CN109695435B - Underground safety valve and use method thereof - Google Patents
Underground safety valve and use method thereof Download PDFInfo
- Publication number
- CN109695435B CN109695435B CN201910139876.7A CN201910139876A CN109695435B CN 109695435 B CN109695435 B CN 109695435B CN 201910139876 A CN201910139876 A CN 201910139876A CN 109695435 B CN109695435 B CN 109695435B
- Authority
- CN
- China
- Prior art keywords
- valve plate
- main valve
- central tube
- triangular
- fixing sleeve
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 210000001503 joint Anatomy 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 16
- 230000003628 erosive effect Effects 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 10
- 230000002265 prevention Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/05—Flapper valves
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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)
Abstract
The invention discloses an underground safety valve and a use method thereof.A top connector is connected with an intermediate connector, and the other end of the intermediate connector is connected with a bottom connector; the main valve plate is fixedly sleeved on the central tube and embedded at the upper part of the middle joint; the outer part of the central tube is embedded with a spring upper ring sleeved with the inner part of the middle joint; the spring is sleeved outside the central tube; the lower part of the central tube is sleeved with a lower clamping ring at the position embedded in the lower joint, the inner bottom of the lower joint is nested with a triangular valve plate fixing sleeve, the bottom of the piston is matched with the triangular valve plate fixing sleeve, the main valve plate is arranged on the main valve plate fixing sleeve, and the triangular valve plate is connected with the piston. The safety valve has the advantages that the structure is simple, the sealing effect is good, the triangular valve plate can improve the oil pumping efficiency during oil pumping, the main valve plate can not be contacted with oil, the service life of the safety valve is prolonged, and when oil pumping is stopped, backflow can be effectively prevented through the triangular valve plate and the main valve plate, so that blowout is prevented.
Description
Technical Field
The invention relates to an underground safety valve and a use method thereof, and belongs to the technical field of oil and gas exploitation.
Background
Currently, in oil and gas exploitation of an oil and gas well, when an emergency is encountered, an underground safety valve is often required to be installed to close a fluid channel in time so as to prevent blowout or overflow. The single valve structure in the existing underground safety valve cannot ensure that the safety valve is automatically closed when in failure; if the double-valve plate structure is adopted, a ball valve is required to be selected, but the reliability is poor, and when the safety valve fails to work well, the safety valve is difficult to open through a pump pressure; even the double-valve plate structure is selected, the service life of the safety valve is often shortened due to the impact on the pipe wall when the valve plate is opened.
Disclosure of Invention
The invention aims to provide an underground safety valve with backflow prevention, blowout prevention, simple structure, good sealing effect and oil extraction rate guarantee and a use method.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: the underground safety valve comprises an upper joint, an intermediate joint, a spring, a central tube, a triangular valve plate, a lower joint, a piston and a main valve plate, wherein the upper joint is connected with the intermediate joint, and the other end of the intermediate joint is connected with the lower joint; a central tube is arranged in a safety valve cavity formed by the upper joint, the middle joint and the lower joint; the main valve plate is fixedly sleeved on the central tube and embedded at the upper part of the middle joint; the outer part of the central tube is embedded with a spring upper ring sleeved with the inner part of the middle joint; the spring is sleeved outside the central tube, and the top end of the spring is in contact limit with the upper ring of the spring; the lower clamping ring is sleeved at the lower part of the central pipe and embedded in the position of the lower joint, the triangular valve plate fixing sleeve is sleeved at the inner bottom of the lower joint, the bottom of the piston is matched with the triangular valve plate fixing sleeve, the main valve plate is arranged on the main valve plate fixing sleeve, and the triangular valve plate is connected with the piston.
The upper joint and the middle joint are respectively connected with the lower joint by threads; the triangular valve plate fixing sleeve and the inner cavity of the lower joint form sliding fit connection.
The central tube comprises a first central tube and a second central tube which are connected in a butt joint mode, a groove for installing an O-shaped ring is formed in the top of the central tube, a central tube boss for limiting the position of an upper ring of the spring is arranged on the first central tube, a guide groove is formed in the lower portion of the second central tube, and an overflow hole is formed in the lower portion of the second central tube.
The main valve plate fixing sleeve is connected with the middle joint through threads, a shoulder for installing a main valve plate is arranged on the main valve plate fixing sleeve, a rectangular groove is formed in the shoulder, and the main valve plate is installed in the rectangular groove through a main valve plate pin; the main valve plate fixing sleeve is characterized in that a main valve plate fixing sleeve O-shaped ring groove is formed in the main valve plate fixing sleeve, and a main valve plate fixing sleeve O-shaped ring is arranged in the main valve plate fixing sleeve O-shaped ring groove.
The outer diameter of the main valve plate is larger than the inner diameter of the main valve plate fixing sleeve and smaller than the outer diameter of the main valve plate fixing sleeve, so that the main valve plate cannot be completely opened due to overlarge outer diameter when being opened; the inner diameter of the main valve plate is smaller than that of the main valve plate fixing sleeve, and the main valve plate is provided with a main valve plate torsion spring.
The lower clamping ring is arranged at the upper part of the lower joint through threaded connection, and an installation groove for installing an O-shaped ring of the lower clamping ring is processed on the inner wall of the upper part of the lower clamping ring; the bottom of the spring is in contact fit with the upper end face of the lower clamping ring.
The inner cavities of the piston and the triangular valve plate fixing sleeve are connected through threads, guide bosses matched with the guide grooves of the central tube are machined on the piston, a plurality of groups of uniformly distributed piston shoulders used for installing pins are arranged in the cavity of the piston, and through holes for installing the pins are machined on the piston shoulders.
An annular cavity is formed between the inner wall of the piston and the outer wall of the lower part of the central tube, the annular cavity is positioned below the lower clamping ring, a central tube bottom groove is formed in the bottom of the central tube, and the central tube bottom groove is matched with a piston shoulder on the piston, so that when the triangular valve plate is closed, the triangular valve plate can be effectively clamped to prevent blowout; and a piston O-shaped ring matched with the lower joint is arranged outside the upper part of the piston.
The triangular valve plate is connected with the piston through a triangular valve plate pin, the triangular valve plate is of a fan-shaped structure, and a triangular valve plate torsion spring is arranged on the triangular valve plate and is used for automatically closing when mining is stopped.
The method for using the subsurface safety valve according to any one of the following:
during normal operation, the triangular valve plate and the main valve plate are in an open state, and meanwhile, the main valve plate is separated from the fluid through the central pipe, so that the erosion of the fluid to the main valve plate is slowed down;
when the working is stopped, the central tube compresses the spring through the upper ring of the spring under the action of oil, and moves downwards along the guide groove of the piston, the oil enters the annular cavity through the overflow hole, so that the downward movement of the central tube is further ensured, meanwhile, the main valve plate slowly moves downwards under the action of the torsion spring of the main valve plate along with the downward movement of the central tube, and finally is attached to the upper part of the main valve plate fixing sleeve to block the oil on the upper part of the safety valve; as the upper layer oil is closed, the triangular valve plate starts to move downwards under the action of the triangular valve plate torsion spring and overcomes the acting force of the oil, the central tube continues to move downwards under the action of the annular cavity oil and self gravity, after the triangular valve plate closes the channel, the central tube moves to the bottommost part, and the groove at the bottom of the central tube clamps the triangular valve plate, so that the triangular valve plate is kept in a closed state, and blowout is prevented;
when the operation is restarted, along with the oil liquid on the upper part of the main valve plate is extracted, the central pipe jacks up the main valve plate to move upwards under the action of the spring, meanwhile, the restriction of the triangular valve plate is relieved, the oil liquid is slowly opened under the action of the oil liquid and the internal and external pressure difference, the oil liquid enters the central pipe, the central pipe continues to move upwards under the action of the oil liquid and the spring, the triangular valve plate is completely opened, and meanwhile, the main valve plate is also completely opened along with the upward movement of the central pipe, and the fluid channel is restored to a normal smooth state.
The invention has the following beneficial effects:
1. the safety valve has the advantages of simple structure and good sealing effect; when oil is pumped, the triangular valve plate can improve the pumping efficiency, the main valve plate can not be contacted with oil, the service life of the safety valve is prolonged, and when oil pumping is stopped, backflow prevention can be effectively realized through the triangular valve plate and the main valve plate, and blowout is prevented.
2. The outer diameter of the main valve plate is larger than the inner diameter of the main valve plate fixing sleeve and smaller than the outer diameter of the main valve plate fixing sleeve, so that the main valve plate cannot be completely opened due to overlarge outer diameter when being opened.
3. The inner wall of the piston, the outer wall of the central tube and the bottom of the lower clamping ring form an annular cavity, the bottom of the central tube is provided with a central tube bottom groove matched with the shoulder of the piston, and when the triangular valve plate is closed, the triangular valve plate can be effectively clamped by the central tube bottom groove to prevent blowout.
4. The triangular valve plate is connected with the piston through the pin, and is in a fan-shaped design, so that the triangular valve plate can be completely opened when the sealing requirement is met, the working efficiency is improved, and the triangular valve plate is provided with a torsion spring, so that the triangular valve plate can be automatically closed when mining is stopped.
5. When the valve is in normal operation, the triangular valve plate and the main valve plate are in an open state, and meanwhile, the main valve plate and the fluid are separated through the central tube, so that the erosion of the fluid to the main valve plate can be slowed down, the service life of the main valve plate is prolonged, and the tightness of the safety valve is effectively ensured by the metal threaded connection of the piston and the triangular valve plate fixing sleeve.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a cross-sectional view of a subsurface safety valve.
Fig. 2 is a cross-sectional view A-A of fig. 1.
Fig. 3 is a sectional view of B-B in fig. 1.
FIG. 4 is a schematic view of a main valve plate fixing sleeve.
Fig. 5 is a cross-sectional view of the piston.
Fig. 6 is an enlarged view of the bottom of the center tube.
Fig. 7 is an enlarged cross-sectional view of the bottom of the center tube.
In the figure: the valve plate comprises an upper joint 1, a main valve plate fixing sleeve O-shaped ring 2, a central tube boss 3, a spring upper ring 4, an intermediate joint 5, a spring 6, a lower clamping ring O-shaped ring 7, a central tube 8, a triangular valve plate 9, a triangular valve plate fixing sleeve 10, a lower joint 11, a piston 12, a triangular valve plate pin 13, a triangular valve plate torsion spring 14, a piston O-shaped ring 15, a lower clamping ring 16, a main valve plate fixing sleeve 17, a main valve plate pin 18, a main valve plate 19, a main valve plate torsion spring 20, a guide boss 21, an overflow hole 22, a guide groove 23, an annular cavity 24, a first central tube 25, a second central tube 26, a central tube bottom groove 27, a rectangular groove 28, a piston shoulder 29 and a main valve plate fixing sleeve O-shaped ring groove 30.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-7, a downhole safety valve comprises an upper joint 1, an intermediate joint 5, a spring 6, a central tube 8, a triangular valve plate 9, a lower joint 11, a piston 12 and a main valve plate 19, wherein the upper joint 1 is connected with the intermediate joint 5, and the other end of the intermediate joint 5 is connected with the lower joint 11; a central tube 8 is arranged in a safety valve cavity formed by the upper joint 1, the middle joint 5 and the lower joint 11; the main valve plate fixing sleeve 17 is sleeved on the central tube 8 and embedded at the upper part of the middle joint 5; the spring upper ring 4 is sleeved outside the central tube 8 and embedded inside the middle joint 5; the spring 6 is sleeved outside the central tube 8, and the top end of the spring is in contact limit with the spring upper ring 4; the lower part of the central tube 8 is internally sleeved with a lower clamping ring 16 at the position embedded in the lower joint 11, the inner bottom of the lower joint 11 is nested with a triangular valve plate fixing sleeve 10, the bottom of the piston 12 is matched with the triangular valve plate fixing sleeve 10, the main valve plate 19 is arranged on a main valve plate fixing sleeve 17, and the triangular valve plate 9 is connected with the piston 12. The safety valve with the structure has the advantages that the structure is simple, the sealing effect is good, the triangular valve plate can improve the oil pumping efficiency during oil pumping, the main valve plate can not be in contact with oil, the service life of the safety valve is prolonged, and backflow prevention can be effectively realized through the triangular valve plate and the main valve plate when oil pumping is stopped, so that blowout is prevented.
Further, the upper joint 1 and the middle joint 5 and the lower joint 11 are respectively connected by screw threads; the triangular valve plate fixing sleeve 10 and the inner cavity of the lower joint 11 form sliding fit connection. Through adopting threaded connection's mode, made things convenient for the direct quick assembly of two adjacent joints and dismantlement, and then improved assembly efficiency, through adopting sliding fit's mode, guaranteed the slip that can be convenient between the two.
Further, the central tube 8 comprises a first central tube 25 and a second central tube 26 which are connected in a butt joint mode, a groove for installing an O-shaped ring is formed in the top of the central tube 8, a central tube boss 3 for limiting the position of the upper spring ring 4 is arranged on the first central tube 25, and a guide groove 23 is formed in the lower portion of the second central tube 26. The center tube 8 assembled by adopting the method facilitates the assembly process and the processing thereof.
Further, the main valve plate fixing sleeve 17 is connected with the middle joint 5 through threads, a shoulder for installing a main valve plate is arranged on the main valve plate fixing sleeve 17, a rectangular groove 28 is formed in the shoulder, and the main valve plate 19 is installed in the rectangular groove 28 through a main valve plate pin 18; the main valve plate fixing sleeve 17 is internally provided with a main valve plate fixing sleeve O-shaped ring groove 30, and the main valve plate fixing sleeve O-shaped ring 2 is arranged in the main valve plate fixing sleeve O-shaped ring groove 30. The sealing effect is ensured by the sealing effect of the main valve plate fixing sleeve O-shaped ring 2.
Further, the outer diameter of the main valve plate 19 is larger than the inner diameter of the main valve plate fixing sleeve 17 and smaller than the outer diameter of the main valve plate fixing sleeve 17, so that the main valve plate 19 cannot be completely opened due to overlarge outer diameter when being opened; the inner diameter of the main valve plate 19 is smaller than the inner diameter of the main valve plate fixing sleeve 17, and a main valve plate torsion spring 20 is arranged on the main valve plate 19.
Further, the lower clamping ring 16 is installed at the upper part of the lower joint 11 through threaded connection, and an installation groove for installing the lower clamping ring O-shaped ring 7 is processed on the inner wall of the upper part of the lower clamping ring 16; the bottom end of the spring 6 is in contact fit with the upper end face of the lower clamping ring 16.
Further, the piston 12 is connected with the inner cavity of the triangular valve plate fixing sleeve 10 through threads, a guide boss 21 matched with a guide groove 23 of the central tube 8 is processed on the piston 12, a plurality of groups of uniformly distributed piston shoulders 29 used for mounting pins are arranged in the cavity of the piston 12, and through holes for mounting pins are processed on the piston shoulders 29. Through the above-mentioned overflow hole 22, it is ensured that when stopping working, the central tube compresses the spring 6 through the spring upper ring 4 under the action of oil, and moves downwards along the guide groove of the piston, and oil enters the ring cavity through the overflow hole.
Further, an annular cavity 24 is formed between the inner wall of the piston 12 and the lower outer wall of the central tube 8, the annular cavity 24 is located below the lower clamping ring 16, a central tube bottom groove 27 is formed in the bottom of the central tube 8, the central tube bottom groove 27 is matched with a piston shoulder 29 on the piston 12, and when the triangular valve plate 9 is closed, the triangular valve plate 9 can be effectively clamped to prevent blowout; the upper outer part of the piston 12 is provided with a piston O-ring 15 for cooperation with the lower joint 11.
Further, the triangular valve plate 9 is connected with the piston 12 through the triangular valve plate pin 13, and the triangular valve plate 9 has a fan-shaped structure, so that the triangular valve plate can be completely opened when the sealing requirement is met, the working efficiency is improved, and the triangular valve plate 9 is provided with the triangular valve plate torsion spring 14, and the triangular valve plate 9 is automatically closed when the mining is stopped.
Example 2:
the method for using the subsurface safety valve according to any one of the following:
during normal operation, the triangular valve plate 9 and the main valve plate 19 are in an open state, and meanwhile, the main valve plate 19 is separated from fluid through the central pipe 8, so that the erosion of the fluid to the main valve plate 19 is slowed down;
when the working is stopped, the central tube 8 compresses the spring 6 through the spring upper ring 4 under the action of oil, and moves downwards along the guide groove 23 of the piston 12, the oil enters the ring cavity 24 through the overflow hole 22, so that the downward movement of the central tube 8 is further ensured, meanwhile, the main valve plate 19 moves downwards slowly under the action of the main valve plate torsion spring 20 along with the downward movement of the central tube 8, and finally is attached to the upper part of the main valve plate fixing sleeve 17, so that the oil on the upper part of the safety valve is blocked; as the upper layer oil is closed, the triangular valve plate 9 starts to move downwards under the action of the triangular valve plate torsion spring 14 and overcomes the acting force of the oil, the central tube 8 continues to move downwards under the action of the annular cavity oil and self gravity, after the triangular valve plate 9 closes the channel, the central tube 8 moves to the bottommost part, and the triangular valve plate 9 is clamped by the groove 27 at the bottom of the central tube, so that the triangular valve plate 9 is kept in a closed state, and blowout is prevented;
when the operation is restarted, as the oil liquid at the upper part of the main valve plate 19 is extracted, the central pipe 8 jacks up the main valve plate 19 to move upwards under the action of the spring 6, meanwhile, the restriction of the triangular valve plate 9 is released, the oil liquid slowly opens under the action of the oil liquid and the internal and external pressure difference, the oil liquid enters the central pipe 8, the central pipe 8 continues to move upwards under the action of the oil liquid and the spring, the triangular valve plate 9 is completely opened, and meanwhile, the main valve plate 19 is also completely opened along with the upward movement of the central pipe, and the fluid channel is restored to a normal smooth state.
The above-described embodiments are intended to illustrate the present invention, not to limit it, and any modifications and variations made thereto are within the spirit of the invention and the scope of the appended claims.
Claims (8)
1. The utility model provides a safety valve in pit, includes top connection (1), intermediate head (5), spring (6), center tube (8), triangle valve plate (9), lower clutch (11), piston (12) and main valve plate (19), its characterized in that: the upper joint (1) is connected with the middle joint (5), and the other end of the middle joint (5) is connected with the lower joint (11); a central tube (8) is arranged in a safety valve cavity formed by the upper joint (1), the middle joint (5) and the lower joint (11); the main valve plate fixing sleeve (17) is sleeved on the central tube (8) in an sleeved mode and embedded at the upper portion of the middle joint (5); the outside of the central tube (8) is embedded with the inner part of the middle joint (5) in a sleeved mode, and a spring upper ring (4) is sleeved on the inner part of the middle joint; the spring (6) is sleeved outside the central tube (8), and the top end of the spring is in contact limit with the spring upper ring (4); the lower part of the central tube (8) is internally sleeved with a lower clamping ring (16) at the position embedded in the lower joint (11), the inner bottom of the lower joint (11) is embedded with a triangular valve plate fixing sleeve (10), the bottom of the piston (12) is matched with the triangular valve plate fixing sleeve (10), the main valve plate (19) is arranged on a main valve plate fixing sleeve (17), and the triangular valve plate (9) is connected with the piston (12);
the upper joint (1) and the middle joint (5) and the lower joint (11) are respectively connected by threads; the triangular valve plate fixing sleeve (10) and the inner cavity of the lower joint (11) form sliding fit connection;
the central tube (8) comprises a first central tube (25) and a second central tube (26) which are connected in a butt joint mode, a groove for installing an O-shaped ring is formed in the top of the central tube (8), a central tube boss (3) for limiting the position of an upper spring ring (4) is arranged on the first central tube (25), a guide groove (23) is formed in the lower portion of the second central tube (26), and an overflow hole (22) is formed in the lower portion of the second central tube (26).
2. A subsurface safety valve according to claim 1, wherein: the main valve plate fixing sleeve (17) is connected with the middle joint (5) through threads, a shoulder for installing a main valve plate is arranged on the main valve plate fixing sleeve (17), a rectangular groove (28) is formed in the shoulder, and the main valve plate (19) is installed in the rectangular groove (28) through a main valve plate pin (18); the main valve plate fixing sleeve (17) is internally provided with a main valve plate fixing sleeve O-shaped ring groove (30), and the main valve plate fixing sleeve O-shaped ring (2) is arranged in the main valve plate fixing sleeve O-shaped ring groove (30).
3. A subsurface safety valve according to claim 2, wherein: the outer diameter of the main valve plate (19) is larger than the inner diameter of the main valve plate fixing sleeve (17) and smaller than the outer diameter of the main valve plate fixing sleeve (17), and the main valve plate (19) cannot be completely opened due to overlarge outer diameter when being opened; the inner diameter of the main valve plate (19) is smaller than the inner diameter of the main valve plate fixing sleeve (17), and a main valve plate torsion spring (20) is arranged on the main valve plate (19).
4. A subsurface safety valve according to claim 3 wherein: the lower clamping ring (16) is arranged at the upper part of the lower joint (11) through threaded connection, and an installation groove for installing the lower clamping ring O-shaped ring (7) is processed on the inner wall of the upper part of the lower clamping ring (16); the bottom end of the spring (6) is in contact fit with the upper end face of the lower clamping ring (16).
5. A subsurface safety valve according to claim 4, wherein: the novel valve is characterized in that the piston (12) is connected with the inner cavity of the triangular valve plate fixing sleeve (10) through threads, a guide boss (21) matched with a guide groove (23) of the central tube (8) is machined on the piston (12), a plurality of groups of uniformly distributed piston shoulders (29) used for mounting pins are arranged in the cavity of the piston (12), and through holes for mounting the pins are machined in the piston shoulders (29).
6. A subsurface safety valve according to claim 5, wherein: an annular cavity (24) is formed between the inner wall of the piston (12) and the lower outer wall of the central tube (8), the annular cavity (24) is positioned below the lower clamping ring (16), a central tube bottom groove (27) is formed in the bottom of the central tube (8), the central tube bottom groove (27) is matched with a piston shoulder (29) on the piston (12), and when the triangular valve plate (9) is closed, the triangular valve plate (9) can be effectively clamped to prevent blowout; the outer part of the upper part of the piston (12) is provided with a piston O-shaped ring (15) which is used for being matched with the lower joint (11).
7. A subsurface safety valve according to claim 6, wherein: the triangular valve plate (9) is connected with the piston (12) through a triangular valve plate pin (13), the triangular valve plate (9) is of a fan-shaped structure, and the triangular valve plate (9) is provided with a triangular valve plate torsion spring (14) and enables the triangular valve plate (9) to be automatically closed when mining is stopped.
8. The method of using a subsurface safety valve according to claim 7, wherein:
during normal operation, the triangular valve plate (9) and the main valve plate (19) are in an open state, and meanwhile, the main valve plate (19) is separated from the fluid through the central pipe (8) to slow down the erosion of the fluid to the main valve plate (19);
when the working is stopped, the central tube (8) compresses the spring (6) through the spring upper ring (4) under the action of oil, and moves downwards along the guide groove (23) of the piston (12), the oil enters the ring cavity (24) through the overflow hole (22), the downward movement of the central tube (8) is further ensured, meanwhile, the main valve plate (19) moves downwards under the action of the main valve plate torsion spring (20) along with the downward movement of the central tube (8), and finally is attached to the upper part of the main valve plate fixing sleeve (17) to isolate the oil on the upper part of the safety valve; as the upper layer oil is closed, the triangular valve plate (9) starts to move downwards under the action of the triangular valve plate torsion spring (14) against the acting force of the oil, the central tube (8) continues to move downwards under the action of the annular cavity oil and self gravity, after the triangular valve plate (9) closes a channel, the central tube (8) moves to the bottommost part, and a groove (27) at the bottom of the central tube clamps the triangular valve plate (9), so that the triangular valve plate (9) is kept in a closed state, and blowout is prevented;
when restarting work, along with main valve plate (19) upper portion fluid is extracted, center tube (8) jack-up main valve plate (19) upward movement under spring (6) effect, simultaneously, triangle valve plate (9) restriction is released, open under the inside and outside pressure differential of fluid effect, fluid gets into center tube (8), center tube (8) continue upward movement under fluid and spring's effect, triangle valve plate (9) are opened completely, main valve plate (19) are opened completely along with the upward movement of center tube simultaneously also, fluid passage resumes normal unblocked state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139876.7A CN109695435B (en) | 2019-02-26 | 2019-02-26 | Underground safety valve and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139876.7A CN109695435B (en) | 2019-02-26 | 2019-02-26 | Underground safety valve and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109695435A CN109695435A (en) | 2019-04-30 |
| CN109695435B true CN109695435B (en) | 2023-08-22 |
Family
ID=66233561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910139876.7A Active CN109695435B (en) | 2019-02-26 | 2019-02-26 | Underground safety valve and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109695435B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470465A (en) * | 1983-04-22 | 1984-09-11 | Halliburton Company | Ball type shut in tool |
| CN201074502Y (en) * | 2007-08-27 | 2008-06-18 | 中国石油天然气集团公司 | Dual-valve plate type subsurface safety valve |
| CN103821477A (en) * | 2014-03-17 | 2014-05-28 | 中国石油大学(华东) | Self-balancing downhole safety valve |
| CN205823234U (en) * | 2016-07-08 | 2016-12-21 | 北京博德世达石油技术股份有限公司 | A kind of relief valve |
| CN108505970A (en) * | 2012-03-07 | 2018-09-07 | 哈里伯顿制造服务有限公司 | Underground equipment and flow control method |
| CN209523733U (en) * | 2019-02-26 | 2019-10-22 | 长江大学 | A kind of storm valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6568470B2 (en) * | 2001-07-27 | 2003-05-27 | Baker Hughes Incorporated | Downhole actuation system utilizing electroactive fluids |
| US8256522B2 (en) * | 2010-04-15 | 2012-09-04 | Halliburton Energy Services, Inc. | Sand control screen assembly having remotely disabled reverse flow control capability |
-
2019
- 2019-02-26 CN CN201910139876.7A patent/CN109695435B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470465A (en) * | 1983-04-22 | 1984-09-11 | Halliburton Company | Ball type shut in tool |
| CN201074502Y (en) * | 2007-08-27 | 2008-06-18 | 中国石油天然气集团公司 | Dual-valve plate type subsurface safety valve |
| CN108505970A (en) * | 2012-03-07 | 2018-09-07 | 哈里伯顿制造服务有限公司 | Underground equipment and flow control method |
| CN103821477A (en) * | 2014-03-17 | 2014-05-28 | 中国石油大学(华东) | Self-balancing downhole safety valve |
| CN205823234U (en) * | 2016-07-08 | 2016-12-21 | 北京博德世达石油技术股份有限公司 | A kind of relief valve |
| CN209523733U (en) * | 2019-02-26 | 2019-10-22 | 长江大学 | A kind of storm valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109695435A (en) | 2019-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102817575A (en) | Downhole blow-out preventer with automatic controlling and anchoring function | |
| CN104499993B (en) | Dual-flap-valve type downhole safety valve | |
| CN109441399A (en) | One kind can sand washing bridge plug | |
| CN116335579A (en) | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method | |
| CN113882820B (en) | Blowout prevention valve in drilling tool | |
| CN116927675A (en) | Blowout prevention connector with pressure release mechanism for oil pump | |
| CN206693964U (en) | Drilling tool float valve open in usual | |
| CN106401528A (en) | Grouting method for drilling rod | |
| CN111502573B (en) | Nozzle type check valve | |
| CN109695435B (en) | Underground safety valve and use method thereof | |
| CN219061594U (en) | Underground air release valve | |
| CN209179726U (en) | One kind can sand washing bridge plug | |
| CN209523733U (en) | A kind of storm valve | |
| CN106351602A (en) | Expanding type differential pressure opening type fine leakage finding and leakage checking packer | |
| RU128896U1 (en) | DEVICE FOR TRANSFER OF WELLS, INCLUDING WATERFILLED, TO OPERATION ON TWO LIFT COLUMNS | |
| CN111706313B (en) | Pressure relief protector for deep water oil gas test retention valve | |
| CN218376413U (en) | Radial valve system of packer valve joint | |
| CN211874442U (en) | Lifting, pressurizing and unsetting expansion type packer | |
| CN113090224B (en) | Guide shoe for well cementation and expansion suspension well cementation tubular column | |
| CN114109307A (en) | Erosion-resistant normally-open type internal blowout prevention valve | |
| CN210033384U (en) | Underground anti-blocking oil extraction device | |
| CN201080808Y (en) | Lifting and hanging type oil drainage device | |
| CN111691852A (en) | Oil drainage mechanism and blowout-prevention oil drainage double-acting device | |
| RU2405998C1 (en) | Universal valve | |
| CN205714077U (en) | Oil well pump blanking plug |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |