CN201013257Y - Oil pipe coupling - Google Patents
Oil pipe coupling Download PDFInfo
- Publication number
- CN201013257Y CN201013257Y CNU2007200347629U CN200720034762U CN201013257Y CN 201013257 Y CN201013257 Y CN 201013257Y CN U2007200347629 U CNU2007200347629 U CN U2007200347629U CN 200720034762 U CN200720034762 U CN 200720034762U CN 201013257 Y CN201013257 Y CN 201013257Y
- Authority
- CN
- China
- Prior art keywords
- thread piece
- shoulder
- oil pipe
- external
- external thread
- Prior art date
- 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
Links
- 230000008878 coupling Effects 0.000 title description 2
- 238000010168 coupling process Methods 0.000 title description 2
- 238000005859 coupling reaction Methods 0.000 title description 2
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 239000003129 oil well Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model provides a double-shoulder torsion resistant joint, and belongs to the technical field of oil well pipe threaded joints. The joint consists of an internal thread part and an external thread part. The internal thread part comprises internal thread, a middle internal torque shoulder, a sealing structure of an inner cone-shaped face and an internal torque shoulder on end and so on. The external thread part comprises external thread, a middle external torque shoulder, a sealing structure of an outer cone-shaped face, an external torque shoulder on end and so on. When the joint is used, the internal thread is tightly fit with the external thread; the sealing structure of the inner cone-shaped face is tightly fit with the sealing structure of the outer cone-shaped face; the middle internal torque shoulder is tightly fit with the middle external torque shoulder; the internal torque shoulder on end is tightly fit with the external torque shoulder one end. After the joint is screwed down, the inner cone-shaped face is tightly fit with the outer cone-shaped face, and the joint is highly airproof. The two torque shoulders and the thread jointly bear the torque; and the resistance to torsion of the joint is significantly improved.
Description
Technical field
The utility model relates to a kind of nipple, particularly a kind of oil, casing thread connection belong to oil well pipe thread link technique field.
Background technology
In the ocean when recover petroleum or natural gas, it is very expensive to build offshore boring island, therefore need on an offshore boring island, drill oil gas well as much as possible, at this moment well not only will be crept into downwards, produce vertical displacement, also will produce horizontal movement to extending away from the platform place simultaneously, horizontal movement often reaches more than several kms.Drilling this so-called extended reach well or horizontal well has higher requirement to tubing and casing, usually be hampered when tubing and casing is lowered under this hole condition, need just can be lowered to while rotating, exerting pressure, therefore need joint to have higher torsional strength and anti-compression properties, ordinary couplings is difficult to meet the demands.
Find that by prior art documents the Chinese patent publication number is CN 2575286Y, open day is on September 24th, 2003, and the utility model patent name is called " oil, casing thread connection ", and this patent is improved above-mentioned API screw thread.This utility model is a kind of tapered thread joint, formed by being threaded by external thread piece and inner thread piece: its screw thread is improved buttress thread, the external thread piece front end has one column sealed, a protruding ball face sealing face is arranged beyond the screw thread of inner thread piece, and cylinder and sphere interference fit constitute the primary seal part.The external thread piece front end falls-9 ° or-15 ° of angles, constitutes secondary hermetic unit with-9 ° of inner thread piece or-15 ° of shoulder interference fit.Compare with the API joint, this patent is owing to designed the shape metallic leak-proof structure of cylinder/sphere form, and sealing performance improves, owing to increased torque shoulder, torsional property also increases simultaneously.
Its weak point is to have only a torque shoulder, and the torsional property increase rate is big inadequately.Certainly, the thickness that increases torque shoulder also can improve its torsional property.But the sealing of joint is that elasticity interference fit inner, the external seal face realizes that the metallic seal contact area of cylinder/sphere form is less, and the resistance of deformation of generation is also less.Will inevitably cause sealing contact position tube wall too thick if increase shoulder thickness, be difficult to take place elastic deformation, and then damage sealing surface, so this method be infeasible.
Summary of the invention
The utility model provides a kind of oil, casing joint with higher torsional property at the deficiencies in the prior art.The way of this joint by a shoulder is divided into two, solve the difficult problem that a shoulder is difficult to increase thickness, simultaneously, cylinder/ball face sealing has been changed to the conical surface/conical surface seal structure, increased the contact area at sealing surface place, made sealing surface can bear bigger resistance of deformation.
The technical scheme that provides according to the utility model, the connection of described oil pipe comprises inner thread piece that is positioned at oil pipe one end and the external thread piece that is positioned at the oil pipe other end, and inner thread piece on oil pipe and the external thread piece on another root oil pipe are realized interference fit by buttress thread provided thereon, it is characterized in that: in the outer end of external thread piece torque shoulder outside the end is set, the end face of inner thread piece end contacts with outer moment of torsion half the circumference of the sleeve where it joins the shoulder; End internal torque shoulder is set in the inner of inner thread piece, and the end face of external thread piece end contacts with the internal torque half the circumference of the sleeve where it joins the shoulder.
Between external thread piece and inner thread piece, near outside the position of moment of torsion half the circumference of the sleeve where it joins the shoulder the outer radial sealing surface is set.Sealing surface radially between external thread piece and inner thread piece, near the position of internal torque half the circumference of the sleeve where it joins the shoulder, being provided with.Oil pipe end is provided with the wall thickness at position of external thread piece and inner thread piece greater than the wall thickness at other position of oil pipe.
Compared with prior art, the utlity model has marked improvement, be in particular in: 1, a torque shoulder is divided into two, solved the difficult problem that shoulder is difficult to thicken, moment of torsion is shared by two shoulders, has reduced stress and has concentrated, and has significantly improved the anti-twisting property of oil pipe link.2, the length of sealing surface is longer, makes the elastic deformability of conical surface seal structure better, and simultaneously, its tapering is set to different numerical value, guaranteed that farthest the two cooperates after, contact pressure evenly distributes, and has improved the hermetic seal effect of joint.
Adopt above-mentioned this structure because oil pipe of the present utility model connects, make it not only have good gas sealing ability, also had good torsional property, anti-twisting property reaches more than 3 times of common API joint, reaches more than 1.5 times of separate unit shoulder grafting head.Especially special joint need not be set in addition again, directly screw thread and the moment of torsion half the circumference of the sleeve where it joins the shoulder that utilizes end itself to have in two oil pipes connects, and be both convenient, reliable again.
Description of drawings
Fig. 1 is a structure chart of the present utility model.
The specific embodiment
The utility model is as general as taper pipe thread and connects, and it is made up of inner thread piece 1 and external thread piece 2 two parts.Wherein, be processed with inclined to one side trapezoidal internal thread, end internal torque shoulder 4 is set in the inner of inner thread piece 1 at the inwall of inner thread piece 1; Inwall at external thread piece 2 is processed with trapezoidal partially external screw thread, and torque shoulder 5 outside the end is set in the outer end of external thread piece 6; When connecting two oil pipes, internal thread and external screw thread engagement, the end face of inner thread piece 1 end contacts with outer moment of torsion half the circumference of the sleeve where it joins the shoulder 5; The end face of external thread piece 2 ends contacts with internal torque half the circumference of the sleeve where it joins the shoulder 4, and torque shoulder 5 forms interference fit respectively outside end internal torque shoulder 4 and the end, so that improve its sealing performance and bonding strength.
Between external thread piece 2 and inner thread piece 1, near outside the position of moment of torsion half the circumference of the sleeve where it joins the shoulder 5 outer radial sealing surface 6 is set.Sealing surface 3 radially between external thread piece 2 and inner thread piece 1, near the position of internal torque half the circumference of the sleeve where it joins the shoulder 4, being provided with.Oil pipe end is provided with the wall thickness at position of external thread piece 2 and inner thread piece 1 greater than the wall thickness at other position of oil pipe, to improve the intensity of end.
Claims (4)
1. the connection of an oil pipe, comprise inner thread piece (1) that is positioned at oil pipe one end and the external thread piece (2) that is positioned at the oil pipe other end, and the external thread piece (2) on the inner thread piece (1) on oil pipe and another root oil pipe is by buttress thread provided thereon (7) realization interference fit, it is characterized in that: in the outer end of external thread piece (2) torque shoulder outside the end (5) is set, the end face of inner thread piece (1) end contacts with outer moment of torsion half the circumference of the sleeve where it joins the shoulder (5); In the inner of inner thread piece (1) end internal torque shoulder (4) is set, the end face of external thread piece (2) end contacts with internal torque half the circumference of the sleeve where it joins the shoulder (4).
2. the connection of oil pipe according to claim 1 is characterized in that: between external thread piece (2) and inner thread piece (1), near outside the position of moment of torsion half the circumference of the sleeve where it joins the shoulder (5) outer radial sealing surface (6) is set.
3. the connection of oil pipe according to claim 1 is characterized in that: sealing surface (3) radially in being provided with between external thread piece (2) and inner thread piece (1), near the position of internal torque half the circumference of the sleeve where it joins the shoulder (4).
4. the connection of oil pipe according to claim 1 is characterized in that: oil pipe end is provided with the wall thickness at position of external thread piece (2) and inner thread piece (1) greater than the wall thickness at other position of oil pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200347629U CN201013257Y (en) | 2007-02-16 | 2007-02-16 | Oil pipe coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200347629U CN201013257Y (en) | 2007-02-16 | 2007-02-16 | Oil pipe coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201013257Y true CN201013257Y (en) | 2008-01-30 |
Family
ID=39025043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200347629U Expired - Fee Related CN201013257Y (en) | 2007-02-16 | 2007-02-16 | Oil pipe coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201013257Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824969A (en) * | 2010-04-09 | 2010-09-08 | 衡阳华菱连轧管有限公司 | Double-shoulder double-sealing face screwed nipple and collar-free oil well pipe using same |
| CN104499981A (en) * | 2014-11-26 | 2015-04-08 | 无锡世联丰禾石化装备科技有限公司 | Heavy oil thermal recovery wellhead gas injection blowout preventer |
| CN105008785A (en) * | 2013-03-05 | 2015-10-28 | Nkk钢管株式会社 | Double shoulder tool joint |
| CN106437552A (en) * | 2016-11-15 | 2017-02-22 | 东营威玛石油钻具有限公司 | High-sealing drill pipe joint |
| CN106437551A (en) * | 2016-11-15 | 2017-02-22 | 东营威玛石油钻具有限公司 | High-torsion-resistance drill pipe connector with good sealing |
| CN107795286A (en) * | 2017-11-21 | 2018-03-13 | 西南石油大学 | A kind of direct linkage type tubing and casing multistage air-tight structure |
-
2007
- 2007-02-16 CN CNU2007200347629U patent/CN201013257Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824969A (en) * | 2010-04-09 | 2010-09-08 | 衡阳华菱连轧管有限公司 | Double-shoulder double-sealing face screwed nipple and collar-free oil well pipe using same |
| CN105008785A (en) * | 2013-03-05 | 2015-10-28 | Nkk钢管株式会社 | Double shoulder tool joint |
| CN104499981A (en) * | 2014-11-26 | 2015-04-08 | 无锡世联丰禾石化装备科技有限公司 | Heavy oil thermal recovery wellhead gas injection blowout preventer |
| CN106437552A (en) * | 2016-11-15 | 2017-02-22 | 东营威玛石油钻具有限公司 | High-sealing drill pipe joint |
| CN106437551A (en) * | 2016-11-15 | 2017-02-22 | 东营威玛石油钻具有限公司 | High-torsion-resistance drill pipe connector with good sealing |
| CN107795286A (en) * | 2017-11-21 | 2018-03-13 | 西南石油大学 | A kind of direct linkage type tubing and casing multistage air-tight structure |
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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: 20080130 Termination date: 20110216 |