CN113027352A - Drill rod joint for coal mining - Google Patents
Drill rod joint for coal mining Download PDFInfo
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- CN113027352A CN113027352A CN202110323404.4A CN202110323404A CN113027352A CN 113027352 A CN113027352 A CN 113027352A CN 202110323404 A CN202110323404 A CN 202110323404A CN 113027352 A CN113027352 A CN 113027352A
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- thread
- internal thread
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- 238000005065 mining Methods 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000013329 compounding Methods 0.000 claims abstract description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
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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)
- Earth Drilling (AREA)
Abstract
The invention discloses a drill rod joint for coal mining, which comprises a male joint with an external thread and a female joint with an internal thread; the female joint is meshed with the male joint, and the thread tooth tops and the thread tooth bottoms of the internal thread and the external thread are arc-shaped; the method is characterized in that: the external thread comprises an external thread bearing surface and an external thread guide surface, the angle of the external thread bearing surface is 30 degrees, and the angle of the external thread guide surface is 45 degrees; the internal thread comprises an internal thread bearing surface and an internal thread guide surface, the angle of the internal thread guide surface is 45 degrees, the internal thread bearing surface is formed by compounding a straight line segment with a horizontal plane angle of 90 degrees and a straight line segment with a horizontal plane angle of 30 degrees, and the straight line segment with the angle of 90 degrees is positioned between an internal thread tooth bottom circular arc segment and the straight line segment with the angle of 30 degrees. The stress concentration degree between the internal thread and the external thread of the drill rod joint is smaller, and the service life of the threads can be prolonged.
Description
Technical Field
The invention relates to the technical field of processing of a mining drill rod joint, in particular to a drill rod joint for coal mining.
Background
The purpose of the mining drill rod is to drill a coal seam, and the drill rod sends mud to a drill bit through a cavity in the drill rod and drives the drill bit to rotate. One drill rod is connected by a thread to form a drill string. The drill string needs to bear loads such as torsion, bending, compression, tension, internal pressure and the like, particularly, most of the loads are dynamic loads, the stress condition is harsh, and the requirement on connecting threads is high.
The common drill pipe is manufactured according to the API standard, and the basic structure of the common drill pipe is that an external thread joint and an internal thread joint are respectively welded at two ends of a drill pipe body. FIG. 1 is an axial cross-sectional view of a male and female API standard tool joint after make-up, and FIG. 2 is an enlarged view of B of FIG. 1. The API profile is a triangular round thread with a leading face angle and a load face angle of 30 °. The drill rod is mainly used for oil and natural gas exploitation and can also be used for coal. In the figure 1, the connector comprises a male connector provided with external threads A2 and a female connector provided with internal threads A1, and the male connector is screwed into the female connector from right to left to be connected with the female connector in a threaded mode. As shown in fig. 2, the engaged internal and external threads do not have radial interference, and the left side of the threads is a guide surface side B2, and the right side of the threads is a bearing surface side B1; when the existing threads are meshed and pulled, the internal threads on the guide surface side B2 and the guide surfaces of the external threads are separated from contact and are not stressed, the thread bearing surface on the bearing surface side B1 is stressed most, but the place with the most serious stress concentration is the tooth bottom B3 of the internal threads, and the stress concentration is serious, so that the probability of failure accidents such as thread breakage, button expansion and the like can be improved.
In practical application, the failure of the thread ridge is a common failure mode of the mining drill pipe joint, and the failure is often started from the first two threads of the thread stressed. In addition, the mining drill rod often needs surface spraying treatment, and the thread with edges often causes uneven spraying.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a drill rod joint for coal mining, which mainly solves the technical problems that threads are frequently broken and buckled due to severe stress concentration in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme:
a drill rod joint for coal mining comprises a male joint with external threads and a female joint with internal threads; the female joint is meshed with the male joint, and the thread tooth tops and the thread tooth bottoms of the internal thread and the external thread are arc-shaped; the method is characterized in that: the external thread comprises an external thread bearing surface and an external thread guide surface, the angle of the external thread bearing surface is 30 degrees, and the angle of the external thread guide surface is 45 degrees; the internal thread comprises an internal thread bearing surface and an internal thread guide surface, the angle of the internal thread guide surface is 45 degrees, the internal thread bearing surface is formed by compounding a straight line segment with a horizontal plane angle of 90 degrees and a straight line segment with a horizontal plane angle of 30 degrees, and the straight line segment with the angle of 90 degrees is positioned between an internal thread tooth bottom circular arc segment and the straight line segment with the angle of 30 degrees.
Further, the 90-degree straight line segment and the 30-degree straight line segment are in transition through a circular arc.
Further, the length ratio of the 90-degree linear segment to the 30-degree linear segment is between 1:16 and 1: 18.
Furthermore, two threads on the leftmost side and two threads on the rightmost side in the axial direction of the female joint sink, and a certain gap is reserved between the two threads and the corresponding external thread bearing surface.
Further, the taper of the external thread is 1: 16; the thread teeth of the internal thread are distributed along a specific curve, and the curve comprises a first curve positioned at the left end, a third curve positioned at the right end and a second curve positioned in the middle; wherein, the curve two is that the conicity is 1:16 is straight; taking the left end of the curve as an original point, establishing a rectangular coordinate system, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, and Y is a point coordinate value on the Y axisThe curve formula of curve one is (x-4.5)2+(y-280.964)278961; establishing a rectangular coordinate system by taking the rightmost end of the curve three as an origin, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, Y is a point coordinate value on the Y axis, and the curve formula of the curve three is (X +7.4)2+(y-280.906)278961; the first curve relates to the two leftmost threads of the internal thread, and the third curve relates to the two rightmost threads of the internal thread.
Furthermore, a right-angle inner shoulder and an outer shoulder end surface are arranged at two ends of the female joint, and the internal thread is positioned between the right-angle inner shoulder and the outer shoulder end surface; the internal thread and the end face of the external shoulder are transited through a cylindrical hole; the male connector is characterized in that a right-angle outer shoulder and an inner shoulder end surface are arranged at two ends of the male connector, the external thread is positioned between the right-angle outer shoulder and the inner shoulder end surface, and the external thread and the right-angle outer shoulder are in transition through a cylindrical surface; the diameter of the cylindrical hole is slightly larger than that of the cylindrical surface.
Further, the axial depth of the cylindrical hole is 10.2-16.2 mm.
Furthermore, the height of the thread teeth of the external thread is 2.9-3.2mm, the height of the thread teeth of the internal thread is more than or equal to the height of the thread teeth of the external thread plus 0.8mm, and the height of the thread teeth of the external thread plus 1.3 mm.
Furthermore, the outer diameters of the female joint and the male joint are slightly larger than the outer diameter of the drill pipe body to be connected, and the female joint and the drill pipe body and the male joint and the drill pipe body are transited through conical surfaces.
(III) advantageous effects
Compared with the prior art, the invention provides a drill rod joint for coal mining, which has the following beneficial effects:
1. the bearing surface angle of the external thread is 30 degrees, and the guide surface angle is 45 degrees; the angle of the guide surface of the internal thread is 45 degrees, the bearing surface is formed by compounding two lines with the horizontal plane at angles of 90 degrees and 30 degrees, and on the basis, the tooth bottom of the internal thread is further cut, so that the stress concentration of the thread tooth can be reduced.
2. The joint is provided with a right-angle outer shoulder and a right-angle inner shoulder. When the connector is used, the outer shoulder and the inner shoulder are respectively contacted and bear the fastening torque, so that the connector has better torsion resistance.
3. Because the two teeth at the leftmost side and the two teeth at the rightmost side of the internal thread sink, and a certain gap is reserved between the two teeth and the bearing surface of the external thread teeth, the internal thread is stressed firstly when the internal thread is stressed, and the two external thread teeth are stressed after the internal thread is fully stressed, so that the stress balance of the thread teeth is facilitated. When the taper of the tapered thread is small, compared with the taper of the tapered thread with large taper, the wall thickness of the drill rod can be reduced within a certain range, so that the weight is controlled.
The joint has the advantages of convenient buckling, high torsional strength, uniform stress of thread teeth and strong bearing capacity.
Drawings
FIG. 1 is a schematic view of a prior art internal thread and external thread engagement structure of a drill pipe joint.
Fig. 2 is an enlarged view of B in fig. 1.
FIG. 3 is an axial cross-sectional view of the invention with the male and female connectors mated.
FIG. 4 is a schematic cross-sectional view of a threaded portion of the box of the present invention.
FIG. 5 is an enlarged view of the internal and external thread profiles of the present invention.
FIG. 6 is a schematic view of the engagement structure of the internal thread and the external thread of the tool joint according to the present invention.
Fig. 7 is an enlarged view of C in fig. 6.
In the figure:
a1-internal thread, A2-external thread, B1-bearing surface side, B2-guide surface side and B3-internal thread tooth bottom;
1-female joint, 2-right-angle inner shoulder, 3-internal thread, 4-cylindrical hole, 5-outer shoulder end face, 6-male joint, 7-outer shoulder, 8-cylindrical surface, 9-external thread, 10-inner shoulder end face, 11-curve I, 12-curve II, 13-curve III, 14-external thread bearing face, 15-external thread guide face, 16-internal thread bearing face, 17-internal thread guide face, L-axial depth, R-external thread tooth bottom circular arc radius, R-tooth top circular arc radius and R1-internal thread tooth bottom circular arc radius.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3 to 7, the present invention provides a drill pipe joint for coal mining, comprising a male joint 6 with an external thread 9 and a female joint 1 with an internal thread 3; the female connector 1 and the male connector 6 are connected in a meshing manner; the thread tooth tops and the thread tooth bottoms of the internal thread 3 and the external thread 9 are arc-shaped; the external thread 9 comprises an external thread bearing surface 14 and an external thread guide surface 15, the angle of the external thread bearing surface 14 is 30 degrees, and the angle of the external thread guide surface 15 is 45 degrees; the internal thread 3 comprises an internal thread bearing surface 16 and an internal thread guide surface 17, the angle of the internal thread guide surface 17 is 45 degrees, the internal thread bearing surface 16 is formed by compounding a straight line segment with a horizontal angle of 90 degrees and a straight line segment with an angle of 30 degrees, the two straight line segments are in circular arc transition, and the straight line segment with the horizontal angle of 90 degrees is located between a tooth bottom circular arc segment of the internal thread 3 and the straight line segment with the angle of 30 degrees.
As shown in fig. 5, the internal thread 3 and the external thread 9 in the present embodiment are conical threads, but have different thread forms; because the internal thread bearing surface 16 is formed by compounding a straight line segment with an angle of 90 degrees and a straight line segment with an angle of 30 degrees on the horizontal plane, the shape of the tooth bottom of the internal thread 3 is further cut on the basis; compared with the existing internal thread tooth bottom, the tooth bottom cavity of the thread 3 after internal meshing is further cut and deepened due to the fact that the 90-degree straight line segment is additionally arranged.
Compared with the engagement of the internal thread and the external thread with the same tooth type, when the internal thread 3 and the external thread 9 are engaged and stressed, the stress is more uniform, and the stress concentration ratio of the tooth bottom of the internal thread 3 is smaller.
Preferably, the ratio of the length of the 90 ° linear segment to the length of the 30 ° linear segment is between 1:16 and 1: 18. In this embodiment, the length ratio of the 90 ° straight line segment to the 30 ° straight line segment is 1: 17.7. so, 90 straightway had both realized the effect of further cutting to the tooth bottom of internal thread 3, and because of occupying length is less again, at internal thread 3 and the meshing of external screw thread 9 back of connecting, the loading face contact surface that loses is less to more be favorable to dispersing the atress between external screw thread 9 and the internal thread.
As shown in fig. 3, in the present embodiment, both ends of the female joint 1 are provided with a right-angled inner shoulder 2 and an outer shoulder end surface 5, and the internal thread 3 is located between the right-angled inner shoulder 2 and the outer shoulder end surface 5; the internal thread 3 and the external shoulder end surface 5 are transited through a cylindrical hole 4; the male connector 6 is provided with a right-angled outer shoulder 7 and an inner shoulder end surface 10 at two ends, the external thread 9 is positioned between the right-angled outer shoulder 7 and the inner shoulder end surface 10, and the external thread 9 and the right-angled outer shoulder 7 are transited through a cylindrical surface 8. The diameter of the cylindrical hole 4 is slightly larger than that of the cylindrical surface 8.
After the internal thread 3 is meshed with the external thread 9, the right-angle internal shoulder 2 is contacted with an internal shoulder end face 10, and the external shoulder end face 5 is contacted with a right-angle external shoulder 7; at the moment, the right-angle inner shoulders 2 and the right-angle outer shoulders 7 at the two ends bear the screwing-on torque simultaneously, so that the joint has better torsion resistance.
The diameter of the cylindrical hole 4 is slightly larger than that of the cylindrical surface 8, and the axial depth L of the cylindrical hole 4 is 10.2-16.2 mm; the thread height H1 of the external thread 9 is 2.9-3.2mm, and the thread height H of the internal thread 3 is H1+ 0.8-H1 +1.3 mm. In this embodiment, the axial depth L of the cylindrical hole 4 is 15.88mm, the height of the thread ridge of the external thread 9 is 3.073mm, and the height of the thread ridge of the internal thread 3 is 3.166 mm.
As shown in fig. 5 and 7, in the present embodiment, the root and the crest of the internal thread 3 and the external thread 9 are both arc-shaped, the crest arc radius R of the internal thread 3 and the crest arc radius R of the external thread 9 are the same, and the length of the internal thread root arc radius R1 is smaller than the external thread root arc radius R.
In this embodiment, the outer diameters of the female joint 1 and the male joint 6 are slightly larger than the outer diameter of the drill pipe body to be connected, and the female joint 1 and the drill pipe body, and the male joint 6 and the drill pipe body are in conical surface transition. Is favorable for protecting the drill pipe body.
As shown in fig. 4 and 6, in the present embodiment, the two leftmost threads and the two rightmost threads of the box 1 are lowered in position in the axial direction, that is, the box 1 is tapered, and after the tapering, a certain gap is left between the two leftmost inner threads and the two outermost inner threads and the corresponding outer thread bearing surface 14. The tapering process can be realized by sinking the thread positions on both sides or changing the shape of the thread.
Because the female joint 1 is subjected to taper changing treatment, a certain gap is reserved between two outer teeth of the internal thread and the matched external thread teeth after the internal thread and the external thread are meshed, after the internal thread and the external thread are tensioned, the inner thread teeth are stressed firstly, and after the inner thread teeth are fully stressed and deformed, the outer thread teeth begin to be stressed, so that the stress of the thread teeth is balanced.
In this embodiment, the taper of the external thread 9 is 1: 16; the thread ridges of the internal thread 3 are distributed along a specific curve, and the curve comprises a first curve 11 positioned at the left end, a third curve 13 positioned at the right end and a second curve 12 positioned in the middle; wherein, the second curve 12 is a taper of 1:16 is straight; taking the left end of the first curve 11 as an origin, establishing a rectangular coordinate system, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, Y is a point coordinate value on the Y axis, and the curve formula of the first curve 11 is (X-4.5)2+(y-280.964)278961; establishing a rectangular coordinate system by using the rightmost end of the curve three 13 as an origin, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, Y is a point coordinate value on the Y axis, and the curve formula of the curve three 13 is (X +7.4)2+(y-280.906)278961; the first curve 11 relates to the two leftmost threads of the internal thread 3 and the third curve 13 relates to the two rightmost threads of the internal thread 3.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A drill rod joint for coal mining comprises a male joint (6) with an external thread (9) and a female joint (1) with an internal thread (3); the female joint (1) is in meshed connection with the male joint (6), and the thread tooth tops and the thread tooth bottoms of the internal thread (3) and the external thread (9) are arc-shaped; the method is characterized in that: the external thread (9) comprises an external thread bearing surface (14) and an external thread guide surface (15), the angle of the external thread bearing surface (14) is 30 degrees, and the angle of the external thread guide surface (15) is 45 degrees; the internal thread (3) comprises an internal thread bearing surface (16) and an internal thread guide surface (17), the angle of the internal thread guide surface (17) is 45 degrees, the internal thread bearing surface (16) is formed by compounding a straight line segment with a horizontal angle of 90 degrees and a straight line segment with a horizontal angle of 30 degrees, and the straight line segment with the angle of 90 degrees is located between the circular arc segment at the tooth bottom of the internal thread (3) and the straight line segment with the angle of 30 degrees.
2. The drill pipe joint for coal mining of claim 1, wherein: and the 90-degree straight line segment and the 30-degree straight line segment are in transition through a circular arc.
3. The drill pipe joint for coal mining of claim 2, wherein: the length ratio of the 90-degree linear segment to the 30-degree linear segment is 1:16-1: 18.
4. A drill pipe joint for coal mining as claimed in claim 3, wherein: the two threads on the leftmost side and the two threads on the rightmost side in the axial direction of the female joint (1) sink, and a certain gap is reserved between the two threads and the corresponding external thread bearing surface (14).
5. The drill pipe joint for coal mining of claim 4, wherein: the taper of the external thread (9) is 1: 16; the thread ridges of the internal thread (3) are distributed along a specific curve, and the curve comprises a first curve (11) positioned at the left end, a third curve (13) positioned at the right end and a second curve (12) positioned in the middle; wherein, the curve two (12) is that the conicity is 1:16 is straight; establishing a rectangular coordinate system by taking the left end of the curve I (11) as an origin, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, Y is a point coordinate value on the Y axis, and the curve formula of the curve I (11) is (X-4.5)2+(y-280.964)278961; establishing a rectangular coordinate system by taking the rightmost end of the curve III (13) as an origin, wherein the radial direction is a Y axis, the axial direction is an X axis, X is a point coordinate value on the X axis, Y is a point coordinate value on the Y axis, and the curve formula of the curve III (13) is (X +7.4)2+(y-280.906)278961; the curve I (11) relates to only the two leftmost threads of the internal thread (3), and the curve III (13) relates to the two rightmost threads of the internal thread (3).
6. A drill pipe joint for coal mining as claimed in any one of claims 1 to 5, wherein: the two ends of the female joint (1) are provided with a right-angle inner shoulder (2) and an outer shoulder end surface (5), and the internal thread (3) is positioned between the right-angle inner shoulder (2) and the outer shoulder end surface (5); the internal thread (3) and the outer shoulder end surface (5) are transited through a cylindrical hole (4); a right-angle outer shoulder (7) and an inner shoulder end surface (10) are arranged at two ends of the male connector (6), the external thread (9) is positioned between the right-angle outer shoulder (7) and the inner shoulder end surface (10), and the external thread (9) and the right-angle outer shoulder (7) are transited through a cylindrical surface (8); the diameter of the cylindrical hole (4) is slightly larger than that of the cylindrical surface (8).
7. The drill pipe joint for coal mining of claim 6, wherein: the axial depth of the cylindrical hole (4) is 10.2-16.2 mm.
8. The drill pipe joint for coal mining of claim 7, wherein: the height of the thread teeth of the external thread (9) is 2.9-3.2mm, the height of the thread teeth of the internal thread (3) is more than or equal to the height of the thread teeth of the external thread (9) and is increased by 0.8mm, and the height of the thread teeth of the external thread (9) is less than or equal to the height of the thread teeth of the external thread (9) and is increased by 1.3 mm.
9. The drill pipe joint for coal mining of claim 8, wherein: the outer diameters of the female joint (1) and the male joint (6) are slightly larger than the outer diameter of a drill pipe body to be connected, and conical surface transition is performed between the female joint (1) and the drill pipe body and between the male joint (6) and the drill pipe body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110323404.4A CN113027352B (en) | 2021-03-26 | 2021-03-26 | Drill rod joint for coal mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110323404.4A CN113027352B (en) | 2021-03-26 | 2021-03-26 | Drill rod joint for coal mining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113027352A true CN113027352A (en) | 2021-06-25 |
| CN113027352B CN113027352B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110323404.4A Active CN113027352B (en) | 2021-03-26 | 2021-03-26 | Drill rod joint for coal mining |
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| CN (1) | CN113027352B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2863030A1 (en) * | 2003-11-28 | 2005-06-03 | Vallourec Mannesmann Oil & Gas | Tubular joint, e.g. for hydrocarbon casing, has lip extending male thread and curved seating on female threaded part, so that after plastic deformation by radial expansion, joint becomes sealed |
| CN102678068A (en) * | 2012-06-06 | 2012-09-19 | 中国石油集团渤海石油装备制造有限公司 | Toothed thread drill stem joint |
| CN108756771A (en) * | 2018-08-02 | 2018-11-06 | 上海海隆石油管材研究所 | A kind of tubing string screw connection structure |
| CN208073372U (en) * | 2018-03-07 | 2018-11-09 | 上海海隆石油管材研究所 | A kind of high torque highly anti-fatigue type nipple |
| CN110608322A (en) * | 2019-09-11 | 2019-12-24 | 江苏璞腾油气装备有限公司 | Four-wire marine riser joint |
-
2021
- 2021-03-26 CN CN202110323404.4A patent/CN113027352B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2863030A1 (en) * | 2003-11-28 | 2005-06-03 | Vallourec Mannesmann Oil & Gas | Tubular joint, e.g. for hydrocarbon casing, has lip extending male thread and curved seating on female threaded part, so that after plastic deformation by radial expansion, joint becomes sealed |
| CN102678068A (en) * | 2012-06-06 | 2012-09-19 | 中国石油集团渤海石油装备制造有限公司 | Toothed thread drill stem joint |
| CN208073372U (en) * | 2018-03-07 | 2018-11-09 | 上海海隆石油管材研究所 | A kind of high torque highly anti-fatigue type nipple |
| CN108756771A (en) * | 2018-08-02 | 2018-11-06 | 上海海隆石油管材研究所 | A kind of tubing string screw connection structure |
| CN110608322A (en) * | 2019-09-11 | 2019-12-24 | 江苏璞腾油气装备有限公司 | Four-wire marine riser joint |
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| Publication number | Publication date |
|---|---|
| CN113027352B (en) | 2022-07-01 |
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