CN202706941U - Anticorrosion high air sealing thread joint - Google Patents
Anticorrosion high air sealing thread joint Download PDFInfo
- Publication number
- CN202706941U CN202706941U CN 201220299009 CN201220299009U CN202706941U CN 202706941 U CN202706941 U CN 202706941U CN 201220299009 CN201220299009 CN 201220299009 CN 201220299009 U CN201220299009 U CN 201220299009U CN 202706941 U CN202706941 U CN 202706941U
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- China
- Prior art keywords
- shoulder
- external screw
- screw thread
- internal thread
- groove
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- Expired - Fee Related
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Abstract
The utility model relates to an anticorrosion high air sealing thread joint. A shoulder of an external thread joint comprises an external thread major shoulder and an external thread minor shoulder groove, a shoulder of an internal thread joint comprises an internal thread major shoulder groove and an internal thread minor shoulder, the external thread major shoulder is matched with the internal thread major shoulder groove, and the external thread minor shoulder groove is matched with the internal thread minor shoulder. The anticorrosion high air sealing thread joint solves the technical problems that high-stress regions are produced on the inner wall of a sealing surface of the shoulder of the external thread joint and the inner wall of a sealing surface of the shoulder of the internal thread joint under the condition of screwing and compression so that stress corrosion is caused, and shoulder separation under high load of stretching causes corrosion of a gap in an existing high air sealing special thread joint. The anticorrosion high air sealing thread joint is capable of having a function of protecting main sealing under load of the screwing, the compression and the stretching, and reducing the stress, and eliminating the corrosion of the gap.
Description
Technical field
The utility model coverage is the completion flow string, specifically, is that a kind of high pressure that guarantees contains the air-tight seal screw joint shoulder of the safe and efficient exploitation of corrosive medium gas well.
Background technology
The western part of China gas field has high temperature (greater than 140 ° of C), high pressure (greater than 90MPa), well depth (greater than 5000m), contains corrosive medium (CO
2, H
2S, CL
-) etc. characteristics because oil bushing threaded connector, bears stretchings in the different phase of completion construction, compresses in the down-hole, the effect of interior pressure and external pressure and crooked combined load was very easily lost efficacy.Thread gluing and gas leakage phenomenon have occured in the part tubing and casing of having used in hp-ht well at present, and the oil sleeve joint that trips out is observed, and the corrosion quantity of the screwed connection position generation that directly contact with fluid is maximum, and next is the shoulder position.
The high air-sealed special threaded joint shoulder that adopts at present is right angle or negative angle torque shoulder, twin-stage right angle shoulder etc., and shoulder groove and inside and outside pattern twin-stage shoulder are not all arranged.Under upper button and the contractive condition, the contact of internal and external threads shoulder produces the region of high stress at outside thread sealing surface inwall and internal thread shoulder inwall; Under the high tensile load, shoulder separates, and causes stress corrosion and crevice corrosion.Therefore, for guaranteeing the security development of hp-ht well, need high performance air-tight seal screw joint tank deck shoulder to improve.
Summary of the invention
In order to solve the high air-sealed special threaded joint of prior art, under upper button and contractive condition, produce the region of high stress at male connection shoulder sealing surface inwall and female adapter shoulder inwall, cause stress corrosion; Under the high tensile load, shoulder separates, the technical problem of the corrosion that gaps, and the utility model provides a kind of air-tight seal screw joint, can satisfy under upper button, compression and the tensile load, and the effect of protection primary seal reduces stress and eliminates crevice corrosion.
Technical solution of the present utility model is:
A kind of anticorrosive high air-tight seal screw joint, comprise male connection 1 and female adapter 2, be provided with the male connection shoulder in the described male connection, be provided with the female adapter shoulder in the described female adapter, its special character is: described male connection shoulder comprises external screw thread master shoulder 12, external screw thread slave station shoulder groove 11, described female adapter shoulder comprises internal thread master shoulder groove 22, internal thread slave station shoulder 21, described external screw thread master shoulder 12 matches with internal thread master shoulder groove 22, and described external screw thread slave station shoulder groove 11 matches with internal thread slave station shoulder 21.
Above-mentioned external screw thread slave station shoulder well width Lw=2mm～3mm, described external screw thread master land widths Dw=2mm～3mm, the distance H w of described external screw thread master shoulder end face and external screw thread slave station shoulder groove is 10mm～11mm, and the angle Qw of described external screw thread master shoulder inwall and horizontal negative direction is 80 °～90 °.
The utility model beneficial effect:
1, the incompressible and mistake moment of torsion of the utility model twin-stage shoulder, shoulder forms the effective sealing contact under upper button, stretching and bending load, stop the corrosive medium fluid to enter primary seal; Interior pressure effect lower shoulder stress decrease, contact improves.
2, the anticorrosive high air-tight seal screw joint of the utility model is controlled at 2～3mm with external screw thread slave station shoulder well width, the secondary land widths of internal thread, plays the effect of protecting moment of torsion and high compression; External screw thread slave station shoulder groove height, the secondary height of shoulder of internal thread are controlled at 10～11mm, can effectively protect primary seal and main shoulder; The angle Qw of external screw thread master shoulder inwall and horizontal negative direction is controlled at 80 °～90 °, and the angle Qn that the internal thread slave station is takeed on the horizontal positive direction of inwall is controlled at 80 °～90 °, prevents nipple primary seal thread gluing under upper button and combined load condition; External screw thread master land widths, internal thread master shoulder well width are controlled at 2～3mm, can under upper button and compressive load, protect primary seal.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Fig. 1 is the utility model male connection structural representation;
Fig. 2 is the utility model female adapter structural representation;
Fig. 3 is the state diagram of the utility model behind upper button;
Fig. 4 is that the utility model is in interior state diagram of depressing;
Fig. 5 is the state diagram under the interior pressure of the utility model and the tensile load effect.
The specific embodiment
A kind of anticorrosive high air-tight seal screw joint, comprise male connection 1 and female adapter 2, be provided with the male connection shoulder in the male connection, be provided with the female adapter shoulder in the female adapter, the male connection shoulder comprises external screw thread master shoulder 12, external screw thread slave station shoulder groove 11, the female adapter shoulder comprises internal thread master shoulder groove 22, internal thread slave station shoulder 21, external screw thread master shoulder 12 matches with internal thread master shoulder groove 22, and external screw thread slave station shoulder groove 11 matches with internal thread slave station shoulder 21.
External screw thread slave station shoulder well width Lw=2mm～3mm, external screw thread master land widths Dw=2mm～3mm, the distance H w of external screw thread master shoulder end face and external screw thread slave station shoulder groove is 10mm～11mm, and the angle Qw of external screw thread master shoulder inwall and horizontal negative direction is 80 °～90 °.
Can according to the requirement of concrete operating mode, select the air-tight seal screw joint sleeve pipe of this form of structure of different size.The processing of employing Digit Control Machine Tool.Box cupling and body be with grade of steel or a high grade of steel, internal thread copper facing thickness 〉=15um, the sclerosis of external screw thread bead blasted surfaces.The API thread compound is evenly smeared at two ends during upper button, clamping box cupling middle part, and factory's end adopts on the peak torque to be detained, and on-the-spot end adopts on the best torque to be detained.
Adopt finite element to carry out mechanical analysis to the casing joint of specification 177.8 * 10.36mm P110, show that under upper button, interior pressure and tensile load effect, the external screw thread shoulder can effectively contact with the internal thread shoulder; Even under the tensile load effect, external screw thread shoulder and internal thread shoulder are gapped, but form sealing because external screw thread shoulder inwall effectively contacts with internal thread shoulder groove itself, thereby have stoped the liquid inflow, and the protection primary seal is not corroded.
Claims (2)
1. anticorrosive high air-tight seal screw joint, comprise male connection (1) and female adapter (2), be provided with the male connection shoulder in the described male connection, be provided with the female adapter shoulder in the described female adapter, it is characterized in that: described male connection shoulder comprises external screw thread master shoulder (12), external screw thread slave station shoulder groove (11), described female adapter shoulder comprises internal thread master shoulder groove (22), internal thread slave station shoulder (21), described external screw thread master shoulder (12) matches with internal thread master shoulder groove (22), and described external screw thread slave station shoulder groove (11) matches with internal thread slave station shoulder (21).
2. a kind of anticorrosive high air-tight seal screw joint shoulder according to claim 1, it is characterized in that: described external screw thread slave station shoulder well width (Lw) is 2mm～3mm, described external screw thread master land widths (Dw) is 2mm～3mm, the distance (Hw) of described external screw thread master shoulder end face and external screw thread slave station shoulder groove is 10mm～11mm, and the angle (Qw) of described external screw thread master shoulder inwall and horizontal negative direction is 80 °～90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299009 CN202706941U (en) | 2012-06-25 | 2012-06-25 | Anticorrosion high air sealing thread joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299009 CN202706941U (en) | 2012-06-25 | 2012-06-25 | Anticorrosion high air sealing thread joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202706941U true CN202706941U (en) | 2013-01-30 |
Family
ID=47587250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220299009 Expired - Fee Related CN202706941U (en) | 2012-06-25 | 2012-06-25 | Anticorrosion high air sealing thread joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202706941U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704865A (en) * | 2012-06-25 | 2012-10-03 | 西安三环科技开发总公司 | Corrosion-resistant and high-tightness screw joint |
-
2012
- 2012-06-25 CN CN 201220299009 patent/CN202706941U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704865A (en) * | 2012-06-25 | 2012-10-03 | 西安三环科技开发总公司 | Corrosion-resistant and high-tightness screw joint |
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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: 20130130 Termination date: 20140625 |
|
| EXPY | Termination of patent right or utility model |