring 25. Aseal 42 engages the upper portion of theretainer ring 25 on the diameter A, whereas anotherseal 43 engages theinner wall surface 44 of thehousing 9 on having a seal diameter denoted as C. The seal diameter C is greater than the diameter B. - In operation the parts are assembled as shown in the drawings with the
lower surface 26 of theretainer ring 13 and thecomposite seal assembly 30 engaging the outer surface of theball element 14. In the case where the ball valve assembly as disclosed herein is to be used, for example, in a drill stem testing operation, the ball initially is in the closed position as the tools are being run into the well to test depth. The region of theflow passage 12 located above theball element 14 is at atmospheric or other low pressure with respect to the region below the ball element, which normally will contain well fluids at hydrostatic pressure. The relatively high fluid pressure upstream or below theball valve 14 will act via theannular clearance space 45 between theretainer ring 25 and thehousing wall 39 on the lower face of thepiston ring 38 and on the upwardly facingshoulder 41 of the retainer ring. The pressure causes thepiston 25 to shift upwardly into engagement with thehousing shoulder 39 to thereby transfer upward force cue to such pressure to thehousing 11. The pressure also acts downwardly on theshoulder 41 over a transverse cross-sectional area that is defined by the difference in diameters of sealing engagement A and B as downward force on theretainer ring 25 to hold the same tightly seated against the outer periphery of theball valve element 14. The downward force is aided by the bias force of thespring 32. - Conversely when the pressure of the well fluids in the
flow passage 12 above theball element 14 is greater than the pressure of well fluids in the flow passage therebelow, such pressure acts downwardly on thepiston ring 38 over a transverse cross-sectional area defined by the difference in the diameters C and A to force the ring downwardly into engagement with theshoulder 41. Thepiston ring 38 transmits force due to such pressure to theretainer ring 45 to hold it in tight sealing engagement with the outer periphery of theball element 14. Here again the downward force is assisted by the bias force of thespring 32. Thus it will be recognized that the pressure responsive valve seat assembly of the present invention is uniquely arranged to coact with theball valve element 14 to prevent fluid leakage therepast, irregardless of whether the predominant fluid pressure is acting on the ball element from below or above. - Since certain changes or modifications may be made in the disclosed embodiment without departing from the inventive concepts involved, it is the aim of the appended claims to cover all such changes and modifications falling within the true spirit and scope of the present invention.
Claims (9)
1. Valve apparatus adapted for use in a well bore, characterized by: tubular housing means defining a flow passage; valve means rotatable about an axis that is transverse to said flow passage between open and closed positions; seat means surrounding said flow passage and having a seat surface and seal means coacting with said valve means in said closed position to block fluid flow through said flow passage; and pressure responsive means for forcing said seat surface against said valve means in response to a predominate pressure either upstream or downstream of said valve means.
2. The apparatus of claim 1 characterized in that said pressure responsive means includes piston means movable relative to said housing and said seat means and being sealingly slidable with respect thereto, said piston means having one side subject to the pressure of fluids upstream of said valve means and the other side subject to the pressure of fluids downstream of said valve means.
3. The apparatus of claim 2 characterized by first seal means between said piston means and said seat means and defining a first seal diameter; second seal means between said piston means and said housing means and defining a second seal diameter, the engagement of said seal means on said seat means with said valve means defining a third seal diameter, said first diameter being lesser than said third diameter.
4. The apparatus of claim 3 characterized in that said second diameter is greater than said third diameter.
5. The apparatus of any one of claims 1-4 characterized by spring means reacting between said seat means and said housing means for biasing said seat means toward said valve means.
6. The apparatus of claim 1 characterized in that valve means comprises a ball valve; in that said seat surface and seal means comprises a retainer ring surrounding said flow passage and having a spherical annular seat surface and carry valve seal means that coact with an outer peripheral surface of said ball valve means in said closed position to block fluid flow through said flow passage; and in that said pressure responsive means comprises floating piston means sealingly engaging said retainer ring and said housing means and movable between limit positions where an upper surface thereof abuts said housing means and a lower surface thereof abuts said retainer rings, said lower surface being subject to the pressure or fluids upstream of said valve means and said upper surface being subject to the pressure of fluids downstream of said valve means.
7. The apparatus of claim 6 characterized by a first seal ring between said piston means and said retainer ring and defining a first seal diameter; and second seal means between said piston means and said housing means and defining a second seal diameter, the engagement of said valve seal means with said outer peripheral surface of said ball valve means definina a third seal diameter, said first diameter being lesser than said third diameter.
8. The apparatus of claim 7 characterized in that said second diameter is greater than said third diameter.
9. The apparatus of claim 8 characterized by spring means reacting between said retainer ring and said housing for biasing said retainer ring toward said ball valve means.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22024180A | 1980-12-23 | 1980-12-23 | |
US220241 | 1980-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0055183A1 true EP0055183A1 (en) | 1982-06-30 |
Family
ID=22822705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81402038A Withdrawn EP0055183A1 (en) | 1980-12-23 | 1981-12-21 | Pressure responsive valve seat apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0055183A1 (en) |
AU (1) | AU7878181A (en) |
BR (1) | BR8108355A (en) |
ES (1) | ES8300925A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0174857A2 (en) * | 1984-09-12 | 1986-03-19 | Halliburton Company | Well tool with improved valve support structure |
WO1997048880A2 (en) * | 1996-06-17 | 1997-12-24 | Petroline Wellsystems Limited | Downhole apparatus |
AU761991B2 (en) * | 1996-06-17 | 2003-06-12 | Weatherford/Lamb Inc. | Downhole apparatus |
CN110905456A (en) * | 2018-09-18 | 2020-03-24 | 中国石油天然气股份有限公司 | Pressure delay ball throwing device |
CN111425165A (en) * | 2020-04-29 | 2020-07-17 | 中国石油大学(华东) | Arc closed ball valve sealing device for pressure maintaining and coring of coal bed gas |
WO2021054939A1 (en) * | 2019-09-17 | 2021-03-25 | Halliburton Energy Services, Inc. | Double acting boost arrangement |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741249A (en) * | 1971-03-22 | 1973-06-26 | Baker Oil Tools Inc | Ball valve with resilient seal |
GB1400057A (en) * | 1971-12-15 | 1975-07-16 | Acf Ind Inc | Fluid flow control valve having fluid pressure actuated sealing members |
US4137936A (en) * | 1977-05-21 | 1979-02-06 | Taimei Kinzoku Kogyo Kabushiki Kaisha | Ball valve |
-
1981
- 1981-12-21 EP EP81402038A patent/EP0055183A1/en not_active Withdrawn
- 1981-12-22 AU AU78781/81A patent/AU7878181A/en not_active Abandoned
- 1981-12-22 BR BR8108355A patent/BR8108355A/en unknown
- 1981-12-22 ES ES508245A patent/ES8300925A1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741249A (en) * | 1971-03-22 | 1973-06-26 | Baker Oil Tools Inc | Ball valve with resilient seal |
GB1400057A (en) * | 1971-12-15 | 1975-07-16 | Acf Ind Inc | Fluid flow control valve having fluid pressure actuated sealing members |
US4137936A (en) * | 1977-05-21 | 1979-02-06 | Taimei Kinzoku Kogyo Kabushiki Kaisha | Ball valve |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0174857A2 (en) * | 1984-09-12 | 1986-03-19 | Halliburton Company | Well tool with improved valve support structure |
EP0174857A3 (en) * | 1984-09-12 | 1988-06-22 | Halliburton Company | Well tool with improved valve support structure |
US6223824B1 (en) | 1996-06-17 | 2001-05-01 | Weatherford/Lamb, Inc. | Downhole apparatus |
WO1997048880A3 (en) * | 1996-06-17 | 1998-04-09 | Petroline Wellsystems Ltd | Downhole apparatus |
GB2331115A (en) * | 1996-06-17 | 1999-05-12 | Petroline Wellsystems Ltd | Downhole apparatus |
GB2331115B (en) * | 1996-06-17 | 2001-01-10 | Petroline Wellsystems Ltd | Downhole apparatus |
WO1997048880A2 (en) * | 1996-06-17 | 1997-12-24 | Petroline Wellsystems Limited | Downhole apparatus |
AU734369B2 (en) * | 1996-06-17 | 2001-06-14 | Weatherford/Lamb Inc. | Downhole apparatus |
AU761991B2 (en) * | 1996-06-17 | 2003-06-12 | Weatherford/Lamb Inc. | Downhole apparatus |
CN110905456A (en) * | 2018-09-18 | 2020-03-24 | 中国石油天然气股份有限公司 | Pressure delay ball throwing device |
WO2021054939A1 (en) * | 2019-09-17 | 2021-03-25 | Halliburton Energy Services, Inc. | Double acting boost arrangement |
GB2601254A (en) * | 2019-09-17 | 2022-05-25 | Halliburton Energy Services Inc | Double acting boost arrangement |
US11448326B2 (en) | 2019-09-17 | 2022-09-20 | Halliburton Energy Services, Inc. | Double acting boost arrangement |
GB2601254B (en) * | 2019-09-17 | 2023-06-14 | Halliburton Energy Services Inc | Double acting boost arrangement |
CN111425165A (en) * | 2020-04-29 | 2020-07-17 | 中国石油大学(华东) | Arc closed ball valve sealing device for pressure maintaining and coring of coal bed gas |
Also Published As
Publication number | Publication date |
---|---|
ES508245A0 (en) | 1982-11-01 |
BR8108355A (en) | 1982-10-13 |
AU7878181A (en) | 1982-07-01 |
ES8300925A1 (en) | 1982-11-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4576234A (en) | Full bore sampler valve | |
US4324293A (en) | Circulation valve | |
US4341266A (en) | Pressure operated test tool | |
US4633952A (en) | Multi-mode testing tool and method of use | |
CA2113402C (en) | Pressure test and bypass valve with rupture disc | |
US4049052A (en) | Subsurface annulus safety valve | |
US4278130A (en) | Access valve for drill stem testing | |
US4736798A (en) | Rapid cycle annulus pressure responsive tester valve | |
US4399870A (en) | Annulus operated test valve | |
US4440230A (en) | Full-bore well tester with hydrostatic bias | |
EP0055183A1 (en) | Pressure responsive valve seat apparatus | |
US4458751A (en) | Method and apparatus for selective disengagement of a fluid transmission conduit operable under oppositely directed pressure differentials | |
US4646845A (en) | Metal seal for wellhead apparatus | |
US4508173A (en) | Flow control valve for use on oil and gas wells or the like | |
GB1579184A (en) | Subsurface safety valve apparatus | |
US4687055A (en) | Wire-line controlled down-hole shut-in tool for wells | |
US3999574A (en) | Hydraulic safety stop-valve | |
US5056600A (en) | Control apparatus and method responsive to a changing stimulus | |
CA1143279A (en) | Method and system for well testing | |
US3500911A (en) | Multiple packer distribution valve and method | |
US4562854A (en) | Piston actuated chemical injection valve | |
EP0053983A1 (en) | Composite ball valve seal assembly | |
US4295361A (en) | Drill pipe tester with automatic fill-up | |
US4444267A (en) | Ball valve housing | |
US4471841A (en) | Pressure balanced valve |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19830606 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MCGILL, HOWARD L. |