CN103899264B - The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device - Google Patents
The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device Download PDFInfo
- Publication number
- CN103899264B CN103899264B CN201210578869.5A CN201210578869A CN103899264B CN 103899264 B CN103899264 B CN 103899264B CN 201210578869 A CN201210578869 A CN 201210578869A CN 103899264 B CN103899264 B CN 103899264B
- Authority
- CN
- China
- Prior art keywords
- screen casing
- oil
- well
- casing top
- ground anchor
- 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.)
- Active
Links
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to the application process of a kind of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device.Device is to be set with fluid cylinder overcoat, piston, promotion base, pull bar, anchor fluke and fixed cover outside central canal；Several radial direction inlet opening is offered at central canal.The application process of device includes: the cycling switch that enters under in Oil/gas Well to include to cement the well, external packer of pipe, Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, blind plate, screen casing, the completion tubular string of guide shoe composition；Well head is suppressed, and opens the anchor fluke of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device；Upper lifting pipe string, lifting is to setting tonnage；Continue pressurization, swollen sealing tube external packer；Continue pressurization, open well cementation cycling switch, circulation well cementation；After Hou Ning terminates, lower drill bit drills blind plate, and drifting on earth, fulfils assignment.Advantages of the present invention: be used in horizontal well sieve tube well-completing process, overcomes current sieve tube completion technique cannot lift a difficult problem for special cementing.
Description
Technical field
The present invention relates to a kind of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device and methods for using them of oil and gas industry drilling completion technical field, be particularly suitable for horizontal well thermal recovery screen casing crest water flooding bricklayer's's skill.
Background technology
Heat extraction by steam injection can be effectively improved viscous crude well yield, but, because injecting the high-temperature steam of more than 300 DEG C in well, well inner sleeve elongation strain can be caused, alter well head of emerging on sleeve pipe, make the cement sheath between sleeve pipe and the borehole wall be destroyed, have a strong impact on the Production Life of oil well.In order to solve this problem, most efficient method is that the sleeve pipe to viscous crude Oil/gas Well lifts prestressing force, first makes sleeve pipe elongation cement the well again, offsets the deformation of steam injection rear sleeve.
At present the method for lifting special cementing mainly has a following two:
One, first at one section of cement of shaft bottom injection, admittedly firmly one section of sleeve pipe, then enter boil on the nape opposite the mouth lifting under upper sleeve, or use " double solidifying cement ", bottom cement setting is fast, and when taking advantage of bottom condensation top Hou Ning, lifting sleeve pipe.But said method or operation easier are big, are constructed into power low, or construction risk is big, and therefore on-the-spot application is less.
Two, solid earth anchor is used.This solid earth anchor is generally used for the foot of pipe string, with the partial function of float collar, can normally cement the well, and is that anchor fluke opens by bruising after well cementation, grappling stratum, it is achieved the purpose of lifting.The earth anchor of this structure is applied more in casing cementing well-completing process.
But sieve tube completion technique has become as the main technique of horizontal well completion at present, and as a example by Shengli Oil Field, sieve tube completion has accounted for more than the 60% of whole horizontal well completion.The problem that sieve tube completion technique is faced with viscous crude Oil/gas Well casing deformation equally, and mentioned above two kinds lift prestressed method, one is the most on the verge of being replaced, another kind of solid earth anchor is generally placed at whole pipe string foot, in well cementing process, complete grappling, but the earth anchor of this structure is not suitable for sieve tube completion technique.Therefore, in the urgent need to lifting prestressing apparatus and the lifting prestressing method of a kind of applicable heavy crude heat extraction horizontal well sieve tube well-completing process.
Summary of the invention
The problem that it is an object of the invention to exist for prior art, it is provided that a kind of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device and methods for using them, cannot lift prestressing force problem solving heavy crude heat extraction horizontal well sieve tube completion.
The technical solution adopted in the present invention
First, the technical scheme of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device is: is set with fluid cylinder overcoat 3, piston 5 outside central canal 2 the most successively, promotes base 7, pull bar 8, anchor fluke 9 and fixed cover 10；Wherein, fluid cylinder overcoat 3 and fixed cover 10 are fixed with central canal 2 and are connected；Piston 5 is placed in fluid cylinder overcoat 3 and the annular piston intracavity at central canal 2 composition, and coordinates with the formation slipper seal of annular piston chamber；On the position at piston 5 top, several radial direction inlet opening 4 is offered at central canal 2；Promote base 7 to dock or integrated connection with bottom piston 5, promote pull bar 8 hinge of base 7 and bottom；Pull bar 8 bottom and middle part hinge on anchor fluke 9；Anchor fluke 9 underneath hinges is on fixed cover 10.
The scheme of said apparatus farther includes:
Being machined with on central canal 2 and coordinate fixing limited step with piston 5, central canal 2 upper and lower side is all threaded joint.
Promote base 7 and fluid cylinder overcoat 3 when original state, radially-arranged pin 6 be connected.
Threadeding fixing between fluid cylinder overcoat 3 with central canal 2, fixed cover 10 is connected fixing by lower helmet 11 with central canal 2, fluid cylinder overcoat 3 and the end face chamfering of lower helmet 11.
Being machined with sliding rail on fixed cover 10 vertically, pull bar 8 bottom and anchor fluke 9 are arranged in sliding rail.
Next present invention also offers a kind of application process according to aforementioned Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, comprises the following steps:
(1) enter under, in Oil/gas Well to include to cement the well cycling switch 12, external packer of pipe 13, Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device 14, blind plate 15, screen casing 16, the completion tubular string of guide shoe 17 composition；
(2), well head suppress, open Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device 14 anchor fluke 9；
(3), upper lifting pipe string, lifting to set tonnage；
(4), pressurization, swollen sealing tube external packer 13 are continued；
(5), continue pressurization, open well cementation cycling switch 12, circulation well cementation；
(6), after Hou Ning terminates, lower drill bit drills blind plate, and drifting on earth, fulfils assignment.
Advantages of the present invention is mainly reflected in:
(1) can use in horizontal well sieve tube well-completing process, overcome current sieve tube completion technique cannot lift a difficult problem for special cementing.
(2) can use in the middle part of pipe string, sleeve pipe and the binding site of screen casing, it is achieved the well-completing process of top cementing of horizontal well sieve tube.
(3), after ground anchorage grappling, whole pipe string internal diameter keeps consistent, it is achieved big orifice, does not affect later stage operation.
(4) special structure design makes the inflated outer diameter of this ground anchorage greatly, meets the needs of special formation grappling.
Accompanying drawing explanation
Fig. 1 is a kind of device embodiment initial condition schematic diagram of the present invention.
Fig. 2 is that the device in Fig. 1 is at open mode schematic diagram.
Fig. 3 is the application process schematic diagram of apparatus of the present invention.
In figure: 1, top box cupling, 2, central canal, 3, fluid cylinder overcoat, 4, inlet opening, 5, piston, 7, promote base, 8, pull bar, 9, anchor fluke, 10, fixed cover, 11, lower helmet group, 12, well cementation cycling switch, 13, external packer of pipe, 14, assembly of the invention, 15, blind plate, 16, screen casing, 17, guide shoe.
Detailed description of the invention
Below in conjunction with Figure of description 1-2, assembly of the invention is described in further details.
Embodiment 1
This lifting prestressed ground anchor device, including top box cupling 1, central canal 2, fluid cylinder overcoat 3, inlet opening 4, piston 5, pin 6, promotes base 7, pull bar 8, anchor fluke 9, fixed cover 10, lower helmet 11 etc., by down tube string on top box cupling 1 and bottom screwed connection；Fluid cylinder overcoat 3 and lower helmet 11 end face chamfering, it is ensured that under enter safety；Being formed pushing mechanism by fluid cylinder overcoat 3, inlet opening 4, piston 5, liquid is entered fluid cylinder by inlet opening 4, promotes piston 5 action；Anchoring structure is collectively constituted by pull bar 8, anchor fluke 9, fixed cover 10；Piston 5 action promotes the anchoring structure collectively constituted by pull bar 8, anchor fluke 9, fixed cover 10 to realize grappling function.
During device initial condition, as it is shown in figure 1, the pushing mechanism being made up of fluid cylinder overcoat 3, inlet opening 4, piston 5 and the anchoring structure being made up of pull bar 8, anchor fluke 9, fixed cover 10 are coupled by pin 6.It is machined with limited step on central canal 2, coordinates with piston 5, it is ensured that piston 5 is fixing after putting in place, prevent from promoting stroke excess to cause grappling failure.
In the anchoring structure collectively constituted by pull bar 8, anchor fluke 9, fixed cover 10, fixed cover 10 is processed sliding rail, it is ensured that pull bar 8 the smooth action of initial condition as shown in Figure 1 can reach the open mode shown in Fig. 2.When this ground anchorage is in the open mode shown in Fig. 2, anchor fluke 9 insert into stratum, it is achieved grappling, pull bar 8 is strained anchor fluke 9, is prevented anchor fluke anchor fluke 9 from turning over de-, improves anchoring effect.
Ground anchorage central canal 2 internal diameter is exactly the interior latus rectum of whole instrument, identical with whole pipe string internal diameter, it is achieved big orifice, hollow purpose.
What above-described embodiment 1 was given is a kind of exemplary embodiments, it is also possible to make following simplification embodiment.
Embodiment 2
Well cementation completion lifting prestressed ground anchor device in Oil/gas Well screen casing top is: is set with fluid cylinder overcoat 3, piston 5 outside central canal 2 the most successively, promotes base 7, pull bar 8, anchor fluke 9 and fixed cover 10；Wherein, fluid cylinder overcoat 3 and fixed cover 10 are fixed with central canal 2 and are connected；Piston 5 is placed in fluid cylinder overcoat 3 and the annular piston intracavity at central canal 2 composition, and coordinates with the formation slipper seal of annular piston chamber；On the position at piston 5 top, several radial direction inlet opening 4 is offered at central canal 2；Promote base 7 to dock or integrated connection with bottom piston 5, promote pull bar 8 hinge of base 7 and bottom；Pull bar 8 bottom and middle part hinge on anchor fluke 9；Anchor fluke 9 underneath hinges is on fixed cover 10.
Embodiment 3
On the basis of embodiment 2, the scheme of said apparatus farther includes:
Being machined with on central canal 2 and coordinate fixing limited step with piston 5, central canal 2 upper and lower side is all threaded joint.
Embodiment 4
On the basis of embodiment 3 or 2, the scheme of said apparatus farther includes:
Promote base 7 and fluid cylinder overcoat 3 when original state, radially-arranged pin 6 be connected.
Embodiment 5
On the basis of embodiment 4, the scheme of said apparatus farther includes:
Threadeding fixing between fluid cylinder overcoat 3 with central canal 2, fixed cover 10 is connected fixing by lower helmet 11 with central canal 2, fluid cylinder overcoat 3 and the end face chamfering of lower helmet 11.
In conjunction with Figure of description 3, the application process of the present invention enforcement step in operation process is described:
Embodiment 6
Specifically include:
(1) entered completion tubular string put in place as under design, including well cementation cycling switch 12, external packer of pipe 13, the hollow earth anchor of big orifice 14, blind plate 15, screen casing 16, guide shoe 17；
(2) well head is suppressed to setting pressure, opens lifting prestressed ground anchor device 14；
(3) upper lifting pipe string, lifting is to setting tonnage；
(4) pressurization, swollen sealing tube external packer 13 are continued；
(5) continue pressurization, open well cementation cycling switch 12, circulation, well cementation；
(6), after Hou Ning terminates, lower drill bit drills blind plate, and drifting on earth, fulfils assignment.
The Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchors device and method of the present invention uses in the middle part of pipe string, and after lifting special cementing operation, in whole completion tubular string, latus rectum keeps consistent, does not affect later stage operation.
Claims (5)
1. the application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, it is characterized in that: described Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, be included in outside suit fluid cylinder overcoat [3] the most successively of central canal [2], piston [5], promote base [7], pull bar [8], anchor fluke [9] and fixed cover [10]；Wherein, fluid cylinder overcoat [3] and fixed cover [10] are fixed with central canal [2] and are connected；Piston [5] is placed in fluid cylinder overcoat [3] and the annular piston intracavity formed at central canal [2], and coordinates with the formation slipper seal of annular piston chamber；On the position at piston [5] top, several radial direction inlet opening [4] is offered at central canal [2]；Promote base [7] to dock or integrated connection with piston [5] bottom, promote pull bar [8] hinge of base [7] and bottom；Pull bar [8] bottom and anchor fluke [9] upper middle part hinge；Anchor fluke [9] underneath hinges is on fixed cover [10]；Application process comprises the following steps:
Enter to include the completion tubular string that well cementation cycling switch [12], external packer of pipe [13], Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device [14], blind plate [15], screen casing [16], guide shoe [17] form under in Oil/gas Well；
Well head is suppressed, and opens the anchor fluke [9] at Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device [14]；
Upper lifting pipe string, lifting is to setting tonnage；
Continue pressurization, swollen sealing tube external packer [13]；
Continue pressurization, open well cementation cycling switch [12], circulation well cementation；
After Hou Ning terminates, lower drill bit drills blind plate, and drifting on earth, fulfils assignment.
The application process of Oil/gas Well screen casing top the most according to claim 1 well cementation completion lifting prestressed ground anchor device, it is characterized in that: being machined with on the central canal [2] in described Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device and coordinate fixing limited step with piston [5], central canal [2] upper and lower side is all threaded joint.
The application process of Oil/gas Well screen casing top the most according to claim 2 well cementation completion lifting prestressed ground anchor device, it is characterized in that: the promotion base [7] in described Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, is connected by radially-arranged pin [6] when original state with fluid cylinder overcoat [3].
4. according to the application process of the Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device described in Claims 2 or 3, it is characterized in that: threaded fixing between fluid cylinder overcoat [3] and the central canal [2] in described Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, fixed cover [10] is connected fixing by lower helmet [11] with central canal [2], fluid cylinder overcoat [3] and the end face chamfering of lower helmet [11].
The application process of Oil/gas Well screen casing top the most according to claim 4 well cementation completion lifting prestressed ground anchor device, it is characterized in that: being machined with sliding rail vertically on the fixed cover [10] in described Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device, pull bar [8] bottom and anchor fluke [9] are arranged in sliding rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210578869.5A CN103899264B (en) | 2012-12-28 | 2012-12-28 | The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210578869.5A CN103899264B (en) | 2012-12-28 | 2012-12-28 | The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103899264A CN103899264A (en) | 2014-07-02 |
| CN103899264B true CN103899264B (en) | 2016-08-10 |
Family
ID=50990811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210578869.5A Active CN103899264B (en) | 2012-12-28 | 2012-12-28 | The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103899264B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269228A (en) * | 2016-04-07 | 2017-10-20 | 中国石油化工股份有限公司 | The complete safe completion tubular column of well section prestressing force of horizontal well thermal recovery and method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2995767B1 (en) * | 2014-09-09 | 2020-03-25 | Flodim, SARL | Electrochemical well pipe cutting instrument |
| CN105178856B (en) * | 2015-07-14 | 2017-06-13 | 中国石油天然气集团公司 | Oil/gas Well finder |
| CN109989725A (en) * | 2017-12-29 | 2019-07-09 | 中石化石油工程技术服务有限公司 | Exempt from brill formula blind plate and exempts to bore plug well shaft fixing technology |
| CN108894742B (en) * | 2018-07-02 | 2021-11-09 | 中煤科工集团西安研究院有限公司 | Coal bed gas reservoir parameter measuring method and packer fixing tool |
| CN110552658A (en) * | 2019-09-26 | 2019-12-10 | 西南石油大学 | Large-drift-diameter prestressed well cementation tool |
| CN113513262B (en) * | 2021-07-28 | 2024-01-26 | 山西蓝焰煤层气工程研究有限责任公司 | Horizontal well drilling horizontal section stratum collapse treatment tool and method |
| CN115893175B (en) * | 2023-01-09 | 2023-06-16 | 中铁城建集团第一工程有限公司 | Synchronous integral lifting system for hyperboloid overhanging steel net frame and construction method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289876A (en) * | 1992-07-28 | 1994-03-01 | Natural Reserves Group, Inc. | Completing wells in incompetent formations |
| RU2171359C1 (en) * | 2000-03-17 | 2001-07-27 | Открытое Акционерное Общество Акционерная нефтяная компания "Башнефть" | Method of horizontal well completion |
| CN2744826Y (en) * | 2004-10-21 | 2005-12-07 | 辽河石油勘探局 | Thermal recovery horizontal well casing prestress completion device |
| CN201045290Y (en) * | 2007-03-09 | 2008-04-09 | 李文才 | Large hollow stem oil pumping system |
| CN202117661U (en) * | 2011-06-03 | 2012-01-18 | 中国石油天然气股份有限公司 | Self-locking type stratum testing artificial pipe string |
| CN202273619U (en) * | 2011-10-29 | 2012-06-13 | 中国石油集团西部钻探工程有限公司 | Drilling-type prestress well cementation ground anchor |
| CN202338313U (en) * | 2011-11-30 | 2012-07-18 | 山东成林高新技术产业有限公司 | Full hole equal-diameter prestressed well completion tool |
| CN203081367U (en) * | 2012-12-28 | 2013-07-24 | 中国石油化工股份有限公司 | Large drift diameter hollow ground anchor for oil and gas well cementation and completion practice |
-
2012
- 2012-12-28 CN CN201210578869.5A patent/CN103899264B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289876A (en) * | 1992-07-28 | 1994-03-01 | Natural Reserves Group, Inc. | Completing wells in incompetent formations |
| RU2171359C1 (en) * | 2000-03-17 | 2001-07-27 | Открытое Акционерное Общество Акционерная нефтяная компания "Башнефть" | Method of horizontal well completion |
| CN2744826Y (en) * | 2004-10-21 | 2005-12-07 | 辽河石油勘探局 | Thermal recovery horizontal well casing prestress completion device |
| CN201045290Y (en) * | 2007-03-09 | 2008-04-09 | 李文才 | Large hollow stem oil pumping system |
| CN202117661U (en) * | 2011-06-03 | 2012-01-18 | 中国石油天然气股份有限公司 | Self-locking type stratum testing artificial pipe string |
| CN202273619U (en) * | 2011-10-29 | 2012-06-13 | 中国石油集团西部钻探工程有限公司 | Drilling-type prestress well cementation ground anchor |
| CN202338313U (en) * | 2011-11-30 | 2012-07-18 | 山东成林高新技术产业有限公司 | Full hole equal-diameter prestressed well completion tool |
| CN203081367U (en) * | 2012-12-28 | 2013-07-24 | 中国石油化工股份有限公司 | Large drift diameter hollow ground anchor for oil and gas well cementation and completion practice |
Non-Patent Citations (4)
| Title |
|---|
| 基础固井地锚提拉套管预应力技术;李葆青等;《石油钻采工艺》;19900430;第23-24页 * |
| 套管双级地锚在稠油热采井中的应用;施连海等;《石油机械》;20101031;第38卷(第10期);第61-62页 * |
| 组合式套管预应力地锚工具的研制与应用;牟忠信等;《石油机械》;20050228;第33卷(第2期);第44-45页 * |
| 预应力固井用弹簧式水力促动底部循环地锚;肖武锋等;《石油机械》;20070330;第35卷(第3期);第36-38页 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269228A (en) * | 2016-04-07 | 2017-10-20 | 中国石油化工股份有限公司 | The complete safe completion tubular column of well section prestressing force of horizontal well thermal recovery and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103899264A (en) | 2014-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103899264B (en) | The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device | |
| CN106639971B (en) | A kind of high pressure-bearing method for blocking of perforation holes | |
| CN103321622A (en) | Sand draining and oil extracting method in manner of integrating injection and extraction for thermal producing well and device thereof | |
| CN206693997U (en) | A kind of oil field is every excavating technology tubing string | |
| CN106437605B (en) | A kind of packer | |
| CN112012667A (en) | Oil testing and well completion integrated pipe string combined with fine pressure control technology | |
| CN101307679B (en) | Thin interlayer steam injection thermal production well mixing-proof well completion process | |
| CN102926774A (en) | Bolting and grouting process for governing roadway floor heave | |
| CN207296937U (en) | High-pressure oil-gas well hydraulic oil pipe anchoring device | |
| CN208122836U (en) | A kind of High Pressure Water Injection String | |
| CN203081367U (en) | Large drift diameter hollow ground anchor for oil and gas well cementation and completion practice | |
| CN106761577A (en) | A kind of oil field is every excavating technology tubing string | |
| CN103775022A (en) | Multifunctional packer capable of resealing under lower pressure after sealing under high pressure for the first time | |
| CN201031679Y (en) | Deep layer gas well multiple fracturing tools string | |
| CN107542418A (en) | High-pressure oil-gas well hydraulic oil pipe anchoring device and its method of work | |
| CN204920894U (en) | A open hole well packer for acidizing fracturing | |
| CN205936473U (en) | Full latus rectum prestressed ground anchors that can reset | |
| CN109899047B (en) | Tieback fracturing method and anchoring retrievable tieback fracturing shaft | |
| WO2016008339A1 (en) | Drill-free stage collar of through-bottom type | |
| CN202338290U (en) | Gas lifting and completion Integrated tubular column with dual packers | |
| CN111058792A (en) | Coiled tubing perforation-free under-pressure operation-free well completion device and method | |
| CN205577845U (en) | Float pipe tool that traps from crushing -type | |
| CN206158637U (en) | Well cementation earth anchor device | |
| CN112065296B (en) | Well completion operation method combining fine pressure control technology | |
| CN114607343B (en) | Acid fracturing integrated tubular column and acid fracturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Sun Ronghua Inventor after: Feng Dejie Inventor after: Zhang Jianguo Inventor after: Li Guofeng Inventor after: Peng Zhigang Inventor after: Yu Jinling Inventor after: Guo Xinjun Inventor after: Ren Yongguang Inventor after: Li Wencai Inventor after: Tang Ming Inventor after: Ma Mingxin Inventor after: Zhou Guangqing Inventor after: Yang Qizhen Inventor after: Xu Xin Inventor after: Yang Haibo Inventor after: Shang Yingxin Inventor after: Liu Zhonghai Inventor after: Wang Jiaxin Inventor after: Wang Aimin Inventor before: Peng Zhigang Inventor before: Li Guofeng Inventor before: Xu Chanchan Inventor before: Zhang Lei Inventor before: Zou Xiaomin Inventor before: Yu Jinling Inventor before: Xu Xin Inventor before: Li Jinfeng Inventor before: Zhang Jianguo Inventor before: Guo Xinjun Inventor before: Ren Yongguang Inventor before: Ma Mingxin Inventor before: Wei Xinfang |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |