CN201723166U - Oil casing with spherical stepped sealing surface and unequally spaced threads - Google Patents
Oil casing with spherical stepped sealing surface and unequally spaced threads Download PDFInfo
- Publication number
- CN201723166U CN201723166U CN2010202332441U CN201020233244U CN201723166U CN 201723166 U CN201723166 U CN 201723166U CN 2010202332441 U CN2010202332441 U CN 2010202332441U CN 201020233244 U CN201020233244 U CN 201020233244U CN 201723166 U CN201723166 U CN 201723166U
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- China
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- sealing surface
- threads
- spherical
- casing
- screw thread
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- 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
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model relates to an oil casing with a spherical stepped sealing surface and unequally spaced threads, which comprises a pipe body (1) and threads (4), wherein the threads are processed on the outside wall of the pipe body (1) at unequal intervals, a torsion ledge (2) is arranged on the top of the pipe body (1), a step (3) is arranged at the torsion ledge (2), and the step (3) has a spherical structure and is a sealing surface. The oil casing with the spherical stepped sealing surface and unequally spaced threads has better sealing effect, and the threads are not damaged easily.
Description
(1) technical field
The utility model relates to a kind of tubing and casing, especially relates to a kind of tubing and casing that has spherical step sealing surface and reducing-pitch thread.
(2) background technology
The tubing and casing of oil field use at present adopts the API screw thread to connect mostly.The API screw thread is because technology maturation, be easy to processing, advantages such as cost is lower, use more extensive always, but the API screw thread is owing to the reason of structure design aspect, there are many defectives that are difficult to overcome, as the low (round thread especially of bonding strength, bonding strength be body 60～80%), sealing performance is unreliable, last button control is difficult, joint stress level height, anticorrosion stress-resistant poor performance etc., simultaneously, the API screw thread of spaced set of bearing sealing function produces and rubs easily with between the shape of threads box cupling inwall in connection procedure, cause screw thread impaired, thereby not only influence the connection effect of tubing and casing and its sealing performance is also had bigger influence, cause the use of API screw thread to be restricted.Because oil gas well drilling development of technology, drilling environment are harsh day by day, also higher to the requirement of tubing and casing, common API nipple oil, sleeve pipe can't satisfy instructions for use, and the demand of special thread oil, sleeve pipe will significantly increase.
(3) summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of have better sealing effectiveness and the non-damageable tubing and casing that has spherical step sealing surface and reducing-pitch thread of screw thread are provided.
The purpose of this utility model is achieved in that a kind of tubing and casing that has spherical step sealing surface and reducing-pitch thread, include body and screw thread, on the lateral wall that is machined in body that described screw thread is not equidistant, described body top is a torque shoulder, described torque shoulder place is provided with step, described step is a spherical structure, and described step is a sealing surface.
The beneficial effects of the utility model are:
During use,, only need tubing and casing is screwed in the box cupling that is complementary with it, utilize the metal/metal hermetically-sealed construction to realize sealing, make tubing and casing have higher sealing effectiveness owing to be provided with the step sealing surface; Simultaneously owing to adopted not equidistant screw thread, when being rotatably connected, screw thread not can and shape of threads box cupling inwall between produce friction, thereby effectively protected the screw thread of tubing and casing.
(4) description of drawings
Fig. 1 is the utility model structural representation.
Among the figure:
(5) specific embodiment
Referring to Fig. 1, the utility model relates to a kind of tubing and casing that has spherical step sealing surface and reducing-pitch thread, include body 1 and screw thread 4, on the not equidistant lateral wall that is machined in body 1 of described screw thread 4, described body 1 top is a torque shoulder 2, described torque shoulder 2 places are provided with step 3, and described step 3 is a spherical structure, and described step 3 is a sealing surface.
Claims (1)
1. tubing and casing that has spherical step sealing surface and reducing-pitch thread, it is characterized in that: described tubing and casing includes body (1) and screw thread (4), on the not equidistant lateral wall that is machined in body (1) of described screw thread (4), described body (1) top is a torque shoulder (2), described torque shoulder (2) locates to be provided with step (3), described step (3) is a spherical structure, and described step (3) is a sealing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202332441U CN201723166U (en) | 2010-06-18 | 2010-06-18 | Oil casing with spherical stepped sealing surface and unequally spaced threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202332441U CN201723166U (en) | 2010-06-18 | 2010-06-18 | Oil casing with spherical stepped sealing surface and unequally spaced threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201723166U true CN201723166U (en) | 2011-01-26 |
Family
ID=43491485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202332441U Expired - Fee Related CN201723166U (en) | 2010-06-18 | 2010-06-18 | Oil casing with spherical stepped sealing surface and unequally spaced threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201723166U (en) |
-
2010
- 2010-06-18 CN CN2010202332441U patent/CN201723166U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20150618 |
|
| EXPY | Termination of patent right or utility model |