CN107100575A - Expansion tube slide block type reducing expansion tool - Google Patents
Expansion tube slide block type reducing expansion tool Download PDFInfo
- Publication number
- CN107100575A CN107100575A CN201610092473.8A CN201610092473A CN107100575A CN 107100575 A CN107100575 A CN 107100575A CN 201610092473 A CN201610092473 A CN 201610092473A CN 107100575 A CN107100575 A CN 107100575A
- Authority
- CN
- China
- Prior art keywords
- expansion
- cone
- sliding block
- plane
- conical surface
- 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
- 230000001603 reducing effect Effects 0.000 title claims abstract description 52
- 210000002445 nipple Anatomy 0.000 claims description 9
- 238000004513 sizing Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 239000007858 starting material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- E21B29/10—Reconditioning of well casings, e.g. straightening
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
A kind of expansion tube slide block type reducing expansion tool involved in the present invention, mainly include upper addendum cone, expansion sliding block and lower base cone three parts, upper addendum cone and lower base cone are through hole cone structure, expand sliding block to be located between upper addendum cone and lower base cone, be connected by the inclined-plane rib on rib groove and upper addendum cone, lower base cone；During expansion, move toward one another occurs for upper addendum cone and lower base cone, promotes expansion sliding block to occur radial displacement, reducing expansion tool is realized reducing, upper addendum cone and connecting tube top are machined with locking mechanism, limitation locking is carried out to the reducing expansion tool after closure.The present invention realizes reducing by expanding sliding block sliding block, reduction instrument closing force, realized after closure by locking mechanism spacing, ensure that expansion tube realizes unified sizing expansion, the conical surface is expanded using first and the second expansion conical surface realizes the isometrical expansion of the twin-stage of expansion tube simultaneously, hose expansion power is reduced, beneficial to site safety operation.
Description
Technical field
The present invention relates to the drilling completion technical field of tools in oil and gas industry, more particularly to a kind of expansion tube slide block type reducing expansion tool, by using the reducing of expansion tool, makes expansion tube realize reducing expansion and waits hole diameter to expand.
Background technology
In traditional oil gas field drilling operation, with the increase of well inner sleeve level, casing size reduces step by step, and borehole size also constantly reduces, and thus frequently resulting in deep-well, ultradeep well and Holes of Complicated Wells can not smoothly bore too small and influence later stage production operation up to target zone or borehole size.Expansion sleeve technology is as a kind of follow-up solution of drilling problem, and applied in well structure design and drilling plan, its expansion rate is relatively small, can not use the drilling tool progress of stock size is next to open secondary drilling after use.Belong to the world Deng hole diameter expansion sleeve technology and be drilled well field cutting edge technology, when experience bad ground is difficult to normal drilling in drilling process, to wait sleeve pipe formation temporary casing after hole diameter expansion to block behind stratum, casing programme is not changed, the technology will produce significant impact to Tail Pipe For Complicated Deep Wells drilling well.At present, international first-class hole diameter expansion sleeve technology is in research and development and experimental stage, domestic also positive to carry out key technology research.
Reducing expansion tool is one of key core technologies of hole diameter expansion sleeve technology such as realization, the instrument can be realized in underground reducing and to expansion sleeve etc. hole diameter expand operation, the reasonability of hole diameter expansion sleeve overall system structure such as determine, vital effect is played to overall technology application.Patent ZL200910143575.8 discloses a kind of expansion tube umbrella-type reducing expansion tool, patent ZL201110335730.3 discloses a kind of collapsible reducing expansion tool of expansion tube, patent 201210450506.3 discloses a kind of expansion tube combination reducing expansion cone, patent 201310542734.8 discloses a kind of expansion tube arc variable-diameter expansion device, the reducing expansion of expansion tube can be achieved in expansion tool involved by these patents in theory, but there is expansion tool during actual experiment and inconvenience is installed, the problem of closure is not exclusively and reducing clossing pressure is excessive, and occur to disengage phenomenon in the reducing expansion process after closure, be difficult to full well section expansion tube waits hole diameter expansion, and then influence etc. hole diameter bulged tube technology development, therefore, it is badly in need of the variable radial expansion tool that research meets test requirements document.
The content of the invention
The problem faced for existing expansion tube reducing expansion tool, solves the problems such as excessive reducing expansion tool closing force and easy disengagement, has invented a kind of expansion tube slide block type reducing expansion tool, possessed reducing feature, can make the hole diameter expansion such as expansion tube realization.
The expansion tube slide block type reducing expansion tool of the present invention, mainly by upper addendum cone 1, expansion sliding block 2 and the lower three parts of base cone 3, wherein：Upper addendum cone 1 and lower base cone 3 are through hole cone structure, and the upper outside of addendum cone 1 is provided with base cone inclined-plane 9 provided with the first expansion conical surface 5 and addendum cone inclined-plane 8, the lower outside of base cone 3, and the lower top of base cone 3 is provided with the connecting tube 4 being slidably matched with upper addendum cone 1；Sliding block 2 is expanded to be located between upper addendum cone 1 and lower base cone 3, the ring-type cone structure that the circumferential abutment of sliding block 2 is constituted is expanded by 3-12 blocks, expansion sliding block 2 is enclosed on outside connecting tube 4, the outside of sliding block 2 is expanded provided with the second expansion conical surface 6, the sliding block ramp 10 and sliding block lower inclined plane 11 with addendum cone inclined-plane 8 and the cooperation of base cone inclined-plane 9 are respectively equipped with inside expansion sliding block 2, addendum cone inclined-plane 8 and sliding block ramp 10, base cone inclined-plane 9 and sliding block lower inclined plane 11 are made up of the inclined-plane rib 12 and rib groove 13 on its involutory surface and spacing slide cooperation, expansion sliding block 2 passes through rib groove 13 and upper addendum cone 1, the spacing top of addendum cone 1 and the joint portion of connecting tube 4 of being slidably fitted on lower base cone 3 is provided with locking mechanism 18.
Such scheme further comprises：
Described locking mechanism 18 includes locking pipe nipple 1801, Lock spring 1802, closing piece 1803 and closing piece slot 1804, wherein, lock the bottom of pipe nipple 1801 and be provided with annular groove, Lock spring 1802, closing piece 1803 are located in annular groove, closing piece slot 1804 is located between upper addendum cone 1 and connecting tube 4, lock the lower end of pipe nipple 1801 and constitute grafting cooperation with closing piece slot 1804, and closing piece 1803 constitutes with the upper top of addendum cone 1 and stops cooperation.
The described cone angle of sliding block ramp 10 is identical with the cone angle of addendum cone inclined-plane 8, and the cone angle of sliding block lower inclined plane 11 is identical with the cone angle of base cone inclined-plane 9.
It is 6 pieces to expand the quantity of sliding block 2, and every piece of expansion sliding block 2 is 1 corresponding to addendum cone inclined-plane 8, the inclined-plane rib 12 on base cone inclined-plane 9 or rib groove 13.
The cone angle of the first described expansion conical surface 5 is 8~15 °, and the cone angle of the second expansion conical surface 6 is 9~16 °, and the cone angle of the second expansion conical surface 6 is more than the first cone angle for expanding the conical surface 5.
The first expansion expansion conical surface 6 of the conical surface 5 and second is extended with isometrical section downwards, sliding block top surface 15 and sliding block bottom surface 16 are respectively equipped with the top and bottom of expansion sliding block 2, sliding block top surface 15 and sliding block bottom surface 16 constitute spacing stop cooperation with being arranged on the upper limit plane 14 of first 5 isometrical sections of lower ends of the expansion conical surface and being arranged on the lower limit plane 17 of the lower bottom of base cone 3 respectively.
The advantage of the invention is that：The present invention realizes reducing by expanding the mutual slip between sliding block and upper addendum cone and lower base cone, effectively reduces instrument closing force；Realized by locking mechanism spacing after instrument closure completely, prevent reducing expansion tool from being disengaged in expansion operation process, it is ensured that expansion tube realizes unified sizing expansion；The conical surface being expanded using first simultaneously and the second expansion conical surface realizing the isometrical expansion of the twin-stage of expansion tube, increased hose expansion rate, reduce hose expansion power, beneficial to site safety operation, that realizes caving ground waits hole diameter closure.
Brief description of the drawings
Fig. 1 is the expansion tube slide block type reducing expansion tool schematic diagram before closure；
Fig. 2 is the expansion tube slide block type reducing expansion tool schematic diagram after closure；
Fig. 3 is the Section A-A figure in Fig. 2；
Fig. 4 is to enter well view using expansion tube slide block type reducing expansion tool；
Fig. 5 is application expansion tube slide block type reducing expansion tool underground closure state schematic diagram；
Fig. 6 is locking mechanism I close-up schematic views in Fig. 5.
In figure：1. on addendum cone, 2. expand sliding block, 3, lower base cone, 4. connecting tube, 5. the first expansion conical surface, 6. the second expansion conical surface, 7. the sizing conical surface, 8. addendum cone inclined-plane, 9. base cone inclined-plane, 10. sliding block ramp, 11. sliding block lower inclined plane, 12. inclined-plane rib, 13. rib groove, 14. upper limit plane, 15. sliding block top surface, 16. sliding block bottom surface, 17. lower limit plane, 18. locking mechanism, 1801. lock pipe nipple, 1802. Lock spring, 1803. closing piece, 1804. closing piece slot, 19. expansion tube, 20. expand starter, 21. fluid cylinder mechanism, 2101. fluid cylinder core, 2102. fluid cylinder set, 22. grade hole diameter expansion tube.
Embodiment
In conjunction with Figure of description, the invention is further described.
As shown in Figures 1 to 3, expansion tube slide block type reducing expansion tool（Hereinafter referred to as reducing expansion tool）, mainly including upper addendum cone 1, expansion sliding block 2 and the lower three parts of base cone 3.Upper addendum cone 1 and lower base cone 3 are through hole cone structure, and lower base cone 3 is machined with base cone inclined-plane 9, and several inclined-plane ribs 12 are machined with base cone inclined-plane 9, and top is connecting tube 4；Upper addendum cone 1 is located at the top of connecting tube 4 of lower base cone 3, is coordinated by the first expansion conical surface 5 with the formation sealing of expansion tube 19, bottom is machined with addendum cone inclined-plane 8, some inclined-plane ribs 12 are machined with addendum cone inclined-plane 8.Sliding block 2 is expanded to be located between upper addendum cone 1 and lower base cone 3, top is machined with the second expansion conical surface 6, quantity identical rib groove 13 is machined with sliding block ramp 10 and sliding block lower inclined plane 11, expansion sliding block 2 is connected by the inclined-plane rib 12 on rib groove 13 and upper addendum cone 1, lower base cone 3.
As shown in Figures 1 to 3, described expansion tube slide block type reducing expansion tool, the cone angle of sliding block ramp 10 is identical with the cone angle of addendum cone inclined-plane 8, and the cone angle of sliding block lower inclined plane 11 is identical with the cone angle of base cone inclined-plane 9；The quantity of inclined-plane rib 12 on rib groove 13 and addendum cone inclined-plane 8 and base cone inclined-plane 9 on its sliding block ramp 10 and sliding block lower inclined plane 11 is identical with the expansion quantity of sliding block 2, and inclined-plane rib 12 is handled by antifriction, in the present embodiment, and expansion sliding block 2 quantity is 6 pieces.
The cone angle of described expansion tube slide block type reducing expansion tool, its first expansion conical surface and the second expansion conical surface is 9~15 °, and the cone angle of the general second expansion conical surface is more than the cone angle of the first expansion conical surface.
As shown in figs. 1 to 6, locking mechanism 18 is machined with connecting tube 4 and the top of upper addendum cone 1, its locking mechanism 18 includes the parts such as locking pipe nipple 1801, Lock spring 1802, closing piece 1803 and closing piece slot 1804 and constituted.Before reducing expansion tool closure, the Lock spring 1802 of locking mechanism 18 is in compressive state, and the locking lower end of pipe nipple 1801 and closing piece 1803 are located in the closing piece slot 1804 in upper addendum cone 1；When reducing expansion tool is closed, locking mechanism 18 is also moved with connecting tube 4, when sliding block top surface 15 is contacted with upper limit plane 14, the 16 lower limit plane 17 also with lower base cone 3 of expansion sliding block bottom surface is contacted, the Lock spring 1802 of locking mechanism 18 discharges, the fluid cylinder that closing piece 1803 is released into fluid cylinder mechanism 21 covers 2102 inwalls, realizes to the spacing of upper addendum cone 1, and reducing expansion tool is locked in closure state.
As shown in Figures 4 and 5, described expansion tube slide block type reducing expansion tool, when entering well in the expansion starter 20 of the tubing string of expansion tube 19, reducing expansion tool top is connected with fluid cylinder mechanism 21, the fluid cylinder core 2101 of fluid cylinder mechanism 21 is connected with locking mechanism 18, locking mechanism 18 is connected with the connecting tube 4 of lower base cone 3, and fluid cylinder set 2102 is connected with upper addendum cone 1.Before reducing expansion tool closure, its sizing conical surface 7（The i.e. second expansion conical surface 6 extends downwardly isometrical section）External diameter is slightly less than the maximum outside diameter of addendum cone 1, is coordinated by the first expansion conical surface 5 with the formation sealing of expansion tube 19, locking mechanism 18 is in compressive state.Reducing expansion tool is under the effect of underground hydraulic pressure power, upper addendum cone 1 and the lower move toward one another of base cone 3, expansion sliding block 2 is promoted to be slided along addendum cone inclined-plane 8 and base cone inclined-plane 9, inclined-plane rib 12 and rib groove 13 remain matching relationship in sliding process, make expansion sliding block 2 that there is radial displacement, expansion tool realizes reducing effect.When the upper limit plane 14 of upper addendum cone 1 is contacted with expansion sliding block top surface 15, the expansion radial displacement of sliding block 2 reaches maximum, the first expansion expansion conical surface 6 of the conical surface 5 and second realizes that the common sealing with expansion tube 19 coordinates, now locking mechanism 18 is in release conditions, it is spacing to reducing expansion tool progress, reducing expansion tool is constantly in maximum gauge state after closing.In reducing expansion tool closing course, expansion starter 20 realizes underground reducing expansion in the case where expansion sliding block 2 is acted on, after after reducing expansion tool completely closure, expand the part of starter 20 internal diameter of hole diameter expansion tube 22 such as arrival in advance, under action of hydraulic force, expanding the conical surface 6 by the first expansion conical surface 5 and second can realize that the twin-stage of expansion tube 19 expands, the effect of the hole diameter expansion such as arrival.
Claims (6)
1. a kind of expansion tube slide block type reducing expansion tool, mainly by upper addendum cone [1], expansion sliding block [2] and lower base cone [3] three parts, it is characterized in that：Upper addendum cone [1] and lower base cone [3] are through hole cone structure, provided with the first expansion conical surface [5] and addendum cone inclined-plane [8] outside upper addendum cone [1], base cone inclined-plane [9] are provided with outside lower base cone [3], lower base cone [3] top is provided with the connecting tube [4] being slidably matched with upper addendum cone [1]；Sliding block [2] is expanded to be located between upper addendum cone [1] and lower base cone [3], the ring-type cone structure that sliding block [2] circumferential abutment is constituted is expanded by 3-12 blocks, it is outside that expansion sliding block [2] is enclosed on connecting tube [4], expand outside sliding block [2] provided with the second expansion conical surface [6], the sliding block ramp [10] and sliding block lower inclined plane [11] coordinated with addendum cone inclined-plane [8] and base cone inclined-plane [9] is respectively equipped with inside expansion sliding block [2], addendum cone inclined-plane [8] and sliding block ramp [10], base cone inclined-plane [9] and sliding block lower inclined plane [11] are made up of the inclined-plane rib [12] on its involutory surface and rib groove [13] and spacing slide cooperation, expansion sliding block [2] passes through rib groove [13] and upper addendum cone [1], spacing addendum cone [1] top and connecting tube [4] joint portion of being slidably fitted on lower base cone [3] is provided with locking mechanism [18].
2. expansion tube as claimed in claim 1 slide block type reducing expansion tool, it is characterised in that：Described locking mechanism [18] includes locking pipe nipple [1801], Lock spring [1802], closing piece [1803] and closing piece slot [1804], wherein, lock pipe nipple [1801] bottom and be provided with annular groove, Lock spring [1802], closing piece [1803] are located in annular groove, closing piece slot [1804] is located between upper addendum cone [1] and connecting tube [4], lock pipe nipple [1801] lower end and constitute grafting cooperation with closing piece slot [1804], and closing piece [1803] stops cooperation with being constituted at the top of upper addendum cone [1].
3. expansion tube as claimed in claim 1 or 2 slide block type reducing expansion tool, it is characterised in that：Described sliding block ramp [10] cone angle is identical with addendum cone inclined-plane [8] cone angle, and sliding block lower inclined plane [11] cone angle is identical with base cone inclined-plane [9] cone angle.
4. expansion tube as claimed in claim 3 slide block type reducing expansion tool, it is characterised in that：It is 6 pieces to expand sliding block [2] quantity, and it is 1 that every piece of expansion sliding block [2], which corresponds to addendum cone inclined-plane [8], the inclined-plane rib [12] on base cone inclined-plane [9] or rib groove [13],.
5. expansion tube as claimed in claim 3 slide block type reducing expansion tool, it is characterised in that：The cone angle of the first described expansion conical surface [5] is 8~15 °, and the cone angle of the second expansion conical surface [6] is 9~16 °, and the cone angle of the second expansion conical surface [6] is more than the first cone angle for expanding the conical surface [5].
6. expansion tube slide block type reducing expansion tool as claimed in claim 3, it is characterised in that：The first expansion conical surface [5] and the second expansion conical surface [6] are extended with isometrical section downwards, sliding block top surface [15] and sliding block bottom surface [16] are respectively equipped with the top and bottom of expansion sliding block [2], sliding block top surface [15] and sliding block bottom surface [16] constitute spacing stop with the upper limit plane [14] for being arranged on first isometrical section of lower end of the expansion conical surface [5] and the lower limit plane [17] for being arranged on lower base cone [3] bottom respectively and coordinated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610092473.8A CN107100575A (en) | 2016-02-19 | 2016-02-19 | Expansion tube slide block type reducing expansion tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610092473.8A CN107100575A (en) | 2016-02-19 | 2016-02-19 | Expansion tube slide block type reducing expansion tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107100575A true CN107100575A (en) | 2017-08-29 |
Family
ID=59658801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610092473.8A Pending CN107100575A (en) | 2016-02-19 | 2016-02-19 | Expansion tube slide block type reducing expansion tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107100575A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101238273A (en) * | 2005-08-05 | 2008-08-06 | 国际壳牌研究有限公司 | Pipe expander |
| CN101906947A (en) * | 2009-06-04 | 2010-12-08 | 中国石化集团胜利石油管理局钻井工艺研究院 | Umbrella type variable gauge inflate tool for expansion tube |
| CN103015934A (en) * | 2012-12-18 | 2013-04-03 | 中国石油天然气股份有限公司 | Connecting rod structure of dismantled and assembled expansion awl |
| CN203783508U (en) * | 2014-01-22 | 2014-08-20 | 胜利油田现河工贸有限责任公司 | Tensioner for repairing lining oil tube |
| CN205638309U (en) * | 2016-02-19 | 2016-10-12 | 中石化石油工程技术服务有限公司 | Slider formula reducing inflation instrument for expansion pipe |
-
2016
- 2016-02-19 CN CN201610092473.8A patent/CN107100575A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101238273A (en) * | 2005-08-05 | 2008-08-06 | 国际壳牌研究有限公司 | Pipe expander |
| CN101906947A (en) * | 2009-06-04 | 2010-12-08 | 中国石化集团胜利石油管理局钻井工艺研究院 | Umbrella type variable gauge inflate tool for expansion tube |
| CN103015934A (en) * | 2012-12-18 | 2013-04-03 | 中国石油天然气股份有限公司 | Connecting rod structure of dismantled and assembled expansion awl |
| CN203783508U (en) * | 2014-01-22 | 2014-08-20 | 胜利油田现河工贸有限责任公司 | Tensioner for repairing lining oil tube |
| CN205638309U (en) * | 2016-02-19 | 2016-10-12 | 中石化石油工程技术服务有限公司 | Slider formula reducing inflation instrument for expansion pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2655786B1 (en) | Downhole release joint with radially expandable member | |
| WO2017114149A1 (en) | Mechanical and hydraulic dual-effect expansion device for well drilling with expandable tubular technology | |
| US8695699B2 (en) | Downhole release joint with radially expandable member | |
| US20160123100A1 (en) | Angled segmented backup ring | |
| NO20141195A1 (en) | Seal with metal sealing element | |
| EP3303758B1 (en) | Multi-function dart | |
| US10450829B2 (en) | Drillable plug | |
| US10208572B2 (en) | Apparatus and method for perforating a subterranean formation | |
| CN205638309U (en) | Slider formula reducing inflation instrument for expansion pipe | |
| NO20171958A1 (en) | High-load collet shifting tool | |
| CN106194087A (en) | A kind of heavy caliber jumping chisel journey core drill and core-drilling method | |
| US20170175485A1 (en) | Downhole system | |
| MX2013005527A (en) | Entry guide formation on a well liner hanger. | |
| EP3400360B1 (en) | Big bore running tool quick lock adaptor | |
| CN203230377U (en) | Ball throwing type rapid drillable bridge plug | |
| CN108060901B (en) | Release mechanism for open hole patching tool of equal-well-diameter expansion casing | |
| CN107100575A (en) | Expansion tube slide block type reducing expansion tool | |
| WO2014174325A2 (en) | Downhole apparatus and method | |
| CN203925403U (en) | Downhole drill expandable sleeve is swollen seal apparatus | |
| CN113464091B (en) | A reaming is instrument of opening by force for in relief valve in pit | |
| US11220880B2 (en) | Annular barrier with bite connection | |
| CN111827913A (en) | Well drilling operation unfreezing device | |
| CN109681121A (en) | A kind of downhole drill bidirectional eccentric pipe nipple expanding drilling tool | |
| EP3246513A1 (en) | Downhole system having lateral sections | |
| EP3216975A1 (en) | Downhole system |
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: 20170829 |