CN117468884A - Blowout prevention tool for well operation pipe column and use method thereof - Google Patents
Blowout prevention tool for well operation pipe column and use method thereof Download PDFInfo
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- CN117468884A CN117468884A CN202210844924.4A CN202210844924A CN117468884A CN 117468884 A CN117468884 A CN 117468884A CN 202210844924 A CN202210844924 A CN 202210844924A CN 117468884 A CN117468884 A CN 117468884A
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- 230000002265 prevention Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004873 anchoring Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 93
- 230000007246 mechanism Effects 0.000 claims description 82
- 241000935974 Paralichthys dentatus Species 0.000 claims description 61
- 238000011010 flushing procedure Methods 0.000 claims description 36
- 210000000078 claw Anatomy 0.000 claims description 22
- 238000005406 washing Methods 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 2
- 241001330002 Bambuseae Species 0.000 claims description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 2
- 239000011425 bamboo Substances 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 abstract description 8
- 206010000369 Accident Diseases 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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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
- E21B33/127—Packers; Plugs with inflatable sleeve
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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
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to an in-well operation pipe column blowout prevention tool and a use method thereof. The tool has a simple structure, and is an in-well safety control tool capable of rapidly and effectively closing an in-well operation pipe column and preventing overflow from surging. When the overflow in the well is found, the tool can be quickly placed in the working string in the well, so that the anchoring of the tool in the working string in the well is realized. The invention can effectively reduce fire accident and environmental pollution accident caused by sudden gushing of oil and gas well, reduce waste and loss of petroleum resource and reduce safety production risk.
Description
Technical Field
The invention relates to a blowout control tool in well control and a using method thereof in the field of oil industry well repairing operation construction, in particular to a blowout control tool for an operation tubular column in a well and a using method thereof.
Background
In recent years, along with the continuous development of economy in China, the demand of China for energy is also increasing, in order to ensure that the petroleum exploitation amount can meet the demand of the economic development in China, offshore oil fields are developed in a large scale year by year, the technical level of exploration and development is improved year by year, and the proportion of oil wells in a middle-deep system is increasing. Because the buried depth of the oil layer is deep, the formation pressure is high, and the well control risk is high in the process of exploiting underground petroleum.
At present, conventional well control tools used in production sites are blowout preventer stacks and internal blowout prevention tools, which are control tools used to block overflows from a working string in a well. The most widely used internal blowout prevention tool is a high-pressure plug valve, the structure of the internal blowout prevention tool is a high-pressure ball valve, and the lower part of the valve body is an external thread of a petroleum pipe. The following problems exist in the use process:
1. when overflow occurs in the well during well workover, the high-pressure plug valve is difficult to rob on the drill floor under the condition of pressure in the well because the high-pressure plug valve needs to be connected with the internal thread of the coupling in the well operation tubular column;
2. even if the high-pressure plug valve is successfully assembled on a drill floor, the high-pressure plug valve is difficult to open under the condition of pressure due to the ball valve structure of the high-pressure plug valve;
3. due to the structural reasons of the high-pressure plug valve, the sealing spherical surface of the valve body is easy to be broken due to the limitation of the inner drift diameter of the high-pressure plug valve in the blowout and well washing and killing processes in the later blowout stage.
Therefore, it is desirable to invent an in-well working string blowout prevention tool that can quickly seal the interior space of an in-well working string, control overflow in the working string, and facilitate subsequent construction.
There are various blowout control tools in the prior art, such as the following, but there are few disclosures of blowout control tools and devices in wells that can meet the above requirements:
the nozzle type check valve disclosed in patent number CN202010545060.7 comprises a shell, a sealing seat, a movable valve body and a protective tube, wherein a plurality of annular slurry channels communicated with the inner cavity of the sealing seat are arranged at the lower part of the sealing seat, and a main seal is arranged at the central part of the lower end of the sealing seat; the movable valve body is movably arranged in a movable cavity formed between the lower end of the sealing seat and the limiting step, the upper end of the movable valve body is provided with an inner conical sealing surface which is in sealing fit with the outer conical sealing surface of the sealing seat, the inner wall of the cavity of the movable valve body is fixedly provided with a nozzle, and the inner cavity of the movable valve body is sealed when the nozzle is in contact with the main seal; a spring is arranged between the lower end of the movable valve body and a spring step of the valve sleeve, and the design principle can eliminate sealing resistance, so that the valve is smoother to open and close.
However, the connection mode of the patent technology and the pipe column is screw thread connection, the rush-installation is difficult, the petroleum pipe buckle is non-airtight, and the risk of puncture leakage exists in long-term use, so that the requirement of blowout prevention in daily well control cannot be met.
The utility model discloses a blowout prevention instrument in oil pipe that can adjust flow size, adopts casing top outer wall to open there is first mounting hole, installs the rotary valve in the first mounting hole, and casing one side inner wall welding is first fixed block, and the first spout is opened to one side outer wall of keeping away from the rotary valve, and first slider is connected in the first spout sliding, and first recess is opened to first slider bottom outer wall, grafting first buffering decompression piece in the first recess. The design is initially designed to prevent blowout at the joint, so that the joint is tightly attached to prevent oil leakage, reduce the pressure in the pipe and regulate the flow.
However, the flow channel of the device is small, well control measures such as well flushing, throttling blowout and the like are difficult to implement in the later period, and therefore the device cannot meet the requirement of internal blowout prevention in daily well control.
The utility model discloses a blowout prevention instrument in suspension type oil pipe of patent number CN201820081469.6, its device comprises last body, lower body, go up valve body, lower valve body, the design principle is that the one side inner wall bottom of going up the body has the one side inner wall top of body to go up the body through threaded connection down through threaded connection, the one side outer wall bottom of going up the valve body passes through threaded connection lower valve body, one side outer wall of lower valve body passes through threaded connection in one side inner wall of body down, the decompression ball is placed to the bottom inner wall of lower valve body for reduce the impact force of liquid and reduce the injury of hydraulic pressure to valve body and oil pipe.
The device is suitable for the working condition of lower pressure in a pipe column, if the working condition of high pressure is encountered, the tool can be disabled by jacking the pressure reducing ball by liquid flow, the flow channel of the device is small, well control measures such as well flushing, throttling blowout and the like are difficult to implement in the later period, and therefore the requirement of blowout prevention in daily well control cannot be met.
Disclosure of Invention
The invention aims to provide an in-well operation pipe column blowout prevention tool and a use method thereof, aiming at the current situation that the in-well operation pipe column blowout prevention tool is lack, so that the in-well operation pipe column blowout prevention tool can quickly seal the inner space of the in-well operation pipe column, control overflow and facilitate subsequent well flushing and killing construction. The sudden overflow of the oil and gas well is reduced, and the fire accident and the environmental pollution accident caused by blowout due to blowout prevention tools in well control are reduced, the waste of petroleum resources and huge loss caused by accidents are reduced, the safety production is ensured, and the economic benefit is improved.
The technical scheme of the invention is as follows:
an in-well operation tubular column blowout prevention tool is provided with a circulation passage opening mechanism, an anchoring mechanism and a sealing mechanism, wherein:
the circulating channel opening mechanism is internally provided with a switch sleeve, a blowout prevention valve and a lower connector, the switch sleeve can open a valve plate arranged in the blowout prevention valve at the lower part of the well washing and killing connector, and the outer diameter of the switch sleeve is larger than the minimum inner diameter of the lower connector;
the anchoring mechanism is provided with an anchor claw and an inner supporting cylinder, the anchor claw is connected with the inner supporting cylinder through a sliding pin nail, and the anchor claw can be propped up by the inner supporting cylinder and anchored in a coupling of an operation pipe column in the well;
the sealing mechanism is provided with a sealing rubber cylinder and a central tube, the sealing rubber cylinder is arranged outside the central tube, and a pressure transmission hole is arranged in the tube wall of the central tube;
the well-flushing joint in the circulating channel opening mechanism can be connected with the well-flushing pipeline joint, and the circulating channel opening mechanism, the anchoring mechanism and the sealing mechanism are sequentially connected with the upper joint of the sealing mechanism through the lower joint, the fluke, the inner supporting cylinder and the upper joint of the sealing mechanism.
Preferably, the blowout prevention valve is further provided with a valve seat, the valve seat is in threaded connection with the lower part of the well washing and killing joint, the switch sleeve is arranged in the upper inner cavity of the valve seat, and the outer diameter of the valve plate is larger than the upper inner cavity of the valve seat and smaller than the lower inner cavity of the valve seat; two rotating shafts are machined on one side of the valve plate and are arranged in a shaft hole machined on one side of the valve seat, spring rings of the torsion springs are respectively arranged outside the two rotating shafts on one side of the valve plate, connecting rods between the two spring rings of the torsion springs are propped against the lower end face of the valve plate, and the valve plate can be freely turned over in the inner cavity of the lower portion of the valve seat.
Preferably, the valve plate is a circular plate with the outer diameter larger than the inner diameter of the switch sleeve, and a pressing groove corresponding to the lower end surface of the switch sleeve is arranged on the upper end surface; the plate body at the top of the valve plate is provided with a chamfer and the outer wall of the plate body below the chamfer is big and small from top to bottom, and a piston mounting hole is arranged in the valve plate body and is provided with a balance piston therein.
Preferably, the body of the balance piston is in an inverted T shape, the outer diameter of the lower part of the body of the balance piston is larger than the outer diameter of the upper part of the body of the balance piston, the balance piston upwards passes through the piston mounting hole from the spring fixed in the piston mounting hole, and the lower part of the body of the balance piston is blocked outside the piston mounting hole; the upper end of the spring is fixed at the top of the piston mounting hole, and the lower end of the spring is fixedly connected with the lower body of the balance piston; the upper end surface of the balance piston after the spring is fixed in the piston mounting hole is 5mm-10mm higher than the upper end surface of the valve plate; the diameter of the outer side of the piston mounting hole formed in the valve plate is smaller than the outer diameter of the switch sleeve and larger than the inner diameter of the pressure groove in the upper end surface of the valve plate.
Preferably, a sealing groove is formed in the inner wall of the well washing and killing connector, sealing grease is filled in the sealing groove, and a grease containing vertical groove is formed in the upper body wall of the switch sleeve; the well washing and killing connector is in clearance fit with the switch sleeve, and the outer surfaces of the switch sleeve, the valve seat and the valve plate are respectively provided with a Teflon coating; the lower part of the well washing and killing connector is connected with the lower connector and is in threaded connection with the fluke through the lower connector, the upper body of the external thread section of the lower connector is conical, the conical body above the external thread section of the lower connector is matched with the elevator, and the outer diameter of the conical body of the lower connector is larger than the inner diameter of the elevator; the outer diameter of the circulation passage opening mechanism is larger than the outer diameters of the anchoring mechanism and the sealing mechanism.
Preferably, the upper part of the fluke is a fluke joint, an inner thread and a limiting table are arranged in an inner cavity of the upper part of the fluke joint, and the inner thread in the inner cavity of the upper part of the fluke joint can be in threaded connection with the lower connector; the fluke joint and the fluke can be integrally manufactured or separately manufactured, and the fluke joint and the fluke are welded when the fluke joint and the fluke are separately manufactured; the upper portion of fluke is equipped with the cotter hole and can packs into the smooth pin, and the lower part of fluke is equipped with three claw piece at least and the lower part outer wall of all claw pieces all is equipped with the thick thread, and the lower part inner wall of fluke cooperatees with the lower part outer wall of interior support section of thick bamboo and the thick thread of lower part outer wall can with the internal thread interlock of well operation tubular column coupling.
Preferably, the outer wall of the inner supporting cylinder is a non-equal diameter outer wall, the outer diameter of the outer wall of the upper part of the inner supporting cylinder is larger than the inner diameter of the limit table in the fluke joint, the outer wall of the middle part of the inner supporting cylinder is provided with a diameter-reducing section serving as a sliding section of the sliding pin, and the outer diameter below the sliding section is larger than the inner diameter of the sliding pin formed in the fluke and the inner diameter of the minimum inner cavity in the free state of the fluke; the lower part of the inner support cylinder is a conical top expansion section and a threaded connection section; the conical top expansion section at the lower part of the inner support cylinder is matched with the claw piece of the fluke, and the threaded connection section can be in threaded connection with the upper joint of the sealing mechanism.
Preferably, the sealing mechanism is also provided with an upper adjusting ring, a lower adjusting ring and a lower joint of the sealing mechanism, and two ends of the central tube are respectively connected with the upper joint of the sealing mechanism and the lower joint of the sealing mechanism through threads; the upper adjusting ring is connected between the upper joint of the sealing mechanism and the upper joint of the sealing rubber barrel, the lower adjusting ring is connected between the lower joint of the sealing rubber barrel and the lower joint of the sealing mechanism, and the lower part of the lower joint of the sealing mechanism is provided with a standby external thread.
Preferably, sealing rings are arranged between the upper joint of the sealing mechanism and the upper adjusting ring and between the lower adjusting ring and the lower joint of the sealing mechanism; the pressure transmission holes are arranged at the upper part of the central pipe and are at least two, and the minimum inner diameter of the blowout prevention tool of the well operation pipe column is set to be more than 40 mm.
The application method of the blowout prevention tool for the operation pipe column in the well comprises the following steps:
A. when overflow is found in the well in the operation construction, immediately lowering the underground operation pipe column, sitting the underground operation pipe column on the wellhead turntable, picking the lifting ring, lifting the travelling block according to the well control requirement, braking and alarming;
B. moving a blowout prevention tool of an operation pipe column in the well to a wellhead turntable, lowering a travelling block according to well control requirements, holding an elevator at a lower connector, and closing the elevator;
C. a travelling block is lowered, and an in-well operation pipe column blowout prevention tool is inserted into the in-well operation pipe column and descends by self weight;
D. after the fluke is contacted with the internal thread of the coupling in the working string in the well, the travelling block is lifted, a throttle valve in the throttle manifold is opened, and the wellhead blowout preventer is closed, so that a well closing procedure is completed;
E. the well-flushing pipeline is connected with the well-flushing joint through the well-flushing pipeline joint, and a valve plate is opened through a switch sleeve in the process of moving down the well-flushing pipeline joint, so that a well-flushing circulation channel is established;
F. pumping a weighted well repairing liquid into the well operation pipe column through the well operation pipe column blowout prevention tool to circularly wash and kill the well;
G. when the pressure of the oil jacket in the well is 0 after the gravity of the liquid column in the well operation pipe column balances the bottom hole pressure, the well cleaning and killing pipeline joint and the well cleaning and killing pipeline are disassembled, the traveling block and the elevator are lifted up, and the well operation pipe column blowout prevention tool is lifted out of the well operation pipe column, so that well cleaning and killing construction is completed.
The invention has the remarkable use effects that:
the tool has a simple structure, and is an in-well safety control tool capable of rapidly and effectively closing an in-well operation pipe column and preventing overflow from surging. When the overflow in the well is found, the tool can be quickly placed in the working string in the well, so that the anchoring of the tool in the working string in the well is realized.
The tool has small volume and light weight, can be conveniently and rapidly inserted into the coupling of the operation pipe column in the well through the elevator under the condition of overflow in the well, and can realize the function of sealing the inner space of the pipe column under the action of the internal pressure of the pipe column. Meanwhile, the opening of the blowout prevention valve in the tool and the opening of the circulating channel can be easily realized, so that the well cleaning and killing and the closing of the circulating channel can be realized, and the tool can be lifted out.
The tool has the advantages that the circulating channel is large, the minimum inner diameter is set to be more than 40mm, and the circulating channel is quick to open and convenient to close. The tool can meet the subsequent well washing and killing function, and the device is made of anti-corrosion materials. The tool is made of corrosion-resistant metal materials, and parts in the tool are subjected to corrosion-resistant treatment, so that the tool can resist flushing of corrosion-resistant well fluid and can be used for a long time.
The tool can effectively reduce fire accidents and environmental pollution accidents caused by the defects of the conventional in-well blowout preventer and sudden gushing of an oil and gas well, reduce the waste and loss of petroleum resources, obviously reduce the safety production risk, and have obvious use effect and application value.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a cross-sectional view of a schematic of the overall structure of the present invention.
Fig. 2 is a cross-sectional view of a schematic view of the circulation passage opening mechanism in fig. 1.
Fig. 3 is a cross-sectional view of a schematic of the anchoring mechanism of fig. 1.
Fig. 4 is a cross-sectional view of a schematic of the seal mechanism of fig. 1.
In the figure: the well-flushing joint 1, the switch sleeve 2, the valve seat 3, the valve plate 4, the balance piston 5, the torsion spring 6, the lower connector 7, the spear claw joint 8, the slide pin 9, the anchor claw 10, the inner supporting cylinder 11, the upper joint 12 of the sealing mechanism, the upper adjusting ring 13, the sealing rubber cylinder 14, the central tube 15, the lower adjusting ring 16 and the lower joint 17 of the sealing mechanism.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1-4, a blowout prevention tool for a working string in a well is provided with a circulation passage opening mechanism, an anchoring mechanism, and a sealing mechanism, wherein:
the circulating channel opening mechanism is internally provided with a switch sleeve 2, a blowout prevention valve and a lower connector 7, the switch sleeve 2 can open a valve plate 4 arranged in the blowout prevention valve at the lower part of the well washing and killing connector 1, and the outer diameter of the switch sleeve 2 is larger than the minimum inner diameter of the lower connector 7;
the anchoring mechanism is provided with an anchor claw 10 and an inner supporting cylinder 11, the anchor claw 10 is connected with the inner supporting cylinder 11 through a sliding pin 9, and the anchor claw 10 can be supported by the inner supporting cylinder 11 and anchored in a coupling of an operation tubular column in a well;
the sealing mechanism is provided with a sealing rubber cylinder 14 and a central tube 15, the sealing rubber cylinder 14 is arranged outside the central tube 15, and a pressure transmission hole is arranged in the tube wall of the central tube 15;
the well-flushing joint 1 in the circulation channel opening mechanism can be connected with a well-flushing pipeline joint, and the circulation channel opening mechanism, the anchoring mechanism and the sealing mechanism are sequentially connected through the lower connector 7, the fluke 10, the inner supporting cylinder 11 and the sealing mechanism upper connector 12.
The invention is provided with a circulating channel opening mechanism, an anchoring mechanism and a sealing mechanism, when overflow is found in the well during drilling or workover, the tool can be hung up by a drilling machine or an elevator in a workover rig and placed in the well. The valve plate 4 of the blowout prevention valve is in a closed state in the initial state of the circulating channel opening mechanism in the tool, so that overflow in a well can be prevented from being gushed.
When the overflow in the well is found, the tool is hoisted by a drilling machine or an elevator in a workover rig and put into the well, and the anchor fluke 10 and the inner supporting cylinder 11 generate relative displacement in the process that the travelling block drives the elevator to put down the tool, the anchor fluke 10 is propped up by the inner supporting cylinder 11 and anchored in the coupling of the working string in the well. The tool is capable of reliable anchoring with a collar in a work string in a well by means of fluke 10.
After the overflow in the well is prevented from ascending by the blowout prevention valve, the overflow in the well can only enter an annular space between the central pipe 15 and the sealing rubber cylinder 14 through a pressure transmission hole in the central pipe 15 of the tool, the sealing rubber cylinder 14 is expanded, the sealing between the tool and a shaft is realized, the overflow in the well is thoroughly blocked, and the well control safety is ensured.
After overflow in the well is blocked, the well washing joint 1 at the upper part of the tool can be connected with a well washing pipeline through the well washing pipeline joint. Because the external diameter of the switch sleeve 2 is larger than the minimum internal diameter in the lower connector 7, the descending limitation of the switch sleeve 2 is realized, the well-flushing pipeline connector is pressed down to open the switch sleeve 2 in the connection process with the well-flushing connector 1, the valve plate 4 in the blowout prevention valve is opened, the opening of a circulation channel is realized, and well-flushing operation can be performed.
After the well-flushing operation is completed, the pressure of the oil jacket in the well is 0, the well-flushing pipeline and the well-flushing pipeline connector can be disassembled, and after the well-flushing pipeline connector is disassembled, the switch jacket 2 and the valve plate 4 automatically move back to the original state. In the process that the traveling block drives the elevator to lift the tool, the fluke 10 is separated from the inner supporting cylinder 11, so that the locking state of the tool is released, and the tool can be conveniently lifted out of the well.
The tool has a simple structure, and is an in-well safety control tool capable of rapidly and effectively closing an in-well operation pipe column and preventing overflow from surging. When the overflow in the well is found, the tool can be quickly placed in the working string in the well, so that the anchoring of the tool in the working string in the well is realized. The circulating channel is large, and the circulating channel is quick to open and convenient to close. The device can effectively reduce fire accidents and environmental pollution accidents caused by sudden gushing of the oil and gas well due to the defects of the conventional in-well blowout preventer, reduces the waste and loss of petroleum resources, eliminates the risk of safety production, and has remarkable use effect and application value.
On the basis of the first embodiment, the present invention also has the following embodiments:
one preferred embodiment is: the blowout prevention valve is further provided with a valve seat 3, the valve seat 3 is in threaded connection with the lower part of the well washing and killing joint 1, the switch sleeve 2 is arranged in the upper inner cavity of the valve seat 3, and the outer diameter of the valve plate 4 is larger than the upper inner cavity of the valve seat 3 and smaller than the lower inner cavity of the valve seat 3; two rotating shafts are machined on one side of the valve plate 4 and are arranged in a shaft hole machined on one side of the valve seat 3, spring rings of the torsion spring 6 are respectively arranged outside the two rotating shafts on one side of the valve plate 4, connecting rods between the two spring rings of the torsion spring 6 are propped against the lower end face of the valve plate 4, and the valve plate 4 can be freely turned in the inner cavity of the lower portion of the valve seat 3. Under the condition that no external force is pressed down, the valve plate 4 is always in a closed state, when the switch sleeve 2 presses down the valve plate 4, the valve plate 4 can be freely turned down by 90 degrees in the lower inner cavity of the valve seat 3, and when the switch sleeve 2 leaves the valve plate 4, the valve plate 4 is automatically turned up and blocked in the lower inner cavity of the valve seat 3 under the action of the torsion spring 6.
One preferred embodiment is: the valve plate 4 is a circular plate with the outer diameter larger than the inner diameter of the switch sleeve 2, and a pressing groove corresponding to the lower end surface of the switch sleeve 2 is arranged on the upper end surface; the plate body at the top of the valve plate 4 is provided with a chamfer and the upper part and the lower part of the outer wall of the plate body below the chamfer are large and small, and a piston mounting hole is arranged in the plate body of the valve plate 4 and is provided with a balance piston 5. The top of the outer wall of the plate body of the valve plate 4 is provided with a chamfer, and the plate body below the chamfer is a cone, so that dirt can be prevented from remaining between the valve plate 4 and the valve seat 3, and the valve plate 4 can be opened and closed more smoothly.
One preferred embodiment is: the body of the balance piston 5 is in an inverted T shape, the outer diameter of the lower part of the body of the balance piston 5 is larger than the outer diameter of the upper part of the body of the balance piston, the balance piston 5 upwards passes through the piston mounting hole from a spring fixed in the piston mounting hole, and the lower part of the body of the balance piston 5 is blocked outside the piston mounting hole; the upper end of the spring is fixed at the top of the piston mounting hole, and the lower end of the spring is fixedly connected with the lower body of the balance piston 5; the upper end surface of the balance piston 5 after the spring is fixed in the piston mounting hole is 5mm-10mm higher than the upper end surface of the valve plate 4, the balance piston 5 can prevent well fluid from passing through the piston mounting hole in a free state, and when the balance piston 5 is pressed down, the well fluid is allowed to pass through the balance piston; the outside of the piston mounting hole is formed in the valve plate 4 with a diameter smaller than the outer diameter of the switch sleeve 2 and larger than the inner diameter of the pressing groove in the upper end surface of the valve plate 4. When the switch sleeve 2 descends, the lower end face of the switch sleeve can be just pressed on the pressing groove and the balance piston 5, the balance piston 5 can descend, a little liquid can pass through the switch sleeve, the upper pressure and the lower pressure of the valve plate 4 are balanced, and the smooth opening of the valve plate 4 is facilitated.
One preferred embodiment is: the inner wall of the well washing and killing connector 1 is provided with a sealing groove, sealing grease is filled in the sealing groove, and a grease containing vertical groove is arranged in the upper body wall of the switch sleeve 2; the well washing and killing connector 1 is in clearance fit with the switch sleeve 2, and teflon coatings are arranged on the outer surfaces of the switch sleeve 2, the valve seat 3 and the valve plate 4; the lower part of the well-flushing joint 1 is connected with a lower connector 7 and is in threaded connection with an anchor fluke 10 through the lower connector 7, the upper body of an external thread section at the lower part of the lower connector 7 is conical, the conical body above the external thread section at the lower part of the lower connector 7 is matched with an elevator, and the outer diameter of the conical body at the lower part of the lower connector 7 is larger than the inner diameter of the elevator; the outer diameter of the circulation passage opening mechanism is larger than the outer diameters of the anchoring mechanism and the sealing mechanism. The vertical groove of the grease containing in the upper body wall of the switch sleeve 2 can enable the sealing grease in the sealing groove in the well washing and killing joint 1 to enter the switch sleeve 2, so that the sliding between the switch sleeve 2 and the well washing and killing joint 1 is smooth. The teflon coating coated on the outer surfaces of the switch sleeve 2, the valve seat 3 and the valve plate 4 can effectively prevent the corrosion of corrosive media contained in well fluid and effectively prevent the accumulation, precipitation and adhesion of dirt, so that the service life of the tool can be prolonged.
One preferred embodiment is: the upper part of the fluke 10 is a fluke joint 8, an inner thread and a limiting table are arranged in an inner cavity of the upper part of the fluke joint 8, and the inner thread in the inner cavity of the upper part of the fluke joint 8 can be in threaded connection with the lower connector 7; the fluke joint 8 and the fluke 10 can be integrally manufactured or manufactured separately, and the fluke joint 8 and the fluke 10 are welded during the separate manufacturing; the upper portion of the anchor claw 10 is provided with a pin hole and can be filled with a sliding pin 9, the lower portion of the anchor claw 10 is at least provided with three claw pieces, the outer walls of the lower portions of all claw pieces are provided with coarse threads, the inner wall of the lower portion of the anchor claw 10 is matched with the outer wall of the lower portion of the inner supporting cylinder 11, and the coarse threads of the outer wall of the lower portion can be meshed with the inner threads of the coupling of the well operation pipe column. The rough thread on the outer wall of the lower part of the fluke 10 is meshed with the internal thread of the coupling of the working string in the well, so that the anchoring force of the tool in the working string in the well can be effectively improved.
One preferred embodiment is: the outer wall of the inner supporting cylinder 11 is a non-constant diameter outer wall, the outer diameter of the outer wall of the upper part of the inner supporting cylinder 11 is larger than the inner diameter of a limiting table in the fluke joint 8, the outer wall of the middle part of the inner supporting cylinder 11 is provided with a diameter-reducing section which is used as a sliding section of the sliding pin 9, and the outer diameter below the sliding section is larger than the inner diameter of the sliding pin 9 formed in the fluke 10 and the inner diameter of the minimum inner cavity in the free state of the fluke 10; the lower part of the inner support cylinder 11 is a conical top expansion section and a threaded connection section; the conical top expansion section of the lower part of the inner support cylinder 11 is matched with the claw piece of the fluke 10, and the threaded connection section can be in threaded connection with the upper joint 12 of the sealing mechanism.
One preferred embodiment is: an upper adjusting ring 13, a lower adjusting ring 16 and a lower joint 17 of the sealing mechanism are also arranged in the sealing mechanism, and two ends of the central tube 15 are respectively in threaded connection with the upper joint 12 of the sealing mechanism and the lower joint 17 of the sealing mechanism; the upper adjusting ring 13 is connected between the upper joint 12 of the sealing mechanism and the upper joint of the sealing rubber cylinder 14, the lower adjusting ring 16 is connected between the lower joint of the sealing rubber cylinder 14 and the lower joint 17 of the sealing mechanism, and the lower part of the lower joint 17 of the sealing mechanism is provided with standby external threads.
One preferred embodiment is: sealing rings are arranged between the upper joint 12 of the sealing mechanism and the upper adjusting ring 13 and between the lower adjusting ring 16 and the lower joint 17 of the sealing mechanism; the pressure transmission holes are arranged at the upper part of the central pipe 15 and are at least two, and the minimum inner diameter of the blowout prevention tool of the well operation pipe column is set to be more than 40 mm.
The application method of the blowout prevention tool for the operation pipe column in the well is characterized by comprising the following steps of: the method comprises the following steps:
A. when overflow is found in the well in the operation construction, immediately lowering the underground operation pipe column, sitting the underground operation pipe column on the wellhead turntable, picking the lifting ring, lifting the travelling block according to the well control requirement, braking and alarming;
B. moving a blowout prevention tool of an operation pipe column in the well to a wellhead turntable, lowering a travelling block according to well control requirements, holding an elevator at the position of a lower connector 7, and closing the elevator;
C. a travelling block is lowered, and an in-well operation pipe column blowout prevention tool is inserted into the in-well operation pipe column and descends by self weight;
D. after the fluke 10 is contacted with the internal thread of the coupling in the working string in the well, the travelling block is lifted, a throttle valve in the throttle manifold is opened, and the wellhead blowout preventer is closed, so that a well closing procedure is completed;
in the above process, during the process of lifting the travelling block by the driller, the fluke 10 and the inner support cylinder 11 generate relative displacement, and the fluke 10 is propped up to be clamped with the inner thread in the coupling of the working string in the well and generates anchoring force; at the same time, the programmer may open a throttle valve in the throttle manifold and the secondary driller may close the blowout preventer at the wellhead and walk to the side of the skid to make a blowout preventer closed gesture. The pressure in the well acts on the sealing rubber cylinder 14 through the pressure transmission hole of the central pipe 15, the sealing rubber cylinder 14 expands to finish the setting of the tool, and the annulus between the working string in the well and the tool is sealed. The programmer can then close the throttle valve in the choke manifold and observe the casing pressure, and after the casing pressure stabilizes, the shut-in procedure is completed.
E. The well-flushing pipeline is connected with a well-flushing joint 1 through a well-flushing pipeline joint, a valve plate 4 is opened through a switch sleeve 2 in the process of moving down the well-flushing pipeline joint, and a well-flushing circulation channel is established;
in the process, the lower end part of the well washing and killing pipeline joint is pressed down to enable the switch sleeve 2 to descend, the switch sleeve 2 is firstly pressed down to enable the balance piston 5 to descend, the lower body of the balance piston 5 is separated from the lower end port of the piston mounting hole, a little well liquid enters through a gap between the small-diameter section of the balance piston 5 and the piston mounting hole, pressure below the valve plate 4 is conducted to the position above the valve plate 4, and the pressure difference between the upper side and the lower side of the valve plate 4 is reduced. The switch sleeve 2 continues to descend to jack the valve plate 4 downwards, and a well washing and killing circulation channel is established.
F. Pumping a weighted well repairing liquid into the well operation pipe column through the well operation pipe column blowout prevention tool to circularly wash and kill the well;
G. when the pressure of the oil jacket in the well is 0 after the gravity of the liquid column in the well operation pipe column balances the bottom hole pressure, the well cleaning and killing pipeline joint and the well cleaning and killing pipeline are disassembled, the traveling block and the elevator are lifted up, and the well operation pipe column blowout prevention tool is lifted out of the well operation pipe column, so that well cleaning and killing construction is completed.
In the process, the travelling block and the elevator are lifted up, so that the fluke 10 in the tool and the inner supporting cylinder 11 generate relative displacement, the fluke 10 is retracted, and the anchoring force generated by combination with the internal thread in the coupling of the working string in the well is relieved. The tool is lifted up, lifted up from the operation pipe column in the well, cleaned up and placed at a place convenient to take on a drill floor, and all the construction is finished.
In order to perform blowout control operation at the first time and facilitate use, the tool is placed at a position on a drill floor which is convenient to take.
The embodiments described above are only exemplary embodiments, but the present invention is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present invention should be included in the scope of the present invention. Therefore, the scope of protection is not limited to the description above.
Claims (10)
1. An in-well operation tubular column blowout prevention tool is characterized by comprising a circulating channel opening mechanism, an anchoring mechanism and a sealing mechanism, wherein: the circulating channel opening mechanism is internally provided with a switch sleeve (2), a blowout prevention valve and a lower connector (7), the switch sleeve (2) can open a valve plate (4) arranged in the blowout prevention valve at the lower part of the well washing and killing connector (1), and the outer diameter of the switch sleeve (2) is larger than the minimum inner diameter of the lower connector (7); the anchoring mechanism is provided with an anchor claw (10) and an inner supporting cylinder (11), the anchor claw (10) is connected with the inner supporting cylinder (11) through a sliding pin (9), and the anchor claw (10) can be propped by the inner supporting cylinder (11) and anchored in a coupling of an operation tubular column in a well; the sealing mechanism is provided with a sealing rubber cylinder (14) and a central tube (15), the sealing rubber cylinder (14) is arranged outside the central tube (15), and a pressure transmission hole is arranged in the tube wall of the central tube (15); the well-flushing joint (1) in the circulating channel opening mechanism can be connected with the well-flushing pipeline joint, and the circulating channel opening mechanism, the anchoring mechanism and the sealing mechanism are sequentially connected through the lower joint (7), the fluke (10), the inner supporting cylinder (11) and the sealing mechanism upper joint (12).
2. The blowout prevention tool for an operation pipe column in a well according to claim 1, wherein the blowout prevention valve is further provided with a valve seat (3), the valve seat (3) is in threaded connection with the lower part of the well flushing joint (1), the switch sleeve (2) is installed in the upper inner cavity of the valve seat (3), and the outer diameter of the valve plate (4) is larger than the upper inner cavity of the valve seat (3) and smaller than the lower inner cavity of the valve seat (3); two rotating shafts are machined on one side of the valve plate (4) and are arranged in a shaft hole machined on one side of the valve seat (3), spring rings of the torsion springs (6) are respectively arranged outside the two rotating shafts on one side of the valve plate (4), connecting rods between the two spring rings of the torsion springs (6) are propped against the lower end face of the valve plate (4), and the valve plate (4) can freely turn in the inner cavity of the lower portion of the valve seat (3).
3. The blowout prevention tool for an operation pipe column in a well according to claim 1 or 2, wherein the valve plate (4) is a circular plate with the outer diameter larger than the inner diameter of the switch sleeve (2) and is provided with a pressing groove corresponding to the lower end surface of the switch sleeve (2) on the upper end surface; the plate body at the top of the valve plate (4) is provided with a chamfer and the outer wall of the plate body below the chamfer is big-end-up, a piston mounting hole is arranged in the plate body of the valve plate 4, and a balance piston (5) is arranged in the piston mounting hole.
4. A blowout preventer for an operation string in a well according to claim 3, wherein the body of the balance piston (5) is of an inverted T-shape, the lower outer diameter is larger than the upper outer diameter, the balance piston (5) passes upward through the piston mounting hole from a spring fixed in the piston mounting hole, and the lower body of the balance piston (5) is blocked outside the piston mounting hole; the upper end of the spring is fixed at the top of the piston mounting hole, and the lower end of the spring is fixedly connected with the lower body of the balance piston (5); the upper end surface of the balance piston (5) after the spring is fixed in the piston mounting hole is 5mm-10mm higher than the upper end surface of the valve plate (4); the diameter of the outer side of the piston mounting hole formed in the valve plate (4) is smaller than the outer diameter of the switch sleeve (2) and larger than the inner diameter of the pressing groove in the upper end surface of the valve plate (4).
5. A blowout prevention tool for an operation pipe column in a well according to claim 3, wherein a sealing groove is arranged on the inner wall of the well washing and killing joint (1), sealing grease is filled in the sealing groove, and a grease containing vertical groove is arranged in the upper body wall of the switch sleeve (2); the well washing and killing connector (1) is in clearance fit with the switch sleeve (2), and teflon coatings are arranged on the outer surfaces of the switch sleeve (2), the valve seat (3) and the valve plate (4); the lower part of the well flushing joint (1) is connected with a lower connector (7) and is in threaded connection with a fluke (10) through the lower connector (7), the upper body of the external thread section at the lower part of the lower connector (7) is conical, the conical body above the external thread section at the lower part of the lower connector (7) is matched with an elevator, and the outer diameter of the conical body at the lower part of the lower connector (7) is larger than the inner diameter of the elevator; the outer diameter of the circulation passage opening mechanism is larger than the outer diameters of the anchoring mechanism and the sealing mechanism.
6. A blowout preventer for an operation string in a well according to claim 1, wherein the upper part of the fluke (10) is a fluke joint (8), an internal thread and a limit table are arranged in the upper inner cavity of the fluke joint (8), and the internal thread in the upper inner cavity of the fluke joint (8) can be connected with the lower connector (7) through threads; the fluke joint (8) and the fluke (10) can be integrally manufactured or manufactured separately, and the fluke joint (8) and the fluke (10) are welded during the separate manufacturing; the upper portion of fluke (10) is equipped with the cotter hole and can pack into smooth pin (9), and the lower part of fluke (10) is equipped with three jaw piece at least and the lower part outer wall of all jaw pieces all is equipped with the thick thread, and the lower part inner wall of fluke (10) cooperatees with the lower part outer wall of interior support section of thick bamboo (11) and the thick thread of lower part outer wall can with the internal thread interlock of well operation tubular column coupling.
7. The blowout prevention tool for an operation pipe column in a well according to claim 6, wherein the outer wall of the inner supporting cylinder (11) is a non-constant diameter outer wall, the outer diameter of the outer wall of the upper part of the inner supporting cylinder (11) is larger than the inner diameter of a limit table in the fluke joint (8), the outer wall of the middle part of the inner supporting cylinder (11) is provided with a reducing section serving as a sliding section of the sliding pin (9), and the outer diameter below the sliding section is larger than the inner diameter of the sliding pin (9) formed in the fluke (10) and the inner diameter of the minimum inner cavity of the fluke (10) in a free state; the lower part of the inner supporting cylinder (11) is provided with a conical top expansion section and a threaded connection section; the conical top expansion section at the lower part of the inner support cylinder (11) is matched with the claw piece of the anchor claw (10), and the threaded connection section can be in threaded connection with the upper joint (12) of the sealing mechanism.
8. The blowout prevention tool for an operation pipe column in a well according to claim 1, wherein an upper adjusting ring (13), a lower adjusting ring (16) and a lower joint (17) of the sealing mechanism are further arranged in the sealing mechanism, and two ends of a central pipe (15) are respectively in threaded connection with the upper joint (12) of the sealing mechanism and the lower joint (17) of the sealing mechanism; the upper adjusting ring (13) is connected between the upper joint (12) of the sealing mechanism and the upper joint of the sealing rubber cylinder (14), the lower adjusting ring (16) is connected between the lower joint of the sealing rubber cylinder (14) and the lower joint (17) of the sealing mechanism, and the lower part of the lower joint (17) of the sealing mechanism is provided with standby external threads.
9. The blowout prevention tool for an operation pipe column in a well according to claim 8, wherein sealing rings are arranged between an upper joint (12) of the sealing mechanism and an upper adjusting ring (13) and between a lower adjusting ring (16) and a lower joint (17) of the sealing mechanism; the pressure transmission holes are arranged at the upper part of the central pipe (15) and are at least two, and the minimum inner diameter of the blowout prevention tool of the well operation pipe column is set to be more than 40 mm.
10. A method of using a blowout preventer for a tubular string for well operations according to any one of claims 1 to 9, wherein: the method comprises the following steps: A. when overflow is found in the well in the operation construction, immediately lowering the underground operation pipe column, sitting the underground operation pipe column on the wellhead turntable, picking the lifting ring, lifting the travelling block according to the well control requirement, braking and alarming; B. moving a blowout prevention tool of an operation pipe column in a well to a wellhead turntable, lowering a travelling block according to well control requirements, holding an elevator at a lower connector (7), and closing the elevator; C. a travelling block is lowered, and an in-well operation pipe column blowout prevention tool is inserted into the in-well operation pipe column and descends by self weight; D. after the fluke (10) is contacted with the internal thread of the coupling in the working string in the well, lifting the travelling block, opening a throttle valve in the throttle manifold and closing the wellhead blowout preventer to finish a well closing procedure; E. the well-flushing pipeline is connected with a well-flushing joint (1) through a well-flushing pipeline joint, a valve plate (4) is opened through a switch sleeve (2) in the process of moving down the well-flushing pipeline joint, and a well-flushing circulation channel is established; F. pumping a weighted well repairing liquid into the well operation pipe column through the well operation pipe column blowout prevention tool to circularly wash and kill the well; G. when the pressure of the oil jacket in the well is 0 after the gravity of the liquid column in the well operation pipe column balances the bottom hole pressure, the well cleaning and killing pipeline joint and the well cleaning and killing pipeline are disassembled, the traveling block and the elevator are lifted up, and the well operation pipe column blowout prevention tool is lifted out of the well operation pipe column, so that well cleaning and killing construction is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210844924.4A CN117468884A (en) | 2022-07-19 | 2022-07-19 | Blowout prevention tool for well operation pipe column and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210844924.4A CN117468884A (en) | 2022-07-19 | 2022-07-19 | Blowout prevention tool for well operation pipe column and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119352921A (en) * | 2024-12-24 | 2025-01-24 | 西安石油大学 | A full-bore wellhead control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119352921A (en) * | 2024-12-24 | 2025-01-24 | 西安石油大学 | A full-bore wellhead control device |
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