CN111119779A - Lifting tool for sheared coiled tubing and using method - Google Patents
Lifting tool for sheared coiled tubing and using method Download PDFInfo
- Publication number
- CN111119779A CN111119779A CN201911154170.4A CN201911154170A CN111119779A CN 111119779 A CN111119779 A CN 111119779A CN 201911154170 A CN201911154170 A CN 201911154170A CN 111119779 A CN111119779 A CN 111119779A
- Authority
- CN
- China
- Prior art keywords
- coiled tubing
- tool
- rolling
- rolling groove
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
Abstract
The invention provides a lifting tool for a cut continuous oil pipe and a using method thereof. The middle of the rolling groove is also connected with a limiting boss, and the rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss. The coiled tubing and the preset coiled tubing are connected together through the lifting tool, the complex and high-risk operation of lifting the coiled tubing by the crane is converted into the conventional operation of the coiled tubing when the coiled tubing is lifted out, the construction efficiency is greatly improved, and the safety risk is obviously reduced. The lifting tool adopts the design of three rolling grooves which are symmetrical up and down, the groove depth adopts the design of gradually deepening, the tensile load is equivalent to the tensile strength of the continuous oil pipe, the design is simple, and the tensile strength is high.
Description
Technical Field
The invention belongs to the technical field of tight gas field exploitation, and particularly relates to a lifting tool for a sheared coiled tubing and a using method of the lifting tool.
Background
The main principle of the speed pipe column water drainage gas production technology is that a small-diameter coiled tubing is put into a natural gas well shaft, and the coiled tubing is cut off and then hung on a gas well mouth to serve as a production pipe column. When the gas well is produced to the later stage, because the gas well energy is gradually attenuated, and the actual yield of the gas well is lower than the critical liquid carrying flow of the coiled tubing, the gas well generates liquid accumulation again, the coiled tubing in the shaft needs to be lifted out, and then other drainage gas production processes such as foam drainage, plunger gas lift and the like are carried out. Aiming at the situation, the method for lifting the coiled tubing in the coiled tubing pressured tubing lifting process adopted at present in China is that after the upper port of the coiled tubing is plugged by a plug, an outer clamp locking device is used for grasping the upper port of the coiled tubing exposed at a wellhead, a crane is used for lifting the coiled tubing to be unlocked, enough long tubing is lifted to reversely penetrate through equipment such as a blowout preventer and an injection head, and finally the coiled tubing operation machine is used for continuously lifting the tubing. At present, the coiled tubing after unfreezing and a locking tool need to be cut together so as to facilitate reverse penetration of equipment, the process is complex, only one plug is arranged inside the coiled tubing in the whole pipe lifting process, and the safety risk is high.
Disclosure of Invention
The purpose of the invention is: the lifting tool for the sheared coiled tubing and the application method are provided, the problems of lifting and releasing of the coiled tubing with the length of kilometers in a shaft and continuous pipe lifting are solved uniformly, the process is simple, the operation efficiency is high, one-step plugging of an upper port of the coiled tubing of a wellhead is added, and the safety risk is low.
The invention aims to realize the lifting tool for the cut coiled tubing by the following technical means.
The middle of the rolling groove is also connected with a limiting boss, and the rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss.
The upper rolling grooves comprise a first rolling groove, a second rolling groove and a third rolling groove from top to bottom, and the depths of the first rolling groove, the second rolling groove and the third rolling groove are all gradually deep.
The lower rolling grooves comprise a fourth rolling groove, a fifth rolling groove and a sixth rolling groove from top to bottom, and the depths of the fourth rolling groove, the fifth rolling groove and the sixth rolling groove are gradually deep.
The limiting boss, the upper rolling groove and the lower rolling groove are integrally formed.
The lower pressing piece is a nut, and a thread matched with the nut is arranged outside the mandrel.
The outer diameter of the stud head is larger than that of the sealing rubber cylinder.
A use method of a lifting tool for shearing coiled tubing comprises the following steps:
the method comprises the steps that firstly, the continuous oil pipe is in butt joint, one end of a lifting tool with a stud head is downwards inserted into the upper end head of the continuous oil pipe of a natural gas shaft until a limiting boss abuts against the port of the continuous oil pipe;
secondly, rolling the coiled tubing, namely sequentially rolling the coiled tubing to a fourth rolling groove, a fifth rolling groove and a sixth rolling groove by using a rolling tool;
thirdly, sealing the continuous oil pipe, screwing a nut, and downwards moving the nut along the mandrel to push the rolling groove to downwards move to extrude the sealing rubber cylinder until the sealing rubber cylinder expands so as to seal the space between the continuous oil pipe and the mandrel;
fourthly, butting the upper end of the lifting tool with the preset coiled tubing until the limiting boss abuts against the port of the preset coiled tubing;
fifthly, rolling the preset continuous oil pipe, and sequentially rolling the preset continuous oil pipe to a third rolling groove, a second rolling groove and a first rolling groove;
and sixthly, lifting the coiled tubing, clamping the preset coiled tubing by using an injection head on the coiled tubing machine, lifting the coiled tubing in the shaft, taking out the hanging slips, and continuously lifting the tubing by using a coiled tubing operation machine.
The invention has the beneficial effects that: the coiled tubing and the preset coiled tubing are connected together through the lifting tool, the complex and high-risk operation of lifting the coiled tubing by the crane is converted into the conventional operation of the coiled tubing when the coiled tubing is lifted out, the construction efficiency is greatly improved, and the safety risk is obviously reduced. The lifting tool adopts the design of three rolling grooves which are symmetrical up and down, the groove depth adopts the design of gradually deepening, the tensile load is equivalent to the tensile strength of the continuous oil pipe, the design is simple, and the tensile strength is high.
Drawings
FIG. 1 is a schematic view of a lifting tool;
FIG. 2 is a schematic diagram of the operation of the lift tool;
in the figure 1, a coiled tubing is preset; 2. lifting the tool; 2-1, a nut; 2-2, a first rolling groove; 2-3, a second rolling groove; 2-4, a third rolling groove; 2-5, limiting bosses; 2-6, a fourth rolling groove; 2-7, a fifth rolling groove; 2-8, mandrel; 2-9, a sixth rolling groove; 2-10, sealing the rubber cylinder; 2-11, a stud; 3. a coiled tubing.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ example 1 ]
As shown in fig. 1 and 2, the lifting tool for the sheared coiled tubing comprises mandrels 2-8, rolling grooves are sleeved outside the mandrels 2-8, sealing rubber cylinders 2-10 are sleeved on the mandrels 2-8 below the rolling grooves, pressing pieces are sleeved on the mandrels 2-8 above the rolling grooves, and stud heads 2-11 are connected to the bottom ends of the mandrels 2-8.
The lower pressing piece is a nut 2-1, and threads matched with the nut 2-1 are arranged outside the mandrel 2-8.
The outer diameter of the stud head 2-11 is larger than that of the sealing rubber cylinder 2-10.
The bottom end of the mandrel 2-8 is connected with a stud head 2-11, the outer diameter of the stud head 2-11 is longer than that of the sealing rubber cylinder 2-10, and the bottom of the sealing rubber cylinder 2-10 falls on the upper surface of the stud head 2-11, so that when the sealing rubber cylinder 2-10 is extruded, the bottom of the sealing rubber cylinder 2-10 is pressed against the upper surface of the stud head 2-11.
[ example 2 ]
As shown in fig. 1 and 2, on the basis of embodiment 1, a limiting boss 2-5 is further connected in the middle of the rolling groove, and the rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss 2-5.
The upper rolling grooves comprise a first rolling groove 2-2, a second rolling groove 2-3 and a third rolling groove 2-4 from top to bottom, and the depths of the first rolling groove 2-2, the second rolling groove 2-3 and the third rolling groove 2-4 are gradually deepened.
The lower rolling grooves comprise fourth rolling grooves 2-6, fifth rolling grooves 2-7 and sixth rolling grooves 2-9 from top to bottom, and the depths of the fourth rolling grooves 2-6, the fifth rolling grooves 2-7 and the sixth rolling grooves 2-9 are gradually deepened.
The limiting boss 2-5, the upper rolling groove and the lower rolling groove are integrally formed.
The middle of the rolling groove is also connected with a limiting boss 2-5 which protrudes outwards, and the whole rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss 2-5. And the limiting lug bosses 2-5, the upper rolling groove and the lower rolling groove are integrally formed.
The upper rolling grooves include a first rolling groove 2-2, a second rolling groove 2-3, and a third rolling groove 2-4 from the top down. The lower rolling grooves include fourth rolling grooves 2 to 6, fifth rolling grooves 2 to 7 and sixth rolling grooves 2 to 9 from the top down. The upper rolling groove and the lower rolling groove are respectively composed of three small rolling grooves, a first rolling groove 2-2, a second rolling groove 2-3, a third rolling groove 2-4, a limiting boss 2-5, a fourth rolling groove 2-6, a fifth rolling groove 2-7 and a sixth rolling groove 2-9 are integrally formed, the groove depths of the first rolling groove 2-2, the second rolling groove 2-3, the third rolling groove 2-4, the fourth rolling groove 2-6, the fifth rolling groove 2-7 and the sixth rolling groove 2-9 are gradually deep, the tensile load is equivalent to the tensile strength of the continuous oil pipe 3, the design is simple, and the tensile strength is high.
The mandrel 2-8 and the stud head 2-11 are also integrally formed.
[ example 3 ]
As shown in fig. 1 and 2, on the basis of embodiment 2, a method for using a lifting tool for shearing coiled tubing comprises the following steps:
firstly, butting with a coiled tubing 3, and inserting one end of a lifting tool 2 with a stud head 2-11 downwards into the upper end of the coiled tubing 3 of a natural gas shaft until a limiting boss 2-5 props against the port of the coiled tubing 3; the end of the lifting tool 2 with the stud heads 2-11 is lowered down into the wellbore until the stop ledges 2-5 abut the end of the coiled tubing 3 below the lifting tool 2 which should be lifted.
Secondly, rolling the coiled tubing 3, and sequentially rolling the coiled tubing 3 to fourth rolling grooves 2-6, fifth rolling grooves 2-7 and sixth rolling grooves 2-9 by using a rolling tool; the uplifting tool 2 and the coiled tubing 3 are coupled together by rolling the upper end of the coiled tubing 3 onto the fourth rolling grooves 2-6, the fifth rolling grooves 2-7 and the sixth rolling grooves 2-9 of the uplifting tool 2 by the rolling tool in order from top to bottom.
Thirdly, sealing the continuous oil pipe, screwing the nut 2-1, and downwards moving the nut 2-1 along the mandrel 2-8 to push the rolling groove to downwards move to extrude the sealing rubber cylinder 2-10 until the sealing rubber cylinder 2-10 expands to seal the space between the continuous oil pipe 3 and the mandrel 2-8; and screwing the nut 2-1, enabling the nut 2-1 to move downwards along the thread outside the mandrel 2-8, enabling the nut 2-1 to push the rolling groove to move downwards along the mandrel 2-8, enabling the sealing rubber cylinder 2-10 to be extruded at the lowest end of the rolling groove, enabling the sealing rubber cylinder 2-10 between the rolling groove and the bolt head 2-11 to be extruded and expanded, enabling the outer wall to be attached to the inner wall of the continuous oil pipe 3, enabling the inner wall to be attached to the mandrel 2-8, and achieving secondary sealing of the continuous oil pipe 3.
Fourthly, butting the upper end of the lifting tool 2 with the preset continuous oil pipe 1, and inserting the upper end of the lifting tool into the preset continuous oil pipe 1 until the limiting boss 2-5 abuts against the port of the preset continuous oil pipe 1; and inserting the upper end of the oil lifting pipe 2 into a preset coiled oil pipe 1 on the coiled oil pipe operation machine until the limiting boss 2-5 abuts against the port of the preset coiled oil pipe 1.
Fifthly, rolling the preset continuous oil pipe 1, and sequentially rolling the preset continuous oil pipe 1 to a third rolling groove 2-4, a second rolling groove 2-3 and a first rolling groove 2-2; and sequentially rolling the preset continuous oil pipe 1 to a third rolling groove 2-4, a second rolling groove 2-3 and a first rolling groove 2-2 of the lifting tool 2 by using a rolling tool from bottom to top.
And sixthly, lifting the coiled tubing 3 out, clamping the preset coiled tubing 1 by using an injection head on the coiled tubing machine, lifting the coiled tubing 3 in the shaft, taking out the hanging slips, and continuously lifting the tubing by using a coiled tubing operation machine. And (3) lifting the coiled tubing 3 in the shaft by utilizing the preset coiled tubing 1 clamped by the injection head on the coiled tubing machine, taking out the suspension slip, and continuously lifting the tubing by adopting a coiled tubing operation machine.
The whole process adopts the traditional process, the coiled tubing operation machine is used for driving the in-pipe plug into the coiled tubing in the shaft, after the coiled tubing is plugged, the lifting tool 2 is used for connecting the upper port of the coiled tubing 3 in the barrel with the lower port of the pre-set coiled tubing 1 on the roller of the coiled tubing operation machine, the injection head of the coiled tubing operation machine is used for clamping the pre-set coiled tubing 1 on the roller to lift the plug, after the slip suspending the coiled tubing 3 is taken out, the injection head is continuously used for automatically drawing the coiled tubing lifted out from the shaft to pass through the blowout preventer, the injection head and other equipment, so that the coiled tubing is lifted up and the plug is lifted out of the roller, and the problems that the coiled tubing in the shaft is lifted up and the plug is wound back. By adopting the method and the device, the complex and high-risk operation of lifting the continuous oil pipe by the crane is converted into the conventional operation of the continuous oil pipe, the construction efficiency is greatly improved, and the safety risk is obviously reduced. The lifting tool adopts the design of three rolling grooves which are symmetrical up and down, the groove depth adopts the design of gradually deepening, the tensile load is equivalent to the tensile strength of the continuous oil pipe, the design is simple, and the tensile strength is high.
Claims (8)
1. A tool for lifting sheared coiled tubing, comprising: the sealing device comprises a mandrel (2-8), a rolling groove is sleeved outside the mandrel (2-8), a sealing rubber cylinder (2-10) is sleeved on the mandrel (2-8) below the rolling groove, a lower pressing piece is sleeved on the mandrel (2-8) above the rolling groove, and the bottom end of the mandrel (2-8) is connected with a stud head (2-11).
2. The tool of claim 1 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the middle of the rolling groove is also connected with a limiting boss (2-5), and the rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss (2-5).
3. The tool of claim 2 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the upper rolling grooves comprise a first rolling groove (2-2), a second rolling groove (2-3) and a third rolling groove (2-4) from top to bottom, and the groove depths of the first rolling groove (2-2), the second rolling groove (2-3) and the third rolling groove (2-4) are gradually deep.
4. The tool of claim 2 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the lower rolling grooves comprise fourth rolling grooves (2-6), fifth rolling grooves (2-7) and sixth rolling grooves (2-9) from top to bottom, and the groove depths of the fourth rolling grooves (2-6), the fifth rolling grooves (2-7) and the sixth rolling grooves (2-9) are gradually deepened.
5. The tool of claim 2 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the limiting boss (2-5), the upper rolling groove and the lower rolling groove are integrally formed.
6. The tool of claim 1 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the lower pressing piece is a nut (2-1), and threads matched with the nut (2-1) are arranged outside the mandrel (2-8).
7. The tool of claim 1 wherein the tool is adapted to lift sheared coiled tubing, the tool comprising: the outer diameter of the stud head (2-11) is larger than that of the sealing rubber cylinder (2-10).
8. The use method of the lifting tool for shearing the coiled tubing is characterized by comprising the following steps:
firstly, butting with a coiled tubing (3), inserting one end of a lifting tool (2) with a stud head (2-11) downwards into the upper end of the coiled tubing (3) of a natural gas shaft until a limiting boss (2-5) props against the port of the coiled tubing (3);
secondly, rolling the coiled tubing (3), and sequentially rolling the coiled tubing (3) to a fourth rolling groove (2-6), a fifth rolling groove (2-7) and a sixth rolling groove (2-9) by using a rolling tool;
thirdly, sealing the continuous oil pipe, screwing the nut (2-1), and downwards moving the nut (2-1) along the mandrel (2-8) to push the rolling groove to downwards move to extrude the sealing rubber cylinder (2-10) until the sealing rubber cylinder (2-10) expands to seal the space between the continuous oil pipe (3) and the mandrel (2-8);
fourthly, butting the upper end of the lifting tool (2) with the preset continuous oil pipe (1) until the limiting boss (2-5) abuts against the port of the preset continuous oil pipe (1);
fifthly, rolling the preset coiled tubing (1), and sequentially rolling the preset coiled tubing (1) to a third rolling groove (2-4), a second rolling groove (2-3) and a first rolling groove (2-2);
and sixthly, lifting the coiled tubing (3), clamping the preset coiled tubing (1) by using an injection head on the coiled tubing machine, lifting the coiled tubing (3) in the shaft, taking out the hanging slips, and continuously lifting the tubing by using a coiled tubing operation machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154170.4A CN111119779A (en) | 2019-11-22 | 2019-11-22 | Lifting tool for sheared coiled tubing and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154170.4A CN111119779A (en) | 2019-11-22 | 2019-11-22 | Lifting tool for sheared coiled tubing and using method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111119779A true CN111119779A (en) | 2020-05-08 |
Family
ID=70496480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911154170.4A Pending CN111119779A (en) | 2019-11-22 | 2019-11-22 | Lifting tool for sheared coiled tubing and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111119779A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100096848A1 (en) * | 2005-06-30 | 2010-04-22 | Mckee L Michael | Coiled Tubing Dimple Connection |
| CN203050545U (en) * | 2012-12-03 | 2013-07-10 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Anti-torque coiled tubing annular pressure connector |
| CN204024508U (en) * | 2014-07-28 | 2014-12-17 | 克拉玛依市红都有限责任公司 | Oil pipe connects exempts from butt joint |
| US20150060087A1 (en) * | 2013-08-27 | 2015-03-05 | Thru Tubing Solutions, Inc. | Connection apparatus for coiled tubing and method of attaching same |
| CN206554814U (en) * | 2016-12-30 | 2017-10-13 | 中国石油天然气股份有限公司 | A kind of rolling torsion-resistant female connector for coiled tubing |
| CN207436994U (en) * | 2017-10-24 | 2018-06-01 | 中石化石油工程技术服务有限公司 | Coiled tubing quick blocking instrument |
| CN208203152U (en) * | 2018-01-15 | 2018-12-07 | 北京一龙恒业石油工程技术有限公司 | The formula that can slip out of the hand input/output port |
-
2019
- 2019-11-22 CN CN201911154170.4A patent/CN111119779A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100096848A1 (en) * | 2005-06-30 | 2010-04-22 | Mckee L Michael | Coiled Tubing Dimple Connection |
| CN203050545U (en) * | 2012-12-03 | 2013-07-10 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Anti-torque coiled tubing annular pressure connector |
| US20150060087A1 (en) * | 2013-08-27 | 2015-03-05 | Thru Tubing Solutions, Inc. | Connection apparatus for coiled tubing and method of attaching same |
| CN204024508U (en) * | 2014-07-28 | 2014-12-17 | 克拉玛依市红都有限责任公司 | Oil pipe connects exempts from butt joint |
| CN206554814U (en) * | 2016-12-30 | 2017-10-13 | 中国石油天然气股份有限公司 | A kind of rolling torsion-resistant female connector for coiled tubing |
| CN207436994U (en) * | 2017-10-24 | 2018-06-01 | 中石化石油工程技术服务有限公司 | Coiled tubing quick blocking instrument |
| CN208203152U (en) * | 2018-01-15 | 2018-12-07 | 北京一龙恒业石油工程技术有限公司 | The formula that can slip out of the hand input/output port |
Non-Patent Citations (1)
| Title |
|---|
| 赵彬彬 等: "致密苏里格气田水平井速度管柱排水采气技术研究", 《2017年全国天然气学术年会论文集 工程科技 1辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109458153B (en) | Christmas tree device suitable for permanently placing and hanging coiled tubing production | |
| CN108547589B (en) | Method for producing tubular column without killing well by electric setting recoverable hanging packer | |
| CN206299366U (en) | A kind of anti-premature setting open hole packer | |
| CN203531816U (en) | Expansion construction tool for solid expandable pipe | |
| CN113494259B (en) | Coiled tubing suspension device, coiled tubing wellhead mandrel type suspension structure and method | |
| CN202381036U (en) | Suspension type squeezing bridge plug | |
| CN210087252U (en) | Underground continuous pipe cable separation sealing adapter | |
| CN111119779A (en) | Lifting tool for sheared coiled tubing and using method | |
| CN202451097U (en) | Differential motion hydraulic pressure booster for horizontal section of horizontal well | |
| CN116816308A (en) | Oil-free pipe paraffin removal lifting device for small-bore shale oil well | |
| CN2698958Y (en) | Hydraulic expansion reinforcing device for down-hole casing patch | |
| CN108252672B (en) | Coiled tubing incision rehabilitation and repair device | |
| CN2846714Y (en) | Large through caliber tail tube suspension device | |
| CN203742506U (en) | Forcing float collar type prestressing force well cementation ground anchor assembly | |
| CN215860068U (en) | Pressure testing type casing pipe patching device | |
| CN202108452U (en) | Lifting salvage cylinder for horizontal well | |
| CN103821472A (en) | Fishing bottom plug and fishing tool combination for expansion pipe | |
| CN113585995A (en) | Soluble bridge plug capable of being automatically released and using method thereof | |
| CN104314495B (en) | A kind of coiled tubing hydraulic tubing anchor | |
| CN112127807A (en) | Spring type guide ball head for continuous pipe penetration and use method | |
| CN202706985U (en) | Hydraulic machinery integrated bridge plug | |
| CN220059491U (en) | Casing pipe connector device | |
| CN108360995B (en) | Application method of coiled tubing cut restoration and repair device | |
| CN203925379U (en) | Gas underbalance Sleeve drill completion expansion tube | |
| CN210317237U (en) | Temporary plugging device suitable for oil gas well pressure back shaft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200508 |