CN113431506A - Thread structure and screwed joint system - Google Patents
Thread structure and screwed joint system Download PDFInfo
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- CN113431506A CN113431506A CN202110711617.4A CN202110711617A CN113431506A CN 113431506 A CN113431506 A CN 113431506A CN 202110711617 A CN202110711617 A CN 202110711617A CN 113431506 A CN113431506 A CN 113431506A
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- 230000007704 transition Effects 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000000994 depressogenic effect Effects 0.000 claims 2
- 238000005452 bending Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 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
-
- 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)
- Mutual Connection Of Rods And Tubes (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a thread structure, comprising: a cylindrical member including a first section and a second section along its length, the periphery of the first section extending radially outwardly to form a protrusion in the shape of a circular cylinder, the outboard end face a1 of the protrusion being disposed at an angle of 60-80 ° to the axis of the cylindrical member, the outboard end face a2 of the cylindrical member being disposed at 90 ° to the axis 5 of the cylindrical member, the included angle between the outboard end face a1 and the outboard end face a2 being 60-80 °, a thread extending helically along the second section with spaced turns of the thread. The threaded joint has good self-locking performance, the internal and external threads are not easy to generate relative axial movement, the male joint and the female joint cannot generate relative movement, and the petroleum drill rod joint can relieve strain caused by stress and relieve scratches, bending and fracture caused by stress concentration to the thread shoulder of the joint and the thread surface under the action of torque and pressure.
Description
Technical Field
The present invention relates to the field of threaded joints. More particularly, the present invention relates to a high strength thin walled threaded joint and a threaded joint system.
Background
During downhole drilling, the drilling elements comprising the drilling tool are often connected together by a threaded structure. In these connected drilling elements, the thread design is critical, the threaded joint together with the pipe string is tested for long-term bearing of composite stresses produced by tension, compression, bending, internal pressure, external pressure, temperature, etc. in the oil and gas well, the weakest part in the pipe string is the threaded connection, the quality of the thread is good or bad, and the service life of the oil and gas well is directly affected. Through investigation, about 64% of foreign tubular column failure accidents occur at threaded connections, and the domestic failure accidents are as high as 86%.
At present, deep wells, ultra-deep wells, high-pressure wells, heavy oil thermal recovery wells, directional wells, horizontal wells, heavy corrosion wells and the like are developed globally, the underground working conditions are more and more complicated, and the traditional API threaded connector cannot meet the use requirements due to the defects of the API threaded connector: the inclination angle of the API thread shoulder is 90 degrees, after a certain Michler's chore is reached in the tightening process, the male and female threads are kept in completely tight combination, the shoulders are mutually extruded to certain contact stress to form sealing, and the taper deviation of the external thread is generally positive and the taper deviation of the internal thread is negative, so that the thread gnaws tightly in the front half part and loose in the rear half part after tightening, and the stress is very uneven. Furthermore, the symmetrical distribution of the thread forms also leads to poor stress of the thread teeth, so that the threads of the drilling tool are easy to generate fatigue to cause damage.
In addition, the side walls of the standard API threaded joint are all in an inclined plane shape, so that the standard API threaded joint is screwed tightly and is better and firmer, but the problem is solved, the thickness of the side walls of the joints is inconsistent, and if the strength of the whole joint is ensured, the thickness of the side wall at the thinner part of the joint cannot be too low, so that the thickness of the side wall at the thicker part of the joint is further increased, and in the field of drilling joints, the thickness of the joint is too thick, so that the installation space in the joint is greatly extruded, a plurality of internal parts cannot be normally installed, the design difficulty of a downhole tool is increased, and the performance parameters of the downhole tool are also influenced.
Disclosure of Invention
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a thread structure including:
a cylindrical member including a first section and a second section in a length direction, a periphery of the first section extending radially outward to form a projection of an annular cylinder,
the outer end face A1 of the protrusion is obliquely arranged at 60-80 degrees with the axis of the cylindrical member, the outer end face A2 of the cylindrical member is vertically arranged at 90 degrees with the axis 5 of the cylindrical member, the included angle between the outer end face A1 and the outer end face A2 is 60-80 degrees,
a thread helically extending along the second section in spaced apart thread turns.
According to a preferred embodiment of the present invention,
the second section comprises an M1 section and an M2 section, the M1 section is adjacent to the first section, the outer side face of the M1 section and the outer side end face A1 of the protrusion are obliquely arranged at an angle of 60-80 degrees, and the outer surface of the M2 section is provided with the threads along the length direction of the outer surface;
and the connection part of the outer side end surface A1 of the protrusion and the outer side surface of the M1 section is in arc transition.
According to a preferred embodiment of the present invention, the outer side surface of the segment M1 is inclined at 70 ° to the outer side end surface a1 of the protrusion.
According to a preferred embodiment of the invention, the thread is provided with a plurality of thread protrusions arranged at intervals, the cross section of each thread protrusion is square, a concave area is formed between every two adjacent thread protrusions,
the bottom of the recessed region is the thread root 401, the top die of the thread protrusion is the thread crown 402, one of the two sides of the recessed region is the stabbing flank 404, the other is the load flank 403,
the transition between the thread crest 402 and the stabbing flank 404 is beveled,
the transition between the thread crest 402 and the load flank 403 is bevelled,
the transition areas of the thread root, the stabbing side face and the bearing side face are circular arcs.
According to a preferred embodiment of the present invention,
the bevel angle of the transition between the thread crest 402 and the stabbing flank 404 is 45,
the bevel angle of the transition area between the thread crest 402 and the load flank 403 is 45 °.
According to a preferred embodiment of the present invention,
the thread crests 402 and thread roots 401 are parallel to the axis 5 of the cylindrical member.
According to a preferred embodiment of the invention, the height of the thread protrusion is equal to the height difference H between the thread crest 402 and the thread root 401, which satisfies the following:
wherein the TPI is the number of threads per inch of the thread in units of 1/inch, the value of TPI is 3-5, and the unit of H is in inches.
Yet another preferred embodiment of the present invention provides a threaded joint system, comprising a pin and a box,
wherein the male connector adopts the thread structure of any one of claims 1 to 7,
a screw hole is formed in the female joint, one end of the screw hole is opened for the male joint to be inserted, the end surface B of the female joint, which is opened for the male joint to be inserted, is inclined, and the inclination angle of the end surface B is matched with the angle shape of the joint of the outer side end surface A1 of the protrusion and the outer side surface of the M1 section;
the screw hole of the female joint is internally provided with an internal thread which is matched with the external thread on the male joint.
According to a preferred embodiment of the present invention,
after the male connector is inserted into the female connector, the outer peripheral side surfaces of the male connector and the female connector are in planar connection.
According to a preferred embodiment of the present invention,
the female joint is of a cylindrical structure.
The invention at least comprises the following beneficial effects:
(1) the threaded joint has good self-locking performance, the internal and external threads are not easy to generate relative axial movement, the male joint and the female joint cannot generate relative movement, and the petroleum drill rod joint can relieve strain caused by stress and relieve scratches, bending and breakage caused by stress concentration to the thread shoulder of the joint and the thread surface under the action of torque and pressure;
(2) the anti-torque effect is high, the operation safety of the drill rod joint can be enhanced, the service life of the drill rod joint is prolonged, the strength effect of the drill rod is improved, and the anti-torque drill rod joint is economical and practical;
(3) the occupied space of the joint is small, a larger drift diameter is provided, the requirements on the sizes of other parts are lower, and the overall performance of the tool is improved;
(4) and by adopting a balance algorithm, the extrusion strength and the shearing strength of the joint can be ensured to be basically equal, and the consistency is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the thread structure of the present invention;
fig. 2 is a partial schematic view at K in fig. 1.
FIG. 3 is a schematic view of the structure of the female connector of the present invention.
Fig. 4 is a schematic view of the structure of the threaded joint system of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Aiming at a series of problems existing in the condition that the side walls of a standard API threaded joint are all in the shape of an inclined plane, the application develops a novel thread structure, as shown in figure 1, the thread structure comprises:
a cylindrical member 1 including a first section 101 and a second section 102 in a length direction, a periphery of the first section 101 extending radially outward to form a projection 2 of an annular cylinder,
the outer end face A1 of the protrusion 2 is obliquely arranged at an angle of 60-80 degrees with the axis of the cylindrical member, the outer end face A2 of the cylindrical member 1 is vertically arranged at an angle of 90 degrees with the axis 5 of the cylindrical member 1, the included angle between the outer end face A1 and the outer end face A2 is 60-80 degrees,
a thread 3 helically extending along said second section 102 in spaced apart thread turns.
In the above embodiment, the cylindrical member 1 is adopted, the outer side wall of the cylindrical member is linear, that is, the thickness of the side wall of the cylindrical member is uniform, the strength of the whole thread structure can be ensured to be consistent, the problem that the thickness of the side wall of the whole joint is required to be thickened due to too low strength of a thin wall caused by inconsistent thickness is not required to be considered, and the cylindrical member 1 is hollow so as to facilitate the placement and installation of internal parts during installation and use.
Considering that, if only the cylindrical member 1 with the same thickness is used, another problem occurs, that is, the self-locking function cannot be realized after the joint is screwed, and looseness easily occurs, so the present application also improves that the outer side end face a1 of the protrusion 2 is obliquely arranged at 60-80 ° with the axis of the cylindrical member, the outer side end face a2 of the cylindrical member 1 is vertically arranged at 90 ° with the axis 5 of the cylindrical member 1, and the included angle between the outer side end face a1 and the outer side end face a2 is 60-80 °, so that after the joint is screwed, the self-locking function can be realized due to the inclined angle.
Compared with the API standard drill rod thread, the thread structure adopts the cylindrical thread, the thread taper is cancelled, in order to improve the thread self-locking performance, the adopted scheme is that the shoulder angle is properly reduced, when the shoulder is contacted, not only is axial pressure generated, but also a radial component is generated, the thread self-locking performance can be better improved, and the effect of tightening the shoulder is achieved, at the moment, the shoulder angle is critical, when the shoulder angle is too low, the effective wall thickness of the shoulder is insufficient, the anti-extrusion capacity of the shoulder is reduced, when the shoulder angle is too high, the self-locking performance of the shoulder is insufficient, through long-term field application, the 60-80-degree included angle is found to meet the strength requirement and also meet the self-locking performance requirement, and the shoulder specifically refers to an outer end surface A1 of the bulge 2 and an outer end surface A2 of the cylindrical component 1.
In another embodiment, the second segment 102 comprises an M1 segment 121 and an M2 segment 122, the M1 segment 121 is adjacent to the first segment 101, the outer side surface of the M1 segment 121 is inclined at 60-80 ° to the outer side end surface a1 of the protrusion 2, and the outer surface of the M2 segment 122 is provided with the thread 3 along the length direction thereof;
and the connection between the outer side end face A1 of the protrusion 2 and the outer side face of the M1 section 121 is in arc transition, the thread root region is the most prominent place for stress concentration, the transition region between the thread root of the male thread and the bearing side face has the largest stress from the stress distribution curve of the thread, in the use process of the thread, the periodic load applied on the thread determines that cracks are generated and spread from the thread root, the fatigue result is that the male thread is broken, and the arc transition has a better effect of reducing the stress concentration.
Common threads or short-toothed trapezoidal threads have the problem of poor thread fatigue resistance, the problem of poor anti-loosening effect of the existing single-head threads also exists, the thickness of the threads is large, namely the thread part occupies a considerable pipe wall thickness, and the design space of other parts is extruded.
Due to the inconsistent thickness of conventional thread configurations, the threads may have an excessive radial height (i.e., the threads may be too "tall"), thus resulting in a reduction in the critical cross-sectional area of the threaded connection (as the threads are cut radially deeper into the pin member and the box member), which results in a reduction in the overall torsional strength of the formed connection. Alternatively, if the threaded connection is over designed in terms of shear strength, the threads may be too long along the connection centerline (e.g., axial length), thus reducing the available contact area at the inboard shoulder, which also results in a reduction in the overall torsional strength of the resulting connection, and thus the present application designs a new type of thread, specifically:
the thread 3 is provided with a plurality of thread protrusions arranged at intervals, the cross sections of the thread protrusions are square, a concave area is formed between every two adjacent thread protrusions, the bottom of the concave area is a thread root 401, the top die of each thread protrusion is a thread crown 402, one of two side edges of the concave area is a buckle side 404, the other side edge of the concave area is a bearing side 403, the oblique angle of the transition area between the thread crown 402 and the buckle side 404 is 45 degrees,
the bevel angle of the transition area between the thread crest 402 and the load flank 403 is 45 °.
Wherein the height of the thread protrusion is equal to the height difference H between the thread crest 402 and the thread root 401, which satisfies the following:
wherein the TPI is the number of threads per inch of the thread in units of 1/inch, the value of TPI is 3-5, and the unit of H is in inches.
In another embodiment, the thread crest 402 and the thread root 401 are both parallel to the axis 5 of the cylindrical member, and the thread root, the thread crest, the stabbing flank and the bearing flank form a square region, so that the square thread can utilize the effective height of the thread to the maximum extent, thereby improving the anti-extrusion strength of the thread and improving the self-locking performance of the thread.
Another preferred embodiment of the present invention also provides a threaded joint system comprising a pin 1P and a box 2P,
wherein the male connector adopts the thread structure of any one of claims 1 to 7,
a screw hole 6 is arranged in the female joint 2P, one end of the screw hole is open for the male joint 1P to insert, the end surface B of the open end of the female joint for the male joint 1P to insert is inclined, and the inclination angle of the end surface B is matched with the angle shape of the connection part of the outer side end surface A1 of the protrusion 2 and the outer side surface of the M1 section;
the female connector 2P has an internal thread 7 in the threaded hole, which is adapted to the external thread (i.e., the thread 3) of the male connector 1P.
According to a preferred embodiment of the present invention,
after the male connector 1P is inserted into the female connector 2P, the outer peripheral surfaces of the two are connected in a planar manner.
According to a preferred embodiment of the present invention,
the female connector 2P has a cylindrical structure.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A thread form, comprising:
a cylindrical member including a first section and a second section in a length direction, a periphery of the first section extending radially outward to form a projection of an annular cylinder,
the outer end face A1 of the protrusion is obliquely arranged at an angle of 60-80 degrees with the axis of the cylindrical member, the outer end face A2 of the cylindrical member is vertically arranged at an angle of 90 degrees with the axis of the cylindrical member, the included angle between the outer end face A1 and the outer end face A2 is 60-80 degrees,
a thread helically extending along the second section in spaced apart thread turns.
2. The thread form of claim 1,
the second section comprises an M1 section and an M2 section, the M1 section is adjacent to the first section, the outer side face of the M1 section and the outer side end face A1 of the protrusion are obliquely arranged at an angle of 60-80 degrees, and the outer surface of the M2 section is provided with the threads along the length direction of the outer surface;
and the connection part of the outer side end surface A1 of the protrusion and the outer side surface of the M1 section is in arc transition.
3. The thread form of claim 2,
the outer side face of the M1 section and the outer side end face A1 of the protrusion are arranged in an inclined mode at 70 degrees.
4. The thread form of claim 2,
the thread is provided with a plurality of thread bulges arranged at intervals, the cross sections of the thread bulges are square, a concave area is formed between every two adjacent thread bulges,
the bottom of the depressed area is a thread root, the top die of the thread bulge is a thread crown, one of the two sides of the depressed area is a buckle side, the other side is a bearing side,
the transition area between the thread crest and the stabbing flank is bevelled,
the transition region between the thread crest and the load flank is beveled.
5. The thread form of claim 4,
the bevel angle of the transition between the thread crest and the stabbing flank is 45,
the angle of the bevel of the transition between the thread crest and the load flank is 45,
the transition areas of the thread root, the stabbing side face and the bearing side face are circular arcs.
6. The thread form of claim 5,
the thread crest and the thread root are each parallel to an axis of the cylindrical member.
7. The thread form of claim 5,
the height of the thread projection is equal to the height difference H between the thread crest and the thread root, which satisfies the following:
wherein the TPI is the number of threads per inch of the thread in units of 1/inch, the value of TPI is 3-5, and the unit of H is in inches.
8. A threaded joint system, comprising a male joint and a female joint,
wherein the male connector adopts the thread structure of any one of claims 1 to 7,
a screw hole is formed in the female joint, one end of the screw hole is opened for the male joint to be inserted, the end surface B of the female joint, which is opened for the male joint to be inserted, is inclined, and the inclination angle of the end surface B is matched with the angle shape of the joint of the outer side end surface A1 of the protrusion and the outer side surface of the M1 section;
the screw hole of the female joint is internally provided with an internal thread which is matched with the external thread on the male joint.
9. The threaded joint system of claim 8,
after the male connector is inserted into the female connector, the outer peripheral side surfaces of the male connector and the female connector are in planar connection.
10. The threaded joint system of claim 8,
the female joint is of a cylindrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110711617.4A CN113431506B (en) | 2021-06-25 | 2021-06-25 | Thread structure and threaded joint system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110711617.4A CN113431506B (en) | 2021-06-25 | 2021-06-25 | Thread structure and threaded joint system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113431506A true CN113431506A (en) | 2021-09-24 |
| CN113431506B CN113431506B (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110711617.4A Active CN113431506B (en) | 2021-06-25 | 2021-06-25 | Thread structure and threaded joint system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113431506B (en) |
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| US4373754A (en) * | 1978-08-09 | 1983-02-15 | Hydril Company | Threaded connector |
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| CN105604499A (en) * | 2014-11-19 | 2016-05-25 | 宝山钢铁股份有限公司 | A direct connection type double-step threaded joint |
| US20170059063A1 (en) * | 2015-08-27 | 2017-03-02 | Diversity Technologies Corporation | Threaded Joint |
| CN208137877U (en) * | 2018-03-15 | 2018-11-23 | 海隆石油钻具（无锡）有限公司 | A kind of rotation screw thread joint of petroleum drill rod with high torque resistant |
| US20190271418A1 (en) * | 2018-03-01 | 2019-09-05 | Mitchell Z. Dziekonski | Thread form and threaded article |
| CN209942756U (en) * | 2018-08-17 | 2020-01-14 | 达力普石油专用管有限公司 | Simple anti-over-torsion air-tight seal threaded joint |
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| CN211974902U (en) * | 2020-01-19 | 2020-11-20 | 中国地质科学院勘探技术研究所 | Multi-shoulder drill rod joint |
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2021
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| US20020074799A1 (en) * | 1999-10-20 | 2002-06-20 | Watts John D. | Open type wedgethread connection |
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| US20170059063A1 (en) * | 2015-08-27 | 2017-03-02 | Diversity Technologies Corporation | Threaded Joint |
| US20190271418A1 (en) * | 2018-03-01 | 2019-09-05 | Mitchell Z. Dziekonski | Thread form and threaded article |
| CN208137877U (en) * | 2018-03-15 | 2018-11-23 | 海隆石油钻具（无锡）有限公司 | A kind of rotation screw thread joint of petroleum drill rod with high torque resistant |
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| 焦文鸿;高连新;鲁喜宁;: "一种新型钻杆螺纹设计及应力分析", 石油机械, no. 06, pages 17 - 21 * |
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| Publication number | Publication date |
|---|---|
| CN113431506B (en) | 2023-09-15 |
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