CN2833094Y - Expansion casing string - Google Patents
Expansion casing string Download PDFInfo
- Publication number
- CN2833094Y CN2833094Y CN 200520079576 CN200520079576U CN2833094Y CN 2833094 Y CN2833094 Y CN 2833094Y CN 200520079576 CN200520079576 CN 200520079576 CN 200520079576 U CN200520079576 U CN 200520079576U CN 2833094 Y CN2833094 Y CN 2833094Y
- Authority
- CN
- China
- Prior art keywords
- thread part
- internal
- external
- screw thread
- tubing string
- 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.)
- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model relates to the technical field of petroleum pipes, particularly an expansion casing string. The utility model aims to design the expansion casing string for solving the problems that in the prior art, the sealing performance of a casing string is reduced and can not meet operation requirements because external threads and internal threads are easily separated and structural integrity can not be ensured. In order to overcome the existent question of the prior art, the utility model has a technical scheme that the expansion casing string comprises more than two casing pipes. The utility model is characterized in that one end of one casing pipe is provided with a conical internal thread part, one end of the other casing pipe is provided with a conical external thread part and two adjacent casing pipes are engaged and connected with each other through the internal thread part and the external thread part. Both internal and external walls of the internal thread part, as well as both internal and external walls of the external thread part, are level to both internal and external walls of a pipe body, and the internal thread part and the external thread part are both provided with barb-shaped threads inside.
Description
Technical field:
The utility model relates to the OCTG technical field, particularly relates to a kind of expansion sleeve tubing string.
Background technology:
The expansion sleeve technology is a new technology in the petroleum works field, this technology is by carrying out the hole enlargement expansion to the sleeve pipe that is lowered in the oil gas well well, make it be affixed on outer shaft wall or sleeve pipe, thereby realize saving the purpose of well internal diameter size, can simplify the oil field casing programme, realize old well reparation, reduce the drilling cost.When needs are lowered to the casing length of well when bigger, need independent sleeve pipe is connected in the casing string lower going-into-well, and then whole casing string expanded, this syndeton that just requires sleeve pipe also is radially expandable, promptly require the connector of sleeve pipe in expansion process and after expanding, not to be damaged, will guarantee sealing load simultaneously.The oil well casing post adopts API (American Petroleum Institute (API)) standard thread joint to connect at present, the problem that it exists is: external screw thread very easily separates with internal thread, can't guarantee structural integrity, thereby cause casing string sealing performance appearance decline and can't satisfy instructions for use.
Summary of the invention:
The purpose of this utility model is a kind of expansion sleeve tubing string of design, very easily separates with internal thread to overcome the external screw thread that prior art exists, and can't guarantee structural integrity, thereby causes the casing string sealing performance to occur descending and can't satisfy the shortcoming of instructions for use.
For overcoming the problem that prior art exists, the technical solution of the utility model is: a kind of expansion sleeve tubing string, comprise plural sleeve pipe, its special character is, the end of a described sleeve pipe 1 is provided with conical internal thread portion, and the end of another sleeve pipe 7 is provided with conical external screw thread portion, and adjacent two sleeve pipes 1,7 are connected with a joggle by internal and external screw thread portion, the inside and outside wall of described internal and external screw thread portion is all concordant with the inside and outside wall of body, is provided with barb-shaped screw thread 4 in the internal and external screw thread portion.
The bearing surface angle of above-mentioned screw thread 4 is-3～-10 °, and the spigot surface angle is 10～25 °, screw thread tooth depth H, tapering 1: 16.
The root of above-mentioned external thread part is provided with the outer torque resistant shoulder 2 that cooperates with the internal thread part end face, and the root of described internal thread part is provided with the interior torque resistant shoulder 6 that cooperates with the external thread part end face.Strengthen sealing effectiveness.
Above-mentioned outer torque resistant shoulder 2 and interior torque resistant shoulder 6 are the right angle shoulder.Sealing effectiveness is better.
Termination one side and the internal thread part cooperation place of above-mentioned external thread part are provided with taper primary sealing area 5, and termination one side and the external thread part cooperation place of described internal thread part are provided with taper auxiliary seal face 3.
Above-mentioned sealing tapering is 1: 6.
Compared with prior art, the utility model has the advantages that:
1, can effectively guarantee structural integrity: the profile of tooth of screw thread is a fluking type, internal and external threads closely nibble and, the intensity height, not easily separated in the expansion process, can bear the most about 25% radial expansion volume and not lose its structure and sealing integrity;
2, good sealing effect: adopt conical seal (contact) face, carry out Seal Design with metal/metal; Outer torque shoulder and internal torque shoulder adopt 0 ° right angle torque shoulder, play the auxiliary seal effect;
3, perfect in shape and function: not only possess the basic linkage function of casing joint, be particularly suitable for hole enlargement simultaneously and expand;
4, processing is easy to use: owing to directly carry out screw thread processing on pipe, be no FJL Casing joint, do not need the pier bulk processing of butt joint position when this structure adds simultaneously, therefore processing is easier; Whole casing string is inside and outside concordant fully, and be easy to bloat tool and pass through, and help the expanding whole casing string in back and outer shaft wall or sleeve pipe applying, use more convenient.
Description of drawings:
Accompanying drawing is a structural representation of the present utility model.
Description of reference numerals is as follows:
The 1-sleeve pipe; The outer torque resistant shoulder of 2-; 3-auxiliary seal face; The 4-screw thread; The 5-primary sealing area; Torque resistant shoulder in the 6-; The 7-sleeve pipe.
The specific embodiment:
Below in conjunction with the embodiment accompanying drawing the utility model is described further.
Referring to accompanying drawing, a kind of expansion sleeve tubing string, comprise two sleeve pipes 1,7, the end of described sleeve pipe 1 is provided with conical internal thread portion, the end of sleeve pipe 7 is provided with conical external screw thread portion, two sleeve pipes 1,7 are connected with a joggle by internal and external screw thread portion, and the inside and outside wall of described internal and external screw thread portion is all concordant with the inside and outside wall of body, is set to barb-shaped screw thread 4 in the internal and external screw thread portion.Above the bearing surface angle of said screw thread be-9 °, the spigot surface angle is 25 °, screw thread tooth depth H, tapering 1: 16.Root at said external thread part is provided with torque resistant shoulder 2 outside the right angle that cooperates with the internal thread part end face, and the root of said internal thread part is provided with torque resistant shoulder 6 in the right angle that cooperates with the external thread part end face.Be provided with taper primary sealing area 5 in the termination of external thread part one side and internal thread part cooperation place, termination one side and the external thread part cooperation place of described internal thread part are provided with taper auxiliary seal face 3, and said sealing tapering is 1: 6.
Claims (6)
1, a kind of expansion sleeve tubing string, comprise plural sleeve pipe, it is characterized in that: the end of a described sleeve pipe (1) is provided with conical internal thread portion, the end of another sleeve pipe (7) is provided with conical external screw thread portion, adjacent two sleeve pipes (1,7) are connected with a joggle by internal and external screw thread portion, the inside and outside wall of described internal and external screw thread portion is all concordant with the inside and outside wall of body, is provided with barb-shaped screw thread (4) in the internal and external screw thread portion.
2, a kind of expansion sleeve tubing string as claimed in claim 1, it is characterized in that: the bearing surface angle of described screw thread (4) is-3～-10 °, the spigot surface angle is 10～25 °, screw thread tooth depth H, tapering 1: 16.
3, a kind of expansion sleeve tubing string as claimed in claim 1 or 2, it is characterized in that: the root of described external thread part is provided with the outer torque resistant shoulder (2) that cooperates with the internal thread part end face, and the root of described internal thread part is provided with the interior torque resistant shoulder (6) that cooperates with the external thread part end face.
4, a kind of expansion sleeve tubing string as claimed in claim 3 is characterized in that: described outer torque resistant shoulder (2) and interior torque resistant shoulder (6) are the right angle shoulder.
5, a kind of expansion sleeve tubing string as claimed in claim 4, it is characterized in that: termination one side and the internal thread part cooperation place of described external thread part are provided with taper primary sealing area (5), and termination one side and the external thread part cooperation place of described internal thread part are provided with taper auxiliary seal face (3).
6, a kind of expansion sleeve tubing string as claimed in claim 5, it is characterized in that: described sealing tapering is 1: 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079576 CN2833094Y (en) | 2005-10-25 | 2005-10-25 | Expansion casing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079576 CN2833094Y (en) | 2005-10-25 | 2005-10-25 | Expansion casing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2833094Y true CN2833094Y (en) | 2006-11-01 |
Family
ID=37197407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520079576 Expired - Fee Related CN2833094Y (en) | 2005-10-25 | 2005-10-25 | Expansion casing string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2833094Y (en) |
-
2005
- 2005-10-25 CN CN 200520079576 patent/CN2833094Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XI AN NATE PETROLEUM TECHNOLOGY CO.LTD. Free format text: FORMER OWNER: HAN YONG; PATENTEE Effective date: 20080718 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080718 Address after: 1503, block C, West electronic community software apartment, No. 18, electronic road, Shaanxi, Xi'an Province, 710065 Patentee after: Nate Petro Technology Co., Ltd., Xi'an Address before: 1503, block C, West electronic community software apartment, No. 18, electronic road, Shaanxi, Xi'an Province, 710065 Co-patentee before: Wang Ying Patentee before: Han Yong Co-patentee before: Gao Lianxin |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061101 Termination date: 20121025 |