CN212105827U - Double-tube separate injection tool capable of drilling bridge plug - Google Patents
Double-tube separate injection tool capable of drilling bridge plug Download PDFInfo
- Publication number
- CN212105827U CN212105827U CN202020674151.6U CN202020674151U CN212105827U CN 212105827 U CN212105827 U CN 212105827U CN 202020674151 U CN202020674151 U CN 202020674151U CN 212105827 U CN212105827 U CN 212105827U
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- Prior art keywords
- bridge plug
- pipe
- mandrel
- insertion pipe
- sealing
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- Withdrawn - After Issue
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- 238000002347 injection Methods 0.000 title claims abstract description 33
- 239000007924 injection Substances 0.000 title claims abstract description 33
- 238000005553 drilling Methods 0.000 title description 7
- 238000007789 sealing Methods 0.000 claims abstract description 65
- 238000003780 insertion Methods 0.000 claims abstract description 50
- 230000037431 insertion Effects 0.000 claims abstract description 50
- 239000010410 layer Substances 0.000 claims description 41
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 125000006850 spacer group Chemical group 0.000 claims description 20
- 210000000078 claw Anatomy 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 12
- 239000002195 soluble material Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical group C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention relates to the technical field of water injection and polymer injection in oil fields, in particular to a drillable bridge plug double-tube separate injection tool, which comprises a wellhead separate injection pipeline, an upper bridge plug, a lower bridge plug, an outer pipe column and an inner pipe column, wherein the upper bridge plug and the lower bridge plug are hollow bridge plugs, the outer pipe column is hermetically inserted in the upper bridge plug, the inner pipe column penetrates through the outer pipe column and is hermetically inserted in the lower bridge plug, and an annular space is reserved between the inner pipe column and the outer pipe column; the outer pipe column comprises an outer oil pipe, an upper insertion pipe centralizer and an upper sealing insertion pipe, which are sequentially connected from top to bottom, wherein the upper sealing insertion pipe is inserted in the upper bridge plug in a sealing manner; the inner tubular column comprises an inner oil pipe, a lower-layer sealing insertion pipe and a lower insertion pipe centralizer which are sequentially connected from top to bottom, wherein the lower-layer sealing insertion pipe is inserted in the lower-layer bridge plug in a sealing mode. The invention solves the problem that the tubular column of the existing concentric double-tube separate injection process is unreliable, and the invention has reliable sealing.
Description
Technical Field
The invention relates to the technical field of oilfield water injection and polymer injection, in particular to a drillable bridge plug double-tube separate injection tool.
Background
The concentric double-tube separate injection technology can well solve the problem of outstanding interlayer contradiction, each layer corresponds to a corresponding oil pipe after each layer is sealed and separated by adopting a packer, injection flow of each layer is adjusted through a wellhead separate injection technology to form throttling pressure difference, and the contradiction of large interlayer injection pressure difference is solved.
The concentric double-tube separate injection string is composed of an inner tube, an outer tube, two packers and two sealing devices, wherein the two packers are respectively arranged at the upper end and the lower end of the outer tube, the sealing devices seal the inner tube and the outer tube to form two mutually independent injection channels, the sealing effect of the sealing devices directly determines whether the concentric double-tube separate injection succeeds or not, but the existing sealing devices have the defect of poor sealing effect, so that the conventional concentric double-tube separate injection string is low in reliability.
Disclosure of Invention
In order to solve the problem of low reliability of a conventional concentric double-tube separate injection string in the background technology, the invention provides a drillable bridge plug double-tube separate injection tool which has high reliability.
The technical scheme provided by the invention is as follows: a drillable bridge plug double-tube separate injection tool comprises a wellhead separate injection pipeline, an upper bridge plug, a lower bridge plug, an outer pipe column and an inner pipe column, wherein the upper bridge plug and the lower bridge plug are hollow bridge plugs, the upper bridge plug and the lower bridge plug are seated and sealed on the inner wall of a sleeve one above the other, the outer pipe column is hermetically inserted in the upper bridge plug, the inner pipe column penetrates through the outer pipe column and is hermetically inserted in the lower bridge plug, and an annular space is reserved between the inner pipe column and the outer pipe column; the outer pipe column comprises an outer oil pipe, an upper insertion pipe centralizer and an upper sealing insertion pipe, which are sequentially connected from top to bottom, wherein the upper sealing insertion pipe is inserted in the upper bridge plug in a sealing manner; the inner tubular column comprises an inner oil pipe, a lower-layer sealing insertion pipe and a lower insertion pipe centralizer which are sequentially connected from top to bottom, wherein the lower-layer sealing insertion pipe is inserted in the lower-layer bridge plug in a sealing manner;
the upper-layer bridge plug comprises a mandrel A, an axial hollow channel is arranged on the inner side of the mandrel A, the mandrel A is sequentially sleeved with an upper spacing ring A, an upper slip A, an upper vertebral body A, a sealing assembly A, a lower vertebral body A, a lower slip A and a lower spacing ring A from top to bottom, a cutting sleeve A is arranged between the lower part of the mandrel A and the lower spacing ring A, the upper end of the cutting sleeve A is divided into six fan-shaped claws, unidirectional locking teeth are processed on the inner sides of the fan-shaped claws, locking teeth meshed with the unidirectional locking teeth are processed on the outer sides of the corresponding mandrels A, a push ring A is connected to the lower end of the cutting sleeve A in a threaded mode, an upper coupling piece is connected to the lower end of the push ring A in a threaded mode;
the lower-layer bridge plug comprises a mandrel B, an axial hollow channel is arranged on the inner side of the mandrel B, the upper end of the mandrel B is connected with a lower coupling piece coupled with the upper coupling piece, the mandrel B below the lower coupling piece is sequentially sleeved with an upper slip B, an upper cone B, a sealing assembly B, a lower cone B, a lower slip B and a lower spacer ring B from top to bottom, a cutting sleeve B is arranged between the lower part of the mandrel B and the lower spacer ring B, the upper end of the cutting sleeve B is divided into six fan-shaped claws, one-way locking teeth are processed on the inner sides of the fan-shaped claws, locking teeth meshed with the one-way locking teeth are processed on the outer sides of the corresponding mandrels B, the lower end of the cutting sleeve B is in threaded connection with a push ring B, the lower end of the push ring B is in;
the upper-layer sealing insertion pipe comprises an upper insertion pipe body, at least 2 groups of sealing rubber ring groups are axially and uniformly arranged on the outer side of the upper insertion pipe body, a blowout prevention valve is mounted at the lower part of the upper insertion pipe body, the lower end of the upper insertion pipe body is connected with a conical guide body, and the conical guide body is made of soluble materials;
the lower-layer sealed insertion tube comprises a lower insertion tube body, and at least 2 groups of sealing rubber ring groups are axially and uniformly arranged on the outer side of the lower insertion tube body;
the lower cannula centralizer comprises a main body part and a spring piece for centralizing, wherein the maximum outer diameter of the main body part is smaller than the inner diameter of a mandrel B of the lower bridge plug;
furthermore, an interlayer special oil pipe is connected between the inner oil pipe and the lower layer sealing insertion pipe, the interlayer special oil pipe is positioned on the inner side of a section where the upper layer sealing insertion pipe is positioned, and the outer diameter of the interlayer special oil pipe in the section is smaller than that of the inner oil pipe.
The invention has the beneficial effects that:
in the concentric double-tube separate injection process in the prior art, a sealing device must be arranged between an inner tube and an outer tube, and the sealing effect of the sealing device is poor, so that the reliability of the conventional concentric double-tube separate injection pipe column is low. Compared with the prior art, the invention realizes water injection to two water injection layers by utilizing two independent bridge plugs and two sets of tubular columns which are hermetically inserted in the bridge plugs, and the two layers are independently metered and allocated. Its advantage is high long-term sealing reliability.
The coupling piece is arranged between the two bridge plugs, and when the upper bridge plug is drilled and milled, the upper bridge plug can fall on the lower bridge plug to form interlocking, so that the two bridge plugs can be removed by drilling once.
When the pipe string blowout preventer is used for producing an inner pipe string, the blowout preventer valve is arranged at the lower part of the upper-layer sealing insertion pipe and can play a blowout preventing role.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the structure of the upper bridge plug of the present invention.
FIG. 3 is a schematic view of the structure of the lower bridge plug of the present invention.
Fig. 4 is a schematic structural view of the middle and upper layer sealed cannula of the present invention.
In the figure: 1-wellhead separate injection pipeline, 2-upper bridge plug, 3-lower bridge plug, 4-outer oil pipe, 5-upper sealing cannula, 6-inner oil pipe, 7-lower sealing cannula, 8-interlayer special oil pipe, 201-mandrel A, 202-upper spacer ring A, 203-upper slip A, 204-upper cone A, 205-sealing assembly A, 206-lower cone A, 207-lower slip A, 208-lower spacer ring A, 209-ferrule A, 210-push ring A, 211-upper coupling, 301-lower coupling, 302-upper slip B, 303-upper cone B, 304-sealing assembly B, 305-lower cone B, 306-lower slip B, 307-lower spacer ring B, 308-ferrule B, 310-push ring B, 311-mandrel B, 501-upper cannula body, 502-blowout preventer valve, 503-conical guide body.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Referring to the attached drawings 1-4, the invention comprises a wellhead separate injection pipeline 1, wherein the wellhead separate injection pipeline 1 comprises two pipelines, one pipeline is communicated with annular cavities of inner and outer oil pipes 6 and 4, and the other pipeline is communicated with an inner cavity of the inner oil pipe 6.
The invention also comprises an upper bridge plug 2, a lower bridge plug 3, an outer tubular column and an inner tubular column, wherein the upper bridge plug 2 and the lower bridge plug 3 are both hollow bridge plugs, the upper bridge plug 2 and the lower bridge plug 3 are seated and sealed on the inner wall of the casing pipe one above the other, the casing pipe is a 5-inch casing pipe in the embodiment, and the outer tubular column is hermetically inserted in the upper bridge plug 2 to realize the sealing of the annulus above the upper bridge plug 2. The inner pipe column penetrates through the outer pipe column and is inserted in the lower layer bridge plug 3 in a sealing mode, an annular space is reserved between the inner pipe column and the outer pipe column, communication and sealing of annular space between the two bridge plugs and annular space between the two pipe columns are achieved, three independent channels of an oil sleeve annular space, a double-pipe column annular space and an inner oil pipe 6 inner cavity are formed, water is injected into two water injection layers through the double-pipe annular space and the small oil pipe, and independent metering and allocation of two layers are achieved.
The invention is designed according to 35Mpa pressure grade, is suitable for 51/2-inch casing pipes, and has the working temperature: the temperature is-30 ℃ to 120 ℃, and compared with the conventional concentric double-tube separate injection process, the invention has the advantage of high long-term sealing reliability.
The outer pipe column comprises an outer oil pipe 4, an upper insertion pipe centralizer and an upper layer sealing insertion pipe 5 which are sequentially connected from top to bottom, wherein the upper layer sealing insertion pipe 5 is hermetically inserted in the upper layer bridge plug 2. The inner tubular column comprises an inner oil pipe 6, a lower-layer sealing insertion pipe 7 and a lower insertion pipe centralizer which are sequentially connected from top to bottom, wherein the lower-layer sealing insertion pipe 7 is inserted in the lower-layer bridge plug 3 in a sealing mode. The upper-layer bridge plug 2 comprises a mandrel A201, an axial hollow channel is arranged on the inner side of the mandrel A201, the mandrel A201 is sequentially sleeved with an upper spacer ring A202, an upper slip A203, an upper vertebral body A204, a sealing assembly A205, a lower vertebral body A206, a lower slip A207 and a lower spacer ring A208 from top to bottom, a cutting sleeve A209 is arranged between the lower part of the mandrel A201 and the lower spacer ring A208, the upper end of the cutting sleeve A209 is divided into six fan-shaped claws, one-way locking teeth are processed on the inner sides of the fan-shaped claws, locking teeth meshed with the one-way locking teeth are processed on the outer side of the corresponding mandrel A201, the upper end of the cutting sleeve A209 abuts against the lower spacer ring A208, the cutting sleeve A209 can only move upwards relative to the mandrel A201, and therefore the lower spacer ring A208 is limited to move downwards relative. The lower end of the cutting sleeve A209 is in threaded connection with a push ring A210, the lower end of the push ring A210 is in threaded connection with an upper coupling piece 211, and the upper end of the upper coupling piece 211 abuts against the lower spacer ring A208.
And the upper layer bridge plug 2 is set and released by a bridge plug setting tool, and the upper layer bridge plug 2 is set on the casing.
In order to facilitate rapid drilling and milling, main body components of the upper layer bridge plug 2 and the lower layer bridge plug 3 are made of resin-fiber reinforced composite materials, the mandrel A201 is made of stainless steel, the sealing performance of the mandrel A is improved, the upper slip and the lower slip are made of carbonitriding stainless steel, sealing rubber is butadiene-acrylonitrile rubber, the temperature resistance of 120 ℃ can be met, the service life of the mandrel A is not less than 6 years, the lower end of the push ring A210 is in threaded connection with an upper coupling piece 211, the upper coupling piece can fall onto the lower layer bridge plug 3 during drilling and milling to form interlocking, two bridge plugs can be removed by one drilling, and the drilling and milling time of a single bridge plug is not more than 1.5 hours (.
The upper end of the upper coupling piece 211 abuts against the lower spacer ring A208.
The lower bridge plug 3 comprises a mandrel B311, an axial hollow channel is arranged on the inner side of the mandrel B311, the upper end of the mandrel B311 is connected with a lower coupling piece 301 coupled with the upper coupling piece 211, the mandrel B311 below the lower coupling piece 301 is sequentially sleeved with an upper slip B302, an upper vertebral body B303, a sealing assembly B304, a lower vertebral body B305, a lower slip B306 and a lower spacer ring B307 from top to bottom, a cutting sleeve B308 is arranged between the lower part of the mandrel B311 and the lower spacer ring B307, the upper end of the cutting sleeve B308 is divided into six fan-shaped claws, unidirectional locking teeth are processed on the inner sides of the fan-shaped claws, locking teeth meshed with the unidirectional locking teeth are processed on the outer side of the corresponding mandrel B311, the upper end of the cutting sleeve B308 abuts against the lower spacer ring B307, the cutting sleeve B308 can only move upwards relative to the mandrel B311, and therefore the lower spacer ring B307. The lower end of the cutting sleeve B308 is connected with a push ring B309 in a threaded manner, the lower end of the push ring B309 is connected with a push ring B309 in a threaded manner, the upper end of the push ring B309 is propped against the lower spacer ring B307,
sealed intubate 5 in upper strata include intubate body 501, go up intubate body 501 and adopt 304 stainless steel, go up intubate body 501 smooth surface and outside axial evenly sets up and is no less than 2 groups of sealing rubber ring groups, every group sealing rubber ring interval is about 150mm, guarantees that two sets of rubber rings and bridging plug internal surface realize sealedly all the time. In order to avoid blowout when tripping out the inner pipe string, blowout preventer 502 is installed on the lower part of the upper pipe inserting body 501. In order to facilitate the insertion of the upper bridge plug 2 into the lower end of the upper cannula body 501, the conical guide body 503 is connected with the lower end of the upper cannula body 501, the conical guide body 503 is made of soluble materials, when the lower sealed cannula 7 is inserted downwards, the lower pressure of the lower cannula centralizer enables the conical guide body 503 to be separated from the upper sealed cannula 5, the conical guide body 503 can be dissolved automatically in the well for a period of time after being separated from the upper sealed cannula 5, and the insertion and the extraction of the lower sealed cannula 7 are not influenced.
The sealed intubate 7 of lower floor include intubate body down, the intubate body adopts 304 stainless steel down, intubate body surface smoothness and outside axial evenly set up and be no less than 2 groups of sealed rubber ring groups down, every group seals rubber ring interval about 150mm, guarantees that two sets of rubber rings and bridging plug internal surface realize sealed all the time, guarantees sealed reliability.
The lower cannula centralizer comprises a main body part and a spring leaf for centralizing, wherein the maximum outer diameter of the main body part is smaller than the inner diameter of a mandrel B311 of the lower bridge plug 3; the lower cannula centralizer is intended to facilitate the correct insertion of the lower sealing cannula 7.
An interlayer special oil pipe 8 is connected between the inner oil pipe 6 and the lower layer sealing insertion pipe 7, the interlayer special oil pipe 8 is positioned on the inner side of a section where the upper layer sealing insertion pipe 5 is positioned, and the outer diameter of the interlayer special oil pipe 8 in the section is smaller than that of the inner oil pipe 6, so that a certain overflowing channel is reserved, and upper layer water injection is guaranteed.
Claims (2)
1. The utility model provides a double-barrelled instrument of dividing of drillable bridging plug, includes well head and divides a branch injection pipeline (1), its characterized in that: the pipe is characterized by further comprising an upper bridge plug (2), a lower bridge plug (3), an outer pipe column and an inner pipe column, wherein the upper bridge plug (2) and the lower bridge plug (3) are both hollow bridge plugs, the upper bridge plug (2) and the lower bridge plug (3) are seated on the inner wall of the casing pipe one above the other, the outer pipe column is hermetically inserted in the upper bridge plug (2), the inner pipe column penetrates through the outer pipe column and is hermetically inserted in the lower bridge plug (3), and an annular space is reserved between the inner pipe column and the outer pipe column; the outer pipe column comprises an outer oil pipe (4), an upper insertion pipe centralizer and an upper sealing insertion pipe (5), which are sequentially connected from top to bottom, wherein the upper sealing insertion pipe (5) is hermetically inserted in the upper bridge plug (2); the inner tubular column comprises an inner oil pipe (6), a lower-layer sealing insertion pipe (7) and a lower insertion pipe centralizer which are sequentially connected from top to bottom, wherein the lower-layer sealing insertion pipe (7) is hermetically inserted in the lower-layer bridge plug (3);
the upper bridge plug (2) comprises a mandrel A (201), an axial hollow channel is arranged on the inner side of the mandrel A (201), the mandrel A (201) is sequentially sleeved with an upper spacing ring A (202), an upper slip A (203), an upper vertebral body A (204), a sealing assembly A (205), a lower vertebral body A (206), a lower slip A (207) and a lower spacing ring A (208) from top to bottom, a cutting sleeve A (209) is arranged between the lower part of the mandrel A (201) and the lower spacing ring A (208), the upper end of the cutting sleeve A (209) is divided into six fan-shaped claws, the inner sides of the fan-shaped claws are processed with one-way locking teeth, the outer side of the corresponding mandrel A (201) is processed with locking teeth engaged with the unidirectional locking teeth, the lower end of the cutting sleeve A (209) is connected with a push ring A (210) in a threaded manner, the lower end of the push ring A (210) is in threaded connection with an upper coupling piece (211), and the upper end of the upper coupling piece (211) is abutted against the lower spacer ring A (208);
the lower bridge plug (3) comprises a mandrel B (311), an axial hollow channel is arranged on the inner side of the mandrel B (311), the upper end of the mandrel B (311) is connected with a lower coupling piece (301) coupled with an upper coupling piece (211), the mandrel B (311) below the lower coupling piece (301) is sequentially sleeved with an upper slip B (302), an upper cone B (303), a sealing assembly B (304), a lower cone B (305), a lower slip B (306) and a lower spacer ring B (307), a cutting sleeve B (308) is arranged between the lower part of the mandrel B (311) and the lower spacer ring B (307), the upper end of the cutting sleeve B (308) is divided into six fan-shaped claws, unidirectional locking teeth are processed on the inner sides of the fan-shaped claws, cutting sleeve locking teeth meshed with the unidirectional locking teeth are processed on the outer sides of the corresponding mandrel B (311), a push ring B (309) is connected with the lower end of the push ring B (309) in a threaded manner, the upper end of the push ring B (309) is propped against the lower spacing ring B (307);
the upper-layer sealing insertion pipe (5) comprises an upper insertion pipe body (501), at least 2 groups of sealing rubber ring groups are uniformly arranged on the outer side of the upper insertion pipe body (501) in the axial direction, a blowout prevention valve (502) is installed on the lower portion of the upper insertion pipe body (501), a conical guide body (503) is connected to the lower end of the upper insertion pipe body (501), and the conical guide body (503) is made of soluble materials;
the lower-layer sealing insertion pipe (7) comprises a lower insertion pipe body, and at least 2 groups of sealing rubber ring groups are axially and uniformly arranged on the outer side of the lower insertion pipe body;
the lower cannula centralizer comprises a main body part and a spring leaf for centralizing, wherein the maximum outer diameter of the main body part is smaller than the inner diameter of a mandrel B (311) of a lower bridge plug (3).
2. A drillable bridge plug dual tube dispensing tool as in claim 1 wherein: an interlayer special oil pipe (8) is connected between the inner oil pipe (6) and the lower layer sealing insertion pipe (7), the interlayer special oil pipe (8) is positioned on the inner side of a section where the upper layer sealing insertion pipe (5) is positioned, and the outer diameter of the interlayer special oil pipe (8) in the section is smaller than that of the inner oil pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020674151.6U CN212105827U (en) | 2020-04-28 | 2020-04-28 | Double-tube separate injection tool capable of drilling bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020674151.6U CN212105827U (en) | 2020-04-28 | 2020-04-28 | Double-tube separate injection tool capable of drilling bridge plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212105827U true CN212105827U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020674151.6U Withdrawn - After Issue CN212105827U (en) | 2020-04-28 | 2020-04-28 | Double-tube separate injection tool capable of drilling bridge plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212105827U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111502594A (en) * | 2020-04-28 | 2020-08-07 | 大庆兴华天义石油钻采设备制造有限公司 | Double-tube separate injection tool capable of drilling bridge plug |
-
2020
- 2020-04-28 CN CN202020674151.6U patent/CN212105827U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111502594A (en) * | 2020-04-28 | 2020-08-07 | 大庆兴华天义石油钻采设备制造有限公司 | Double-tube separate injection tool capable of drilling bridge plug |
| CN111502594B (en) * | 2020-04-28 | 2024-05-10 | 大庆兴华天义石油钻采设备制造有限公司 | Double-tube separate injection tool capable of drilling bridge plug |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20201208 Effective date of abandoning: 20240510 |