CN1065018C - Screw joint for oil pipe and casing pipe - Google Patents
Screw joint for oil pipe and casing pipe Download PDFInfo
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- CN1065018C CN1065018C CN971152888A CN97115288A CN1065018C CN 1065018 C CN1065018 C CN 1065018C CN 971152888 A CN971152888 A CN 971152888A CN 97115288 A CN97115288 A CN 97115288A CN 1065018 C CN1065018 C CN 1065018C
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Abstract
The present invention relates to a screwed nipple for oil pipes and sleeve pipes of oil field drilling wells. The present invention is composed of pipe bodies 1, 3 and a pipe joint hoop 2 which are combined through screw threads engaged with the pipe bodies 1, 3 and the pipe joint hoop 2, wherein the conicity of the screw thread in the diameter direction is 1/M; the conicity of the starting end of the screw thread of the pipe bodies and/or the pipe joint hoop in a certain length L, W' is 1/(M-q), and q is between 0.1 and 4.5; the conicity of the tail end of the screw threads of the pipe bodies and/or the pipe joint hoop in a certain length W, L' is 1/(m+q); the effective diameter value of the screw threads in intersections with different conicities is the same. The present invention divides the screw threads of the pipe bodies and the pipe joint hoop into 2 or 3 segments through segment change of the engineering conicity of the pipe bodies and the pipe joint hoop, so the contact stress on each tooth surface of the screw threads is homogenized, and the thread gluing of the tooth surface of the screw threads is slowed down or avoided.
Description
The present invention relates to the helicitic texture of a kind of oil field drill tubing, sleeve pipe.
In oil field recover petroleum, natural gas process, oil pipe is the oil tool of requirement Reusability, according to API (American Petroleum Institute (API)) standard code, its performance should satisfy: oil pipe tightly thread gluing do not occur with unloading (prescribed torque value) 4 times at machine, and sleeve pipe does not allow to occur thread gluing yet. Along with the development of petroleum industry, the oil field generally requires oil pipe repeatedly to use in order to reduce cost, wishes that machine is tight and unload number of times above 4 times. Mainly be the thread gluing at screw thread place the destruction of oil pipe generally speaking. For example, round thread oil, the sleeve pipe of pressing tapering production in 1: 16 that use in the oil field at present, every index all meets the API standard, twists the best value that the relay square also meets recommendation, still is easy to occur thread gluing. Cause the position of thread gluing mainly to locate at the 1st, 2 buttons (little end) of pipe body screw thread and last two buttons (large end) of pipe body threaded connection place. If at Guan Tixiao end 1,2 buttons with detain greatly last two screw threads of deducting existing thread gluing and continue to use, will destroy the screw thread tooth surface shape, make thread gluing development and make the sealing property of screw thread and be connected the performance reduction in the middle of the section of being threaded, make it to scrap.
The objective of the invention is by improving the structure of oil, sleeve pipe the screw thread sticky thread resistance obviously to be improved, machine is tight, dismounting and the number of times of not thread gluing can increase substantially, and improves the service life of product.
For achieving the above object, the technical solution of the present invention's proposition is:
A kind of oil, casing thread connection, by pipe body 1,3 and pipe connect hoop 2 and form by the screw thread that is engaged with, pipe body 1,3 screw thread length are L4, to connect hoop 2 screw thread length be L to pipe7The tapering of screw thread on the diameter direction is 1: M, M generally gets 16, wherein: the certain length L in top and/or the interior tapering of W ＇=[(2/18)～(7/18)] times screw thread length that pipe body and/or pipe connect the screw thread of hoop are 1: (M-q), q gets 0.1～4.5, and is identical in the screw thread central diameter value of the handing-over point of different taperings.
The interior tapering of terminal certain length L ＇, the W of screw thread that pipe body and/or pipe connect hoop is 1: (M+q), and the screw thread length L of its middle tube body top part=[(2/18)～(5/18)] L4, the screw thread length W=[(2/18 of the terminal part of pipe body)～(5/18)] L4, the length that pipe meets the screw thread top part W ＇ of hoop is=[(2/18)～(4/18)] L7, the length of terminal part is L ＇=[(2/18)～(7/18)] L7。
The below engages accompanying drawing the present invention is further described.
Accompanying drawing is oil of the present invention, casing thread connection structure schematic diagram.
Owing to the reason that causes the screw thread thread gluing is a lot, through a large amount of practices and theoretical the analysis as can be known, the excessive plastic deformation of the local contact point of the screw thread flank of tooth, making and producing adhesion between flank of tooth metal is the main cause that causes thread gluing. For existing oil pipe screw thread, when all kinds of how much parameters are normal (meeting the API standard), through finite element analysis, Maximum Contact stress skewness between each flank of tooth, it is 2.5～3 times of the average Maximum Contact stress of each flank of tooth of centre that Guan Tixiao holds the 1st, 2 tooth Maximum Contact stress and the Guan Tida end last two tooth point face Maximum Contact stress that are threaded, and under the condition of the stubborn relay square that API stipulates, generally all surpass material contact stress allowable, cause the at first thread gluing of connecting thread two ends. The present invention twists the regularity of distribution that connects rear Contact Stress of Gear according to taper thread, and segmented conversion pipe body and the engineering tapering that connects hoop will be managed the body screw thread and be divided into 2 or 3 sections, and corresponding pipe connects the hoop screw thread and also is divided into 2 or 3 sections, and the pitch of each section screw thread is still identical. The mode of this kind taper mutation can make screw thread Contact Stress of Gear homogenising, its mechanism is following 2 points: section be out of shape difficulty in the middle of improving Guan Tida end and connect hoop from structure because wall thickness is thicker, makes two ends after the flank engagement be reserved with the gap of the unnecessary deflection of release; Bind round on the poisson effect of twisting after connecing with connecing from the pipe body, when being subjected to ring, the pipe body is subjected to ring behind tensile force to compressing, connect hoop, connect hoop and axially will shorten, manage axon to extending, this kind variation can cause the two ends Contact Stress of Gear greater than the centre, behind the taper mutation, also reserved the space of a small amount of axial deformation, become like this contact stress that makes two ends and reduce, realize the contact stress homogenising, can slow down or prevent the flank of tooth thread gluing of screw thread.
Referring to accompanying drawing, 1,3 are the pipe body, and 2 for connecing hoop, and for oil, the sleeve pipe of API standard code in the prior art, managing on the body has external screw thread, i.e. ABCD section, and screw thread length is L4 Connecing has two sections internal threads on the hoop, i.e. the symmetric part of A ＇ B ＇ C ＇ D ＇ and it, and screw thread length is L7 The buckle-shaped of screw thread can be API standard round screw thread, also can be buttress thread. The present invention improves on the basis of this technology, be whole screw thread Duan Shangwei fixed value with thread taper, be improved to the screw thread of 2,3 sections taper mutations, connect the different assembly of hoop through above-mentioned taper mutation pipe body, pipe, can obtain several oil, casing thread connection product, the below introduces respectively following 4 classes easy, easy to process of implementing:
1. pipe body and the pipe screw thread that connects hoop all is divided into two sections, and the pitch of screw thread is identical, that is:
Body portion: be divided into two sections of AB and BCD, the length L of screw thread top (little end) AB section=[(2/18)～(7/18)] L4, the tapering on the diameter direction gets 1: (M-q), the turning point of AB section and BCD section is the B point, the central diameter value of two sections screw threads of this point is identical, wherein L4Be the screw thread end point length of API standard code, M is the tapering of API regulation, generally gets 16, q and gets 0.1～4.5 (as follows); Do not have effect less than 0.1, greater than 4.5 normal engagements that can affect screw thread.
The pipe collar segments: be divided into A ＇ B ＇ C ＇ section and C ＇ D ＇ section, the length of screw thread top (little end) C ＇ D ＇ section is W ＇=[(2/18)～(7/18)] L7, the tapering of C ＇ D ＇ section on the diameter direction gets 1: (M-q), the tapering of A ＇ B ＇ C ＇ section is 1: M, and the turning point of A ＇ B ＇ C ＇ section and C ＇ D ＇ section is C ＇ point, the central diameter value of two sections screw threads of this point is identical.
2. the screw thread of pipe body is divided into three sections, and the screw thread that pipe connects hoop is an equal tapering, that is:
Pipe body screw thread is divided into AB, BC, CD section, screw thread top (little end) AB section screw thread: L=[(2/18)～(7/18)] L4, the tapering on the diameter direction gets 1: (M-q); BC section screw thread: Y=[(4/18)～(14/18)] L4, the tapering on the diameter direction gets 1: M; Screw thread terminal (large end) CD section screw thread length is W=[(2/18)～(7/18)] L4, the tapering on the diameter direction gets 1: (M+q), 2 each central diameters at two sections screw threads of tapering turning point B, C are worth identical.
The screw thread that pipe connects hoop is 1 of same tapering: M.
3. the screw thread of pipe body is an equal tapering, and the screw thread that pipe connects hoop is divided into three sections, and its pitch is identical, that is:
The screw thread that pipe connects hoop is divided into A ＇ B ＇, B ＇ C ＇, C ＇ D ＇ section, wherein screw thread terminal (large end) A ＇ B ＇ section screw thread L ＇=[(2/18)～(7/18)] L7, the tapering 1 on the diameter direction: (M+q), B ＇ C ＇ segment length Y ＇=[(4/18)～(14/18)] L7, the tapering on the diameter direction gets 1: M, the length W ＇ of screw thread top (little end) C ＇ D ＇ section=[(2/18)～(7/18)] L7, the tapering on the diameter direction gets 1: (M-q).
The screw thread of pipe body is equal tapering 1 a: M.
4. pipe body and the pipe screw thread that connects hoop all is divided into three sections, and the pitch of each section is identical, that is:
Pipe body screw thread is divided into AB, BC, CD section, screw thread top (little end) AB section screw thread: L=[(2/18)～(5/18)] L4, the tapering on the diameter direction gets 1: (M-q); BC section screw thread: Y=[(8/18)～(14/18)] L4, the tapering on the diameter direction gets 1: M; Screw thread terminal (large end) CD section screw thread length is W=[(2/18)～(5/18)] L4, the tapering on the diameter direction gets 1: (M+q), tapering turning point B, each central diameter in two sections screw threads of C point are worth identical.
The screw thread that pipe connects hoop is divided into A ＇ B ＇, B ＇ C ＇, C ＇ D ＇ section, wherein the terminal A ＇ of screw thread B ＇ section screw thread L ＇=[(2/18)～(7/18)] L7, the tapering 1 on the diameter direction: (M+q), B ＇ C ＇ segment length Y ＇=[(4/18)～(14/18)] L7, the tapering on the diameter direction gets 1: M, the length W ＇ of screw thread top C ＇ D ＇ section=[(2/18)～(7/18)] L7, the tapering on the diameter direction gets 1: (M-q).
The below introduces one embodiment of the present of invention.
The product of present embodiment is Inch (φ 88.9mm external diameter) oil pipe, steel level N-80, material characteristic: surrender intensity σs=552～758MPa, minimum tensile strength sigmab=689MPa, surface contact stress (hertz stress): [σ] HO=680MPa.
Relevant size except screw thread satisfies the dimensional requirement of API non-upset tubing.
Being shaped as of screw thread part: the tapering of pipe body screw thread is divided into two sections of AB, BCD, and the tapering that pipe connects hoop is divided into two sections of A ＇ B ＇ C ＇, C ＇ D ＇, specifically is of a size of:
The pipe body:
AB section: L=(4/18) L4=(4/18) * (18 * 3.175)=10.16mm, the processing tapering: 1: (M-q), M gets 16, q and gets 0.5, and namely tapering is 1: 15.5,
Pipe body BCD section, length Y+W=L4-L=18 * 2.54-10.16=35.64mm, this section tapering are 1: 16,
Pipe connects hoop:
Connect hoop A ＇ B ＇ C ＇ section:
Length L ＇+Y ＇=L7-W ＇=20 * 2.54-10.16=40.64mm, this section tapering are 1: 16,
Connect hoop C ＇ D ＇ section:
Length W ＇=(4/18) L7=(4/18) * 20 * 2.54=11.29mm, this section tapering are 1: 15.5.
With the whelk line structure that the present invention obtains, process at Digit Control Machine Tool, adopt machining blanks, cutter, the man-hour identical with the standard oil pipe of processing prior art, under the tight moment state of regulation machine, the performance contrast that obtains product is as shown in table 1. As known from Table 1, in raw material, equipment, man-hour all in the indeclinable situation, the contact performance of the oil that the present invention obtains, cover gas thread, namely the ability of anti-thread gluing is obviously improved, meet in other performance in the situation of API standard, the Contact Stress of Gear distribution situation homogenising that become, and do not affect the connection performance, tight and the dismounting of machine and the number of times of not thread gluing can increase substantially has improved the service life of product.
Table 1 N-80 steel level Inch oil pipe Contact Stress of Gear contrast table
| The API standard pipe | Oil pipe of the present invention | |
| Guan Tixiao holds Maximum Contact stress (MPa) | 1064 | 503 |
| Guan Tida holds Maximum Contact stress (MPa) | 911 | 632 |
| Slippage strength (T) during tight 2 button of machine | 96．0500 | 96．0005 |
| Flank of tooth contact stress allowable (MPa) | 680 | 680 |
Claims (3)
1. an oil, casing thread connection connect hoop [2] by pipe body [1,3] and pipe and form by the screw thread that is engaged with, and the screw thread length of managing body [1,3] is L4, the pipe screw thread length that connects hoop [2] is L7, the tapering of screw thread on the diameter direction is 1: M, M gets 16, it is characterized in that: the certain length L in screw thread top of pipe body=[(2/18)～(7/18)] L4Tapering be 1: (M-q), q gets 0.1～4.5, and/or pipe meets the screw thread top one measured length W ＇ of hoop=[(2/18)～(7/18)] L7Tapering be 1: (M-q), identical in the screw thread central diameter value of the handing-over point of different taperings.
2. an oil, casing thread connection connect hoop 2 by pipe body [1,3] and pipe and form by the screw thread that is engaged with, and the screw thread length of managing body [1,3] is L4, to connect hoop 2 screw thread length be L to pipe7, the tapering of screw thread on the diameter direction is 1: M, and M gets 16, it is characterized in that:
The certain length L in screw thread top of pipe body=[(2/18)～(7/18)] L4Tapering be 1: (M-q), q gets 0.1～4.5, and/or pipe meets the screw thread top one measured length W ＇ of hoop=[(2/18)～(7/18)] L7Tapering be 1: (M-q);
The terminal measured length W=[(2/18 of the screw thread of pipe body)～(5/18)] L4Tapering be 1: (M+q), and/or pipe meets the terminal L ＇ of hoop screw thread=[(2/18)～(7/18)] L7Tapering be 1: (M+q), identical in the screw thread central diameter value of the handing-over point of above-mentioned different taperings.
3. oil according to claim 2, casing thread connection, it is characterized in that: screw thread length and tapering that described pipe body [1,3], pipe connect hoop [2] are: the certain length L in screw thread top of pipe body=[(2/18)～(5/18)] L4Tapering be 1: (M-q), q gets 0.1～4.5, and pipe meets the screw thread top one measured length W ＇ of hoop=[(2/18)～(4/18)] L7Tapering be 1: (M-q).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN971152888A CN1065018C (en) | 1997-09-02 | 1997-09-02 | Screw joint for oil pipe and casing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN971152888A CN1065018C (en) | 1997-09-02 | 1997-09-02 | Screw joint for oil pipe and casing pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1177698A CN1177698A (en) | 1998-04-01 |
| CN1065018C true CN1065018C (en) | 2001-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN971152888A Expired - Fee Related CN1065018C (en) | 1997-09-02 | 1997-09-02 | Screw joint for oil pipe and casing pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1065018C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021965A (en) * | 2019-12-30 | 2020-04-17 | 重庆大学 | Double-taper external threaded rod, double-taper internal threaded seat and double-taper combined joint |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871327A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Variable conicity API (American Petroleum Institute) thread oil sleeve joint |
| CN113107384B (en) * | 2021-04-20 | 2021-09-24 | 大庆市华禹石油机械制造有限公司 | Oil pipe non-thread gluing connecting structure and process |
| CN114961590B (en) * | 2021-12-08 | 2025-04-11 | 中国石油天然气集团有限公司 | A special threaded joint for casing used in multi-stage fracturing of unconventional oil and gas horizontal wells |
| CN119531744A (en) * | 2023-08-28 | 2025-02-28 | 中国石油天然气股份有限公司 | Internal thread structure of oil pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2744163A1 (en) * | 1976-09-30 | 1978-04-06 | Hauk Ernest D | METHOD AND DEVICE FOR MEASURING AND SCREWING PIPES |
| CN1103148A (en) * | 1993-06-30 | 1995-05-31 | 阿吉普公司 | Improved anti-seizure protection for joints, particularly suitable for the petroleum sector |
| EP0713952A1 (en) * | 1994-11-22 | 1996-05-29 | Sumitomo Chemical Company, Limited | Threaded joint for oil well pipes |
| DE4446806C1 (en) * | 1994-12-09 | 1996-05-30 | Mannesmann Ag | Gas-tight pipe connection |
| CN1142582A (en) * | 1995-04-28 | 1997-02-12 | 瓦卢莱克石油气体公司 | Pipe threaded joints |
| CN2248815Y (en) * | 1996-04-12 | 1997-03-05 | 成都无缝钢管厂 | Sealing screw-threaded joint for petroleum collar |
-
1997
- 1997-09-02 CN CN971152888A patent/CN1065018C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2744163A1 (en) * | 1976-09-30 | 1978-04-06 | Hauk Ernest D | METHOD AND DEVICE FOR MEASURING AND SCREWING PIPES |
| CN1103148A (en) * | 1993-06-30 | 1995-05-31 | 阿吉普公司 | Improved anti-seizure protection for joints, particularly suitable for the petroleum sector |
| EP0713952A1 (en) * | 1994-11-22 | 1996-05-29 | Sumitomo Chemical Company, Limited | Threaded joint for oil well pipes |
| DE4446806C1 (en) * | 1994-12-09 | 1996-05-30 | Mannesmann Ag | Gas-tight pipe connection |
| CN1142582A (en) * | 1995-04-28 | 1997-02-12 | 瓦卢莱克石油气体公司 | Pipe threaded joints |
| CN2248815Y (en) * | 1996-04-12 | 1997-03-05 | 成都无缝钢管厂 | Sealing screw-threaded joint for petroleum collar |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021965A (en) * | 2019-12-30 | 2020-04-17 | 重庆大学 | Double-taper external threaded rod, double-taper internal threaded seat and double-taper combined joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1177698A (en) | 1998-04-01 |
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Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD |
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Address after: Orchard, Fujin Road, Baoshan District, Shanghai Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. |
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