CN111779464B - Double-layer pipe double-gradient pressure control drilling underground blowout preventer - Google Patents
Double-layer pipe double-gradient pressure control drilling underground blowout preventer Download PDFInfo
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- CN111779464B CN111779464B CN202010896553.5A CN202010896553A CN111779464B CN 111779464 B CN111779464 B CN 111779464B CN 202010896553 A CN202010896553 A CN 202010896553A CN 111779464 B CN111779464 B CN 111779464B
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- 238000005553 drilling Methods 0.000 title claims abstract description 38
- 238000007789 sealing Methods 0.000 claims description 23
- 239000010410 layer Substances 0.000 description 64
- 239000012530 fluid Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
- E21B33/1216—Anti-extrusion means, e.g. means to prevent cold flow of rubber packing
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention relates to a double-pipe double-gradient pressure control drilling underground blowout preventer, which mainly comprises an upper joint and a lower joint of an inner pipe, an upper valve seat and a lower valve seat of the blowout preventer, a coaxial throttling sliding sleeve arranged between the upper valve seat and the lower valve seat, a double-pipe inner pipe plugging structure arranged on the lower valve seat, and a double-pipe centralizing structure arranged on the upper valve seat and the lower valve seat. The double-layer pipe inner pipe plugging structure mainly comprises a cone valve clack, a cone valve mounting block and a pin. The double-layer pipe righting structure mainly comprises a righting block provided with a flow passage. The blowout preventer has the advantages that the blowout preventer can be automatically closed when well kick and blowout occur at the bottom of the well; the annular channel of the inner pipe and the outer pipe of the double-layer pipe is plugged at the same time, so that the safety of double-gradient pressure-controlled drilling of the double-layer pipe is ensured; after the well killing is finished and the well kick and blowout are controlled, the blowout preventer can be automatically started again to ensure the normal operation of drilling.
Description
Technical Field
The invention relates to the technical field of double-layer pipe double-gradient pressure-control drilling, in particular to an underground blowout preventer of a double-layer pipe double-gradient pressure-control drilling.
Background
After years of exploration and development, the exploitation state of land oil resources is close to saturation, and the search for new oil and gas resources to the ocean is a new hot direction for world oil and gas development. The abundant oil gas and natural gas hydrate resources stored in south China sea are mostly stored in deep sea areas, and the double-layer pipe double-gradient pressure-controlled drilling technology is a feasible technology in the face of the difficult problems of narrow pressure window, easy-to-leak production layer, safe drilling of loose seabed surface layer, low leakage pressure of seabed shallow hydrate layer and the like in deep drilling operation.
In the double-layer pipe double-gradient pressure control drilling operation, dangerous working conditions such as well invasion, overflow and even blowout easily occur when shallow gas and reservoir layers are drilled, and if the dangerous working conditions cannot be controlled in time, serious casualties, economic loss and environmental pollution can be caused. In order to effectively avoid the occurrence of the above conditions, an underground blowout preventer needs to be designed aiming at the structure of the double-layer pipe, so that the quick response and control on dangerous working conditions such as blowout and the like are realized, and the safe operation of the double-layer pipe dual-gradient pressure control drilling is ensured.
The existing blowout preventer aiming at the double-layer pipe structure has the following problems:
(1) the blowout preventer comprises a set of detached blowout prevention valves, and is used for plugging double-layer pipe annulus channels and double-layer pipe inner pipe channels respectively, and the blowout preventer needs to be manually opened, and when dangerous working conditions occur, the double-layer pipe annulus channels and the double-layer pipe inner pipe channels cannot be plugged simultaneously.
(2) The existing blowout preventer aiming at the double-layer pipe utilizes the pressure difference between the blowout and the normal drilling as the driving force, and a partition plate with a larger stress surface is required to be arranged at an inner pipe passage, so that the inner pipe passage is reduced, and the migration of rock debris in an inner pipe is seriously influenced.
(3) The traditional plugging structure is such as an arrow valve, and a cone valve is eroded by circulating media for a long time in the normal drilling process, so that the service life and the reliability of the cone valve are seriously reduced.
(4) The traditional shaft bottom blowout preventer cannot be automatically opened after being closed, and parts need to be recycled and replaced, so that the use is not convenient enough.
Disclosure of Invention
In order to solve the problems, the invention provides a double-layer pipe dual-gradient pressure control drilling underground blowout preventer, which adopts a necking throttling principle to design a coaxial throttling sliding sleeve, and simultaneously, a double-layer pipe inner and outer pipe annular passage plugging structure is arranged on the coaxial throttling sliding sleeve; the lower end of the coaxial throttling sliding sleeve covers the valve clack of the inner pipe cone valve in the normal drilling process, so that the problem that the service life and reliability of an inner pipe plugging structure of a conventional blowout prevention valve are reduced due to long-term erosion in the normal drilling process is solved; meanwhile, the coaxial throttling sliding sleeve designed according to the necking throttling principle can reserve a large enough path in the inner pipe for transporting rock debris, and can solve the problem that the rock debris in the traditional double-layer pipe blowout preventer is difficult to transport; after the pressure at the bottom of the well is reduced by killing the well and the like, the coaxial throttling sliding sleeve pushes open the valve clack of the cone valve under the action of a return spring arranged in the blowout preventer, and the underground blowout preventer is opened again, so that the drilling can be continued. The problem that parts need to be manually opened or replaced after the traditional underground blowout preventer is closed is solved, and the aim of repeated use is achieved.
The following technical scheme is adopted to solve the technical problems of the invention: a double-layer pipe double-gradient pressure control drilling underground blowout preventer is composed of an inner pipe upper joint; the upper valve seat is connected with an upper connector of the inner pipe through threads, and a centralizing block I provided with an overflowing hole is arranged between the upper connector and the upper valve seat and is positioned through a shaft shoulder; the coaxial throttling sliding sleeve realizes circumferential positioning through an upper valve seat and a lower valve seat, an outer layer sliding sleeve and an inner layer sliding sleeve are arranged on the coaxial throttling sliding sleeve, the inner layer sliding sleeve is in clearance fit with the inner wall of the double-layer pipe, the outer layer sliding sleeve is in clearance fit with the outer wall of the double-layer pipe, and a step-shaped conical surface sealing structure is arranged on the coaxial throttling sliding sleeve; a return spring is arranged between the upper valve seat and the coaxial throttling sliding sleeve; the cone valve mounting block and the convex cone valve clack are connected together through a pin I, the cone valve mounting block and the concave cone valve clack are connected together through a pin II, and both the convex cone valve clack and the concave cone valve clack can rotate on the pin within a certain angle; the cone valve mounting block is mounted on the lower valve seat through a screw; the lower joint of the inner pipe is connected with the lower valve seat through threads; the centralizing block II provided with an overflowing hole is arranged between the lower valve seat and the lower joint and is positioned through a shaft shoulder; and finally, the outer pipe lower joint and the outer pipe upper joint are connected through threads to form an outer shell of the underground blowout preventer.
The upper connector of the inner pipe is provided with a tapered male buckle and an internal thread connected with the upper valve seat.
The inner tube lower joint is provided with a tapered female buckle and an internal thread connected with the lower valve seat.
And the righting block I is provided with an overflowing hole.
And the righting block II is provided with an overflowing hole.
The stepped conical surface sealing structure is composed of two bosses with a small upper part and a large lower part, the thickness of the small boss is larger than that of the outer-layer sliding sleeve, and the sealing end surface is a conical surface on the two bosses.
The coaxial throttling sliding sleeve is provided with an inner sliding sleeve, an outer sliding sleeve, an O-shaped sealing ring groove I positioned on the upper portion of the outer sliding sleeve, an O-shaped sealing ring groove II positioned on the lower portion of the outer sliding sleeve, an O-shaped sealing ring groove III positioned on the upper portion of the coaxial throttling sliding sleeve, an O-shaped sealing ring groove IV positioned on the upper portion of the inner sliding sleeve, and a partition plate with four arc-shaped liquid discharge holes and positioned between the inner sliding sleeve and the outer sliding sleeve.
The cone valve clacks are four in number, wherein two concave cone valve clacks are symmetrically arranged, and two convex cone valve clacks are symmetrically arranged.
The lower valve seat is provided with an inner pipe wall boss II, a positioning shaft shoulder II and an external thread connected with the lower joint of the inner pipe. Four through holes are uniformly distributed, and the cone valve mounting block is mounted on the inner wall of the lower valve seat through screws.
The cone valve mounting block is provided with a pin hole and a threaded hole.
The outer tube upper joint is provided with a positioning shaft shoulder IV, an external thread connected with the outer tube lower joint, and a boss which is big at top and small at bottom and is matched with the stepped conical surface sealing structure.
The outer tube lower joint is provided with a positioning shaft shoulder III and an internal thread connected with the outer tube upper joint.
The invention has the beneficial effects that: (1) the double-layer pipe inner pipe channel and the double-layer pipe annular channel can be simultaneously plugged when dangerous working conditions such as blowout and the like occur at the bottom of a well so as to ensure the safety of the drilling platform. (2) The coaxial throttling slip sleeve is designed according to the necking throttling principle, and a larger drift diameter is reserved in the inner pipe for transporting rock debris. (3) The double-layer pipe underground blowout preventer designed by the invention has the advantages that the coaxial throttling sliding sleeve covers the double-layer pipe inner pipe plugging structure in the normal drilling process, so that the erosion degree of the cone valve clack in the inner pipe plugging structure is greatly reduced, and the service life of the cone valve clack can be prolonged. (4) The double-pipe underground blowout preventer is provided with the return spring, and after the blowout preventer is closed due to blowout and other reasons, when well killing is completed, the bottom pressure of the well is reduced, and the blowout preventer is opened under the action of the return spring for continuous use. (5) The invention is provided with the double-layer external pipe standard joint and the internal pipe plug-in type connecting structure, is convenient to use and can be directly connected into a drill rod.
Drawings
FIG. 1 is a schematic view of an open condition of a blowout preventer and a closed condition of the blowout preventer according to the present invention;
FIG. 2 is a quarter sectional three-dimensional schematic view of the fitting on the inner pipe of the present invention;
FIG. 3 is a quarter sectional three-dimensional schematic view of the lower joint of the inner pipe of the present invention;
FIG. 4 is a quarter cross-sectional three-dimensional schematic view of an upper valve seat of the present invention;
FIG. 5 is a quarter cross-sectional three-dimensional schematic view of a lower valve seat of the present invention;
FIG. 6 is a schematic view of a cone valve mounting block of the present invention;
FIG. 7 is a schematic view of the assembly of the cone valve flap and the cone valve mounting block of the present invention:
FIG. 8 is a three-dimensional comparison of the opening and closing states of the cone valve flap according to the present invention;
FIG. 9 is a quarter sectional view of the coaxial throttling sliding sleeve of the present invention;
FIG. 10 is a schematic view of a centralizer block of the present invention;
FIG. 11 is a quarter sectional view of the upper fitting of the outer tube of the present invention;
FIG. 12 is a quarter sectional view of the lower joint of the outer tube of the present invention;
FIG. 13 is a three-dimensional schematic view of two cone valve flaps of the present invention.
In the figure, 1-inner pipe upper joint, 101-inner thread, 2-upper valve seat, 201-outer thread, 202-positioning shaft shoulder I, 203-limiting shaft shoulder, 204-inner pipe wall boss I, 3-centralizing block I, 301-overflowing hole, 4-coaxial throttle sliding sleeve, 401-inner layer sliding sleeve, 402-outer layer sliding sleeve, 403-step type conical surface sealing structure, 404-O type sealing ring groove I, 405-O type sealing ring groove II, 406-O type sealing ring groove III, 407-O type sealing ring groove IV, 408-division plate, 409-arc liquid discharge hole, 5-reset spring, 6-cone valve mounting block, 601-pin hole I, 602-threaded hole, 7-pin I, 8-concave cone valve clack, 801-pin hole II, 9-convex cone valve clack, 901-pin hole III, 10-lower valve seat, 1001-through hole, 1002-inner pipe wall boss II, 1003-positioning shaft shoulder II, 1004-external thread, 11-inner pipe lower joint, 1101-internal thread, 12-centralizing block II, 1201-overflowing hole, 13-outer pipe lower joint, 1301-positioning shaft shoulder III, 1302-internal thread, 14-outer pipe upper joint, 1401-positioning shaft shoulder IV, 1402-boss and 1403-external thread.
Detailed Description
The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following description:
as shown in 1, the double-pipe double-gradient pressure control drilling underground blowout preventer comprises an inner pipe upper joint 1, an upper valve seat 2, a centering block I3, a coaxial throttling sliding sleeve 4, a return spring 5, a cone valve mounting block 6, a pin I7, a concave cone valve clack 8, a convex cone valve clack 9, a lower valve seat 10, an inner pipe lower joint 11, a centering block II 12, an outer pipe lower joint 13 and an outer pipe upper joint 14; the inner pipe upper joint 1 is connected with the upper valve seat 2 through threads; the centralizing block I3 provided with an overflowing hole is positioned by a shaft shoulder and is arranged between the upper joint and the upper valve seat; the coaxial throttling sliding sleeve 4 is arranged between the upper valve seat and the lower valve seat, an inner layer sliding sleeve 401 on the coaxial throttling sliding sleeve 4 is in clearance fit with the inner wall of the double-layer pipe, and an outer layer sliding sleeve 402 on the coaxial throttling sliding sleeve 4 is in clearance fit with the outer wall of the double-layer pipe; the return spring 5 is arranged between the upper valve seat 2 and the coaxial throttling sliding sleeve 4 and is provided with a certain pretightening force; the cone valve mounting block 6 is connected with the concave cone valve clack 8 through a pin I7; the cone valve mounting block 6 is connected with the convex cone valve clack 9 through a pin II; the cone valve mounting block 6 is connected with a lower valve seat 10 through screws, the lower valve seat 10 is connected with an inner pipe lower joint 11 through threads, a centralizing block II 12 provided with an overflowing hole is positioned through a shaft shoulder and mounted between the lower valve seat 10 and the inner pipe lower joint 11, and finally an outer pipe lower joint 13 and an outer pipe upper joint 14 are connected through threads to form an outer shell of the underground blowout preventer.
The working process of the invention is as follows:
in the normal drilling process, the underground blowout preventer is in an open state, drilling fluid is pumped in from a double-layer pipe annulus, the drilling fluid flows into the double-layer drill pipe annulus connected to the upper part of the underground blowout preventer through an annular channel formed by the outer-layer sliding sleeve 401 and the inner wall of the outer pipe upper joint 14 and flows into the double-layer drill pipe annulus connected to the lower part of the underground blowout preventer to the bottom of the well, the drilling fluid returns from the inner pipe channel along with rock debris after passing through a bottom drill bit, and when the drilling fluid along with the rock debris passes through the inner-layer sliding sleeve 401 of the underground blowout preventer, the pressure of the large diameter end of the reducing section is greater than that of the small diameter end due to the gradual reduction of the flow passage in the reducing section, thereby forming pressure drop, the variable-diameter section generates upward thrust, the coaxial throttling sliding sleeve 4 cannot be pushed due to the existence of the pretightening force of the spring, the downhole blowout preventer remains open, and drilling fluid carries cuttings back to the surface mud system from the inner pipe passage.
When dangerous working conditions such as blowout are met in the drilling process, a large amount of bottom-hole fluid rapidly passes through the double-layer pipe annular channel, the double-layer pipe inner pipe channel upwards gushes out, a large amount of bottom-hole fluid returns to the inner-layer sliding sleeve 401 of the underground blowout preventer from the inner pipe, the pressure of the large-diameter end of the reducing section of the inner-layer sliding sleeve 401 is larger than that of the small-diameter end, pressure drop is formed, upward thrust is generated at the reducing section, the generated thrust overcomes the pre-tightening force of the reset spring 5, the coaxial throttling sliding sleeve 4 is pushed to upwards move along the axis of the coaxial throttling sliding sleeve until the inner-layer sliding sleeve 401 moves to the limiting shaft shoulder 203, the stepped end face sealing structure 403 on the coaxial throttling sliding sleeve is matched with the boss 1402 on the outer pipe upper connector 14 to form two conical face seals, and the. And simultaneously, the small-diameter end of the lower part of the inner-layer sliding sleeve 401 covering the concave cone valve clack 8 and the convex cone valve clack 9 moves upwards simultaneously, the convex cone valve clack 9 arranged on the cone valve mounting block 6 starts to be closed under the action of the shaft bottom fluid, the concave cone valve clack 8 starts to be closed under the action of the shaft bottom fluid and the convex cone valve clack 9 simultaneously, when the four cone valve clacks are completely closed, the inner pipe channel of the double-layer pipe is blocked, the shaft bottom fluid can not upwards gush out through the inner pipe channel of the double-layer pipe, and the double-layer pipe underground blowout preventer is switched from an open state to a closed state. When the well killing work is finished, the bottom hole pressure is reduced, the coaxial throttling sliding sleeve jacks the concave cone valve clack 8 and the convex cone valve clack 9 under the action of the reset spring 5, the double-layer pipe underground blowout prevention valve is automatically opened again, and the drilling continuation is ensured.
According to the double-layer-pipe double-gradient pressure-control drilling underground blowout preventer, when blowout occurs at the bottom of a well, a large amount of fluid returning upwards from the bottom of the well flows through the inner-layer sliding sleeve of the blowout preventer, upward thrust is generated under the throttling action, the thrust overcomes the pre-tightening force of the reset spring, the coaxial throttling sliding sleeve is pushed to move axially until the coaxial throttling sliding sleeve is matched with the stepped conical surface sealing structure on the outer-layer sliding sleeve and the boss arranged on the upper connector of the outer pipe to complete the plugging of the inner-outer-pipe annular channel of the double-layer pipe, and meanwhile, the small-diameter end of the lower part of the inner-layer sliding sleeve covering the valve clack of the cone valve moves upwards along the axis, and the valve. So far the shaft bottom fluid can not gush out upwards through two channels of double-layer pipe, double-layer pipe blowout preventer under well is accomplished by the state conversion of opening to closing, double-layer pipe inside and outside pipe annulus is empty, double-layer pipe inner tube passageway is by the complete shutoff, after killing the well under the effect of reset spring, double-layer pipe blowout preventer under well is automatic to open and continue to use. The invention can completely block the inner pipe channel and the outer pipe annulus of the double-layer pipe and the inner pipe channel of the double-layer pipe at the same time when dangerous working conditions such as blowout and the like occur at the well bottom, and can effectively prevent the occurrence of drilling accidents caused by blowout.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The inner layer structure of the underground blowout preventer comprises an inner pipe upper joint (1), an upper valve seat (2) connected with the inner pipe upper joint (1) through threads, a centralizing block I (3) which is arranged between the inner pipe upper joint (1) and the upper valve seat (2) and positioned through a shaft shoulder and provided with an overflowing hole (301), and a coaxial throttling sliding sleeve (4) arranged between the upper valve seat (2) and a lower valve seat (10), wherein the coaxial throttling sliding sleeve (4) is provided with an inner layer sliding sleeve (401), an outer layer sliding sleeve (402), a stepped conical surface sealing structure (403), an O-shaped sealing ring groove I (404) positioned at the upper part of the outer layer sliding sleeve (402), an O-shaped sealing ring groove II (405) positioned at the lower part of the outer layer sliding sleeve (402), an O-shaped sealing ring groove III (406) positioned at the upper part of the coaxial throttling sliding sleeve (4), and an O-shaped sealing ring groove (407) positioned at the upper part of the inner layer sliding sleeve (401), The stepped conical surface sealing structure (403) is composed of two bosses with a small upper part and a large lower part, the thickness of the small boss is larger than that of the outer sliding sleeve (402), the sealing end surface is a conical surface on the two bosses, the inner sliding sleeve (401) on the coaxial throttling sliding sleeve (4) is in clearance fit with the inner wall of the inner tube of the double-layer tube, the outer sliding sleeve (402) on the coaxial throttling sliding sleeve (4) is in clearance fit with the outer wall of the inner tube of the double-layer tube, the inner structure further comprises a reset spring (5) arranged between the upper valve seat (2) and the coaxial throttling sliding sleeve (4), a cone valve mounting block (6) connected with the lower valve seat (10) through a screw, wherein the cone valve mounting block (6) is connected with the concave cone valve clack (8) through a pin I (7), and the cone valve mounting block (6) is connected with the convex cone valve clack (9) through a pin II, the inner layer structure further comprises an inner pipe lower joint (11) connected with the lower valve seat (10) through threads, a centralizing block II (12) which is arranged between the lower valve seat (10) and the inner pipe lower joint (11) and positioned through a shaft shoulder and provided with an overflowing hole (1201) is arranged on the centralizing block II, the outer layer structure of the underground blowout preventer consists of an outer pipe lower joint (13) and an outer pipe upper joint (14), and the outer pipe lower joint (13) and the outer pipe upper joint (14) are connected through threads to form the outer shell of the underground blowout preventer.
2. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the upper valve seat (2) is provided with an external thread (201) connected with the inner pipe upper joint (1), a positioning shaft shoulder I (202) for positioning the centralizing block I (3), a limiting shaft shoulder (203) of the inner layer sliding sleeve (401), and an inner pipe wall boss I (204).
3. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the concave cone valve is characterized in that the number of the concave cone valve clacks (8) is two, pin holes II (801) are formed in the concave cone valve clacks, and the two concave cone valve clacks are symmetrically installed.
4. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the convex cone valve is characterized in that the number of the convex cone valve clacks (9) is two, pin holes III (901) are formed in the convex cone valve clacks, and the two convex cone valve clacks (9) are symmetrically installed.
5. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the lower valve seat (10) comprises four through holes (1001) which are uniformly distributed, an inner pipe wall boss II (1002), a positioning shaft shoulder II (1003) and an external thread (1004) connected with the inner pipe lower joint (11).
6. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the cone valve mounting block (6) is provided with a pin hole I (601) and a threaded hole (602).
7. The dual-tube dual-gradient pressure-controlled drilling downhole blowout preventer of claim 1, wherein: the outer tube upper joint (14) is provided with a positioning shaft shoulder IV (1401), a boss (1402) which is matched with the stepped conical surface sealing structure (403) and is large in upper part and small in lower part, and an external thread (1403) connected with the outer tube lower joint (13).
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| CN202010896553.5A CN111779464B (en) | 2020-08-31 | 2020-08-31 | Double-layer pipe double-gradient pressure control drilling underground blowout preventer |
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| CN202010896553.5A CN111779464B (en) | 2020-08-31 | 2020-08-31 | Double-layer pipe double-gradient pressure control drilling underground blowout preventer |
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| CN113090219B (en) * | 2021-06-09 | 2021-08-17 | 西南石油大学 | Downhole blowout preventer |
| CN113445962B (en) * | 2021-06-24 | 2022-05-31 | 西南石油大学 | Hydraulic double-layer pipe double-gradient downhole blowout prevention valve |
| CN113863888B (en) * | 2021-10-18 | 2022-06-17 | 西南石油大学 | Underground three-channel integrated blowout preventer for double-tube drilling |
| CN113863866A (en) * | 2021-10-21 | 2021-12-31 | 盐城市荣嘉机械制造有限公司 | Blowout prevention and anti-reflux drill bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201059187Y (en) * | 2006-11-24 | 2008-05-14 | 中国海洋石油总公司 | Pressure-control drilling device based on double gradient |
| US8727040B2 (en) * | 2010-10-29 | 2014-05-20 | Hydril USA Distribution LLC | Drill string valve and method |
| CN205978489U (en) * | 2016-06-29 | 2017-02-22 | 宝鸡石油机械有限责任公司 | Downhole safety is pombe face seal valve plate disk seat for valve |
| WO2018231729A1 (en) * | 2017-06-12 | 2018-12-20 | Ameriforge Group Inc. | Dual gradient drilling system and method |
| CN109763771B (en) * | 2019-01-16 | 2020-11-24 | 西南石油大学 | Dual-gradient drilling system based on continuous oil pipe electric drive |
| CN210239647U (en) * | 2019-04-03 | 2020-04-03 | 江苏新彩阳机电技术有限公司 | Downhole sliding sleeve type blowout prevention switch valve |
| CN110593777B (en) * | 2019-10-08 | 2020-11-06 | 西南石油大学 | Double-gradient drilling string disconnecting and tieback device without marine riser |
| CN111456681B (en) * | 2020-06-08 | 2022-02-22 | 西南石油大学 | Double-layer in-pipe blowout prevention valve |
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