CN204729046U - Pre-stress type thermal extraction casing head - Google Patents
Pre-stress type thermal extraction casing head Download PDFInfo
- Publication number
- CN204729046U CN204729046U CN201520493891.9U CN201520493891U CN204729046U CN 204729046 U CN204729046 U CN 204729046U CN 201520493891 U CN201520493891 U CN 201520493891U CN 204729046 U CN204729046 U CN 204729046U
- Authority
- CN
- China
- Prior art keywords
- production string
- seal casinghousing
- slips
- slips body
- upper shell
- 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
Abstract
The utility model discloses a kind of pre-stress type thermal extraction casing head, comprise the seal casinghousing be threaded with surface pipe, slips body is provided with between seal casinghousing and production string, inner surface and the production string of slips body are fastenedly connected, be provided with the diminishing sealing cone of internal diameter in the cavity of seal casinghousing, the lower end of slips body is provided with the slips conical surface matched with sealing cone; The upper end of slips body has been connected by screw the tight body of cone; The upper end of seal casinghousing has been bolted upper shell, is sealed and installed with middle platen between seal casinghousing and upper shell, middle platen and production string, forms annular sealed space between surface pipe and seal casinghousing; The step corresponding with production string external diameter is provided with in upper shell.The utility model, by increasing the cone locking structure of slips body, can guarantee that slips body is held tightly with production string all the time, avoids the phenomenon that the repeatedly card of slip insert to production string top layer hits and the clamping pair that occurs lost efficacy, can application life of extending sleeve tube head.
Description
Technical field
The utility model relates to well thermal recovery technical field, is specifically related to a kind of pre-stress type thermal extraction casing head.
Background technology
In recent decades, along with the quick growth of international petroleum demand, the exploitation of viscous crude obtains the attention of various countries' oil development business.So far the history due to heavy oil development is shorter, and for the technical equipment of heavy oil development and instrument still in continuing to improve.Especially for thermal extraction casing head, in the process that existing production string is altered in heat expansion and shrinkage moves down, there will be card repeatedly and hit, such slip insert of slips body inner surface is not easily aimed at the external surface of production string and damages, cause the secondary inefficacy of clamping like this, affect the application life of casing head.
Summary of the invention
The purpose of this utility model is exactly the defect existed for prior art, there is provided a kind of structure simple, reasonable in design, can guarantee that slips body holds production string tightly all the time, avoid because card hits and the secondary failure phenomenon of the clamping that occurs repeatedly, the pre-stress type thermal extraction casing head increased the service life.
Its technical scheme is: pre-stress type thermal extraction casing head, comprise the seal casinghousing be threaded with surface pipe, slips body is provided with between described seal casinghousing and production string, inner surface and the production string of described slips body are fastenedly connected, be provided with the diminishing sealing cone of internal diameter in the cavity of described seal casinghousing, the lower end of described slips body is provided with the slips conical surface matched with sealing cone; The upper end of described slips body is connected by screw the tight body of cone for fastener watt body and production string; The upper end of described seal casinghousing has been bolted upper shell, described upper shell is threaded with production tree, be sealed and installed with middle platen between described seal casinghousing and upper shell, described middle platen and production string, between surface pipe and seal casinghousing, form annular sealed space; The step corresponding with production string external diameter is provided with in described upper shell.
Seal between described middle platen and seal casinghousing and be provided with joint ring, described middle platen and seal between upper shell and production string and be provided with sealing ring.
The inner surface of the tight body of described cone is provided with the fastening conical surface suitable with the upper end external surface of slips body.
The both sides of described seal casinghousing are separately installed with the plug for shutoff casing annulus.
The utility model compared with prior art, have the following advantages: the utility model is by increasing the cone locking structure of slips body, can guarantee that slips body is held tightly with production string all the time, avoid the phenomenon that the repeatedly card of slip insert to production string top layer hits and the clamping pair that occurs lost efficacy, can application life of extending sleeve tube head.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of the utility model.
Detailed description of the invention
With reference to Fig. 1, pre-stress type thermal extraction casing head, comprise the seal casinghousing 6 be threaded with surface pipe 13, slips body 9 is provided with between described seal casinghousing 6 and production string 12, inner surface and the production string 12 of described slips body 9 are fastenedly connected, be provided with the diminishing sealing cone 61 of internal diameter in the cavity of described seal casinghousing 6, the lower end of described slips body 9 is provided with the slips conical surface 91 matched with sealing cone 61; Being matched with the slips conical surface 91 by sealing cone 61, production string 12 being made when moving down, slips body 9 is held tightly with production string 12 all the time, prevent from clamping secondary inefficacy.
The upper end of described slips body 9 is connected by screw for the cone tight body 8 of fastener watt body 9 with production string 12; The upper end slip insert 15 of slips body 9 can be made to hold tightly mutually with production string 12 all the time by boring tight body 8.
The upper end of described seal casinghousing 6 is connected with upper shell 1 by bolt 3, described upper shell 1 is threaded with production tree, be sealed and installed with middle platen 4 between described seal casinghousing 6 and upper shell 1, described middle platen 4 and production string 12, between surface pipe 13 and seal casinghousing 6, form annular sealed space 7; Production string 12 drives slips body 9 to move up and down phenomenon of expanding with heat and contract with cold in annular sealed space 7.
The step 14 corresponding with production string 12 external diameter is provided with in described upper shell 1.By step 14 can prevent production string 12 unconfined on move, play position-limiting action.
Seal between described middle platen 4 and seal casinghousing 6 and be provided with joint ring 5, described middle platen 4 and seal between upper shell 1 and production string 12 and be provided with sealing ring 2.
The inner surface of the tight body of described cone 8 is provided with the fastening conical surface 11 suitable with the upper end external surface of slips body 9.By set screws, the tight body 8 of cone is fastened to the top of slips body 9, and in fastener cycle by the fastening conical surface 11 and the conical surface of slips body 9 external surface make the slip insert 15 on slips body 9 top all the time tightly block production string 12, prevent from producing in collision process mobile.
The both sides of described seal casinghousing 6 are separately installed with the plug 10 for shutoff casing annulus.May be used for injection in casing annulus by opening or closing plug 10, bleeding off pressure and the purposes such as observation.
After inject high-temperature steam in production string 12, when temperature acquires a certain degree, the top of production string 12 can drive slips body 9 and bore tight body 8 and move up, after production string 12 moves to certain distance, the continuation that step 14 in upper shell 1 can stop production string 12 moves, makes production string 12 stop at axial heat expansion like this.After stopping injects high-temperature steam in production string 12, namely production string 12 starts shrinkage, such production string 12 moves down, when being displaced downwardly to certain distance, namely production string 12 is sat tightly by the slips conical surface 91 on slips body 9 and sealing cone 61 phase on seal casinghousing 6, like this along with the continuation shrinkage of production string 12, production string 12 slowly will recover its prestressing force tension.Along with the loop cycle of oil recovery, steam injection, heat expansion, the shrinkage phenomenon of production string also occur repeatedly, at this moment boring tight body 8 can make slips body 9 hold production string 12 all the time tightly, avoid the slip insert 15 pairs of production strings 12 on slips body 9 repeatedly card hit and occur clamping pair lost efficacy phenomenon.
The utility model is by increasing the cone locking structure at the upper and lower two ends of slips body, can guarantee that slips body is held tightly with production string all the time, avoid the phenomenon that the repeatedly card of slip insert to production string top layer hits and the clamping pair that occurs lost efficacy, can application life of extending sleeve tube head.
Claims (4)
1. pre-stress type thermal extraction casing head, comprise the seal casinghousing be threaded with surface pipe, slips body is provided with between described seal casinghousing and production string, inner surface and the production string of described slips body are fastenedly connected, it is characterized in that: be provided with the diminishing sealing cone of internal diameter in the cavity of described seal casinghousing, the lower end of described slips body is provided with the slips conical surface matched with sealing cone;
The upper end of described slips body is connected by screw the tight body of cone for fastener watt body and production string;
The upper end of described seal casinghousing has been bolted upper shell, described upper shell is threaded with production tree, be sealed and installed with middle platen between described seal casinghousing and upper shell, described middle platen and production string, between surface pipe and seal casinghousing, form annular sealed space;
The step corresponding with production string external diameter is provided with in described upper shell.
2. pre-stress type thermal extraction casing head according to claim 1, is characterized in that: seal between described middle platen and seal casinghousing and be provided with joint ring, described middle platen and seal between upper shell and production string and be provided with sealing ring.
3. pre-stress type thermal extraction casing head according to claim 1 and 2, is characterized in that: the inner surface of the tight body of described cone is provided with the fastening conical surface suitable with the upper end external surface of slips body.
4. pre-stress type thermal extraction casing head according to claim 3, is characterized in that: the both sides of described seal casinghousing are separately installed with the plug for shutoff casing annulus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520493891.9U CN204729046U (en) | 2015-07-10 | 2015-07-10 | Pre-stress type thermal extraction casing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520493891.9U CN204729046U (en) | 2015-07-10 | 2015-07-10 | Pre-stress type thermal extraction casing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204729046U true CN204729046U (en) | 2015-10-28 |
Family
ID=54387405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520493891.9U Active CN204729046U (en) | 2015-07-10 | 2015-07-10 | Pre-stress type thermal extraction casing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204729046U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107039862A (en) * | 2017-04-28 | 2017-08-11 | 西南石油大学 | A kind of electrohydraulic mixed power composite cable input and output joint |
| CN108565585A (en) * | 2018-03-24 | 2018-09-21 | 西南石油大学 | A kind of electrohydraulic mixed power composite cable transition joint |
| CN108999585A (en) * | 2018-06-21 | 2018-12-14 | 中国石油天然气股份有限公司 | Thermal extraction casing head, hot exploitation system and completion method |
-
2015
- 2015-07-10 CN CN201520493891.9U patent/CN204729046U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107039862A (en) * | 2017-04-28 | 2017-08-11 | 西南石油大学 | A kind of electrohydraulic mixed power composite cable input and output joint |
| CN108565585A (en) * | 2018-03-24 | 2018-09-21 | 西南石油大学 | A kind of electrohydraulic mixed power composite cable transition joint |
| CN108999585A (en) * | 2018-06-21 | 2018-12-14 | 中国石油天然气股份有限公司 | Thermal extraction casing head, hot exploitation system and completion method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201908615U (en) | Delaminated steam injecting packer | |
| CN204729046U (en) | Pre-stress type thermal extraction casing head | |
| CN201053310Y (en) | Horizontal well sectional steam injection pipe column | |
| CN206830123U (en) | A kind of HTHP packer of band elasticity deblocking ratchet and balance bypass | |
| CN104213888B (en) | A kind of thick oil thermal extraction down-hole steam injection string | |
| CN104653129A (en) | Method for washing screw pumping well | |
| CN103470195A (en) | High-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod | |
| CN103015939A (en) | Protective device for thermal recovery well mouth | |
| CN201021612Y (en) | Separation device for dense SAGD steam driven gas injection well | |
| CN205025420U (en) | Combination effect layering vapour drives packer | |
| CN201934054U (en) | Novel bridge plug made of composite material | |
| CN201843567U (en) | Tubing plug capable of passing small hole | |
| CN203756115U (en) | Double-effect energy-saving thermal recovery packer | |
| CN202970610U (en) | Oil and gas well underground casing pipe packer rubber sleeve | |
| CN105178906A (en) | Layered steam driving packer with combination effect | |
| CN201306132Y (en) | Tripping and eccentric wear preventing centralizer of oil well pump | |
| CN203879448U (en) | Casing protected gas injection packer for CO2 injection well | |
| CN201396108Y (en) | Retrievable-type bridge plug | |
| CN2881069Y (en) | Prestressed well fixing ground anchor | |
| CN2622377Y (en) | Contact real type thermal stress compensator | |
| CN203022675U (en) | Thermal recovery well mouth protecting device | |
| CN201568015U (en) | Micro-ring gap interporosity flow blocker | |
| CN201705257U (en) | Expansion pipe running assorted tool for patching of horizontal well casings | |
| CN206785323U (en) | A kind of thermal compensation formula safety joint | |
| CN205477513U (en) | Steam injection packer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |