CN203614052U - Self-locking threaded joint - Google Patents
Self-locking threaded joint Download PDFInfo
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- CN203614052U CN203614052U CN201320785541.0U CN201320785541U CN203614052U CN 203614052 U CN203614052 U CN 203614052U CN 201320785541 U CN201320785541 U CN 201320785541U CN 203614052 U CN203614052 U CN 203614052U
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- internal thread
- screw thread
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Abstract
The utility model provides a self-locking threaded joint to solve the problems that at present, a joint of an oil casing is an API circular threaded joint or a buttress joint, the threaded joint has the advantages of mature technology, easiness in machining and detection and fine interchangeability, with exploration and development of petroleum and natural gas, the environment of oil and gas production is increasingly severe, higher requirements on the performances of the oil casing such as tension resistance, pressure resistance and bending resistance are proposed, but a common API threaded joint is low in connecting strength and poor in sealing performance and difficultly meets the performance requirements. By the aid of torque steps, most torques act on the torque steps, so that the connecting strength of the self-locking threaded joint is improved, the torque steps are designed by the aid of negative angles, the bending resistance of the joint is also improved, both an external threaded conical surface and an internal threaded conical surface are made of metal, the sealing performance of the joint is enhanced, and scratched surfaces are easily restored.
Description
Technical field
The utility model belongs to oil well pipe thread link technique apparatus field, is specially a kind of self-locking nipple.
Background technology
At present, normally API knuckle screw joint or the partially trapezoidal joint of joint that tubing and casing adopts, the advantage of this nipple is technology maturation, easily processing and detection, interchangeability is good, but along with the development of petroleum natural gas exploration, the environment that oil-gas mining faces is more and more severe, main manifestations is that Oil/gas Well is more and more darker, geological conditions becomes increasingly complex, and the performances such as tension to petroleum casing pipe, resistance to compression, bending resistance need put forward higher requirement, but common API is threaded, intensity is low, poor sealing performance, is difficult to meet above-mentioned performance requirement.
Summary of the invention
In order to address the above problem, the utility model proposes a kind of self-locking nipple, adopt after the utility model, can effectively increase the bonding strength of oil sleeve joint, and make better tightness, more can be adapted at the petroleum natural gas exploration under complex environment.
A kind of self-locking nipple, its technical scheme is such: it comprises two tubing and casing and internal thread connecting piece, the end of described tubing and casing has external screw thread, on described internal thread connecting piece, have internal thread, described external screw thread from end to head end enlarging gradually, described in two ends, internal thread is from arranging to corresponding expanding end from described internal thread connecting piece middle part respectively, the end external screw thread of the corresponding described tubing and casing that connects correspondence position of corresponding end internal thread of described internal thread connecting piece, the axis of described tubing and casing and the axis of described internal thread connecting piece overlap mutually, it is characterized in that: be provided with external screw thread torque shoulder in the outermost end of described tubing and casing, be provided with internal thread torque shoulder at the inner terminal of described internal thread, described external screw thread torque shoulder and described internal thread torque shoulder are close under tightening state, the front end face of described external screw thread torque shoulder is external screw thread front end face, acute angle angle between the vertical line of described external screw thread front end face and described axis is external screw thread angle C, described external screw thread front end face exceeds it away from a described externally threaded side near a described externally threaded side, the front end face of described internal thread torque shoulder is internal thread inner face, the acute angle angle of the vertical line between described internal thread inner face and described axis is internal thread angle D, described internal thread inner face near a side of described internal thread lower than it side away from described internal thread, described C is consistent with the angle of described D, scope is 3 °～20 °, described external screw thread front end face is connected by the transition of external screw thread taper seat with described external screw thread, described internal thread inner face is connected by the transition of internal thread taper seat with described internal thread, the angle of described external screw thread taper seat and described axis is E, the angle of described internal thread taper seat and described axis is F, described external screw thread taper seat, described internal thread taper seat position are corresponding, described E, F angle are consistent, and scope is 20 °～50 °.
It is further characterized in that: the acute angle angle of the vertical line of the screw thread bearing surface of described screw thread and the axis of described tubing and casing is A, and the scope of described A is 3 °～4 °; The acute angle angle of the vertical line of the screw thread spigot surface of described screw thread and the axis of described tubing and casing is B, described C and scope be 5 °～30 °;
Described external screw thread and described internal thread are hook-type screw thread;
Between described external screw thread front end face and described external screw thread taper seat, be connected by orthodrome transition, between described internal thread inner face and described internal thread taper seat, be connected by orthodrome transition.
Adopt after the utility model, because the outermost end of tubing and casing and the inner terminal of internal thread have adopted moment of torsion step, moment of torsion major part acts on moment of torsion step like this, thereby has improved its bonding strength, and moment of torsion step adopts negative angle design, so also improve the bending resistance of joint; External screw thread taper seat and internal thread taper seat all adopt metal, have not only increased the sealing of joint, and make to be easily repaired after galled spots, have reduced maintenance cost; The large end of internal and external screw thread adopts the processing mode of " withdrawing completely ", has eliminated internal and external screw thread spinner and has been engaged in the stress that the constraint of withdrawing angle place forms and concentrates, and the design of screw thread also makes easily upper button of joint, and fast and easy is installed.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the enlarged drawing of the utility model at I place;
Fig. 3 is the enlarged drawing of the utility model at II place;
Fig. 4 is screw thread enlarged drawing of the present utility model.
The specific embodiment
See Fig. 1～Fig. 4, a kind of self-locking nipple, it comprises two tubing and casing 1 and internal thread connecting piece 2, the end of tubing and casing 1 has external screw thread 3, on internal thread connecting piece 2, have internal thread 4, external screw thread 3 and internal thread 4 are hook-type screw thread, external screw thread 3 from end to head end enlarging gradually, two ends internal thread 4 is from arranging from internal thread connecting piece 2 middle parts to corresponding expanding end respectively, the end external screw thread of the corresponding tubing and casing 1 that connects correspondence position of corresponding end internal thread of internal thread connecting piece 2, the axis 8 of the axis of tubing and casing 1 and internal thread connecting piece 2 overlaps mutually, be provided with external screw thread torque shoulder 5 in the outermost end of tubing and casing 1, be provided with internal thread torque shoulder 6 at the inner terminal of internal thread 4, external screw thread torque shoulder 5 and internal thread torque shoulder 6 positions are close under tightening state, the front end face of external screw thread torque shoulder 5 is external screw thread front end face 7, acute angle angle between the vertical line of external screw thread front end face 7 and axis 8 is external screw thread angle C, external screw thread front end face 7 exceeds its side away from external screw thread 3 near a side of external screw thread 3, the front end face of internal thread torque shoulder 6 is internal thread inner face 9, the acute angle angle of the vertical line between internal thread inner face 9 and axis 8 is internal thread angle D, internal thread inner face 9 near a side of internal thread 4 lower than it side away from internal thread, external screw thread angle C is consistent with the angle of internal thread angle D, C, D is 20 °, external screw thread front end face 7 is connected by 10 transition of external screw thread taper seat with external screw thread 3, internal thread inner face 9 is connected by 11 transition of internal thread taper seat with internal thread 4, external screw thread taper seat 10 is E with the angle of axis 8, internal thread taper seat 11 is F with the angle of axis 8, the position of external screw thread taper seat 10, internal thread taper seat 11 is corresponding, E, F angle are consistent, be 20 °, between external screw thread front end face 7 and external screw thread taper seat 10, be connected by orthodrome transition, between internal thread inner face 9 and internal thread taper seat 11, be connected by orthodrome transition, the screw thread bearing surface 12 of screw thread is A with the acute angle angle of the axis 8 of tubing and casing, and A is 3 °, the screw thread spigot surface 13 of screw thread is B with the acute angle angle of the vertical line of the axis 8 of tubing and casing, and B is 30 °.
Claims (4)
1. a self-locking nipple, it comprises two tubing and casing and internal thread connecting piece, the end of described tubing and casing has external screw thread, on described internal thread connecting piece, have internal thread, described external screw thread from end to head end enlarging gradually, described in two ends, internal thread is from arranging to corresponding expanding end from described internal thread connecting piece middle part respectively, the end external screw thread of the corresponding described tubing and casing that connects correspondence position of corresponding end internal thread of described internal thread connecting piece, the axis of described tubing and casing and the axis of described internal thread connecting piece overlap mutually, it is characterized in that: be provided with external screw thread torque shoulder in the outermost end of described tubing and casing, be provided with internal thread torque shoulder at the inner terminal of described internal thread, described external screw thread torque shoulder and described internal thread torque shoulder are close under tightening state, the front end face of described external screw thread torque shoulder is external screw thread front end face, acute angle angle between the vertical line of described external screw thread front end face and described axis is external screw thread angle C, described external screw thread front end face exceeds it away from a described externally threaded side near a described externally threaded side, the front end face of described internal thread torque shoulder is internal thread inner face, the acute angle angle of the vertical line between described internal thread inner face and described axis is internal thread angle D, described internal thread inner face near a side of described internal thread lower than it side away from described internal thread, described C is consistent with the angle of described D, scope is 3 °～20 °, described external screw thread front end face is connected by the transition of external screw thread taper seat with described external screw thread, described internal thread inner face is connected by the transition of internal thread taper seat with described internal thread, the angle of described external screw thread taper seat and described axis is E, the angle of described internal thread taper seat and described axis is F, described external screw thread taper seat, described internal thread taper seat position are corresponding, described E, F angle are consistent, and scope is 20 °～50 °.
2. a kind of self-locking nipple according to claim 1, is characterized in that: the acute angle angle of the vertical line of the screw thread bearing surface of described screw thread and the axis of described tubing and casing is A, and the scope of described A is 3 °～4 °; The acute angle angle of the vertical line of the screw thread spigot surface of described screw thread and the axis of described tubing and casing is B, described C and scope be 5 °～30 °.
3. a kind of self-locking nipple according to claim 1 and 2, is characterized in that: described external screw thread and described internal thread are hook-type screw thread.
4. a kind of self-locking nipple according to claim 1 and 2, it is characterized in that: between described external screw thread front end face and described external screw thread taper seat, be connected by orthodrome transition, between described internal thread inner face and described internal thread taper seat, be connected by orthodrome transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320785541.0U CN203614052U (en) | 2013-12-04 | 2013-12-04 | Self-locking threaded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320785541.0U CN203614052U (en) | 2013-12-04 | 2013-12-04 | Self-locking threaded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203614052U true CN203614052U (en) | 2014-05-28 |
Family
ID=50766704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320785541.0U Expired - Fee Related CN203614052U (en) | 2013-12-04 | 2013-12-04 | Self-locking threaded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203614052U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
| CN109774375A (en) * | 2019-01-24 | 2019-05-21 | 中北大学 | A kind of heavy vehicles new structure aluminum-alloy wheel |
| CN116398060A (en) * | 2023-05-15 | 2023-07-07 | 山东高原油气装备有限公司 | High leakproofness petroleum casing pipe joint with self-locking function |
-
2013
- 2013-12-04 CN CN201320785541.0U patent/CN203614052U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
| CN109774375A (en) * | 2019-01-24 | 2019-05-21 | 中北大学 | A kind of heavy vehicles new structure aluminum-alloy wheel |
| CN116398060A (en) * | 2023-05-15 | 2023-07-07 | 山东高原油气装备有限公司 | High leakproofness petroleum casing pipe joint with self-locking function |
| CN116398060B (en) * | 2023-05-15 | 2023-08-18 | 山东高原油气装备有限公司 | High leakproofness petroleum casing pipe joint with self-locking function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20140528 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20140528 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 Termination date: 20141204 |
|
| EXPY | Termination of patent right or utility model |