CN110700784A - Electric control downhole pipe cutting tool - Google Patents
Electric control downhole pipe cutting tool Download PDFInfo
- Publication number
- CN110700784A CN110700784A CN201911002135.0A CN201911002135A CN110700784A CN 110700784 A CN110700784 A CN 110700784A CN 201911002135 A CN201911002135 A CN 201911002135A CN 110700784 A CN110700784 A CN 110700784A
- Authority
- CN
- China
- Prior art keywords
- piston
- hydraulic
- cutting knife
- cutting
- hydraulic cylinder
- 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
- 238000005520 cutting process Methods 0.000 title claims abstract description 72
- 238000009434 installation Methods 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 210000004907 gland Anatomy 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 239000002360 explosive Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000013043 chemical agent Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of oil field drilling and workover stuck drill accident treatment, in particular to an electric control downhole pipe tool cutting tool. The device includes motor, reduction gear, hydraulic pump and lower motor, goes up the motor and is connected with the reduction gear, and the axis of rotation of reduction gear is connected with the shaft coupling, and the shaft coupling lower extreme is connected with the hydraulic cylinder body, and the cutting knife installation body is connected to hydraulic cylinder body lower extreme, and center pole upper end is the boss in the piston, and center pole center is equipped with central runner in the piston, and center pole upper end boss is arranged in the hydraulic cylinder body and is worked with hydraulic cylinder body phase-match. The invention realizes that the cutting power comes from the electric power of the cable, has stable power source, meets the cutting requirements of various steel-grade pipes, can efficiently and safely cut drill rods, oil pipes or sleeves, has low construction cost, does not need dangerous and highly-polluted articles such as explosive, chemical agents and the like, meets the environmental protection requirements, and has high cutting speed and high efficiency.
Description
The technical field is as follows:
the invention relates to the technical field of oil field drilling and workover stuck drill accident treatment, in particular to an electric control downhole pipe tool cutting tool.
Background art:
along with the continuous deepening of oil field development, horizontal wells and wells with complex structures are increased day by day, drilling sticking accidents frequently occur during drilling, and after the sticking can not be released through conventional treatment, the sticking is usually released through explosion loosening and explosion cutting. However, as the safety and environmental protection control of the current country is becoming stricter, the approval and allocation processes of detonators and explosives are complicated, the period is long, and even in regions such as Xinjiang, the transportation of dangerous goods such as explosives is strictly forbidden, which seriously affects the field accident handling progress and causes the stop-waiting cost to be increased, so that a new measure is urgently needed to solve the problem.
A small-diameter in-pipe hydraulic cutter is developed by the research institute in China and used for solving the problem of underground oil pipe cutting. But needs the matching construction of coiled tubing, and the cost is higher. The working pressure provided by the drilling fluid is not stable enough, and if large pressure fluctuation exists, the blade in work is broken off. Can only be used for cutting oil pipes, and is not suitable for drill pipes and the like. Therefore, the hydraulic cutter is not enough to solve the current difficult problem of well drilling and repairing jam release.
The invention content is as follows:
the invention aims to solve the technical problem of providing an electric control downhole pipe cutting tool, which realizes that cutting power comes from electric power of a cable, has stable power source, meets the cutting requirements of various steel-grade pipes, can efficiently and safely cut drill rods, oil pipes or sleeves, has low construction cost, does not need dangerous and highly-polluted articles such as explosive, chemical agents and the like, meets the environmental protection requirements, has high cutting speed and high efficiency, reduces the accident risk because the cutting rule of the tool is favorable for the subsequent work, shortens the accident handling period, has small operation risk, and can greatly reduce the time and cost of logistics guarantee such as storage, transportation and the like. The defects that the existing hydraulic cutter in the pipe has high construction cost and unstable cutting power, and can break the blade and cannot cut the drill rod are overcome.
The technical scheme adopted by the invention is as follows: an electric control downhole pipe cutting tool comprises an upper motor, a speed reducer, a hydraulic pump and a lower motor, wherein the upper motor is connected with the speed reducer, a rotating shaft of the speed reducer is connected with a coupler, the lower end of the coupler is connected with a hydraulic cylinder body, the lower end of the hydraulic cylinder body is connected with a cutting knife installation body, the upper end of a piston center rod is provided with a boss, a center flow channel is arranged in the center of the piston center rod, the boss at the upper end of the piston center rod is arranged in the hydraulic cylinder body and works in a manner matched with the hydraulic cylinder body, a reset spring is arranged between the lower end face of the boss at the piston center rod and the inner bottom end face of the hydraulic;
the upper pin of the cutting knife installation body is connected with a cutting knife, the inner side of the cutting knife is provided with a rotating cam body, the rotating cam body extends into a side wall groove of the piston central rod, the groove wall of the piston central rod pushes the rotating cam body to enable the cutting knife to extend out of the cutting knife installation body in a rotating mode when the piston central rod moves downwards, the groove wall of the piston central rod pushes the rotating cam body to enable the cutting knife to rotate and retract to the cutting knife installation body when the piston central rod moves upwards, the lower end of the cutting knife installation body is connected with a limiting block, and the limiting block limits;
the center of the adapter is provided with a central channel communicated with a central flow passage of the piston center rod, the lower end of the piston center rod is connected with the inner wall of the upper end of the adapter in a sliding and sealing manner, the lower end of the adapter is sleeved with a bearing gland, the lower end of the bearing gland is connected with a hydraulic anchor shell, a thrust bearing is arranged between the lower end of the bearing gland and a boss on the outer wall of the adapter, a deep groove ball bearing is arranged between the hydraulic anchor shell and the adapter, a hydraulic anchor is arranged in the hydraulic anchor shell, an overflowing inner cylinder is arranged at the center of the hydraulic anchor, the side wall of the overflowing inner cylinder is provided with an overflowing hole channel leading to the hydraulic anchor, the central channel of the overflowing inner cylinder is communicated with the central channel of the adapter, the lower end of the overflowing inner cylinder.
And a copper bearing is arranged between the coupler and the shell of the speed reducer.
The cutting knife is made of hard alloy.
The lower end of the piston center rod is connected with the inner wall of the upper end of the adapter through a spline.
The invention has the beneficial effects that: the invention realizes that the cutting power comes from the electric power of the cable, the power source is stable, the cutting requirements of various steel-grade pipes are met, the cutting operation can be efficiently and safely carried out on the drill rod, the oil pipe or the casing pipe, the construction cost is low, no dangerous and high-pollution articles such as explosive, chemical agents and the like are needed, the environmental protection requirements are met, the cutting speed is high, the efficiency is high, the cutting rule is favorable for the subsequent work, the accident risk is reduced, the accident handling period is shortened, the operation risk is small, and the time and the cost of the logistics support such as storage, transportation and the like can be greatly reduced.
Description of the drawings:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic view showing a state where the cutter is not extended.
Fig. 4 is a schematic view showing a state in which the cutter is extended by rotation.
The specific implementation mode is as follows:
as shown in figure 2, an electric control downhole pipe cutting tool comprises an upper motor 4-1, a speed reducer 4-2, a hydraulic pump 4-15 and a lower motor 4-16, wherein the upper motor 4-1 is connected with the speed reducer 4-2, a rotating shaft of the speed reducer 4-2 is connected with a coupling 4-3, the lower end of the coupling 4-3 is connected with a hydraulic cylinder body 4-17, the lower end of the hydraulic cylinder body 4-17 is connected with a cutting knife installation body 4-18, the upper end of a piston center rod 4-5 is provided with a boss, the center of the piston center rod 4-5 is provided with a center flow passage, the boss at the upper end of the piston center rod 4-5 is arranged in the hydraulic cylinder body 4-17 and matched with the hydraulic cylinder body 4-17 for working, a return spring 4-6 is arranged between the lower end face of the boss of the piston center rod, the lower end of a piston center rod 4-5 sequentially penetrates through a hydraulic cylinder body 4-17 and a cutting knife installation body 4-18 and then penetrates into an adapter 4-19;
the cutting knife installation body 4-18 is connected with a cutting knife 4-7 through a pin, a rotating cam body is designed on the inner side of the cutting knife 4-7 and extends into a groove on the side wall of a piston central rod 4-5, the groove wall of the piston central rod 4-5 pushes the rotating cam body to enable the cutting knife 4-7 to rotatably extend out of the cutting knife installation body 4-18 when the piston central rod 4-5 moves downwards, the groove wall of the piston central rod 4-5 pushes the rotating cam body to enable the cutting knife 4-7 to rotatably retract into the cutting knife installation body 4-18 when the piston central rod 4-5 moves upwards, the lower end of the cutting knife installation body 4-18 is connected with a limiting block 4-8, and the limiting block 4-8 limits the cutting knife 4-7 when the cutting knife 4-7;
a central channel communicated with a central flow passage of a piston central rod 4-5 is arranged in the center of the conversion joint 4-19, the lower end of the piston central rod 4-5 is connected with the inner wall of the upper end of the conversion joint 4-19 in a sliding and sealing way, a bearing gland 4-9 is sleeved at the lower end of the conversion joint 4-19, the lower end of the bearing gland 4-9 is connected with a hydraulic anchor shell 4-20, a thrust bearing 4-10 is arranged between the lower end of the bearing gland 4-9 and a boss on the outer wall of the conversion joint 4-19, a deep groove ball bearing 4-11 is arranged between the hydraulic anchor shell 4-20 and the conversion joint 4-19, a hydraulic anchor 4-13 is arranged in the hydraulic anchor shell 4-20, an overflowing inner cylinder 4-12 is arranged in the center of the hydraulic anchor 4-13, an overflowing hole passage leading to the hydraulic anchor 4-, the central channel of the overflowing inner cylinder 4-12 is communicated with the central channel of the conversion joint 4-19, the lower end of the overflowing inner cylinder 4-12 is connected with the hydraulic joint 4-14, the lower end of the hydraulic joint 4-14 is connected with the hydraulic pump 4-15, the hydraulic pump 4-15 is connected with the oil tank, and the lower end of the hydraulic pump 4-15 is connected with the lower motor 4-16.
A copper bearing 4-4 is arranged between the coupler 4-3 and the outer shell of the reducer 4-2.
The cutters 4-7 adopt hard alloy cutters.
The lower end of the piston center rod 4-5 is connected with the inner wall of the upper end of the conversion joint 4-19 through a spline.
As shown in fig. 1, when in use, the workover rig 1 and the logging winch 2 are used for lowering the electrically controlled downhole pipe cutting tool 4 into the well to a target depth through the cable 3, and cutting of the downhole pipe string is completed at a preset position.
When the pipe cutting is carried out, the upper motor 4-1 is decelerated by the reducer 4-2, and power for rotary cutting is provided by the coupler 4-3; the lower motor 4-16 drives the hydraulic pump 4-15 to pump high-pressure hydraulic oil, and the cutting tool is anchored through the hydraulic anchor 4-13. Meanwhile, the piston central rod 4-5 moves downwards under the push of high-pressure hydraulic oil provided by the hydraulic pump 4-15, the piston central rod 4-5 moves downwards to push the cutting knife 4-7 to rotate and extend, as shown in figure 4, the knife head is propped against the inner wall of the pipe to be cut, after cutting, the hydraulic pump 4-15 releases pressure, the piston central rod 4-5 moves upwards under the push of the return spring 4-6, the cutting knife 4-7 is retracted, as shown in figure 3, the hydraulic anchor 4-13 is unlocked accordingly, and the cable is lifted and taken out of the electric control downhole pipe cutting tool.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (4)
1. An automatically controlled downhole pipe utensil cutting means which characterized in that: the hydraulic cylinder comprises an upper motor (4-1), a speed reducer (4-2), a hydraulic pump (4-15) and a lower motor (4-16), wherein the upper motor (4-1) is connected with the speed reducer (4-2), a rotating shaft of the speed reducer (4-2) is connected with a coupling (4-3), the lower end of the coupling (4-3) is connected with a hydraulic cylinder body (4-17), the lower end of the hydraulic cylinder body (4-17) is connected with a cutting knife installation body (4-18), the upper end of a piston center rod (4-5) is provided with a boss, a center flow channel is arranged in the center of the piston center rod (4-5), the boss at the upper end of the piston center rod (4-5) is arranged in the hydraulic cylinder body (4-17) and works in a matched manner with the hydraulic cylinder body (4-17), and a reset spring (4-16) is arranged between the lower end face of the boss of the -6), the lower end of the piston center rod (4-5) sequentially penetrates through the hydraulic cylinder body (4-17) and the cutting knife installation body (4-18) and then penetrates into the adapter (4-19);
the cutting knife installation bodies (4-18) are connected with cutting knives (4-7) through pins, the inner sides of the cutting knives (4-7) are provided with rotating cam bodies, the rotary cam body extends into a groove on the side wall of the central rod (4-5) of the piston, when the central rod (4-5) of the piston moves downwards, the wall of the groove of the central rod (4-5) of the piston pushes the rotary cam body to enable the cutting knife (4-7) to rotate and extend out of the cutting knife mounting body (4-18), when the piston central rod (4-5) goes upward, the groove wall of the piston central rod (4-5) pushes the rotating cam body to make the cutting knife (4-7) rotate and retract to the cutting knife installation body (4-18), the lower end of the cutting knife installation body (4-18) is connected with a limiting block (4-8), the limiting block (4-8) limits the cutting knife (4-7) when the cutting knife (4-7) rotates and extends out;
a central channel communicated with a central flow channel of a piston central rod (4-5) is arranged in the center of the adapter (4-19), the lower end of the piston central rod (4-5) is connected with the inner wall of the upper end of the adapter (4-19) in a sliding and sealing manner, a bearing gland (4-9) is sleeved at the lower end of the adapter (4-19), a hydraulic anchor shell (4-20) is connected at the lower end of the bearing gland (4-9), a thrust bearing (4-10) is arranged between the lower end of the bearing gland (4-9) and a boss on the outer wall of the adapter (4-19), a deep groove ball bearing (4-11) is arranged between the hydraulic anchor shell (4-20) and the adapter (4-19), a hydraulic anchor (4-13) is arranged in the hydraulic anchor shell (4-20), an overflowing inner cylinder (4-12) is arranged in the center of the hydraulic anchor (4, the side wall of the overflowing inner cylinder (4-12) is provided with an overflowing pore canal leading to the hydraulic anchor (4-13), a central channel of the overflowing inner cylinder (4-12) is communicated with a central channel of the conversion joint (4-19), the lower end of the overflowing inner cylinder (4-12) is connected with the hydraulic joint (4-14), the lower end of the hydraulic joint (4-14) is connected with the hydraulic pump (4-15), the hydraulic pump (4-15) is connected with the oil tank, and the lower end of the hydraulic pump (4-15) is connected with the lower motor (4-16).
2. An electrically controlled downhole tubular cutting tool according to claim 1, wherein: and a copper bearing (4-4) is arranged between the coupler (4-3) and the outer shell of the speed reducer (4-2).
3. An electrically controlled downhole tubular cutting tool according to claim 1, wherein: the cutting knife (4-7) adopts a hard alloy cutting knife.
4. An electrically controlled downhole tubular cutting tool according to claim 1, wherein: the lower end of the piston center rod (4-5) is connected with the inner wall of the upper end of the adapter (4-19) through a spline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911002135.0A CN110700784A (en) | 2019-10-21 | 2019-10-21 | Electric control downhole pipe cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911002135.0A CN110700784A (en) | 2019-10-21 | 2019-10-21 | Electric control downhole pipe cutting tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110700784A true CN110700784A (en) | 2020-01-17 |
Family
ID=69202016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911002135.0A Pending CN110700784A (en) | 2019-10-21 | 2019-10-21 | Electric control downhole pipe cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110700784A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997554A (en) * | 2020-09-16 | 2020-11-27 | 中国海洋石油集团有限公司 | Deep well oil casing cutting tool |
| CN112943139A (en) * | 2021-02-19 | 2021-06-11 | 西安石竹能源科技有限公司 | Underground cutting instrument |
| CN113062700A (en) * | 2021-04-20 | 2021-07-02 | 渝丰科技股份有限公司 | Prefabricated cable for drilling special oil and gas well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110297379A1 (en) * | 2010-06-07 | 2011-12-08 | Baker Hughes Incorporated | Slickline Run Hydraulic Motor Driven Tubing Cutter |
| CN103562488A (en) * | 2011-05-31 | 2014-02-05 | 韦尔泰克有限公司 | Downhole tubing cutter tool |
| CN105401900A (en) * | 2015-11-19 | 2016-03-16 | 北京美高科技发展有限公司 | Cable type electrohydraulic control pipe cutting tool |
| CN105518248A (en) * | 2013-07-05 | 2016-04-20 | 布鲁斯·A.·通盖特 | Apparatus and method for cultivating a downhole surface |
| CN109653697A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | Oil pipe hydraulic cuts fishing tool |
-
2019
- 2019-10-21 CN CN201911002135.0A patent/CN110700784A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110297379A1 (en) * | 2010-06-07 | 2011-12-08 | Baker Hughes Incorporated | Slickline Run Hydraulic Motor Driven Tubing Cutter |
| CN103562488A (en) * | 2011-05-31 | 2014-02-05 | 韦尔泰克有限公司 | Downhole tubing cutter tool |
| CN105518248A (en) * | 2013-07-05 | 2016-04-20 | 布鲁斯·A.·通盖特 | Apparatus and method for cultivating a downhole surface |
| CN105401900A (en) * | 2015-11-19 | 2016-03-16 | 北京美高科技发展有限公司 | Cable type electrohydraulic control pipe cutting tool |
| CN109653697A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | Oil pipe hydraulic cuts fishing tool |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997554A (en) * | 2020-09-16 | 2020-11-27 | 中国海洋石油集团有限公司 | Deep well oil casing cutting tool |
| CN112943139A (en) * | 2021-02-19 | 2021-06-11 | 西安石竹能源科技有限公司 | Underground cutting instrument |
| CN113062700A (en) * | 2021-04-20 | 2021-07-02 | 渝丰科技股份有限公司 | Prefabricated cable for drilling special oil and gas well |
| CN113062700B (en) * | 2021-04-20 | 2024-04-02 | 渝丰科技股份有限公司 | Prefabricated cable for drilling special oil-gas well |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110700784A (en) | Electric control downhole pipe cutting tool | |
| US10724328B2 (en) | Downhole tool string for plug and abandonment by cutting | |
| US4825963A (en) | High-pressure waterjet/abrasive particle-jet coring method and apparatus | |
| WO2020034643A1 (en) | Drilling process of pressure-preserving cable core drilling machine for subsea natural gas hydrates | |
| WO2020034661A1 (en) | Sediment core-boring drilling process suitable for submarine rope core-boring drill | |
| US20170152718A1 (en) | Casing windowing method and tool using coiled tubing | |
| CN109267982A (en) | A kind of staged fracturing and control water completion method and tubing string, underground sliding bush switching system | |
| US20230059714A1 (en) | Rock-piercing flexible rock drilling robot and rock breaking method | |
| CN101126304A (en) | Waterproof casing mounting method-immersed tube drilling method | |
| CN109653697A (en) | Oil pipe hydraulic cuts fishing tool | |
| CN104847263A (en) | Coal bed methane far-end butt joint horizontal well drilling method | |
| CN113482561A (en) | Oil and gas well sealing casing recovery device and recovery method thereof | |
| CN102296950A (en) | Hydraulic shearing type sampling drilling tool | |
| CN114687696B (en) | Casing pipe external forging milling tool and method based on hydraulic jetting | |
| CN102747977A (en) | Internal cutting device of hydraulic sleeve | |
| CN202745782U (en) | Internal cutting device of hydraulic sleeve | |
| CN110130847B (en) | Cable transmission downhole gear type tapping tool | |
| US20110226474A1 (en) | Method and apparatus for cutting tubular goods | |
| CN209129577U (en) | A kind of 7 " non-rotating gravity set packers of limited times | |
| EP3085883A1 (en) | Downhole tool string for plug and abandonment by corrosive agent | |
| CN114215490B (en) | Hydraulic control remote monitoring's sleeve pipe cutterbar | |
| CN201544128U (en) | Hydraulic sand-blasting cutter | |
| CN115162992A (en) | Small-diameter pipe column cutting and fishing integrated fishing device and method | |
| CN201439694U (en) | Taking and changing sleeve cutting salvage device | |
| CN110685629B (en) | Tool for cleaning and fishing small-diameter underground rock slag in deep well section |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201020 Address after: No. 6, liupukang, Xicheng District, Beijing 100120 Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC GREATWALL DRILLING Co. Address before: 124010 Xinglongtai, Liaoning Province, oil street, No. 96, No. Applicant before: CNPC GREATWALL DRILLING Co. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200117 |