CN201982024U - Casing gas seal screwed nipples for gas well - Google Patents
Casing gas seal screwed nipples for gas well Download PDFInfo
- Publication number
- CN201982024U CN201982024U CN2011200379274U CN201120037927U CN201982024U CN 201982024 U CN201982024 U CN 201982024U CN 2011200379274 U CN2011200379274 U CN 2011200379274U CN 201120037927 U CN201120037927 U CN 201120037927U CN 201982024 U CN201982024 U CN 201982024U
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- China
- Prior art keywords
- sealing
- seal
- gas well
- torque shoulder
- conical surface
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- Expired - Fee Related
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- 210000002445 nipple Anatomy 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 238000004026 adhesive bonding Methods 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 5
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
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Abstract
The utility model relates to casing gas seal screwed nipples for a gas well, which comprise screwed nipples, a torque shoulder and a main seal, wherein the torque shoulder is arranged between the screwed nipples; the main seal comprises a first seal close to the torque shoulder and a second seal close to the screwed nipples; the first seal is in a cone/cone seal structure, and the second seal is in a cone/spherical seal structure; and the torque shoulder is -14.5 to -5.5 degrees. With the adoption of the casing gas seal screwed nipples for the gas well, the technical problems of easiness in thread gluing, unstable sealing, failure of the shoulder, corrosion and leakage of the shoulder and the like easily occurring in the conventional gas well string gas well screwed nipple can be solved, and the casing gas seal screwed nipples for the gas well has good sealing integrity, and can ensure the integrity of the structure and the sealing of the casing string.
Description
Technical field
The utility model relates to a kind of natural gas well casing thread connection, relates in particular to a kind of sleeve pipe special thread joint of realizing the safe working of HTHP gas well.
Technical background
In the natural petroleum gas field, the sleeve pipe that is adopted is twisted by screw thread and is connect the casing string of forming in succession, and screw thread is the weakest link in the tubing string, and its structural integrity, sealing integrity and reliability have a strong impact on the safety in production and the tubing string life-span in oil field.
The main button-type of hermetic seal special thread is VAM, 3SB, NSCC, BGC, WSP, TPCQ, APIBC button etc. both at home and abroad.
The gas field has high temperature, high pressure contains characteristics such as corrosive medium, because the gas bushing nipple, bears stretching, compression in the different phase of completion construction 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 taken place in the part gas bushing of having used in hp-ht well at present, and the gas bushing 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.Therefore, for guaranteeing the security development of hp-ht well, need high performance special thread joint gas bushing.
Contain the corrosive medium gas well at high temperature, high pressure, the hermetic seal technical measures of mainly taking at present are to adopt metal/metal sealing and torque shoulder to cooperate, be generally two-stage shoulder one-level primary seal, hermetically-sealed construction has sphere/curved surface, the conical surface/conical surface, sphere/conical surface, cylinder/cylinder, sphere/cylinder; General 90 ° of torque shoulder ,-15 ° of torque shoulder and-20 ° of torque shoulder of adopting of shoulder.
The subject matter that existing hermetic seal technology exists:
1. the conical surface/conical surface, cylinder/sealing has contact pressure peak value height, long, the average low characteristics of contact pressure of contact length to cylinder, so there is the technical problem of easy thread gluing.
2. sphere/conical surface, sphere/cylinder sealing have the advantages that the contact pressure peak value is low, contact length is low, average contact pressure is high, so there is the unsettled technical problem of sealing.
3. adopt 90 ° of torque shoulder, easily separated at the tensile load lower shoulder.
4. adopt-15 ° of torque shoulder and-20 ° of torque shoulder, shear failure easily takes place and lost efficacy in the compressive load lower shoulder.
5, the shoulder corrosion phenomenon all appears in existing various hermetic seals easily, causes sealing leak.
Summary of the invention
Technical problems such as thread gluing appears in existing gas well tubing string air-tight seal screw joint easily, sealing is unstable, shoulder lost efficacy in order to solve, shoulder corrosion leakage the utility model proposes a kind of gas well sleeve pipe air-tight seal screw joint.
Technical solution of the present utility model is:
A kind of gas well sleeve pipe air-tight seal screw joint, comprise nipple, be arranged on torque shoulder 1 and primary seal between nipple, its special character is: described primary seal comprises near first sealing 2 of torque shoulder 1 and second sealing 3 of close nipple; Described first is sealed into the conical surface/conical surface seal structure, and described second is sealed into the conical surface/ball face sealing structure; Described torque shoulder is-4.5 °～-5.5 ° torque shoulder.
Above-mentioned torque shoulder is-5 ° of torque shoulder.
The tapering of the conical surface of above-mentioned first sealing is 1: 6～1: 12, and the tapering of the conical surface of described second sealing equates with the conical surface of first sealing; The circular arc R radius of the sphere of described second sealing is 60～90mm.
Above-mentioned primary seal length H is 3～6mm; Described torque shoulder width L is 4～6mm.
Above-mentioned joint screw thread is the API buttress thread.
The screw thread spigot surface angle [alpha] of above-mentioned API buttress thread
1It is 10 °～45 °; Screw thread bearing surface angle [alpha]
2It is 3 °～-30 °.
The beneficial effect that the utility model had:
1, the utility model adopts the form of structure of-5 ° of torque shoulder and two-stage sealing,-5 ° of torque shoulder have anti-moment of torsion and incompressible effect, the two-stage sealing can prevent thread gluing and guarantee sealing integrity, thereby button back shoulder has lower combined stresses/contact stress in the assurance, can prevent the stress corrosion and the incompressible Problem of Failure of shoulder.The conical surface/the conical surface and the conical surface/sphere two-stage sealing can guarantee to have good sealing integrity under combined load (interior pressure and tensile load) effect, obviously is better than the single-stage hermetically-sealed construction that adopts at present.
2, the utility model special thread joint coupling can satisfy the needs that high temperature, high pressure contain harsh operating mode combined load such as corrosive medium, has anti-stick button and cross to be connected under the performance, combined load of moment of torsion and sealing performance, junction inwall have low combined stresses.Compression efficiency (40%) and stretching such as reach at body, do not leak under VME=95% material yield strength envelope load-up condition, guarantee the structure and the sealing integrity of casing string.
3, the utility model can be used for high temperature, high-pressure gas well deep-well, ultradeep well, directional well and horizontal well.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the schematic diagram that concerns of the utility model each several part;
Fig. 3 is sealing surface and the circular bead surface stress envelope behind the last button;
Fig. 4 is interior pressure effect lower sealing surface and circular bead surface stress envelope;
Fluid penetrated the length schematic diagram of sealing when Fig. 5 was stretched to inefficacy for interior pressure (73MPa) adds;
Fig. 6 is combined load hermetic seal test load(ing) point schematic diagram;
Reference numeral is: the 1-torque shoulder; 2-first sealing; 3-second sealing; 4-oil storage escape; 5-screw thread bearing surface; 6-screw thread spigot surface; α
0-torque shoulder inclination angle; α
1-screw thread spigot surface angle; α
2-screw thread bearing surface angle; H-primary seal length; The arc radius of the sphere of R-second sealing; L-torque shoulder width; H-oil storage escape height.
The specific embodiment
The utility model nipple is made up of-5 ° of angle torque shoulder, two-stage primary sealing area (conical surface the conical surface, the conical surface sphere), oil storage and escape, flank.The reverse angle of shoulder is-5 °; Screw thread spigot surface angle is 10 °～45 °; Screw thread bearing surface angle is 3 °～-30 °; Primary seal length is 3mm～6mm, and tapering is 1: 6～1: 12; The primary seal arc radius is 60mm～90mm; Primary seal land widths 4mm～6mm; Oil storage escape height is 6mm～11mm.
Joint screw thread of the present utility model is adjusted the middle footpath of internal and external threads and just can be finished based on the API buttress thread, and need not change all the other parameters of inside and outside joint screw thread.
The function of the utility model each several part:
1, torque shoulder: on anchor the position, resisted moment of torsion, reduce shoulder place stress and concentrate;
2, first sealing (conical surface/conical surface): increase sealing contact length and stability;
3, second sealing (conical surface/sphere): under Action of Combined Loads, keep seal contact pressure;
4, oil storage and escape function: store unnecessary thread compound and internal thread machining withdrawing;
5, bearing surface (angle [alpha]
2Less than 3 °) function: improve stretch-proof and crooked ability;
6, spigot surface (angle [alpha]
1Greater than 10 °) function: detain not thread gluing in the assurance.
The utility model can be selected this special thread sleeve pipe of different size for use according to the requirement of concrete operating mode.Add man-hour, at first process the internal and external threads sealing surface, process torque shoulder then, reprocess helicitic texture at last.The same grade of steel of box cupling and body, internal thread copper facing or phosphate coating 20um are thick, but the external threaded surface peening.The API thread compound is evenly smeared at two ends during last button, the clamping box cupling, 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.
The checking of the utility model technique effect: finite element analysis and actual loading test checking are adopted in the utility model design, show under last button, interior pressure and tensile load effect, and this helicitic texture form has excellent sealing performance and reduces the effect of shoulder stress.Sleeve pipe to specification 139.7 * 9.17mm N80 carries out mechanical analysis, and The results is seen Fig. 3 to shown in Figure 5, and the make-and-break test result is through going up button, 3 shackles 3 times and crossing torsional moment test for 1 time and all do not have thread gluing and take place, and the torque wrench moment regulation sees Table 1.Leak in the following nothing of VME=85% combined load envelope and thermal cycle conditions and to take place, the stretching failure load such as reaches at the body requirement.
Table 1 torque wrench moment (N/m)
| Specification (mm) | Grade of steel | Maximum | Best | Minimum |
| 139.7×9.17 | N80 | 6500 | 6000 | 5500 |
Claims (6)
1. gas well sleeve pipe air-tight seal screw joint, comprise nipple, be arranged on torque shoulder (1) and primary seal between nipple, it is characterized in that: described primary seal comprises near first sealing (2) of torque shoulder (1) and second sealing (3) of close nipple; Described first is sealed into the conical surface/conical surface seal structure, and described second is sealed into the conical surface/ball face sealing structure; Described torque shoulder is-4.5 °～-5.5 ° torque shoulder.
2. gas well sleeve pipe air-tight seal screw joint according to claim 1, it is characterized in that: described torque shoulder is-5 ° of torque shoulder.
3. gas well sleeve pipe air-tight seal screw joint according to claim 1 and 2 is characterized in that: the tapering of the conical surface of described first sealing is 1: 6～1: 12, and the tapering of the conical surface of described second sealing equates with the conical surface of first sealing; The circular arc R radius of the sphere of described second sealing is 60～90mm.
4. gas well sleeve pipe air-tight seal screw joint according to claim 3 is characterized in that: described primary seal length H is 3～6mm; Described torque shoulder width L is 4～6mm.
5. gas well sleeve pipe air-tight seal screw joint according to claim 3 is characterized in that: described joint screw thread is the API buttress thread.
6. gas well sleeve pipe air-tight seal screw joint according to claim 5 is characterized in that: the screw thread spigot surface angle [alpha] of described API buttress thread
1It is 10 °～45 °; Screw thread bearing surface angle [alpha]
2It is 3 °～-30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200379274U CN201982024U (en) | 2010-12-08 | 2011-02-15 | Casing gas seal screwed nipples for gas well |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020647956.8 | 2010-12-08 | ||
| CN201020647956 | 2010-12-08 | ||
| CN2011200379274U CN201982024U (en) | 2010-12-08 | 2011-02-15 | Casing gas seal screwed nipples for gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201982024U true CN201982024U (en) | 2011-09-21 |
Family
ID=44609487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200379274U Expired - Fee Related CN201982024U (en) | 2010-12-08 | 2011-02-15 | Casing gas seal screwed nipples for gas well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201982024U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704864A (en) * | 2012-06-25 | 2012-10-03 | 西安三环科技开发总公司 | Threaded nipple for development of shale gases |
| 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 |
| CN106639909A (en) * | 2016-11-29 | 2017-05-10 | 无锡金顶石油管材配件制造有限公司 | Anti-thread-gluing sealing connecting pipe joint |
| CN111963076A (en) * | 2020-08-05 | 2020-11-20 | 中国石油天然气集团有限公司 | Air-tight screw-connected pipe joint |
| CN114352211A (en) * | 2021-12-23 | 2022-04-15 | 西安德信成科技有限责任公司 | Sealing threaded connection assembly method for oil pipe and casing pipe combination |
-
2011
- 2011-02-15 CN CN2011200379274U patent/CN201982024U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704864A (en) * | 2012-06-25 | 2012-10-03 | 西安三环科技开发总公司 | Threaded nipple for development of shale gases |
| CN102704864B (en) * | 2012-06-25 | 2015-10-28 | 西安三环科技开发总公司 | Shale gas exploitation nipple |
| 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 |
| CN106639909A (en) * | 2016-11-29 | 2017-05-10 | 无锡金顶石油管材配件制造有限公司 | Anti-thread-gluing sealing connecting pipe joint |
| CN111963076A (en) * | 2020-08-05 | 2020-11-20 | 中国石油天然气集团有限公司 | Air-tight screw-connected pipe joint |
| CN114352211A (en) * | 2021-12-23 | 2022-04-15 | 西安德信成科技有限责任公司 | Sealing threaded connection assembly method for oil pipe and casing pipe combination |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20140215 |