CN104088595A - Horizontal well leakage-preventing double-layer oil pipe isolating circulation mechanism - Google Patents
Horizontal well leakage-preventing double-layer oil pipe isolating circulation mechanism Download PDFInfo
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- CN104088595A CN104088595A CN201410293825.7A CN201410293825A CN104088595A CN 104088595 A CN104088595 A CN 104088595A CN 201410293825 A CN201410293825 A CN 201410293825A CN 104088595 A CN104088595 A CN 104088595A
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Abstract
The invention relates to a horizontal well leakage-preventing double-layer oil pipe isolating circulation mechanism. When a double-layer oil pipe is conventionally applied to perform horizontal well sand washing and well washing operation, a whole or partial double-layer oil pipe or a concentric oil pipe are adopted to perform operation, the oil pipe does not have a function of preventing or reducing stratum loss, sand washing liquid loss directly causes reduction of the working efficiency of sand washing liquid, various stratum pollutions are caused, and the oil producing capability of the stratum is reduced. The horizontal well leakage-preventing double-layer oil pipe isolating circulation mechanism comprises two identical double-layer oil pipe isolation steering connectors, namely an upper double-layer oil pipe isolation steering connector and a lower double-layer oil pipe isolation steering connector which are communicated through a double-layer oil pipe string structure. When the mechanism is applied to horizontal well sand washing and other operations under the condition that the non-flowing isolation space length is larger than the perforation well section length, isolated perforation sections are increased, a leakage-preventing function is obvious and the efficiency of working circulation liquid and utilization rate are high along with pipe columns constantly going deep into the shaft bottom.
Description
Technical field
the present invention relates to a kind of horizontal well sand washing device, especially a kind of 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, general all or part of double layer oil pipe or the concentric oil tubes of adopting carries out operation, the packer being mated is only in the construction that coordinates bottom sand washing drill bit, do not possess preventing or reduces the function of formation leakage.In the construction of this class, because having rice up to a hundred, even goes up more than km the perforated interval of horizontal well, and its each perforated interval all participates in the liquid-circulating of sand washing operation, and therefore the wastage on stratum is very considerable.The leakage of sand washing liquid, has not only directly reduced the operating efficiency of sand cleaning fluid, more various pollutions is caused in stratum, and the oil productive capacity on stratum is reduced, and more difficult recovery.
Summary of the invention
The object of this invention is to provide and a kind ofly in horizontal well sand washing operation, prevent that stratum from missing the horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism of sand cleaning fluid in a large number.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, comprise two identical double layer oil pipe isolation steering knuckles that are communicated with by double layer oil pipe pipe string structure, be respectively double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle;
Described double layer oil pipe isolation steering knuckle comprises outer tube, inner tube and the tubing coupling of coaxial sheathed different tube diameters, 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 comprises the blind end that forms by horn-like joint and is communicated with end, and described horn-like joint is cavity body, the tube wall end of its large end and outer tube is airtight be connected and its end equal with outer tube end together, small end is connected with inner tube is airtight; On the outer tube of double layer oil pipe isolation steering knuckle, be arranged with the self-styled gum cover of 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, on described stop collar, be provided with flow channels, on the outer tube wall of stop collar below, be 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 that are communicated with successively, 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 comprises inner tube slip joint and the outer tube box cupling of tubulose, described outer tube box cupling by screwed connection on outer tube outer wall top, the outer wall of inner tube slip joint is provided with locating snap ring, between the outer tube of adjacent double-layers oil pipe, be communicated with by outer tube box cupling, between its inner tube, slide and be communicated with by the sealing of inner tube slip joint;
The connection end 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 is communicated with by outer tube box cupling and inner tube slip joint the double layer oil pipe that is positioned at double layer oil pipe pipe string top and bottom respectively; The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is respectively by screw thread and the screwed connection of external pipe connection hoop, and its inner tube connects by inner tube slip joint; The piston structure that forms salable slip in the inner chamber of inner tube of double layer oil pipe isolation steering knuckle and lower double layer oil pipe isolation steering knuckle with its inwall is stretched into respectively in the top and bottom of inner tube slip joint.
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 in by screw thread on the screw thread of outer wall of inner tube end, is provided with the extension hoop that prevents interior pipe hanger dropout for cap above interior pipe hanger hoop, hangs the standby cap of hoop and is tightened on outer wall of inner tube screw thread by screw thread; Described interior pipe hanger hoop comprises annular fastener and right-angled triangle suspender, a right-angle side of right angle trigonometry suspender is fixedly connected with the outer wall of annular fastener, another right-angle side is mutually concordant with the top of annular fastener, and its hypotenuse contacts with the oil pipe body entrance inwall of outer tube.
Compared with prior art, the present invention has following beneficial effect: the present invention carries out well-flushing or sand washing operation in horizontal well, can make to form in oil jacket annular space specific non-current insulating space; When shaft bottom perforated interval enters after this non-current insulating space, can be isolated the liquid-circulating system having, thereby 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 fluid keep not falling; In the operations such as horizontal well sand washing, when non-current insulating space length is greater than in the situation of perforated interval length, along with the tubing string shaft bottom that deepens continuously, segregate perforated interval is more, and its lost circulation prevention function is more obvious, and efficiency and the utilization rate of working cycles liquid are higher.
Brief description of the drawings
Fig. 1 is 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 isolation steering knuckle; 4. outer tube; 5. inner tube; 6. double layer oil pipe annular space; 7. horn-like joint; 8. blind end; 9. be communicated with end; 10. 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 hoops; 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.
Referring to Fig. 1, horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, comprises two identical double layer oil pipe isolation steering knuckles that are communicated with by double layer oil pipe pipe string structure, is respectively double layer oil pipe isolation steering knuckle 2 and lower double layer oil pipe isolation steering knuckle 3;
Referring to Fig. 2, double layer oil pipe isolation steering knuckle comprises outer tube 4, inner tube 5 and the tubing coupling of coaxial sheathed different tube diameters, between outer tube 4 and inner tube 5, form double layer oil pipe annular space 6, 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 comprises the blind end 8 forming by horn-like joint 7 and is communicated with end 9, and described horn-like joint is cavity body, the tube wall end of its large end and outer tube is airtight be connected and its end equal with outer tube end together, small end is connected with inner tube is airtight; On the outer tube of double layer oil pipe isolation steering knuckle, be arranged with the self-styled gum cover 10 of 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, on described stop collar, be provided with flow channels 13, on outer tube 4 tube walls of stop collar 12 belows, be provided with the through hole corresponding with flow channels 13 14;
Double layer oil pipe pipe string structure is made up of several double layer oil pipes that are communicated with successively, 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 comprises 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 be communicated with on outer tube outer wall top by screwed connection, the outer wall of inner tube slip joint 16 is provided with locating snap ring, between the inner tube of adjacent double-layers oil pipe, be communicated with by inner tube slip joint, form the piston structure that sealing is slided; The external diameter of locating snap ring is greater than inner tube diameter.
Referring to Fig. 1 and Fig. 3, the connection end 9 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 is communicated with by outer tube box cupling 15 and inner tube slip joint 16 double layer oil pipe that is positioned at double layer oil pipe pipe string top and bottom respectively; The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is respectively by screw thread and the screwed connection of external pipe connection hoop, and its inner tube connects by inner tube slip joint 16; The piston structure that forms salable slip in the inner chamber of inner tube of double layer oil pipe isolation steering knuckle 2 and lower double layer oil pipe isolation steering knuckle 3 with its inwall is stretched into respectively in the top and bottom of inner tube slip joint 16.
In 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 in by screw thread on the screw thread of outer wall of inner tube end, is provided with and prevents that extension hoop that interior pipe hanger hoop 17 threads off from, for cap 18, referring to Fig. 4, hanging the standby cap 18 of hoop and being tightened on outer wall of inner tube screw thread by screw thread above interior pipe hanger hoop 17; Described interior pipe hanger hoop comprises annular fastener 20 and right-angled triangle suspender 21, referring to Fig. 5, a right-angle side of right angle trigonometry suspender 21 is fixedly connected with the outer wall of annular fastener 20, another right-angle side is mutually concordant with the top of annular fastener 20, and its hypotenuse contacts with the body entrance inwall of outer tube.
Operating principle of the present invention is: from oil jacket annular space infusion sand cleaning fluid, liquid runs into after the upper double layer oil pipe isolation steering knuckle of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, under the stopping of self-styled gum cover, sand cleaning fluid turns to the opening of crossing from the outer tube wall of stop collar and correspondence thereof to enter in the double layer oil pipe annular space of double layer oil pipe isolation cycle mechanism, continue descending, to the lower double layer oil pipe isolation steering knuckle place of horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism, flow out from the stop collar through hole of 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 to go downwards to other connected devices, in this process, this device reaches and prevents that stratum from missing the object of 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, to coordinate with the self-styled gum cover on double layer oil pipe and its two end joint, form the sleeve pipe annular space of one section of sealing, thereby make horizontal well partial completion section be isolated out sand cleaning fluid circulating system, reach and prevent that stratum from missing the object of sand cleaning fluid in a large number.Double layer oil pipe in horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism in double layer oil pipe pipe string can combine (cost is low) with plain tubing according to method of the present invention, also can adopt 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: comprise two identical double layer oil pipe isolation steering knuckles that are communicated with by double layer oil pipe pipe string structure, be respectively 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 comprises outer tube (4), inner tube (5) and the tubing coupling of coaxial sheathed different tube diameters, between outer tube (4) and inner tube (5), form double layer oil pipe annular space (6), 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) comprises the blind end (8) forming by horn-like joint (7) and is communicated with end (9), described horn-like joint is cavity body, the tube wall end of its large end and outer tube is airtight be connected and its end equal with outer tube end neat, small end is connected with inner tube is airtight; On the outer tube of double layer oil pipe isolation steering knuckle, be arranged with the self-styled gum cover (10) of 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), on described stop collar, be provided with flow channels (13), on outer tube (4) tube wall of stop collar (12) below, be 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 that are communicated with successively, 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 comprises 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 be communicated with on outer tube outer wall top by screwed connection, the outer wall of inner tube slip joint (16) is provided with locating snap ring, the external diameter of locating snap ring is greater than inner tube diameter, between the inner tube of adjacent double-layers oil pipe, be communicated with by inner tube slip joint, form the piston structure that sealing is slided,
The connection end (9) 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) is communicated with by outer tube box cupling (15) and inner tube slip joint (16) double layer oil pipe that is positioned at double layer oil pipe pipe string top and bottom respectively; The outer tube of upper double layer oil pipe isolation steering knuckle outer tube and lower double layer oil pipe isolation steering knuckle is respectively by screw thread and the screwed connection of external pipe connection hoop, and its inner tube connects by inner tube slip joint (16); The top and bottom of inner tube slip joint (16) are stretched into respectively double layer oil pipe isolation steering knuckle (2) and lower double layer oil pipe and are isolated the piston structure that forms salable slip in the inner chamber of inner tube of steering knuckle (3) with its inwall.
2. horizontal well lost circulation prevention double layer oil pipe isolation cycle according to claim 1 mechanism, is characterized 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 in by screw thread on the screw thread of outer wall of inner tube end, is provided with the extension hoop that prevents interior pipe hanger hoop (17) dropout for cap (18) in interior pipe hanger hoop (17) top, hangs the standby cap (18) of hoop and is tightened on outer wall of inner tube screw thread by screw thread; Described interior pipe hanger hoop comprises annular fastener (20) and right-angled triangle suspender (21), a right-angle side of right angle trigonometry suspender (21) is fixedly connected with the outer wall of annular fastener (20), another right-angle side is mutually concordant with the top of annular fastener (20), and its hypotenuse contacts with the body entrance inwall of 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 |
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| Publication Number | Publication Date |
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| CN104088595A true CN104088595A (en) | 2014-10-08 |
| CN104088595B CN104088595B (en) | 2016-08-31 |
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| CN201410293825.7A Active CN104088595B (en) | 2014-06-27 | 2014-06-27 | Horizontal well lost circulation prevention double layer oil pipe isolation cycle mechanism |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005095751A1 (en) * | 1998-07-15 | 2005-10-13 | Baker Hughes Incorporated | Modular design for downhole ecd-management devices and related methods |
| 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 |
-
2014
- 2014-06-27 CN CN201410293825.7A patent/CN104088595B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005095751A1 (en) * | 1998-07-15 | 2005-10-13 | Baker Hughes Incorporated | Modular design for downhole ecd-management devices and related methods |
| 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 |
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| CN104088595B (en) | 2016-08-31 |
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