CN111155966A - Underground annular emergency opening device - Google Patents

Underground annular emergency opening device Download PDF

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Publication number
CN111155966A
CN111155966A CN201911385205.5A CN201911385205A CN111155966A CN 111155966 A CN111155966 A CN 111155966A CN 201911385205 A CN201911385205 A CN 201911385205A CN 111155966 A CN111155966 A CN 111155966A
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CN
China
Prior art keywords
piston
sealing
shearing
joint
section cylinder
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CN201911385205.5A
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Chinese (zh)
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CN111155966B (en
Inventor
刘海英
邓建明
马英文
刘敏
刘阳
张彬奇
马长亮
王波
万祥
刘志龙
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CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
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CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
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Priority to CN201911385205.5A priority Critical patent/CN111155966B/en
Publication of CN111155966A publication Critical patent/CN111155966A/en
Application granted granted Critical
Publication of CN111155966B publication Critical patent/CN111155966B/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/08Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained

Abstract

The invention discloses an underground annular emergency opening device which is characterized in that an upper joint, a piston cavity, an upper section of cylinder body, a middle section of cylinder body, a non-return sleeve, a lower section of cylinder body and a lower joint are sequentially fixedly and hermetically connected; a shearing piston and a hanging core pipe which are fixedly connected are arranged in the piston cavity, the upper section cylinder and the middle section cylinder; the piston cavity and the shearing piston are axially positioned through the shear pin; the middle section cylinder, the non-return sleeve and the lower section cylinder are internally provided with a hanging cylinder, a non-return core pipe and a sealing joint which are fixedly connected from top to bottom in sequence; a free spring I is arranged in an annular space formed by the upper section cylinder body and the hanging core tube, and the lower end face of the spring I is in contact fit with the upper end face of the middle section cylinder body; a blocking ring and a spring II are arranged in an annular space formed by the lower section cylinder body and the check core pipe, and the spring II is in contact fit with the lower end face of the check sleeve and the upper end face of the blocking ring and is in a compressed state.

Description

Underground annular emergency opening device
Technical Field
The invention relates to the technical field of oil exploitation, in particular to an underground annular emergency opening device.
Background
In a common downhole tubular column of an oil well, in order to meet the requirements of operation safety and technological measures, a downhole air release valve and a downhole packer are often required to be matched for use. Normally, the downhole packer is connected in series in the pipe string, and the downhole air release valve is installed on the downhole packer. The underground packer after being set divides the underground annulus into an upper annulus and a lower annulus, and the communication of the upper annulus and the lower annulus is controlled by an underground air bleed valve controlled by ground pressure.
However, when the downhole air release valve cannot be opened due to a fault, the problems that the upper annulus and the lower annulus cannot be communicated, the downhole pressure cannot be released, the well control fluid cannot be injected and the like are caused, and great troubles are brought to production and other operations. For this reason, sometimes a downhole annular emergency opening device is also required to be run in on the basis of a downhole gas valve and a downhole packer.
The existing underground annular emergency opening devices mainly comprise two devices, wherein one device is free of an inner drift diameter, and is independently installed on an underground packer during use to independently control a communication channel of an upper annular space and a lower annular space; the other type is provided with an inner drift diameter, and is arranged between an underground air release valve and an underground packer during use, and the inner drift diameter and the underground air release valve jointly control a communication channel of an upper annular space and a lower annular space.
Above-mentioned two kinds of emergent opening device of annular space in pit have now all through pure differential pressure control, need follow the well head to annular space injection pressure in the pit when opening, when the difference of upper portion annular space pressure and lower part annular space pressure reaches the opening pressure differential of settlement, emergent opening device of annular space in the pit opens. The disadvantages of this solution are: when the lower annulus pressure is higher, the injection pressure required to open the downhole annulus emergency opening device is correspondingly higher, for example: the opening pressure difference of the underground annular emergency opening device is 7MPa, the lower annular pressure is 15MPa, the upper annular pressure required for opening the underground annular emergency opening device is 22MPa, the condition that the required opening pressure exceeds the rated working pressure of a wellhead can occur, and emergency opening cannot be carried out.
Disclosure of Invention
The invention aims to provide an underground annular emergency opening device with maximum opening pressure not affected by underground pressure, mainly aiming at the problem that the conventional underground annular emergency opening device cannot be opened emergently under the condition of high underground pressure.
The purpose of the invention is realized by the following technical scheme.
The invention relates to an underground annular emergency opening device which comprises an upper joint, a piston cavity, an upper section cylinder, a middle section cylinder, a non-return sleeve, a lower section cylinder, a lower joint, a shearing piston, a shearing nail, a hanging core pipe, a spring I, a hanging sleeve, a non-return core pipe, a spring II, a baffle ring and a sealing joint, wherein the whole interior is hollow;
the upper joint, the piston cavity, the upper section of barrel, the middle section of barrel, the non-return sleeve, the lower section of barrel and the lower joint are sequentially fixedly and hermetically connected from top to bottom;
shearing pistons and hanging core pipes which are fixedly connected with each other are arranged in the piston cavity, the upper section cylinder body and the middle section cylinder body; the piston cavity and the shearing piston are axially positioned through a shear pin;
the middle section cylinder, the non-return sleeve and the lower section cylinder are internally provided with a hanging cylinder, a non-return core pipe and a sealing joint which are fixedly connected from top to bottom in sequence;
a free spring I is arranged in an annular space formed by the upper section cylinder and the hanging core tube, and the lower end face of the spring I is in contact fit with the upper end face of the middle section cylinder;
and a blocking ring and a spring II are arranged in an annular space formed by the lower section cylinder body and the check core pipe, and the spring II is in contact fit with the lower end face of the check sleeve and the upper end face of the blocking ring and is in a compressed state.
The diameter of a sealing surface at the lower part of the outer diameter of the shearing piston is smaller than that of a sealing surface at the middle part of the inner diameter of the piston cavity; after the shearing piston is matched with the shear pin, a space for the shearing piston to move upwards and shear the shear pin is arranged between the upper part of the shearing piston and the upper joint, and a space for the shearing piston to move downwards and shear the shear pin is arranged between the shoulder of the outer diameter of the shearing piston and the piston cavity.
After the shear pin is sheared, the shearing piston firstly drives the hanging core pipe to be hung with the hanging cylinder body, and then drives the hanging core pipe to store energy for the spring I.
The middle part of the outer diameter of the sealing joint is provided with a sealing ring matched with the sealing surface of the middle part of the inner diameter of the lower section cylinder body, and the lower end of the sealing joint is provided with a sealing spherical surface matched with the sealing surface at the upper end of the lower joint; the diameter of the matching part of the sealing spherical surface at the lower end of the sealing joint and the sealing surface at the upper end of the lower joint is equal to the inner diameter of the sealing surface at the middle part of the lower section cylinder; and under the action of the spring II, the sealing spherical surface at the lower end of the sealing joint is in sealing fit with the sealing surface at the upper end of the lower joint.
The piston cavity is provided with a sealing surface in the middle of the inner diameter, a sealing ring is arranged on the lower portion of the inner diameter, a shoulder used for limiting the shearing piston is arranged between the sealing surface and the sealing ring in the inner diameter, a radial shearing nail hole used for installing a shearing nail is formed in the middle of the outer diameter along the circumferential direction, and radial pressure transmitting holes are formed above and below the shearing nail hole along the circumferential direction.
The lower section cylinder is provided with a sealing surface in the middle of the inner diameter thereof, and a radial overflowing hole is arranged at the lower part of the sealing surface and along the circumferential direction.
The hanging core pipe is provided with a circular bead at the upper part of the outer diameter of the hanging core pipe, elastic claws are arranged at the lower part of the hanging core pipe, and hook teeth are arranged on the outer diameter of each elastic claw.
And the lower part of the inner diameter of the check sleeve is provided with a hook tooth.
The upper part of the inner diameter of the hanging cylinder body is provided with a hook tooth.
The middle part of the check core pipe is provided with elastic claws, and the outer diameter of each elastic claw is provided with a hook tooth.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the invention, the pressure of the underground lower annulus is utilized to store energy for the spring, then the pressure difference of the upper annulus and the lower annulus is controlled to control the shearing piston to move upwards, and the underground annulus emergency opening device is opened under the combined action of the pressure difference and the spring force, so that the required opening pressure is controlled within a reasonable range, the problem of overhigh operation pressure of a wellhead is avoided to a certain extent, and the difficulty of field operation is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of the closed state of the present invention.
Reference numerals: 1 top connection, 2 piston chamber, 3 upper segment barrels, 4 middle section barrels, 5 non-return sleeves, 6 lower segment barrels, 7 lower connection, 8 shearing pistons, 9 shearing nails, 10 hanging core pipes, 11 spring I, 12 hanging sleeves, 13 non-return core pipes, 14 spring II, 15 retaining rings and 16 sealing joints.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the underground annular emergency opening device mainly comprises an upper joint 1, a piston cavity 2, an upper section cylinder 3, a middle section cylinder 4, a non-return sleeve 5, a lower section cylinder 6, a lower joint 7, a shearing piston 8, a shearing nail 9, a hanging core pipe 10, a spring I11, a hanging sleeve 12, a non-return core pipe 13, a spring II 14, a retaining ring 15, a sealing joint 16 and the like, and the whole interior is hollow.
The upper joint 1, the piston cavity 2, the upper section cylinder 3, the middle section cylinder 4, the non-return sleeve 5, the lower section cylinder 6 and the lower joint 7 are sequentially fixedly and hermetically connected from top to bottom.
The upper end of the upper joint 1 is provided with internal threads, and the lower part of the outer diameter of the upper joint is fixedly and hermetically connected with the piston cavity 2.
The piston cavity 2 is provided with a sealing surface in the middle of the inner diameter, a sealing ring is arranged on the lower portion of the inner diameter, a shoulder used for limiting the shearing piston 8 is arranged between the sealing surface and the sealing ring in the inner diameter, a plurality of radial shearing nail holes used for installing shearing nails 9 are formed in the middle of the outer diameter along the circumferential direction, a plurality of radial pressure transmitting holes are formed above and below the shearing nail holes along the circumferential direction, and the upper section cylinder 3 is fixedly and hermetically connected to the lower portion of the outer diameter.
The upper section cylinder 3 is fixedly and hermetically connected with the middle section cylinder 4 at the lower part of the inner diameter thereof.
The middle section barrel 4 is fixedly and hermetically connected with the non-return sleeve 5 at the lower part of the inner diameter thereof.
The lower part of the inner diameter of the non-return sleeve 5 is provided with hook teeth, and the lower part of the outer diameter of the non-return sleeve is fixedly and hermetically connected with the lower section cylinder 6.
The lower section cylinder body 6 is provided with a sealing surface in the middle of the inner diameter thereof, a radial overflowing hole is arranged at the lower part of the sealing surface along the circumferential direction, and the lower joint 7 is fixedly and hermetically connected at the lower part of the overflowing hole in the inner diameter thereof.
The upper end of the lower joint 7 is provided with a sealing surface, and the lower part of the outer diameter of the lower joint is provided with an external thread.
The piston cavity 2, the upper section cylinder 3 and the middle section cylinder 4 are internally provided with a shearing piston 8 and a hanging core tube 10 which are fixedly connected with each other, and the shearing piston 8 and the hanging core tube 11 form a whole A.
The shearing piston 8 is provided with a sealing ring which is used for being matched with a sealing surface at the middle part of the inner diameter of the piston cavity 2 at the upper part of the outer diameter, a sealing surface which is used for being matched with a sealing ring at the lower part of the inner diameter of the upper section cylinder 2 at the middle part of the outer diameter, a circumferential annular groove which is used for being matched with a shear pin 9 and a shoulder which is used for being in limit matching with the piston cavity 2 are arranged between the sealing ring at the upper part of the outer diameter and the sealing ring at the middle part of the outer diameter. The diameter of the sealing surface at the lower part of the outer diameter of the shearing piston 8 is smaller than that of the sealing surface at the middle part of the inner diameter of the piston cavity 2.
The hanging core tube 10 is provided with a shoulder at the upper part of the outer diameter thereof, a plurality of elastic claws are arranged at the lower part thereof, and the outer diameter of each elastic claw is provided with a hook tooth.
A free spring I11 is arranged in an annular space formed by the upper section cylinder 3 and the hanging core tube 10, and the lower end face of the spring I11 is in contact fit with the upper end face of the middle section cylinder 4.
After the shearing piston 8 is matched with the shear pin 9, a space for the shearing piston 8 to move upwards and shear the shear pin 9 is arranged between the upper part of the shearing piston 8 and the upper connector 1, a space for the shearing piston 8 to move downwards and shear the shear pin 9 is arranged between the shoulder of the outer diameter of the shearing piston 8 and the piston cavity 2, and the hanging core tube 10 is separated from the hanging cylinder 5. After the shear pin 9 is sheared off, the shear piston 8 firstly drives the hanging core tube 10 to be hung with the hanging cylinder 12, and then drives the hanging core tube 10 to store energy for the spring I11.
Middle section barrel 4, non return sleeve 5 and the inside fixed connection's that articulates barrel 12, non return core pipe 13 and sealing joint 16 from top to bottom in proper order that is equipped with of hypomere barrel 6, just articulate sleeve 12, non return core pipe 13 and sealing joint 16 and form whole B.
The upper part of the inner diameter of the hanging cylinder 12 is provided with hook teeth; the lower part of the inner diameter of the check core pipe is fixedly connected with the check core pipe 13.
The middle of the check core pipe 13 is provided with a plurality of elastic claws, the outer diameter of each elastic claw is provided with a hook tooth, and the lower part of the outer diameter of each elastic claw is fixedly connected with the sealing joint 16.
And the middle part of the outer diameter of the sealing joint 16 is provided with a sealing ring matched with the sealing surface of the middle part of the inner diameter of the lower section cylinder 6, and the lower end of the sealing joint is provided with a sealing spherical surface matched with the sealing surface at the upper end of the lower joint 7. The diameter of the matching part of the sealing spherical surface at the lower end of the sealing joint 16 and the sealing surface at the upper end of the lower joint 7 is equal to the inner diameter of the sealing surface at the middle part of the lower cylinder 6.
A baffle ring 15 and a spring II 14 are arranged in an annular space formed by the lower section cylinder body 6 and the check core tube 13, and the spring II 14 is in contact fit with the lower end face of the check sleeve 5 and the upper end face of the baffle ring 15 and is in a compressed state.
After the integral connection is completed, the shearing piston 8 and the piston cavity 2 are axially positioned through the shearing nail 9. Under the action of the spring II 14, the sealing spherical surface at the lower end of the sealing joint 16 is in sealing fit with the sealing surface at the upper end of the lower joint 7.
When going into the well, need to concatenate between bleed valve and the packer in the pit, promptly: the internal thread on the upper part of the inner diameter of the upper joint is fixedly and hermetically connected with the lower end of an underground air release valve, and the external thread on the lower part of the outer diameter of the lower joint is fixedly and hermetically connected with an original well air release valve interface on an underground packer.
When opening, need open emergent opening device of annular space in the pit according to actual conditions upper portion annular pressure of program control according to regulation, specifically as follows:
and setting the pressure of the lower annular space as X and the pressure required by shearing all the shear pins as Y.
When X is less than Y, injecting pressure X + Y into the upper annulus from the wellhead, wherein the pressure of the upper annulus is greater than the pressure of the lower annulus, the pressure difference reaches the pressure required by the shearing of all shear pins, and the shear pins are sheared by the integral A moving upwards under the action of the pressure; then releasing the upper annular pressure from the wellhead, wherein the whole A moves downwards under the action of the pressure because the lower annular pressure is greater than the upper annular pressure, the whole A is connected with the whole B in a hanging manner, and the spring 1 is compressed; and injecting pressure from the wellhead to the upper annular space again, enabling the whole A and the whole B to simultaneously move upwards under the combined action of the pressure difference and the spring 1, and enabling the check core pipe to be hung and locked with the check sleeve to complete opening action.
When X is larger than or equal to Y, releasing the upper annular pressure from the wellhead, and at the moment, because the lower annular pressure is larger than the upper annular pressure and the pressure difference reaches the pressure required by shearing all shear pins, moving the whole A downwards and shearing the shear pins under the action of the pressure, hanging the whole A and the whole B, and compressing the spring 1; and injecting pressure from the wellhead to the upper annular space again, enabling the whole A and the whole B to simultaneously move upwards under the combined action of the pressure difference and the spring 1, and enabling the check core pipe to be hung and locked with the check sleeve to complete opening action.
In this example, Y should be taken as small as possible while satisfying the relevant requirements, for example, when X > 0MPa, Y ═ 7MPa, and the required maximum opening pressure is 14 MPa.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.

Claims (10)

1. An underground annular emergency opening device is characterized by comprising an upper joint (1), a piston cavity (2), an upper section cylinder (3), a middle section cylinder (4), a non-return sleeve (5), a lower section cylinder (6), a lower joint (7), a shearing piston (8), a shearing nail (9), a hanging core pipe (10), a spring I (11), a hanging sleeve (12), a non-return core pipe (13), a spring II (14), a baffle ring (15) and a sealing joint (16), wherein the whole interior is hollow;
the upper joint (1), the piston cavity (2), the upper section cylinder (3), the middle section cylinder (4), the non-return sleeve (5), the lower section cylinder (6) and the lower joint (7) are sequentially fixedly and hermetically connected from top to bottom;
a shearing piston (8) and a hanging core pipe (10) which are fixedly connected with each other are arranged in the piston cavity (2), the upper section cylinder (3) and the middle section cylinder (4); the piston cavity (2) and the shearing piston (8) are axially positioned through a shear pin (9);
a hanging cylinder body (12), a non-return core pipe (13) and a sealing joint (16) which are fixedly connected from top to bottom are arranged in the middle section cylinder body (4), the non-return sleeve (5) and the lower section cylinder body (6);
a free spring I (11) is arranged in an annular space formed by the upper section cylinder (3) and the hanging core tube (10), and the lower end face of the spring I (11) is in contact fit with the upper end face of the middle section cylinder (4);
a blocking ring (15) and a spring II (14) are arranged in an annular space formed by the lower section cylinder body (6) and the check core pipe (13), and the spring II (14) is in contact fit with the lower end face of the check sleeve (5) and the upper end face of the blocking ring (15) and is in a compression state.
2. A downhole annulus emergency opening device according to claim 1, wherein the diameter of the sealing surface at the lower part of the outer diameter of the shear piston (8) is smaller than the sealing surface at the middle part of the inner diameter of the piston chamber (2); after the shearing piston (8) is matched with the shearing nail (9), a space for the shearing piston to move upwards and shear the shearing nail (9) is formed between the upper part of the shearing piston (8) and the upper joint (1), and a space for the shearing piston to move downwards and shear the shearing nail (9) is formed between the shoulder of the outer diameter of the shearing piston (8) and the piston cavity (2).
3. The downhole emergency opening device for the annulus according to claim 1, wherein the shear piston (8) drives the hitching core tube (10) to hitch with the hitching cylinder (12) first after shearing the shear pin (9), and then drives the hitching core tube (10) to store energy in the spring I (11).
4. A downhole emergency opening device for an annulus according to claim 1, wherein the sealing joint (16) is provided with a sealing ring at the middle part of the outer diameter thereof for matching with the sealing surface at the middle part of the inner diameter of the lower cylinder (6), and is provided with a sealing spherical surface at the lower end thereof for matching with the sealing surface at the upper end of the lower joint (7); the diameter of the matching part of the sealing spherical surface at the lower end of the sealing joint (16) and the sealing surface at the upper end of the lower joint (7) is equal to the inner diameter of the sealing surface at the middle part of the lower section cylinder body (6); and under the action of the spring II (14), the sealing spherical surface at the lower end of the sealing joint (16) is in sealing fit with the sealing surface at the upper end of the lower joint (7).
5. A downhole emergency opening device according to claim 1, wherein the piston chamber (2) is provided with a sealing surface in the middle of its inner diameter, a sealing ring in the lower part of its inner diameter, a shoulder for limiting the shear piston (8) between the sealing surface and the sealing ring in its inner diameter, a radial shear pin hole for installing shear pins (9) in the middle of its outer diameter in the circumferential direction, and radial pressure transmitting holes in the circumferential direction above and below the shear pin hole.
6. A downhole emergency opening device according to claim 1, wherein the lower section of the cylinder (6) is provided with a sealing surface in the middle of its inner diameter and with radial through-flow holes in the lower part and circumferentially below the sealing surface.
7. A downhole annulus emergency opening device according to claim 1, wherein the hitching core tube (10) is provided with a shoulder at the upper part of its outer diameter and elastic claws at the lower part, and each elastic claw is provided with a hooking tooth at its outer diameter.
8. A downhole annulus emergency opening device according to claim 1, wherein the check sleeve (5) is provided with hooking teeth at the lower part of its inner diameter.
9. A downhole emergency opening device according to claim 1, wherein the hitching cylinder (12) is provided with hooking teeth at the upper part of the inner diameter.
10. A downhole annulus emergency opening device according to claim 1, wherein the check core tube (13) is provided with elastic claws in the middle, and each elastic claw is provided with a hook tooth on the outer diameter.
CN201911385205.5A 2019-12-28 2019-12-28 Underground annular emergency opening device Active CN111155966B (en)

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Application Number Priority Date Filing Date Title
CN201911385205.5A CN111155966B (en) 2019-12-28 2019-12-28 Underground annular emergency opening device

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Application Number Priority Date Filing Date Title
CN201911385205.5A CN111155966B (en) 2019-12-28 2019-12-28 Underground annular emergency opening device

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CN111155966A true CN111155966A (en) 2020-05-15
CN111155966B CN111155966B (en) 2022-02-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112049601A (en) * 2020-09-30 2020-12-08 中国石油天然气集团有限公司 Shaft packing device near wellhead of oil and gas well and using method thereof

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CN203335031U (en) * 2013-06-20 2013-12-11 中国石油集团长城钻探工程有限公司 Multilateral deep well emergency flow guide switch
CN104131800A (en) * 2014-07-18 2014-11-05 中国海洋石油总公司 Thermal production well annulus safety control tool
US20170335656A1 (en) * 2016-05-19 2017-11-23 Spring Oil Tools Llc Controlled opening valve
CN206668213U (en) * 2017-02-10 2017-11-24 中国海洋石油总公司 A kind of underground vent valve
US20190120013A1 (en) * 2014-01-23 2019-04-25 Pioneer Natural Resources Usa, Inc. Differential safety valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201187279Y (en) * 2007-12-03 2009-01-28 大港油田集团有限责任公司 Downhole differential pressure type normal open valve
CN102022092A (en) * 2010-11-20 2011-04-20 中国石油集团西部钻探工程有限公司 Open hole packer and tapping tool used together with same
CN103415674A (en) * 2011-02-10 2013-11-27 哈里伯顿能源服务公司 System and method for servicing a wellbore
CN203335031U (en) * 2013-06-20 2013-12-11 中国石油集团长城钻探工程有限公司 Multilateral deep well emergency flow guide switch
US20190120013A1 (en) * 2014-01-23 2019-04-25 Pioneer Natural Resources Usa, Inc. Differential safety valve
CN104131800A (en) * 2014-07-18 2014-11-05 中国海洋石油总公司 Thermal production well annulus safety control tool
US20170335656A1 (en) * 2016-05-19 2017-11-23 Spring Oil Tools Llc Controlled opening valve
CN206668213U (en) * 2017-02-10 2017-11-24 中国海洋石油总公司 A kind of underground vent valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112049601A (en) * 2020-09-30 2020-12-08 中国石油天然气集团有限公司 Shaft packing device near wellhead of oil and gas well and using method thereof
CN112049601B (en) * 2020-09-30 2023-11-17 中国石油天然气集团有限公司 Wellbore packer device at near wellhead of oil and gas well and application method thereof

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