CN101864908A - Threaded connector for pipes - Google Patents
Threaded connector for pipes Download PDFInfo
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- CN101864908A CN101864908A CN201010200313A CN201010200313A CN101864908A CN 101864908 A CN101864908 A CN 101864908A CN 201010200313 A CN201010200313 A CN 201010200313A CN 201010200313 A CN201010200313 A CN 201010200313A CN 101864908 A CN101864908 A CN 101864908A
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Abstract
The invention discloses a threaded connector for pipes, which comprises an inner threaded part (1) and an outer threaded part (2), wherein the inner wall of the internal threaded part (1) is provided with an inner cylindrical sealing surface (121), an inner conical sealing surface (122) and a flashback inner conical sealing surface (123) of 25 degrees; the periphery of the outer threaded part (2) is provided with an outer convex circular arc sealing surface (221), an outer conical sealing surface (222) and a chamfered shoulder outer conical surface (223) of 25 degrees; the outer convex circular arc sealing surface (221) forms an interference fit with the inner cylindrical sealing surface (121); the chamfered shoulder outer conical surface (223) of 25 degrees forms a seal fit with the flashback inner conical sealing surface (123) of 25 degrees; and the outer conical sealing surface (222) forms a seal fit with the inner conical sealing surface (122). The threaded connector still has a favorable sealing effect under the condition of greater stretch, extrusion and torques, can not generate the thread gluing phenomenon, and is especially used as a threaded connector for oil sleeve pipes.
Description
Technical field
The present invention relates to a kind of nipple, particularly a kind of pipe screw joint, it mainly is to be used for oil casing threaded joint.
Background technology
China's oil, the most frequently used oil casing threaded joint in gas field are pressed the oil casing threaded joint of API (American Petroleum Institute (API)) standard production at present, its advantage is technology maturation, be easy to processing, interchangeability by force, is not subjected to any patent limitation, but because there are some inevitable shortcomings in the structural reason of API nipple own.For example: bonding strength is low, sealing performance is unreliable, easily leak, go up button is difficult to control, easily thread gluing etc. takes place.To this, each tubing and casing processing factory active research performance special thread joints more better all both at home and abroad than API nipple.For example BP GB2160609 discloses a kind of pipe screw joint, this kind joint is made up of external thread piece and inner thread piece two parts, external thread piece has increased radially dome arc part at front end except that screw thread, inner thread piece has increased the circular cone sealing surface outside screw thread, after internal and external threads cooperates, convex arc surface and circular cone sealing surface interference fit constitute the primary sealing area structure, the right angle shoulder interference fit of externally threaded right angle end face and internal thread constitutes secondary sealing area simultaneously, this joint has excellent sealing performance and bonding strength, but stretched, during bending load, the primary sealing area contact pressure descends, the secondary sealing area contact pressure descends faster, influences its sealing performance.
Domestic also have several disclosed pipe screw joint patents, it all is the improvement product of above-mentioned BP product basically, all form by internal and external threads spare, all be to change sphere and conical surface seal into ball sealing surface and column sealed sealing, under effects such as axial tension, bending load, still keep higher contact pressure after making column sealed to form interference fit, and contact manual pressure does not change, improved greatly this joint with external applied load sealing performance with the ball sealing surface.But still in some problems, such as: 1) primary sealing area of inner thread piece is the ball face, and difficulty of processing is big, during the sphere of machining screw because knife bar is longer, add the instability in man-hour at the execution linear interpolation, and ball makes product percent of pass not high than the iron filings scuffing that is easier to be extruded; 2) the secondary sealing area part conical surface later that fallen-9 ° or-15 ° by the external thread piece front end face and inner thread piece fall the shoulder interference fit of-9 ° or-15 ° to constitute.This structure has load such as good counter-bending, interior external pressure, but cooperate with cylindrical interference and form because primary sealing area is the ball face, though also increased the full magnitude of interference of primary sealing area during the secondary sealing area interference simultaneously, make main sealing surface stress too concentrated easily, last shackle occurs thread gluing easily, damages primary sealing area.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of pipe screw joint is provided, it still has good sealing effectiveness under bigger stretching, extruding, torsional interaction, leakage accident can not take place, and thread gluing can not take place and damage sealing surface.
Technical scheme of the present invention is: a kind of pipe screw joint, and it comprises inner thread piece and external thread piece; Inner thread piece comprises interior seal section, the inwall of interior seal section be provided with interior column sealed, interior bevel sealing surface and later in bevel sealing surface; External thread piece comprises the external seal section, and the periphery of external seal section is provided with evagination circular arc sealing surface, outer bevel sealing surface and chamfering shoulder male cone (strobilus masculinus); Interior column sealed of the evagination circular arc sealing surface of external thread piece and inner thread piece is interference fit, and its magnitude of interference is designated as δ D, forms the primary seal structure; The chamfering shoulder male cone (strobilus masculinus) of external thread piece is turned one's head interior bevel sealing surface for conical surface contact seal cooperates with inner thread piece, forms the secondary hermetically-sealed construction in first road; The outer bevel sealing surface of external thread piece and the interior bevel sealing surface of inner thread piece form the secondary hermetically-sealed construction in second road for conical surface contact seal cooperates.
The further technical scheme of the present invention is: inner thread piece also comprises internal thread segment, and the internal thread of internal thread segment is a tapered thread, and the tapering of conical internal thread is 1: 16, and the thread type of internal thread is a buttress thread; External thread piece also comprises external thread section, external thread section is provided with conical external screw thread, the tapering of the conical external screw thread of external thread section is 1: 16, the externally threaded thread type of conical external screw thread section is a buttress thread, the conical internal thread of the conical external screw thread of the external thread section of external thread piece and the internal thread segment of inner thread piece is the interference threaded engagement, and its magnitude of interference is designated as δ d.
The present invention further technical scheme is: the magnitude of interference δ D of interference fit is δ d greater than the magnitude of interference of interference fit between the conical internal thread of the internal thread segment of the conical external screw thread of the external thread section of external thread piece and inner thread piece between interior column sealed of the evagination circular arc sealing surface of external thread piece and inner thread piece; And the pressure that magnitude of interference δ D brings is less than the material yield intensity of pipe screw joint.
The further again technical scheme of the present invention is: the angle that the cone element of bevel sealing surface is become with axial line in described equals 30 degree, the angle that the cone element of bevel sealing surface is become with radial line later equals 25 degree, and interior bevel sealing surface is connected by arc surface with later interior bevel sealing surface; The angle that the cone element of outer bevel sealing surface is become with axial line equals 30 degree, the angle that the cone element of chamfering shoulder male cone (strobilus masculinus) is become with radial line equals 25 degree, evagination circular arc sealing surface is connected by arc surface with outer bevel sealing surface, and outer bevel sealing surface is connected by arc surface with chamfering shoulder male cone (strobilus masculinus).
The also further technical scheme of the present invention is: the radius of curvature of the arc surface of external thread piece is greater than the radius of curvature of the arc surface of inner thread piece.
The further technical scheme of the present invention is: the tolerance of the secondary hermetically-sealed construction of the secondary hermetically-sealed construction in first road and second road can satisfy following relation: inner thread piece and external thread piece tighten socket the time can make the secondary hermetically-sealed construction in first road reach contact seal earlier than the secondary hermetically-sealed construction in second road, promptly the interior bevel sealing surface of turning one's head of the chamfering shoulder male cone (strobilus masculinus) of external thread piece and inner thread piece reaches earlier with the interior bevel sealing surface of inner thread piece than the outer bevel sealing surface of external thread piece and contacts cooperation.
The present invention compared with prior art has following characteristics:
It still has good sealing effectiveness under bigger stretching, extruding, torsional interaction, leakage accident can not take place, and thread gluing can not take place and damage sealing surface.
Below in conjunction with the drawings and specific embodiments detailed structure of the present invention is further described.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that Fig. 1 is along the enlarged drawing in the A line scope;
Fig. 3 is the structural representation of inner thread piece of the present invention;
Fig. 4 is that Fig. 3 is along the enlarged drawing in the B line scope;
Fig. 5 is the structural representation of external thread piece of the present invention;
Fig. 6 is that Fig. 5 is along the enlarged drawing in the C line scope;
Fig. 7 represents the structural representation of mode for the another kind of the screw thread of external thread piece of the present invention;
Fig. 8 is that Fig. 7 is along the enlarged drawing in the D line scope.
The specific embodiment
Embodiment
Shown in Fig. 1-8: a kind of pipe screw joint, it comprises inner thread piece 1 and external thread piece 2; Inner thread piece 1 comprises internal thread segment 11 and the interior seal section 12 that is close to internal thread segment 11; The internal thread 112 of internal thread segment 11 is a tapered thread, the endoporus 111 that is internal thread segment 11 is taper, endoporus 111 walls are provided with internal thread 112, the tapering of conical internal thread 112 is the same with API standard thread joint to be 1: 16, the tapering that is endoporus 111 is 1:16, and the thread type of internal thread 112 is buttress thread (adapting with the external screw thread 211 of the conical external screw thread section 21 shown in Fig. 7-8); The inwall of interior seal section 12 be provided with interior column sealed 121, interior bevel sealing surface 122 and later in bevel sealing surface 123, the angle r1=30 degree that the cone element of interior bevel sealing surface 122 is become with axial line, the angle r2=25 degree that the cone element of bevel sealing surface 123 is become with radial line later, interior bevel sealing surface 122 is connected by arc surface 124 with later interior bevel sealing surface 123.Shown in Fig. 5-8: external thread piece 2 comprises external thread section 21 and the external seal section 22 that is close to external thread section 21, external thread section 21 is provided with conical external screw thread 211, the tapering of the conical external screw thread 211 of external thread section 21 is the same with API standard thread joint to be 1: 16, the thread type of the external screw thread 211 of conical external screw thread section 21 is buttress thread (shown in Fig. 7-8), the conical external screw thread 211 of the external thread section 21 of external thread piece 2 is the interference threaded engagement with the conical internal thread 112 of the internal thread segment 11 of inner thread piece 1, its magnitude of interference is δ d, the periphery of external seal section 22 is provided with evagination circular arc sealing surface 221, outer bevel sealing surface 222 and chamfering shoulder male cone (strobilus masculinus) 223, the angle r3=30 degree that the cone element of outer bevel sealing surface 222 is become with axial line, the angle r4=25 degree that the cone element of chamfering shoulder male cone (strobilus masculinus) 223 is become with radial line, evagination circular arc sealing surface 221 is connected by arc surface 224 with outer bevel sealing surface 222, outer bevel sealing surface 222 is connected by arc surface 225 with chamfering shoulder male cone (strobilus masculinus) 223, the evagination circular arc sealing surface 221 of external thread piece 2 and interior column sealed 121 of inner thread piece 1 are interference fit, form the primary seal structure, its magnitude of interference is δ D, when it is in running order, stretched, during extruding, it is constant to keep the face of two faces of primary seal structure to press, and is being stretched, still keep good sealing effectiveness during extruding; The chamfering shoulder male cone (strobilus masculinus) 223 of external thread piece 2 cooperates for conical surface contact seal with the later interior bevel sealing surface 123 of inner thread piece 1, form the secondary hermetically-sealed construction in first road, the outer bevel sealing surface 222 of external thread piece 2 cooperates for conical surface contact seal with the interior bevel sealing surface 122 of inner thread piece 1, form the secondary hermetically-sealed construction in second road, the radius of curvature of the arc surface 225 of external thread piece 2 is a bit larger tham the radius of curvature of the arc surface 124 of inner thread piece 1, make and form one section gap or contact pressure very little (as shown in Figure 2) seldom between arc surface 225 and the arc surface 124, press bigger with the face that guarantees secondary hermetically-sealed construction in first road and the secondary hermetically-sealed construction in second road, promptly can prevent to be withstood by arc surface 225 and make the secondary hermetically-sealed construction of twice can not finely obtain sealing, make sealing effectiveness better.When tightening, when being subjected to axial tension, can keep the sealing surface part face of secondary hermetically-sealed construction in first road and the secondary hermetically-sealed construction in second road to press constant, sealing surface is not easy damage, have excellent sealing ability, it also has antitorque effect, and promptly the secondary hermetically-sealed construction in the secondary hermetically-sealed construction in first road and second road has stretch-proof, anti-extrusion, antitorque effect, in conjunction with the primary seal structure, the present invention still has good sealing effectiveness under bigger stretching, extruding, torsional interaction, leakage accident can not take place.
Because the dome arc structure of the dome arc sealing surface 221 of main close structure does not cause the thread gluing phenomenon can take place; The secondary hermetically-sealed construction in the secondary hermetically-sealed construction in first road and second road has in fact constituted a wedge-type seal structure and has strengthened twisting resistance, does not cause with the dome arc structure phase structure of the dome arc sealing surface 221 of primary sealing area and can damage sealing surface.
Form the primary seal structure magnitude of interference δ D satisfy following relational expression: the material yield intensity of the contact pressure＜nipple of internal pressure＜primary sealing area that nipple bore.
The magnitude of interference between the conical internal thread 112 of the conical external screw thread 211 of the external thread section 21 of external thread piece 2 and the internal thread segment 11 of inner thread piece 1 is the magnitude of interference δ D of δ d＜primary seal structure.
The tolerance of the secondary hermetically-sealed construction of the secondary hermetically-sealed construction in first road and second road can satisfy following relation: inner thread piece 1 and external thread piece 2 tighten socket the time the secondary hermetically-sealed construction in first road is contacted earlier than the secondary hermetically-sealed construction in second road reach sealing, promptly the interior bevel sealing surface 123 of turning one's head of the chamfering shoulder male cone (strobilus masculinus) 223 of external thread piece 2 and inner thread piece 1 reaches earlier with the interior bevel sealing surface 122 of inner thread piece 1 than the outer bevel sealing surface 222 of external thread piece 2 and contacts cooperation.
The present invention is not limited to above-mentioned concrete structure, just drops within protection scope of the present invention so long as have pipe screw joint identical with the present invention or the primary seal structure that is equal to, the secondary hermetically-sealed construction in first road and the secondary hermetically-sealed construction in second road.
Claims (8)
1. pipe screw joint, it comprises inner thread piece (1) and external thread piece (2); It is characterized in that: inner thread piece (1) comprises interior seal section (12), and the inwall of interior seal section (12) is provided with interior column sealed (121), interior bevel sealing surface (122) and later interior bevel sealing surface (123); External thread piece (2) comprises external seal section (22), and the periphery of external seal section (22) is provided with evagination circular arc sealing surface (221), outer bevel sealing surface (222) and chamfering shoulder male cone (strobilus masculinus) (223); The evagination circular arc sealing surface (221) of external thread piece (2) is an interference fit with interior column sealed (121) of inner thread piece (1), and its magnitude of interference is designated as δ D, forms the primary seal structure; The chamfering shoulder male cone (strobilus masculinus) (223) of external thread piece (2) is turned one's head interior bevel sealing surface (123) for conical surface contact seal cooperates with inner thread piece (1), forms the secondary hermetically-sealed construction in first road; The outer bevel sealing surface (222) of external thread piece (2) and the interior bevel sealing surface (122) of inner thread piece (1) form the secondary hermetically-sealed construction in second road for conical surface contact seal cooperates.
2. pipe screw joint according to claim 1, it is characterized in that: described inner thread piece (1) also comprises internal thread segment (11), the internal thread (112) of internal thread segment (11) is a tapered thread, the tapering of conical internal thread (112) is 1: 16, and the thread type of internal thread (112) is a buttress thread; External thread piece (2) also comprises external thread section (21), external thread section (21) is provided with conical external screw thread (211), the tapering of the conical external screw thread (211) of external thread section (21) is 1: 16, the thread type of the external screw thread (211) of conical external screw thread section (21) is a buttress thread, the conical external screw thread (211) of the external thread section (21) of external thread piece (2) is the interference threaded engagement with the conical internal thread (112) of the internal thread segment (11) of inner thread piece (1), and its magnitude of interference is designated as δ d.
3. pipe screw joint according to claim 2 is characterized in that: the magnitude of interference δ D of interference fit is greater than the magnitude of interference δ d of interference fit between the conical internal thread (112) of the internal thread segment (11) of the conical external screw thread (211) of the external thread section (21) of external thread piece (2) and inner thread piece (1) between the evagination circular arc sealing surface (221) of described external thread piece (2) and interior column sealed (121) of inner thread piece (1); And the pressure that magnitude of interference δ D brings is less than the material yield intensity of pipe screw joint.
4. according to claim 1 or 2 or 3 described pipe screw joints, it is characterized in that: the angle that the cone element of the interior bevel sealing surface (122) of described inner thread piece (1) is become with axial line equals 30 degree, the angle that the cone element of bevel sealing surface (123) is become with radial line later equals 25 degree, and interior bevel sealing surface (122) is connected by arc surface (124) with later interior bevel sealing surface (123); The angle that the cone element of the outer bevel sealing surface (222) of external thread piece (2) is become with axial line equals 30 degree, the angle that the cone element of chamfering shoulder male cone (strobilus masculinus) (223) is become with radial line equals 25 degree, evagination circular arc sealing surface (221) is connected by arc surface (224) with outer bevel sealing surface (222), and outer bevel sealing surface (222) is connected by arc surface (225) with chamfering shoulder male cone (strobilus masculinus) (223).
5. pipe screw joint according to claim 4 is characterized in that: the radius of curvature of the arc surface (225) of described external thread piece (2) is greater than the radius of curvature of the arc surface (124) of inner thread piece (1).
6. according to claim 1 or 2 or 3 described pipe screw joints; It is characterized in that: the tolerance of described first secondary sealing structure and the secondary sealing of second structure can satisfy following relation: inner thread piece (1) and external thread piece (2) tighten socket the time the secondary sealing of first structure is reached first than the secondary sealing of second structure contact sealing, namely when tightening of inner thread piece (1) and external thread piece (2) is socketed outside the chamfering shoulder of external thread piece (2) in the turning one's head of the conical surface (223) and inner thread piece (1) bevel sealing surface (123) to reach first with the interior bevel sealing surface (122) of inner thread piece (1) than the outer bevel sealing surface (222) of external thread piece (2) and contact cooperation.
7. pipe screw joint according to claim 4; It is characterized in that: the tolerance of described first secondary sealing structure and the secondary sealing of second structure can satisfy following relation: inner thread piece (1) and external thread piece (2) tighten socket the time the secondary sealing of first structure is reached first than the secondary sealing of second structure contact sealing, namely when tightening of inner thread piece (1) and external thread piece (2) is socketed outside the chamfering shoulder of external thread piece (2) in the turning one's head of the conical surface (223) and inner thread piece (1) bevel sealing surface (123) to reach first with the interior bevel sealing surface (122) of inner thread piece (1) than the outer bevel sealing surface (222) of external thread piece (2) and contact cooperation.
8. pipe screw joint according to claim 5; It is characterized in that: the tolerance of described first secondary sealing structure and the secondary sealing of second structure can satisfy following relation: inner thread piece (1) and external thread piece (2) tighten socket the time the secondary sealing of first structure is reached first than the secondary sealing of second structure contact sealing, namely when tightening of inner thread piece (1) and external thread piece (2) is socketed outside the chamfering shoulder of external thread piece (2) in the turning one's head of the conical surface (223) and inner thread piece (1) bevel sealing surface (123) to reach first with the interior bevel sealing surface (122) of inner thread piece (1) than the outer bevel sealing surface (222) of external thread piece (2) and contact cooperation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010200313A CN101864908A (en) | 2010-06-10 | 2010-06-10 | Threaded connector for pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010200313A CN101864908A (en) | 2010-06-10 | 2010-06-10 | Threaded connector for pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101864908A true CN101864908A (en) | 2010-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010200313A Pending CN101864908A (en) | 2010-06-10 | 2010-06-10 | Threaded connector for pipes |
Country Status (1)
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| CN (1) | CN101864908A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071881A (en) * | 2010-12-08 | 2011-05-25 | 中国石油集团石油管工程技术研究院 | Hermetic threaded joint of sleeve for gas well |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| CN102720439A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-tightness buttress thread sleeve joint |
| CN103292073A (en) * | 2013-06-04 | 2013-09-11 | 无锡金顶石油管材配件制造有限公司 | Petroleum pipe end connector |
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN103628827A (en) * | 2012-08-20 | 2014-03-12 | 东港市东方高新金属材料有限公司 | Anti-bonding three-stage end surface metal sealing threaded connector for titanium alloy pipe |
| CN107780852A (en) * | 2016-08-24 | 2018-03-09 | 杰富意钢铁株式会社 | Threaded joint for oil well pipe |
| CN108952595A (en) * | 2018-06-01 | 2018-12-07 | 江苏常宝钢管股份有限公司 | A kind of air-tight seal screw joint |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2160609A (en) * | 1984-06-20 | 1985-12-24 | Nippon Kokan Kk | A screw joint coupling for oil pipes |
| CN2278761Y (en) * | 1996-09-25 | 1998-04-15 | 宝山钢铁(集团)公司 | Threaded joint for oil well pipe |
| CN201377293Y (en) * | 2008-08-07 | 2010-01-06 | 无锡法斯特能源开发科技有限公司 | Screwed nipple for air-seal oil pipe |
| CN201738836U (en) * | 2010-06-10 | 2011-02-09 | 衡阳鸿菱石油管材有限责任公司 | Threading connector for pipes |
-
2010
- 2010-06-10 CN CN201010200313A patent/CN101864908A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2160609A (en) * | 1984-06-20 | 1985-12-24 | Nippon Kokan Kk | A screw joint coupling for oil pipes |
| CN2278761Y (en) * | 1996-09-25 | 1998-04-15 | 宝山钢铁(集团)公司 | Threaded joint for oil well pipe |
| CN201377293Y (en) * | 2008-08-07 | 2010-01-06 | 无锡法斯特能源开发科技有限公司 | Screwed nipple for air-seal oil pipe |
| CN201738836U (en) * | 2010-06-10 | 2011-02-09 | 衡阳鸿菱石油管材有限责任公司 | Threading connector for pipes |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071881A (en) * | 2010-12-08 | 2011-05-25 | 中国石油集团石油管工程技术研究院 | Hermetic threaded joint of sleeve for gas well |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| CN102720439A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-tightness buttress thread sleeve joint |
| CN103628827A (en) * | 2012-08-20 | 2014-03-12 | 东港市东方高新金属材料有限公司 | Anti-bonding three-stage end surface metal sealing threaded connector for titanium alloy pipe |
| CN103628827B (en) * | 2012-08-20 | 2016-03-30 | 东港市东方高新金属材料有限公司 | Anti-stick button three grades of end plane metal sealing titanium compo pipe nipples |
| CN103292073A (en) * | 2013-06-04 | 2013-09-11 | 无锡金顶石油管材配件制造有限公司 | Petroleum pipe end connector |
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN103422819B (en) * | 2013-08-30 | 2016-12-07 | 宝山钢铁股份有限公司 | A kind of air-tight seal connecting structure for oil well pipe |
| CN107780852A (en) * | 2016-08-24 | 2018-03-09 | 杰富意钢铁株式会社 | Threaded joint for oil well pipe |
| CN107780852B (en) * | 2016-08-24 | 2022-03-29 | 杰富意钢铁株式会社 | Threaded joint for oil well pipe |
| CN108952595A (en) * | 2018-06-01 | 2018-12-07 | 江苏常宝钢管股份有限公司 | A kind of air-tight seal screw joint |
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Application publication date: 20101020 |