CN108301786B - Special thread-locking joint - Google Patents
Special thread-locking joint Download PDFInfo
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- CN108301786B CN108301786B CN201810319628.6A CN201810319628A CN108301786B CN 108301786 B CN108301786 B CN 108301786B CN 201810319628 A CN201810319628 A CN 201810319628A CN 108301786 B CN108301786 B CN 108301786B
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- 238000007789 sealing Methods 0.000 claims abstract description 48
- 230000007704 transition Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 13
- 238000005452 bending Methods 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention relates to a special threaded joint, which comprises a box and a pin with metal contact surfaces, wherein the metal contact surfaces comprise threaded part contact and non-threaded part contact. The thread part contact comprises contact of the tooth top of the female buckle inner thread and the tooth bottom of the male buckle outer thread, and contact of bearing surfaces of the inner thread and the outer thread. The non-thread contact includes inner and outer thread sealing surface contact, first conical surface contact of the inner and outer threads, and step surface contact of the inner and outer threads. After the threaded joint is screwed up, the sealing surfaces of the internal thread and the external thread form interference fit, so that the sealing effect is achieved. Compared with the prior art, the invention integrates high connection strength, high compression resistance, high torque resistance, high bending resistance, high temperature resistance and other high performances, is convenient for field actual operation and reduces the abnormal production time of a first company.
Description
Technical Field
The invention relates to a special threaded buckle joint, in particular to an improved buttress thread and a high-performance special threaded buckle joint with a certain distance between a sealing surface and a step surface, which are suitable for the petroleum and natural gas industry, in particular to an oil-gas well with higher requirements on the comprehensive performance of a pipe joint.
Background
In recent years, with the increasing difficulty of exploitation of conventional oil and gas wells and the year-by-year increase of the production of unconventional oil and gas, and the experimental exploitation of energy sources such as hot-melt rock wells, combustible ice and the like, the comprehensive performance requirements on pipe joints are higher and higher.
The existing API (american petroleum institute) threaded joint and other special fastening joints can only meet one or a plurality of high performances, such as high tensile strength, high compression strength or high tensile strength, high torsion resistance and the like, so that oil and gas well pipe manufacturing companies need to design different joint structures according to different requirements on site. Therefore, it is highly demanded to develop a special screw thread buckle joint which can simultaneously meet the high performances of high tensile strength, high compression resistance, high torsion resistance, high bending resistance, high temperature resistance and the like.
In the low-rise period of the oil and gas industry in recent years, various special buckling joints are used at the field at present, the sealing conical surface is often damaged by external hard substances due to the design structure, and in the buckling process, the thread teeth are worn in the buckling and screwing process due to eccentric cross buckling. Therefore, a new special threaded joint structure needs to be designed, so that problems in the field application stage are avoided as much as possible, and the abnormal operation time of oil and gas exploration and exploitation companies is prolonged.
Disclosure of Invention
The invention aims to provide a special threaded joint which integrates high performances such as high tensile strength, high compression resistance, high torsion resistance, high bending resistance, high temperature resistance and the like, is convenient for field operation, reduces damage to products and increases abnormal operation time of a first company.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
A special threaded joint comprises a female buckle and a male buckle, wherein the female buckle structure comprises an internal threaded section and a non-threaded section, and the male buckle structure comprises an external threaded section and a non-threaded section; the female buckle is characterized in that the thread tooth structure of the female buckle inner thread section is a buttress thread tooth, the non-thread section comprises a sealing conical surface, a first conical surface, a second conical surface and an inner step surface, and the non-thread section and the inner thread section are smoothly transited through a cylindrical surface; smooth transition is realized between the step surface and the non-threaded section through a circular groove;
the female buckle internal thread section thread tooth comprises a tooth top, a tooth bottom, a guide surface and a bearing surface, wherein the tooth top and the tooth bottom are parallel to the central axis of the pipe body, the bearing surface angle phi 2 is 1-4 degrees, the guide surface angle phi 1 is 10-15 degrees, and a chamfer phi 20-40 degrees is processed on the guide surface;
the thread tooth structure of the male thread section is an buttress thread tooth, and the non-thread section comprises a sealing conical surface, a second conical surface, a first conical surface and a step surface.
The female buckle internal thread section thread is matched with the male buckle external thread section thread, after the male buckle is completely screwed into the female buckle, the first conical surface of the female buckle contacts with the first conical surface of the male buckle, and the female buckle sealing conical surface (5) contacts with the male buckle sealing conical surface;
The male buckle external thread section thread tooth comprises a tooth top, a tooth bottom, a guide surface and a bearing surface, wherein the tooth top and the tooth bottom are parallel to the central axis of the pipe body, the bearing surface angle phi 4 is 1-4 degrees, and the guide surface angle phi 3 is 10-15 degrees.
The taper of the thread teeth of the female thread section and the male thread section (III) is 1;20-1:17.
The number of threads is 4-6 threads per inch.
The cone angle theta 1 of the sealing cone surface of the female buckle non-threaded section is 7-15 degrees, the cone angle theta 3 of the second cone surface is 1.43-1.79 degrees, the cone angle beta 1 of the first cone surface is 15-25 degrees, and the thickness T 1 of the cylindrical surface between the threaded section and the non-threaded section is more than or equal to the thickness T 2 from the thread root of the thread ending of the internal thread section to the outer wall;
The cone angle theta 2 of the sealing cone surface of the pin non-threaded section is 7 degrees to 15 degrees, the cone angle theta 4 of the second cone surface is 1.43 degrees to 1.79 degrees, and the cone angle beta 2 of the first cone surface is 15 degrees to 25 degrees; the angle alpha 2 of the step surface is 0-15 degrees in the reverse direction, and the distance L 2 between the step surface and the sealing conical surface is 8-14mm.
The fillet radius of the transition fillet groove between the inner step surface of the female buckle and the non-threaded section is 0.6-1.0mm; the angle alpha 1 of the inner step surface is 0-15 degrees in the reverse direction, and the distance L 1 between the inner step surface and the sealing conical surface is 10-15mm.
The pin seal conical surface is positioned below a connecting line H between a first thread contact point of the thread and the first conical surface (11) and a second conical surface contact point b, and the vertical distance H is smaller than 1.2mm.
The total surface area of the chute processed on the first conical surface of the male buckle is smaller than 30% of the surface area of the first conical surface, and the total surface area of the chute processed on the step surface is smaller than 30% of the surface area of the step surface.
After the male buckle is completely screwed into the female buckle, the contact interference between the first conical surface of the female buckle and the first conical surface of the male buckle is 0.35-1.2mm, and the contact interference between the sealing conical surface of the female buckle and the sealing conical surface of the male buckle is 0.33-1.14mm.
The invention has the advantages that: the improved buttress thread and the high-performance special threaded buckle joint with the sealing surface position and the step surface separated by a certain distance achieve the aim of integrating high tensile strength, high compression resistance, high torsion resistance, high bending resistance, high temperature resistance and other high performances by improving the thread tooth structure, changing the sealing conical surface position and changing the contact interference of the first conical surface and the interference of the sealing conical surface, and are convenient for field actual operation, reducing the damage of external factors to products during operation and being beneficial to reducing the abnormal operation time of oil and gas exploration and exploitation companies.
Drawings
FIG. 1 is a schematic diagram of the mating structure of a female buckle A and a male buckle B in the invention;
FIG. 2 is a schematic structural view of a female buckle A according to the present invention;
FIG. 3 is an enlarged schematic view of the non-threaded section of the box A of the present invention;
FIG. 4 is an enlarged schematic view of the internal thread section of the box A of the present invention;
FIG. 5 is a schematic structural view of the pin B of the present invention;
FIG. 6 is an enlarged schematic view of the male buckle B non-threaded section of the present invention;
FIG. 7 is an enlarged schematic view of the male thread section of the pin B of the present invention;
FIG. 8 is a schematic view of the structure of the male buckle B non-threaded section groove in the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
The invention relates to a special threaded joint, as shown in figure 1, comprising a box A and a pin B, as shown in figure 2, wherein the box A structure comprises an internal thread section II and a non-thread section I, the thread tooth structure of the internal thread section II of the box A is a buttress thread tooth, the non-thread section I comprises a sealing conical surface 5, a first conical surface 3, a second conical surface 4 and an internal step surface 1, and the non-thread section I and the internal thread section II are smoothly transited through a cylindrical surface 21; the step surface and the non-threaded section I are in smooth transition through the circular angle groove 2, so that a space is provided for plastic deformation of the first conical surface, and the integral compression resistance and high temperature resistance of the joint are improved when the joint bears high temperature or high pressure and even under the action of a composite load of high Wen Zhi load and axial high pressure.
As shown in fig. 5, the pin B structure includes an external thread section iii, which is a buttress thread, and a non-thread section iv, which includes a sealing conical surface 13, a second conical surface 12, a first conical surface 11, and a step surface 10.
The male buckle B and the female buckle A are both provided with the second conical surfaces, so that the distance between the sealing surface and the step surface is increased, the possibility that external hard substances touch the sealing surface can be reduced, the radial stress generated when the step surface is contacted after the male buckle and the female buckle are screwed up is ensured to be uniformly distributed, and the bending resistance of the joint is improved.
In actual operation, the male buckle B is sleeved into the female buckle A through the buckle butt-joint device, and is screwed into the female buckle A at a low rotation speed for about 2 circles after the buckle is sleeved, and then is screwed into the female buckle A at a rotation speed of about 15 circles per minute until the last 1-2 circles, and is further screwed into a preset position at a rotation speed of less than 5 circles per minute; after the male buckle B is completely screwed and sleeved into the female buckle A, the first conical surface 3 of the female buckle A is contacted with the first conical surface 11 of the male buckle B, and the sealing conical surface 5 of the female buckle A is contacted with the sealing conical surface 13 of the male buckle B; the contact interference between the first conical surface 3 of the box A and the first conical surface 11 of the pin B is 0.35-1.2mm, the contact interference between the sealing conical surface 5 of the box A and the sealing conical surface 13 of the pin B is 0.33-1.14mm, and in practice, as the outer diameter size range of a pipe body of a threaded joint is 127-355.6 mm, different contact interference aims at different outer diameter sizes of the pipe body. The contact interference magnitude of the first conical surface is larger than that of the sealing surface, so that when the joint bears high temperature and high axial compression load, the first conical surface is subjected to plastic deformation, and the high temperature resistance and compression resistance of the joint are improved.
As shown in fig. 4, the female buckle a internal thread section ii thread comprises a tooth top 7, a tooth bottom 9, a guide surface 8 and a bearing surface 6, wherein the tooth top 7 and the tooth bottom 9 are parallel to the central axis of the pipe body, and the compression resistance of the joint is improved. The bearing surface 6 has an angle phi 2 of 1-4 degrees, preferably 3 degrees, the guide surface 8 has an angle phi 1 of 10-15 degrees, preferably 12 degrees, and the guide surface 8 has a chamfer phi 20-40 degrees, preferably 30 degrees, so that the joint cannot be cross-buckled in the buckling process; the taper of the thread tooth is 1;20-1:17, a preferred taper is 1:17.5, the number of threads is 4-6 threads per inch.
As shown in fig. 6, the thread of the male buckle B external thread section iii comprises a tooth top 19, a tooth bottom 17, a guide surface 18 and a bearing surface 16, wherein the tooth top 19 and the tooth bottom 17 are parallel to the central axis of the pipe body, the bearing surface 16 has an angle phi 4 of 1-4 degrees, preferably 3 degrees, the guide surface 18 has an angle phi 3 of 10-15 degrees, preferably has an angle of 12 degrees, and the taper of the thread is 1;20-1:17, a preferred taper is 1:17.5, the number of threads is 4-6 threads per inch.
Referring to fig. 3, the taper angle θ 1 of the sealing taper surface 5 of the non-threaded section I of the box a is 7 ° -15 °, the taper angle θ 3 of the second taper surface 4 is 1.43 ° -1.79 ° for different pipe wall thicknesses, the taper angle β 1 of the first taper surface 3 is 15 ° -25 °, the preferred angle is 20 °, the thickness T 1 of the cylindrical surface 21 between the threaded section ii and the non-threaded section I is greater than or equal to the thickness T 2 from the thread root of the internal thread section to the outer wall, and the thickness T 2 from the thread root of the internal thread section to the outer wall is slightly greater than the pipe wall thickness T.
The angle gamma of the connecting line between the sealing conical surface 5 and the cylindrical surface 21 is 30 degrees to 45 degrees, the cylindrical surface 21 is the connecting space of the internal thread section II and the non-thread section I, and a space is provided for the withdrawal of the thread cutter during the processing of the internal thread, so that the thread cutter is prevented from touching the sealing conical surface. Meanwhile, the thickness from the thread tooth root at the thread end of the internal thread section to the outer wall is slightly larger than the wall thickness T of the pipe body, so that the tensile strength of the joint is larger than that of the pipe body.
The fillet radius of the transition circular angle groove 2 between the inner step surface 1 of the female buckle A and the non-threaded section I is 0.6-1.0mm; the more preferable radius of the round angle is 0.9mm, which is favorable for selecting a proper cutter for processing and ensures the round angle groove and the inner step surface to smoothly transition; the angle alpha 1 of the inner step surface 1 is 0-15 degrees in the reverse angle, the inner step surface 1 and the first conical surface 3 are in smooth transition connection through a circular angle groove 2, and the circular angle groove 2 has the function of providing a space for yield deformation and creep deformation generated by overlarge load applied to 10-30 degrees of the first conical surface 3 when the joint bears compression or high-temperature load; a second conical surface 4 (the cone angle theta 3 is 1.43-1.79 DEG) structure is additionally arranged between the inner step surface 1 and the sealing conical surface 5, so that the distance L 1 -15mm between the inner step surface 1 and the sealing conical surface 5 is formed.
As shown in fig. 7, the taper angle θ 2 of the sealing taper surface 13 of the non-threaded section iv of the pin B is 7 ° -15 °, the taper angle θ 4 of the second taper surface 12 is 1.43 ° -1.79 ° for different pipe wall thicknesses, the taper angle β 2 ° -25 ° of the first taper surface 11 is preferably 20 °; the angle alpha 2 of the step surface 10 is a reverse angle of 0-15 degrees, and the distance L 2 between the step surface 10 and the sealing conical surface 13 is 8-14mm; the bore 14 bored out of the port is flush with the box bore 20, avoiding turbulence of the fluid in the tube at that location. The inner bore 14 and the inner wall of the tube body are in smooth transition 15.
The sealing conical surface 13 of the pin thread B is positioned below a connecting line H of a first thread contact point a and a joint point B of the first conical surface 11 and the second conical surface 12, and the vertical distance H is smaller than 1.2mm.
Compared with the prior art, the invention achieves the aim of integrating high performances such as high tensile strength, high compression resistance, high torsion resistance, high bending resistance, high temperature resistance and the like by improving the thread tooth structure and changing the position of the sealing conical surface and the difference of the contact interference of the first conical surface and the interference of the sealing conical surface, and has the advantages that the compression resistance is improved by 30 percent, the bending resistance is improved by 32 percent, the high temperature resistance is improved by 40 percent, the highest tolerable temperature can reach 220 ℃, and the fastening torque is improved by about 3400N.M by comparing the same material (steel grade P110) with the same size (the outer diameter of the pipe body of 177.8mm and the inner diameter of the pipe body of 157.08 mm).
As shown in fig. 8, the first and second conical surfaces and the step surface of the pin thread B are respectively provided with a plurality of inclined grooves, which are beneficial to extruding excessive screw thread oil in the screwing process after the operator in the field smears the excessive screw thread oil. The total surface area of the chute 11-1 processed on the first conical surface 11 is less than 30% of the surface area of the first conical surface 11, and the number of the chute is 2-4; the total surface area of the inclined grooves 10-1 processed on the step surface 10 is less than 30% of the surface area of the step surface 10, and the number of the inclined grooves is 2-4. If the chute surface area is too large, the compression and torsion resistance of the particular stab joint will be affected. Meanwhile, the chute has the function of ensuring that a space formed between the second conical surfaces of the male buckle and the female buckle and the inner hole of the pipe body are kept smooth after the joint is screwed.
The foregoing description is merely illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Equivalent changes and modifications are intended to be within the scope of the present invention as defined in the appended claims.
Claims (8)
1. A special threaded joint comprises a box (A) and a pin (B), wherein the box (A) comprises an internal thread section (II) and a non-thread section (I), and the pin (B) comprises an external thread section (III) and a non-thread section (IV); the female buckle is characterized in that the thread structure of an internal thread section (II) of the female buckle (A) is an buttress thread, a non-thread section (I) comprises a sealing conical surface (5), a first conical surface (3), a second conical surface (4) and an internal step surface (1), and the non-thread section (I) and the internal thread section (II) are in smooth transition through a cylindrical surface (21); smooth transition is realized between the step surface and the non-threaded section (I) through a circular angle groove (2);
the female buckle (A) internal thread section (II) thread tooth comprises a tooth top (7), a tooth bottom (9), a guide surface (8) and a bearing surface (6), wherein the tooth top (7) and the tooth bottom (9) are parallel to the central axis of the pipe body, the bearing surface (6) has an angle phi 2 of 1-4 degrees, the guide surface (8) has an angle phi 1 of 10-15 degrees, and the guide surface (8) is provided with a chamfer phi 20-40 degrees;
The thread tooth structure of the male buckle (B) external thread section (III) is a buttress thread tooth, and the non-thread section (IV) comprises a sealing conical surface (13), a second conical surface (12), a first conical surface (11) and a step surface (10);
the female buckle (A) is characterized in that the threads of the female thread section (II) are matched with the threads of the male buckle (B) and the male buckle (III), after the male buckle (B) is completely screwed into the female buckle (A), the first conical surface (3) of the female buckle (A) is contacted with the first conical surface (11) of the male buckle (B), and the sealing conical surface (5) of the female buckle (A) is contacted with the sealing conical surface (13) of the male buckle (B);
The male buckle (B) external thread section (III) thread tooth comprises a tooth top (19), a tooth bottom (17), a guide surface (18) and a bearing surface (16), wherein the tooth top (19) and the tooth bottom (17) are parallel to the central axis of the pipe body, the bearing surface (16) angle phi 4 is 1-4 degrees, and the guide surface (18) angle phi 3 is 10-15 degrees.
2. The special thread-snap joint of claim 1, wherein: the taper of the thread teeth of the inner thread section (II) of the female buckle (A) and the outer thread section (III) of the male buckle (B) is 1;20-1:17.
3. The special thread-snap joint of claim 2, wherein: the number of threads is 4-6 threads per inch.
4. The special thread-snap joint of claim 1, wherein: the taper angle theta 1 of the sealing conical surface (5) of the non-threaded section (I) of the box (A) is 7-15 degrees, the taper angle theta 3 of the second conical surface (4) is 1.43-1.79 degrees, the taper angle beta 1 of the first conical surface (3) is 15-25 degrees, and the thickness T 1 of the cylindrical surface (21) between the threaded section (II) and the non-threaded section (I) is more than or equal to the thickness T 2 from the thread ending thread tooth root of the internal thread section to the outer wall;
The taper angle theta 2 of the sealing conical surface (13) of the non-threaded section (IV) of the pin (B) is 7 degrees to 15 degrees, the taper angle theta 4 of the second conical surface (12) is 1.43 degrees to 1.79 degrees, and the taper angle beta 2 of the first conical surface (11) is 15 degrees to 25 degrees; the angle alpha 2 of the step surface (10) is a reverse angle of 0-15 degrees, and the distance L 2 between the step surface and the sealing conical surface is 8-14mm.
5. The special thread-snap joint of claim 1, wherein: the fillet radius of the transition fillet groove (2) between the inner step surface (1) of the female buckle (A) and the non-threaded section (I) is 0.6-1.0mm; the angle alpha 1 of the inner step surface (1) is a reverse angle of 0-15 degrees, and the distance L 1 between the inner step surface (1) and the sealing conical surface (5) is 10-15mm.
6. The special thread-snap joint of claim 1, wherein: the male buckle (B) sealing conical surface (13) is positioned below a connecting line H of a first thread contact point (a) of the thread and a joint point B of the first conical surface (11) and the second conical surface (12), and the vertical distance H is smaller than 1.2mm.
7. The special thread-locking joint of claim 6, wherein: the total surface area of the chute (11-1) processed by the male buckle (B) on the first conical surface (11) is smaller than 30% of the surface area of the first conical surface (11), and the total surface area of the chute (10-1) processed by the step surface (10) is smaller than 30% of the surface area of the step surface (10).
8. The special thread-snap joint of claim 1, wherein: after the male buckle (B) is completely screwed into the female buckle (A), the contact interference between the first conical surface (3) of the female buckle (A) and the first conical surface (11) of the male buckle (B) is 0.35-1.2mm, and the contact interference between the sealing conical surface (5) of the female buckle (A) and the sealing conical surface (13) of the male buckle (B) is 0.33-1.14mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319628.6A CN108301786B (en) | 2018-04-11 | 2018-04-11 | Special thread-locking joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319628.6A CN108301786B (en) | 2018-04-11 | 2018-04-11 | Special thread-locking joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108301786A CN108301786A (en) | 2018-07-20 |
| CN108301786B true CN108301786B (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810319628.6A Active CN108301786B (en) | 2018-04-11 | 2018-04-11 | Special thread-locking joint |
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| CN (1) | CN108301786B (en) |
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| CN201288903Y (en) * | 2008-09-28 | 2009-08-12 | 上海海隆石油管材研究所 | Oil sleeve screwed connection head of negative bearing angle |
| CN201507731U (en) * | 2009-06-05 | 2010-06-16 | 江苏胜大石油设备制造有限公司 | Oil casing threaded connection joint |
| CN201496000U (en) * | 2009-08-20 | 2010-06-02 | 四川华工石油钢管有限责任公司 | Structure of hermetically sealed joint of oil pipe or sleeve |
| CN201502335U (en) * | 2009-10-05 | 2010-06-09 | 胜利油田胜机石油装备有限公司 | Oil sleeve joint |
| CN102678071A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread sleeve connection joint |
| CN203835287U (en) * | 2014-04-30 | 2014-09-17 | 宝鸡石油钢管有限责任公司 | Air sealing type threaded connector structure provided with large-angle guiding surface and applied to oil casing |
| CN208502683U (en) * | 2018-04-11 | 2019-02-15 | 张祖林 | A kind of special thread buckle joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108301786A (en) | 2018-07-20 |
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