CN107893644B - Underground hydraulic control device - Google Patents
Underground hydraulic control device Download PDFInfo
- Publication number
- CN107893644B CN107893644B CN201710993159.1A CN201710993159A CN107893644B CN 107893644 B CN107893644 B CN 107893644B CN 201710993159 A CN201710993159 A CN 201710993159A CN 107893644 B CN107893644 B CN 107893644B
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- ball seat
- floating
- wall
- closing
- closing sleeve
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- 238000007667 floating Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims 4
- 241001330002 Bambuseae Species 0.000 claims 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 4
- 239000011425 bamboo Substances 0.000 claims 4
- 238000010276 construction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000003129 oil well Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction 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
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
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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)
- Check Valves (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention relates to a downhole hydraulic control device. The technical scheme is as follows: the middle upper part of the central pipe is connected with the upper joint through an opening shear pin, the bottom of the central pipe is matched with the steel ball, the upper part of the steel ball is in contact sealing with the fixed ball seat, the lower part of the steel ball is in contact sealing with the floating ball seat, and the lower part of the floating ball seat is fixed on a step of the inner cavity of the lower joint through a spring; the upper portion of the fixed ball seat is in contact with the closing sleeve, the closing sleeve is arranged on the inner wall of the outer barrel, the outer wall of the closing sleeve is connected with the inner wall of the outer barrel through the closing shear pin, the inner wall of the closing sleeve is movably connected with the central pipe through the locking ring, and a liquid inlet channel is formed in the outer barrel located on the lower portion of the closing shear pin. The beneficial effects are as follows: the invention has simple process and convenient construction, shortens the construction period and reduces the construction cost; the non-pressure operation of the wellhead can be realized, and no pressure operation equipment or killing operation is needed; the hydraulic opening and closing is safe and reliable; the blowout prevention device can be matched with other tools to prevent blowout.
Description
Technical Field
The invention relates to a control device in an oil extraction process of an oil field, in particular to an underground hydraulic control device.
Background
In the process of oil well exploitation, the pressure of individual block land is high, overflow exists at a wellhead, and the wellhead needs equipment with pressure to carry out construction operation or construction operation is carried out after a well killing hydraulic well is adopted; 1) the killing fluid needs to have high density and certain pollution to the stratum; 2) the wellhead pressurized equipment is adopted, so that the cost is high and the construction period is long; 3) the prior tool can not realize the non-pressure of a well mouth when the oil pipe is lowered and the sucker rod and the oil pipe are lifted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the underground hydraulic control device, which realizes the non-pressure operation of a wellhead, prevents blowout, simplifies construction operation, shortens construction period and saves operation cost.
The invention provides an underground hydraulic control device, which adopts the technical scheme that: comprises an upper joint (1), an inner and outer communicating channel (2), an opening shear pin (5), an outer cylinder (6), a central pipe (7), a closing shear pin (10), a locking ring (11), a liquid inlet channel (12), a closing sleeve (13), a fixed ball seat (18), a steel ball (19), a floating ball seat (20), a spring (21) and a lower joint (23), wherein the upper end and the lower end of the outer cylinder (6) are respectively movably connected with the upper joint (1) and the lower joint (23), the middle lower part of the upper joint (1) is provided with one or more groups of inner and outer communicating channels (2) which are communicated with the central pipe (7) in the upper joint (1) through the inner and outer communicating channels (2), the middle upper part of the central pipe (7) is connected with the upper joint (1) through the opening shear pin (5), the bottom of the central pipe (7) is matched with the steel ball (19), and the upper part of the steel, the lower part of the floating ball seat (20) is in contact sealing with the floating ball seat, and the lower part of the floating ball seat (20) is fixed on a step of an inner cavity of a lower joint (23) through a spring (21); the upper portion of the fixed ball seat (18) is in contact with the closing sleeve (13), the closing sleeve (13) is arranged on the inner wall of the outer barrel (6), the outer wall of the closing sleeve (13) is connected with the inner wall of the outer barrel (6) through the closing shear pin (10), the inner wall of the closing sleeve (13) is movably connected with the central pipe (7) through the locking ring (11), and a liquid inlet channel (12) is formed in the outer barrel (6) located on the lower portion of the closing shear pin (10).
Preferably, the lower end of the central tube (7) is provided with a flow passage (444), when the valve is opened and pressed, liquid is sprayed to the steel ball (19) through an inner annular space (111) of the central tube in the central tube (7) and the flow passage (444) at the lower end of the central tube (7), and the steel ball (19) is pressed down.
Preferably, the inner side of the bottom of the fixed ball seat (18) is provided with an arc-shaped surface matched with the steel ball (19), the outer side of the fixed ball seat is provided with a raised step which is supported and fixed with the bottom of the outer cylinder (6), the middle of the fixed ball seat (18) is of a cylindrical structure, the inner part of the fixed ball seat is hermetically connected with the outer wall of the central tube (7) through a sixth O-shaped ring (16), and the outer part of the fixed ball seat is hermetically connected with the inner wall of the outer cylinder (6) through a seventh O-shaped ring (.
Preferably, the outer side of the closing sleeve (13) is provided with a convex part, the closing sleeve (13) is fixedly supported through the mutual matching of the convex part and the convex part of the inner wall of the outer cylinder (6), the inner side of the closing sleeve (13) is provided with two groups of grooves, the upper groove is provided with a baffle ring (8), the lower groove is provided with a lock ring (11), the position of the lock ring (11) is limited by the baffle ring (8), the lock ring (11) is internally provided with a first one-way sawtooth thread (888), the outer wall of the central tube (7) is provided with a second one-way sawtooth thread (999), and the lock ring (11) is matched with the second one-way sawtooth thread (999) of the central tube (7) through the first one-way sawtooth thread (.
Preferably, a support ring (22) is arranged on a step of an inner cavity of the lower joint (23), the spring (21) is supported and limited, the support ring (22) consists of a base part and a support part, the diameter of the base part is larger than the outer diameter of the support part, the base part is connected with the step of the inner cavity of the lower joint (23), and the support part is provided with a plurality of fourth overflowing channels (777).
Preferably, foretell floating ball seat (20) comprise floating base and the supporting cylinder that floats, floating base's upper portion be equipped with steel ball (19) complex arcwall face, and floating base's external diameter is greater than the external diameter of the supporting cylinder that floats, be equipped with multiunit third on the supporting cylinder and flow through passageway (666), and float and have spring (21) between the supporting part on supporting cylinder and the supporting ring (22).
Preferably, a plurality of groups of second flow passages (555) are arranged on the floating base of the floating ball seat (20).
The invention has the beneficial effects that: according to the invention, the sleeve is pressed to 5MPa, and the shear pin is cut and opened, so that the opening of the channel is realized; then, the sleeve is pressed to 15MPa, and the shear pin is cut off and closed to close the channel; a steel ball is arranged in the channel to realize the sealing of the channel; the channel is unlocked and locked through the locking ring and the one-way sawtooth thread of the central tube; the floating ball seat and the support ring are supported by a spring; the central tube, the fixed ball seat, the floating ball seat and the support ring are all provided with a flow passage; moving the central tube downwards to jack the steel ball to open the channel; the channel closing sleeve drives the central tube to move upwards to realize channel closing;
the invention has simple process and convenient construction, shortens the construction period and reduces the construction cost; the non-pressure operation of the wellhead can be realized, and no pressure operation equipment or killing operation is needed; the hydraulic opening and closing is safe and reliable; the blowout prevention device can be matched with other tools to prevent blowout.
Drawings
FIG. 1 is a schematic overall structure of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view C-C of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1;
FIG. 6 is a cross-sectional view E-E of FIG. 1;
FIG. 7 is an enlarged view of a portion of a single direction buttress thread of the center tube at F and a portion of a check ring single direction buttress thread at G of FIG. 1;
in the upper diagram: an upper joint 1, an internal and external communicating channel 2, a first O-ring 3, a second O-ring 4, an opening shear pin 5, an outer cylinder 6, a central pipe 7, a baffle ring 8, a third O-ring 9, a closing shear pin 10, a locking ring 11, a liquid inlet channel 12, a closing sleeve 13, a fourth O-ring 14, a fifth O-ring 15, a sixth O-ring 16, a seventh O-ring 17, a fixed ball seat 18, a steel ball 19, a floating ball seat 20, a spring 21, a supporting ring 22 and a lower joint 23,
the central tube inner annulus 111, the annulus 222, the opening 333, the first flow passage 444, the second flow passage 555, the third flow passage 666, the fourth flow passage 777, the first one-way serrated thread 888 and the second one-way serrated thread 999.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1: referring to the attached figure 1, the invention provides a downhole hydraulic control device, which adopts the technical scheme that: the movable type shear pin sealing device comprises an upper connector 1, an internal and external communicating channel 2, an opening shear pin 5, an outer cylinder 6, a central tube 7, a closing shear pin 10, a locking ring 11, a liquid inlet channel 12, a closing sleeve 13, a fixed ball seat 18, a steel ball 19, a floating ball seat 20, a spring 21 and a lower connector 23, wherein the upper end and the lower end of the outer cylinder 6 are respectively movably connected with the upper connector 1 and the lower connector 23, six groups of internal and external communicating channels 2 are arranged at the middle lower part of the upper connector 1 and are communicated with the central tube 7 in the upper connector 1 through the internal and external communicating channels 2, the middle upper part of the central tube 7 is connected with the upper connector 1 through the opening shear pin 5, the bottom of the central tube 7 is matched with the steel ball 19, the upper part of the steel ball 19 is in contact sealing with the fixed ball seat 18, the lower part; the upper part of the fixed ball seat 18 is in contact with the closing sleeve 13, the closing sleeve 13 is arranged on the inner wall of the outer barrel 6, the outer wall of the closing sleeve 13 is connected with the inner wall of the outer barrel 6 through the closing shear pin 10, the inner wall of the closing sleeve 13 is movably connected with the central pipe 7 through the locking ring 11, and the outer barrel 6 located at the lower part of the closing shear pin 10 is provided with a liquid inlet channel 12.
Referring to fig. 2, the lower end of the central tube 7 is provided with a flow passage 444, when the valve is opened and pressed, liquid is sprayed to the steel ball 19 through the inner annular space 111 of the central tube in the central tube 7 and the flow passage 444 at the lower end of the central tube 7, and the steel ball 19 is pressed down.
Referring to the attached drawings 1, 5 and 6, the inner side of the bottom of the fixing ball seat 18 of the invention is provided with an arc surface matched with a steel ball 19, the outer side is provided with a raised step to be supported and fixed with the bottom of the outer cylinder 6, the middle part of the fixing ball seat 18 is of a cylindrical structure, the inner part of the fixing ball seat is hermetically connected with the outer wall of the central tube 7 through a sixth O-shaped ring 16, and the outer part of the fixing ball seat is hermetically connected with the inner wall of the outer cylinder 6 through a seventh O.
Referring to the attached drawings 1 and 4, the outer side of the closing sleeve 13 of the invention is provided with a convex part, the closing sleeve 13 is fixedly supported by the convex part and the convex part on the inner wall of the outer cylinder 6 in a matching way, the inner side of the closing sleeve 13 is provided with two groups of grooves, the upper groove is provided with a baffle ring 8, the lower groove is provided with a lock ring 11, the limit of the lock ring 11 is realized by the baffle ring 8, the lock ring 11 is internally provided with a first one-way sawtooth thread 888, the outer wall of the central tube 7 is provided with a second one-way sawtooth thread 999, and the lock ring 11 is matched with the second one-way sawtooth thread 999 of the central tube 7 by.
Referring to fig. 1, a support ring 22 is installed on a step of an inner cavity of a lower joint 23, and supports and limits a spring 21, the support ring 22 is composed of a base portion and a support portion, the diameter of the base portion is larger than the outer diameter of the support portion, the base portion is connected with the step of the inner cavity of the lower joint 23, and the support portion is provided with a plurality of fourth overflowing passages 777.
Referring to fig. 1, the floating ball seat 20 of the present invention is composed of a floating base and a floating support cylinder, wherein the upper portion of the floating base is provided with an arc surface matched with the steel ball 19, the outer diameter of the floating base is larger than that of the floating support cylinder, the floating support cylinder is provided with a plurality of sets of third flow-through channels 666, and a spring 21 is sleeved between the floating support cylinder and a support part on the support ring 22.
Referring to fig. 6, a plurality of sets of second flow passages 555 are formed in the floating seat of the floating ball seat 20 according to the present invention.
Referring to the attached figure 1, the middle part of the outer wall of the central tube 7 is provided with a limiting bulge, and the limiting bulge is in contact fit with the bottom of the upper joint 1; the diameter of the central pipe 7 is larger than that of the blocking bulge at the upper part of the upper joint 1, so that the central pipe 7 moves in a cavity among the upper joint, the outer cylinder and the lower joint.
The invention provides a using method of a downhole hydraulic control device, which comprises the following steps:
(a) the connecting pipe fittings are put into the well: the lower end of the oil well pump is connected through an upper connector 1, the check valve is connected through a lower connector 23, and the wellhead is fixed after the check valve is lowered to a designed position below the pumping well;
(b) and (3) a channel opening process: pressing 5MPa from a casing in an oil well, enabling hydraulic pressure to enter an annular space 222 between an upper joint 1 and a central pipe 7 and an inner annular space 111 of the central pipe through an inner and outer communicating channel 2 of the upper joint, enabling the hydraulic pressure to act on the upper end surface of the central pipe 7, pushing the central pipe 7 to move downwards, cutting short and opening a shear pin 5, enabling the lower end of the central pipe 7 to push a steel ball 19, enabling the steel ball 19 to drive a floating ball seat 20 to compress a spring 21, enabling a one-way locking of a one-way sawtooth thread 999 of a locking ring 11 and a one-way sawtooth thread 888 of the central pipe 7 to be achieved, enabling the central pipe (7) to;
(c) and (3) a channel closing process: before the pipe string is lifted, a sleeve is pressurized to 15MPa, hydraulic pressure enters through the liquid inlet channel 12, the hydraulic pressure acts on the lower end face of the closing sleeve 13, the closing sleeve 13 is pushed to move upwards to cut off the closing pin 10, the closing sleeve 13 pushes the locking ring 11 and the blocking ring 8, the central pipe 7 is driven to move upwards through the locking ring 11, the lower end face of the central pipe 7 leaves the steel ball 19, the steel ball 19 pushes the floating ball seat 20 to move upwards to reset under the action of the spring 21, the steel ball 19 and the fixed ball seat 18 are sealed, the channel is closed, no pressure exists in the pipe string after the channel is closed, and.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (6)
1. A downhole hydraulic control device is characterized in that: comprises an upper joint (1), an inner and outer communicating channel (2), an opening shear pin (5), an outer cylinder (6), a central pipe (7), a closing shear pin (10), a locking ring (11), a liquid inlet channel (12), a closing sleeve (13), a fixed ball seat (18), a steel ball (19), a floating ball seat (20), a spring (21) and a lower joint (23), wherein the upper end and the lower end of the outer cylinder (6) are respectively movably connected with the upper joint (1) and the lower joint (23), the middle lower part of the upper joint (1) is provided with one or more groups of inner and outer communicating channels (2) which are communicated with the central pipe (7) in the upper joint (1) through the inner and outer communicating channels (2), the middle upper part of the central pipe (7) is connected with the upper joint (1) through the opening shear pin (5), the bottom of the central pipe (7) is matched with the steel ball (19), and the upper part of the steel, the lower part of the floating ball seat (20) is in contact sealing with the floating ball seat, and the lower part of the floating ball seat (20) is fixed on a step of an inner cavity of a lower joint (23) through a spring (21); the upper part of the fixed ball seat (18) is in contact with a closing sleeve (13), the closing sleeve (13) is arranged on the inner wall of the outer barrel (6), the outer wall of the closing sleeve (13) is connected with the inner wall of the outer barrel (6) through a closing shear pin (10), the inner wall of the closing sleeve (13) is movably connected with the central pipe (7) through a locking ring (11), and a liquid inlet channel (12) is arranged on the outer barrel (6) positioned at the lower part of the closing shear pin (10);
the outer side of the closing sleeve (13) is provided with a convex part, the closing sleeve (13) is fixedly supported through the mutual matching of the convex part and the convex part of the inner wall of the outer barrel (6), the inner side of the closing sleeve (13) is provided with two groups of grooves, the upper groove is provided with a baffle ring (8), the lower groove is provided with a lock ring (11), the position of the lock ring (11) is limited by the baffle ring (8), the inside of the lock ring (11) is provided with a first one-way sawtooth thread (888), the outer wall of the central tube (7) is provided with a second one-way sawtooth thread (999), and the lock ring (11) is matched with the second one-way sawtooth thread (999) of the central tube (7) through the first one-way sawtooth.
2. A downhole hydraulic control device according to claim 1, wherein: the lower end of the central tube (7) is provided with a flow passage (444), when the central tube is opened and pressed, liquid is sprayed to the steel ball (19) through an inner annular space (111) of the central tube in the central tube (7) and the flow passage (444) at the lower end of the central tube (7), and the steel ball (19) is pressed down.
3. A downhole hydraulic control device according to claim 1, wherein: the inboard of the bottom of fixed ball seat (18) is equipped with the arcwall face with steel ball (19) complex, and the outside is equipped with the bellied step and is fixed with the bottom sprag of urceolus (6), the middle part of fixed ball seat (18) is the cylindrical structure, and inside and the outer wall of center tube (7) pass through sixth O type circle (16) sealing connection, and the outside passes through seventh O type circle (17) sealing connection with the inner wall of urceolus (6).
4. A downhole hydraulic control device according to claim 1, wherein: a support ring (22) is arranged on a step of an inner cavity of the lower joint (23), the spring (21) is supported and limited, the support ring (22) is composed of a base part and a support part, the diameter of the base part is larger than the outer diameter of the support part, the base part is connected with the step of the inner cavity of the lower joint (23), and the support part is provided with a plurality of fourth overflowing channels (777).
5. A downhole hydraulic control device according to claim 4, wherein: floating ball seat (20) constitute by a floating base and a floating support section of thick bamboo, the upper portion of floating base be equipped with steel ball (19) complex arcwall face, and the external diameter of floating base is greater than the external diameter of a floating support section of thick bamboo, it overflows passageway (666) to be equipped with the multiunit third on the floating support section of thick bamboo, and the cover has spring (21) between the support section on floating support section of thick bamboo and support ring (22).
6. A downhole hydraulic control device according to claim 5, wherein: and a plurality of groups of second overflowing channels (555) are arranged on the floating base of the floating ball seat (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993159.1A CN107893644B (en) | 2017-12-27 | 2017-12-27 | Underground hydraulic control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993159.1A CN107893644B (en) | 2017-12-27 | 2017-12-27 | Underground hydraulic control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107893644A CN107893644A (en) | 2018-04-10 |
| CN107893644B true CN107893644B (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710993159.1A Active CN107893644B (en) | 2017-12-27 | 2017-12-27 | Underground hydraulic control device |
Country Status (1)
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| CN (1) | CN107893644B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905447B (en) * | 2018-09-18 | 2022-03-01 | 中国石油天然气股份有限公司 | Underground switch device |
| CN109322640B (en) * | 2018-12-11 | 2023-12-22 | 山东博赛特石油技术有限公司 | Hydraulic packing communicating vessel |
| CN110821438B (en) * | 2019-12-09 | 2024-04-05 | 天津轻工职业技术学院 | Blowout preventer for rod-driven screw pump oil extraction system |
| CN111677480B (en) * | 2020-06-04 | 2022-11-08 | 大庆油田有限责任公司 | Double-acting control valve for casing patching |
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|---|---|---|---|---|
| CN2451730Y (en) * | 2000-09-29 | 2001-10-03 | 胜利石油管理局采油工艺研究院 | Hydraulic seam change switch |
| CN2679356Y (en) * | 2004-03-01 | 2005-02-16 | 赵广友 | Chemical agent injection underground unidirectional flow control device |
| CN201513157U (en) * | 2009-09-04 | 2010-06-23 | 中国石油天然气集团公司 | Inverse well-flushing double seal check valve |
| WO2015167757A1 (en) * | 2014-04-29 | 2015-11-05 | Baker Hughes Incorporated | Selectively operated two way check valve for subterranean use |
| CN205778715U (en) * | 2016-04-15 | 2016-12-07 | 吴江 | One-way hydraulic formula is exempted to bore fraclional well cementing device |
| CN206190265U (en) * | 2016-11-25 | 2017-05-24 | 山东创佳石油机械制造有限公司 | Empty core rod water mixing single current valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9145758B2 (en) * | 2011-06-09 | 2015-09-29 | Baker Hughes Incorporated | Sleeved ball seat |
-
2017
- 2017-12-27 CN CN201710993159.1A patent/CN107893644B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2451730Y (en) * | 2000-09-29 | 2001-10-03 | 胜利石油管理局采油工艺研究院 | Hydraulic seam change switch |
| CN2679356Y (en) * | 2004-03-01 | 2005-02-16 | 赵广友 | Chemical agent injection underground unidirectional flow control device |
| CN201513157U (en) * | 2009-09-04 | 2010-06-23 | 中国石油天然气集团公司 | Inverse well-flushing double seal check valve |
| WO2015167757A1 (en) * | 2014-04-29 | 2015-11-05 | Baker Hughes Incorporated | Selectively operated two way check valve for subterranean use |
| CN205778715U (en) * | 2016-04-15 | 2016-12-07 | 吴江 | One-way hydraulic formula is exempted to bore fraclional well cementing device |
| CN206190265U (en) * | 2016-11-25 | 2017-05-24 | 山东创佳石油机械制造有限公司 | Empty core rod water mixing single current valve |
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| CN107893644A (en) | 2018-04-10 |
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