CN104088595B - Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism - Google Patents
Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism Download PDFInfo
- Publication number
- CN104088595B CN104088595B CN201410293825.7A CN201410293825A CN104088595B CN 104088595 B CN104088595 B CN 104088595B CN 201410293825 A CN201410293825 A CN 201410293825A CN 104088595 B CN104088595 B CN 104088595B
- Authority
- CN
- China
- Prior art keywords
- oil pipe
- double layer
- layer oil
- inner tube
- outer tube
- 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
- 238000002955 isolation Methods 0.000 title claims abstract description 63
- 230000002265 prevention Effects 0.000 title claims abstract description 15
- 230000007246 mechanism Effects 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 239000004576 sand Substances 0.000 abstract description 16
- 238000005406 washing Methods 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Landscapes
- Pipeline Systems (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The present invention relates to a kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism.The present invention is in the operations such as horizontal well sand washing, when non-current insulating space length is more than in the case of perforated interval length, along with tubing string deepens continuously shaft bottom, segregate perforated interval is the most, then its lost circulation prevention function is the most obvious, and efficiency and the utilization rate of cycle of operation liquid are the highest.The technical solution used in the present invention includes two identical double layer oil pipe isolation steering knuckles by the connection of double layer oil pipe pipe string structure, is respectively upper double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle.
Description
Technical field
The present invention relates to a kind of horizontal well sand washing device, especially one horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism.
Background technology
When conventional application double layer oil pipe carries out horizontal well sand washing clean-out service, the all or part of double layer oil pipe of general employing or concentric oil tubes carry out operation, the packer coordinated with it only coordinates the construction of sand washing drill bit in bottom, does not possess preventing or reduces the function of formation leakage.In this kind of construction, owing to the perforated interval of horizontal well has rice up to a hundred even to go up more than km, each of which perforated interval both participates in the liquid circulation of sand washing operation, and therefore the wastage on stratum is the most considerable.The leakage of sand washing liquid, not only directly reduces the work efficiency of sand cleaning fluid, stratum is more caused various pollution, make the oil productive capacity on stratum reduce, and more difficult recovery.
Summary of the invention
It is an object of the invention to provide a kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism preventing stratum from missing sand cleaning fluid in a large number in horizontal well sand washing operation.
For solving above-mentioned technical problem, the technical scheme is that a kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, including two the identical double layer oil pipe isolation steering knuckles connected by double layer oil pipe pipe string structure, it is respectively upper double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle；
Described double layer oil pipe isolation steering knuckle includes the outer tube of the most sheathed different tube diameters, inner tube and tubing coupling, forms double layer oil pipe annular space between outer tube and inner tube, and the outer tube outer wall two ends of double layer oil pipe isolation steering knuckle are respectively arranged with tubing coupling；Double layer oil pipe annular space is included the blind end formed by horn-like joint and connects end, and described horn-like joint is cavity body, its big end and the tube wall end airtight connection of outer tube and its end and outer tube end flush, small end and inner tube airtight connection；It is arranged with, on the outer tube of double layer oil pipe isolation steering knuckle, the self-styled gum cover being close to its outer wall, the two ends of self-styled gum cover are provided with spacer ring, spacer ring sidepiece near blind end is provided with stop collar, it is provided with flow channels on described stop collar, the outer tube wall below stop collar is provided with the through hole corresponding with flow channels；
Described double layer oil pipe pipe string structure is made up of several double layer oil pipes being sequentially communicated, the outer tube of each double layer oil pipe is identical with the caliber of upper strata oil pipe isolation steering knuckle with inner tube diameter, its two ends are respectively arranged with box cupling, described box cupling includes inner tube slip joint and the outer tube box cupling of tubulose, described outer tube box cupling passes through screwed connection on outer tube outer wall top, the outer wall of inner tube slip joint is provided with locating snap ring, connected by outer tube box cupling between the outer tube of adjacent double-layers oil pipe, between its inner tube, seal, by inner tube slip joint, connection of sliding；
The end that connect of the double layer oil pipe annular space of upper double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle passes through outer tube box cupling respectively and connects with inner tube slip joint and be positioned at double layer oil pipe pipe string top and the double layer oil pipe of bottom；The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is connected with outer tube screw threads of coupler by screw thread respectively, and its inner tube is connected by inner tube slip joint；The inner chamber of the inner tube that the top and bottom of inner tube slip joint are respectively protruding into double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle is formed the piston structure of salable slip with its inwall.
In described double layer oil pipe pipe string structure, the inner tube of each double layer oil pipe is suspended on the arrival end of outer tube body by being arranged on the interior pipe hanger hoop of its outer wall end；Interior pipe hanger hoop is tightened on the screw thread of outer wall of inner tube end by screw thread, and the extension hoop being provided above preventing interior pipe hanger from threading off at interior pipe hanger hoop is tightened on outer wall of inner tube screw thread by screw thread for cap, the standby cap of extension hoop；Said inner tube is hung hoop and is included annular fastener and right angled triangle suspender, one right-angle side of right angle trigonometry suspender is fixing with the outer wall of annular fastener to be connected, another right-angle side and the oil pipe body porch contact internal walls of the top flush of annular fastener, its hypotenuse and outer tube.
Compared with prior art, the method have the advantages that the present invention carries out well-flushing or sand washing operation in horizontal well, can make oil jacket annular space is formed specific non-current insulating space；After shaft bottom perforated interval enters this non-current insulating space, the liquid circulating system having can be isolated, thus stop or reduce the formation leakage of this perforated interval, and then reduce formation contaminant, and make the utilization ratio of work on hand circulating liquid keep not dropping；In the operations such as horizontal well sand washing, when non-current insulating space length is more than in the case of perforated interval length, along with tubing string deepens continuously shaft bottom, segregate perforated interval is the most, then its lost circulation prevention function is the most obvious, and efficiency and the utilization rate of cycle of operation liquid are the highest.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of double layer oil pipe isolation steering knuckle；
Fig. 3 is the structural representation of upper double layer oil pipe isolation steering knuckle and double layer oil pipe junction；
Fig. 4 is interior pipe hanger cuff structure schematic diagram；
Fig. 5 is for hanging the standby cap schematic diagram of hoop.
Wherein: 1. double layer oil pipe pipe string structure；2. go up double layer oil pipe isolation steering knuckle；3. descend double layer oil pipe to isolate steering knuckle；4. outer tube；5. inner tube；6. double layer oil pipe annular space；The most horn-like joint；8. blind end；9. connection end；The most self-styled gum cover；11. spacer rings；12. stop collars；13. flow channels；14. through holes；15. tubing couplings；16. inner tube slip joint；17.
Interior pipe hanger hoop；18. hang the standby cap of hoop；19. locating snap rings；20. annular fasteners；21. right angled triangle suspenders.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
See Fig. 1, horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, including two the identical double layer oil pipes isolation steering knuckles connected by double layer oil pipe pipe string structure, it is respectively upper double layer oil pipe isolation steering knuckle 2 and lower double layer oil pipe isolation steering knuckle 3；
See Fig. 2, double layer oil pipe isolation steering knuckle includes the outer tube 4 of the most sheathed different tube diameters, inner tube 5 and tubing coupling, forming double layer oil pipe annular space 6 between outer tube 4 and inner tube 5, the outer tube outer wall two ends of double layer oil pipe isolation steering knuckle are respectively arranged with tubing coupling；Double layer oil pipe annular space 6 is included the blind end 8 formed by horn-like joint 7 and connects end 9, and described horn-like joint is cavity body, its big end and the tube wall end airtight connection of outer tube and its end and outer tube end flush, small end and inner tube airtight connection；It is arranged with, on the outer tube of double layer oil pipe isolation steering knuckle, the self-styled gum cover 10 being close to its outer wall, the two ends of self-styled gum cover 10 are provided with spacer ring 11, spacer ring sidepiece near blind end is provided with stop collar 12, it is provided with flow channels 13 on described stop collar, outer tube 4 tube wall below stop collar 12 is provided with the through hole 14 corresponding with flow channels 13；
Double layer oil pipe pipe string structure is made up of several double layer oil pipes being sequentially communicated, the outer tube of each double layer oil pipe is identical with the caliber of upper strata oil pipe isolation steering knuckle with inner tube diameter, its two ends are respectively arranged with box cupling, described box cupling includes inner tube slip joint 16 and the outer tube box cupling of tubulose, described outer tube box cupling makes the outer tube of adjacent double-layers oil pipe connect by screwed connection on outer tube outer wall top, the outer wall of inner tube slip joint 16 is provided with locating snap ring, connected by inner tube slip joint between the inner tube of adjacent double-layers oil pipe, formed and seal the piston structure slided；The external diameter of locating snap ring is more than inner tube diameter.
Seeing Fig. 1 and Fig. 3, the end 9 that connect of the double layer oil pipe annular space 6 of upper double layer oil pipe isolation steering knuckle 2 and lower double layer oil pipe isolation steering knuckle 3 passes through outer tube box cupling 15 respectively and connects with inner tube slip joint 16 and be positioned at double layer oil pipe pipe string top and the double layer oil pipe of bottom；The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is connected with outer tube screw threads of coupler by screw thread respectively, and its inner tube is connected by inner tube slip joint 16；The inner chamber of the inner tube that the top and bottom of inner tube slip joint 16 are respectively protruding into double layer oil pipe isolation steering knuckle 2 and lower double layer oil pipe isolation steering knuckle 3 is formed the piston structure of salable slip with its inwall.
In the double layer oil pipe pipe string structure of the present invention, the inner tube of each double layer oil pipe is suspended on the arrival end of outer tube body by being symmetricly set on the interior pipe hanger hoop 17 of its outer wall end；Interior pipe hanger hoop 17 is tightened on the screw thread of outer wall of inner tube end by screw thread, and the extension hoop being provided above preventing interior pipe hanger hoop 17 from threading off at interior pipe hanger hoop 17, for cap 18, sees Fig. 4, hangs the standby cap 18 of hoop and is tightened on outer wall of inner tube screw thread by screw thread；Said inner tube is hung hoop and is included annular fastener 20 and right angled triangle suspender 21, see Fig. 5, one right-angle side of right angle trigonometry suspender 21 is fixing with the outer wall of annular fastener 20 to be connected, another right-angle side and the body porch contact internal walls of the top flush of annular fastener 20, its hypotenuse and outer tube.
The operation principle of the present invention is: from oil jacket annular space infusion sand cleaning fluid, after liquid runs into the upper double layer oil pipe isolation steering knuckle of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, under the stop of self-styled gum cover, sand cleaning fluid turns to be crossed in the double layer oil pipe annular space that opening enters into double layer oil pipe isolation cycle mechanism from the outer tube wall of stop collar and correspondence thereof, continue traveling downwardly, at the lower double layer oil pipe isolation steering knuckle of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, flow out from the stop collar through hole crossing opening and correspondence thereof of its outer tube, arrive oil jacket annular space, under the buffer action of self-styled gum cover, liquid stream will continue traveling downwardly to other devices connected, in the process, this device reaches the purpose preventing stratum from missing sand cleaning fluid in a large number.
Double layer oil pipe isolation steering knuckle in horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, it is to coordinate with the self-styled gum cover on double layer oil pipe and its two end connector, form one section of casing annulus closed, so that horizontal well partial completion section is isolated out sand cleaning fluid circulating system, reach the purpose preventing stratum from missing sand cleaning fluid in a large number.In horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, the double layer oil pipe in double layer oil pipe pipe string can combine (low cost) according to method plain tubing of the present invention, it is possible to uses special concentric oil tubes (cost is high).
Claims (2)
1. a horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, it is characterized in that: include two identical double layer oil pipe isolation steering knuckles by the connection of double layer oil pipe pipe string structure, be respectively upper double layer oil pipe isolation steering knuckle (2) and lower double layer oil pipe isolation steering knuckle (3)；
Described double layer oil pipe isolation steering knuckle includes the outer tube (4) of the most sheathed different tube diameters, inner tube (5) and tubing coupling, forming double layer oil pipe annular space (6) between outer tube (4) and inner tube (5), the outer tube outer wall two ends of double layer oil pipe isolation steering knuckle are respectively arranged with tubing coupling；Double layer oil pipe annular space (6) is included the blind end (8) formed by horn-like joint (7) and connects end (9), described horn-like joint is cavity body, the tube wall end airtight connection of its big end and outer tube and its end and outer tube end flush, small end and inner tube airtight connection；It is arranged with, on the outer tube of double layer oil pipe isolation steering knuckle, the self-styled gum cover (10) being close to its outer wall, the two ends of self-styled gum cover (10) are provided with spacer ring (11), spacer ring sidepiece near blind end is provided with stop collar (12), it is provided with flow channels (13) on described stop collar, outer tube (4) tube wall of stop collar (12) lower section is provided with the through hole (14) corresponding with flow channels (13)；
Described double layer oil pipe pipe string structure is made up of several double layer oil pipes being sequentially communicated, the outer tube caliber of each double layer oil pipe is identical with the outer tube caliber of upper strata oil pipe isolation steering knuckle, the inner tube diameter of each double layer oil pipe is identical with the inner tube diameter of upper strata oil pipe isolation steering knuckle, its two ends are respectively arranged with box cupling, described box cupling includes inner tube slip joint (16) and the outer tube box cupling of tubulose, described outer tube box cupling makes the outer tube of adjacent double-layers oil pipe connect by screwed connection on outer tube outer wall top, the outer wall of inner tube slip joint (16) is provided with locating snap ring, the external diameter of locating snap ring is more than inner tube diameter, connected by inner tube slip joint between the inner tube of adjacent double-layers oil pipe, formed and seal the piston structure slided；
The end (9) that connects of the double layer oil pipe annular space (6) of upper double layer oil pipe isolation steering knuckle (2) and lower double layer oil pipe isolation steering knuckle (3) passes through outer tube box cupling (15) respectively and connects with inner tube slip joint (16) and to be positioned at double layer oil pipe pipe string top and the double layer oil pipe of bottom；The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is connected with outer tube screw threads of coupler by screw thread respectively, and its inner tube is connected by inner tube slip joint (16)；The inner chamber of the inner tube that the top and bottom of inner tube slip joint (16) are respectively protruding into double layer oil pipe isolation steering knuckle (2) and lower double layer oil pipe isolation steering knuckle (3) is formed the piston structure of salable slip with its inwall.
Horizontal well the most according to claim 1 lost circulation prevention double layer oil pipe isolation cycle mechanism, it is characterised in that: in described double layer oil pipe pipe string structure, the inner tube of each double layer oil pipe is suspended on the arrival end of outer tube body by being symmetricly set on the interior pipe hanger hoop (17) of its outer wall end；Interior pipe hanger hoop (17) is tightened on the screw thread of outer wall of inner tube end by screw thread, and the extension hoop being provided above preventing interior pipe hanger hoop (17) from threading off interior pipe hanger hoop (17) is tightened on outer wall of inner tube screw thread by screw thread for cap (18), the standby cap (18) of extension hoop；Said inner tube is hung hoop and is included annular fastener (20) and right angled triangle suspender (21), one right-angle side of right angled triangle suspender (21) is fixing with the outer wall of annular fastener (20) to be connected, another right-angle side and the body porch contact internal walls of the top flush of annular fastener (20), its hypotenuse and outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293825.7A CN104088595B (en) | 2014-06-27 | 2014-06-27 | Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410293825.7A CN104088595B (en) | 2014-06-27 | 2014-06-27 | Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104088595A CN104088595A (en) | 2014-10-08 |
| CN104088595B true CN104088595B (en) | 2016-08-31 |
Family
ID=51636341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410293825.7A Active CN104088595B (en) | 2014-06-27 | 2014-06-27 | Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104088595B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201068748Y (en) * | 2007-10-17 | 2008-06-04 | 大庆油田有限责任公司 | Horizontal well continue sand-flushing device |
| CN202441288U (en) * | 2012-01-16 | 2012-09-19 | 索昆 | Sand washing pipe of oil field horizontal well |
| CN202788688U (en) * | 2012-09-24 | 2013-03-13 | 刘丽宁 | Underground well leakage-proof sand washing device |
| CN203022643U (en) * | 2012-11-03 | 2013-06-26 | 中国石油化工股份有限公司 | Loss oil layer double-tube continuous sand removal tubular column |
| CN204060576U (en) * | 2014-06-27 | 2014-12-31 | 西安中孚凯宏石油科技有限责任公司 | A kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6415877B1 (en) * | 1998-07-15 | 2002-07-09 | Deep Vision Llc | Subsea wellbore drilling system for reducing bottom hole pressure |
-
2014
- 2014-06-27 CN CN201410293825.7A patent/CN104088595B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201068748Y (en) * | 2007-10-17 | 2008-06-04 | 大庆油田有限责任公司 | Horizontal well continue sand-flushing device |
| CN202441288U (en) * | 2012-01-16 | 2012-09-19 | 索昆 | Sand washing pipe of oil field horizontal well |
| CN202788688U (en) * | 2012-09-24 | 2013-03-13 | 刘丽宁 | Underground well leakage-proof sand washing device |
| CN203022643U (en) * | 2012-11-03 | 2013-06-26 | 中国石油化工股份有限公司 | Loss oil layer double-tube continuous sand removal tubular column |
| CN204060576U (en) * | 2014-06-27 | 2014-12-31 | 西安中孚凯宏石油科技有限责任公司 | A kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104088595A (en) | 2014-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104074485B (en) | A kind of horizontal well lost circulation prevention cyclone sand washing device device and sand washing process thereof | |
| CN202500540U (en) | Three-way injection-production wellhead device | |
| CN202500518U (en) | Integrated oil casing head for well drilling and completion | |
| CN203452759U (en) | Parallel double-tube steam injection wellhead device | |
| CN104088595B (en) | Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism | |
| CN204060576U (en) | A kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism | |
| CN203978311U (en) | A kind of double layer oil pipe | |
| CN205743734U (en) | The built-in oil drill rocker of oil pipe | |
| CN201786314U (en) | Embedded blowout preventer of sucker rod | |
| CN204040963U (en) | Liner hanger | |
| CN205117297U (en) | Concentric double -barrelled gas well flow string | |
| CN202745939U (en) | Coiled tubing hanger | |
| CN204060540U (en) | A kind of double layer oil pipe isolation steering knuckle | |
| CN205955792U (en) | Be applied to and advance oil pipe structure on car booster | |
| CN204851156U (en) | Blowout prevention system for tripping sucker rod | |
| CN202970551U (en) | Continuous sand washing device for non-coupling oil pipe | |
| CN203321472U (en) | Double-barrelled wellhead assembly of viscous crude thermal recovery | |
| CN103696703A (en) | Heat-insulating oil pipe used for small-caliber oil well | |
| CN209179719U (en) | A kind of closed type wellhead for production | |
| CN105909196A (en) | Double-layer pipe unit in sand washover process | |
| CN206267836U (en) | Producing well wax-proofing apparatus and its system | |
| CN205012958U (en) | Dabber hanger that can exchange with slips hanger | |
| CN210460527U (en) | A connection device for oil well fracturing pipeline | |
| CN203978378U (en) | Grey instrument is squeezed in a kind of packing | |
| CN204371190U (en) | Multi-pipe wellhead conversion single-pipe wellhead device for three-pipe wellhead and blowout preventer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |