CN202645463U - Thread gluing resistant two-stage gas seal screwed joint - Google Patents
Thread gluing resistant two-stage gas seal screwed joint Download PDFInfo
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- CN202645463U CN202645463U CN 201220222865 CN201220222865U CN202645463U CN 202645463 U CN202645463 U CN 202645463U CN 201220222865 CN201220222865 CN 201220222865 CN 201220222865 U CN201220222865 U CN 201220222865U CN 202645463 U CN202645463 U CN 202645463U
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Abstract
The utility model relates to a thread gluing resistant two-stage gas seal screwed joint which comprises internal threads and external threads, and the internal threads and the external threads are connected in a sleeved mode. The internal threads comprise internal thread one-stage spherical seals, internal thread conical surface seals and internal thread two-stage spherical seals. The external threads comprise external thread one-stage spherical seals, external thread conical surface seals and external thread two-stage spherical seals, the inner spherical radius RN1of the internal thread one-stage spherical seals is 0.4-2 millimeters, and the spherical radius RW1 of the external thread one-stage spherical seals is 1-3 millimeters; and the conical surface transition of the internal thread conical surface seals is 1/6-1/13. The thread gluing resistant two-stage gas seal screwed joint solves the problems that defects of thread gluing and gas leakage are easy to appear in an existing oil casing joint, contact length on the condition of screw-on is short, and the thread gluing can be avoided; and two-stage main seals are formed with the increase of internal pressure and tensile load, and at the same time, contact pressure and stress of end portion one-stage seals are decreased, and the stress corrosion of an inner pipe wall can be effectively resisted.
Description
Technical field
The scope that the present invention relates to is the completion flow string, specifically, is that a kind of high pressure that guarantees contains the nipple 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 55MPa), well depth (greater than 3000m) and contains the characteristics such as corrosive medium (CO2, H2S, CL-), because oil bushing threaded connector is in the different phase of completion construction, bear stretching, compression 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 oil sleeve joint that has used in hp-ht well at present, and the oil sleeve joint that trips out is observed, and discovery is maximum with the corrosion quantity that the screwed connection position that fluid directly contacts occurs, and is the shoulder position secondly.
The reason that said circumstances why occurs by analysis is as follows:
1, existing tubing and casing adopts sphere the line contact to curved surface contacts with the face of the conical surface to the conical surface to the conical surface or curved surface, all can produce local high contact, easily produces the thread gluing phenomenon.
2, under the combined load operating mode, with the increase contact raising of interior pressure, under the tensile load condition, the primary seal contact descends, and easily produces stress corrosion and hermetic seal leakage phenomenon.
Summary of the invention
Be prone to the defective of thread gluing, Leakage Gas in order to solve existing oil sleeve joint, the utility model provides a kind of anti-stick button two-stage air-tight seal screw joint.
Technical solution of the present utility model:
Anti-stick button two-stage air-tight seal screw joint, comprise the internal thread and the external screw thread that connect together, described internal thread comprises internal thread one-level ball face sealing, internal thread conical surface seal and internal thread secondary ball face sealing, described external screw thread comprises external screw thread one-level ball face sealing, external screw thread conical surface seal and external screw thread secondary ball face sealing, it is characterized in that: the inner sphere radius RN1 of the one-level ball face sealing of described internal thread is 0.4～2mm, and the spherical radius RW1 of described externally threaded one-level ball face sealing is 1～3mm; The conical surface transition of described internal thread conical surface seal is 1/6～1/13, the conical surface transition of described external screw thread conical surface seal is 1/6～1/13, the spherical radius of described internal thread secondary ball face sealing is 150～300mm, and the spherical radius of described external screw thread secondary ball face sealing is 150～300mm.
Above-mentioned internal thread copper facing thickness 〉=15um, described external screw thread bead blasted surfaces sclerosis.
The utlity model has following advantage:
1, the anti-stick button two-stage of the utility model hermetic seal joint sealed junction comprises one-level level sphere/ball face sealing, conical surface transition auxiliary seal and secondary sphere/sphere primary seal.
2, contact length is short under the upper profile spare, can avoid thread gluing; Increase formation secondary primary seal with interior pressure and tensile load, end primary seal contact and stress decrease can effectively be resisted inner tubal wall stress corrosion simultaneously.
Description of drawings
Fig. 1 is the external thread structure schematic diagram of the anti-stick button two-stage of the utility model figure air-tight seal screw joint;
Fig. 2 is the female thread structure schematic diagram of the anti-stick button two-stage of the utility model figure air-tight seal screw joint.
The specific embodiment
As shown in Figure 1 and Figure 2, anti-stick button two-stage air-tight seal screw joint, comprise the internal thread and the external screw thread that connect together, internal thread comprises internal thread one-level ball face sealing, internal thread conical surface seal and internal thread secondary ball face sealing, external screw thread comprises external screw thread one-level ball face sealing, external screw thread conical surface seal and external screw thread secondary ball face sealing, the inner sphere radius RN1 of the one-level ball face sealing of internal thread is 0.4～2mm, and the spherical radius RW1 of externally threaded one-level ball face sealing is 1～3mm; The conical surface transition of internal thread conical surface seal is 1/6～1/13, and the conical surface transition of described external screw thread conical surface seal is 1/6～1/13, and the spherical radius of internal thread secondary ball face sealing is 150～300mm, and the spherical radius of external screw thread secondary ball face sealing is 150～300mm.
Can according to the requirement of concrete operating mode, select the sealing Special threading connector sleeve pipe 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.
Table 1 hermetically-sealed construction forms and function
Claims (2)
1. anti-stick button two-stage air-tight seal screw joint, comprise the internal thread and the external screw thread that connect together, described internal thread comprises internal thread one-level ball face sealing, internal thread conical surface seal and internal thread secondary ball face sealing, described external screw thread comprises external screw thread one-level ball face sealing, external screw thread conical surface seal and external screw thread secondary ball face sealing, it is characterized in that: the inner sphere radius RN1 of the one-level ball face sealing of described internal thread is 0.4～2mm, and the spherical radius RW1 of described externally threaded one-level ball face sealing is 1～3mm; The conical surface transition of described internal thread conical surface seal is 1/6～1/13, the conical surface transition of described external screw thread conical surface seal is 1/6～1/13, the spherical radius of described internal thread secondary ball face sealing is 150～300mm, and the spherical radius of described external screw thread secondary ball face sealing is 150～300mm.
2. anti-stick button two-stage air-tight seal screw joint according to claim 1 is characterized in that: described internal thread copper facing thickness 〉=15um, described external screw thread bead blasted surfaces sclerosis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220222865 CN202645463U (en) | 2012-05-17 | 2012-05-17 | Thread gluing resistant two-stage gas seal screwed joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220222865 CN202645463U (en) | 2012-05-17 | 2012-05-17 | Thread gluing resistant two-stage gas seal screwed joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202645463U true CN202645463U (en) | 2013-01-02 |
Family
ID=47414585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220222865 Expired - Lifetime CN202645463U (en) | 2012-05-17 | 2012-05-17 | Thread gluing resistant two-stage gas seal screwed joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202645463U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527110A (en) * | 2013-09-18 | 2014-01-22 | 西安三环科技开发总公司 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
-
2012
- 2012-05-17 CN CN 201220222865 patent/CN202645463U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527110A (en) * | 2013-09-18 | 2014-01-22 | 西安三环科技开发总公司 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |