CN211974902U - Multi-shoulder drill rod joint - Google Patents
Multi-shoulder drill rod joint Download PDFInfo
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- CN211974902U CN211974902U CN202020124544.XU CN202020124544U CN211974902U CN 211974902 U CN211974902 U CN 211974902U CN 202020124544 U CN202020124544 U CN 202020124544U CN 211974902 U CN211974902 U CN 211974902U
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Abstract
A multi-shoulder drill rod joint comprises a male joint and a female joint, wherein an outer pipe section is arranged on the outer side of the thread of the male joint, an annular groove is formed between the outer pipe section and the thread section of the male joint, the female joint is provided with an insertion section, the insertion section is inserted into the annular groove of the male joint in a matched manner, the end head of the outer pipe section is a male joint main shoulder, the bottom surface of the annular groove is a male joint main shoulder and a male joint auxiliary shoulder, and the small end of the male joint is a male joint auxiliary shoulder; the bottom surface of the insertion section of the female joint is a female joint main shoulder, the large end of the female joint is a female joint main and auxiliary shoulder, and the bottom surface of the small end of the female joint thread is a female joint auxiliary shoulder; the male joint main shoulder and the female joint main shoulder form a main sealing surface, the male joint main shoulder and the female joint auxiliary shoulder form a main sealing surface and an auxiliary sealing surface, and the male joint auxiliary shoulder and the female joint auxiliary shoulder form an auxiliary sealing surface. The utility model can obviously improve the sealing performance of the joint and relieve the problem of stress concentration of the thread of the conventional structure; the thread stress is relatively uniformly distributed, and the large bending deformation and torsion deformation resistance of the drill rod is improved.
Description
Technical Field
The utility model relates to a device for well drilling, especially many shoulders tool joint.
Background
The drill pipe is used as a link for communicating the earth surface to the well bottom in the drilling process and plays roles in slurry conveying, torque transmission and sealing gasket. The stress state of the drill rod is complex, and the failure of the drill rod becomes one of the main accidents in the well, particularly the failure of the drill rod is the main part of the failure of the drill rod. With the rise of ultra-deep scientific drilling and deep-sea scientific drilling in recent years, high-temperature, high-pressure, high-stress and non-riser limit working conditions have higher requirements on the performance of a drill rod, the conventional drill rod cannot meet the requirements of severe working condition conditions, the accidents of expansion buckle of a joint female buckle, sealing failure of a shoulder, thread cross buckle, root fracture and the like frequently occur, and particularly the joint sealing performance of the drill rod working under the working conditions of high pressure and large bending moment (without the riser) becomes the bottleneck limiting the improvement of the performance of the drill rod. In addition, the improvement of the mechanical properties of the joint, such as torsion resistance, bending resistance, etc., is also an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sealed effectual, antitorque and many shoulders drilling rod joint that bending resistance mechanical properties is high.
The problem of the utility model is realized with following technical scheme:
a multi-shoulder drill rod joint comprises a male joint and a female joint which are connected through taper pipe threads, wherein an outer pipe section is arranged on the outer side of the taper pipe threads of the male joint, an annular groove is formed between the outer pipe section and the taper pipe thread sections of the male joint, the female joint is provided with an insertion section, the insertion section is inserted into the annular groove of the male joint in a matched mode, the end of the outer pipe section of the male joint is a male joint main shoulder, the bottom surface of the annular groove of the male joint is a male joint main and auxiliary shoulders, and the small end of the taper pipe threads of the male joint is a male joint; the bottom surface of the insertion section of the female joint is a female joint main shoulder, the large end of the female joint taper pipe thread is a female joint main shoulder and a female joint auxiliary shoulder, and the bottom surface of the small end of the female joint taper pipe thread is a female joint auxiliary shoulder; in the joint connection state, the main shoulder of the male joint and the main shoulder of the female joint are tightly attached to form a main sealing surface, the main shoulder and the auxiliary shoulder of the male joint and the main shoulder and the auxiliary shoulder of the female joint are tightly attached to form a main sealing surface and an auxiliary sealing surface, and the auxiliary shoulder of the male joint and the auxiliary shoulder of the female joint are tightly attached to form an auxiliary sealing surface.
Above-mentioned many circular bead drill rod joint, male joint and the drill rod body of rod structure as an organic whole, annular slot is by the middle part of male joint taper pipe screw thread section to the bottom of male joint taper pipe screw thread section, and female joint and drill rod body of rod structure as an organic whole structure, insert the section by the middle part of female joint taper pipe screw thread section to female joint taper pipe screw thread section.
The multi-shoulder drill rod joint has the advantages that the axial length of the annular structure is L1, the axial length of the insertion section is L2, L1 is larger than L2, S1 is L1-L2, the axial length from the main shoulder of the male joint to the small end of the male joint is L3, the axial length from the auxiliary shoulder of the female joint to the large end of the female joint is L4, L3 is larger than L4, S2 is L3-L4, and S1 is smaller than S2.
In the multi-shoulder drill rod joint, the male joint main shoulder and the female joint main shoulder are respectively provided with spiral line convex grooves which can be screwed mutually, and the spiral line convex grooves of the male joint main shoulder and the spiral line convex grooves (2-5) of the female joint main shoulder are meshed mutually to form interference fit connection.
In the multi-shoulder drill rod joint, the inner wall of the annular groove of the male joint is tightly attached to the outer wall of the insertion section of the female joint.
Above-mentioned many shoulders drill pipe joint, the protruding slot of male joint helical line is the same with the protruding slot's of male joint helical line initial phase angle, and the terminal phase angle of the protruding slot of the main shoulder helical line of male-female joint is compared the terminal phase angle extension theta angle of the protruding slot of the main shoulder helical line of female joint, and theta equals 30 ~ 45.
The utility model discloses to leakproofness and the anti-torque bending resistance under improvement tool joint high pressure and the big moment of flexure operating mode, break through traditional tool joint's design, a new method is sought, has designed a tool joint who has the sealed face of three circular bead. The three-order shoulder sealing surface design is combined with the axial sealing surface, so that the sealing performance of the joint can be obviously improved, the high-pressure-resistant sealing capability of the drill rod under the limit working condition is improved, and the problem of thread stress concentration of the conventional structure is solved; the utility model provides radial pretightening force through the design of the spiral tooth meshing connection of the sealing surface of the main shoulder, realizes the relatively uniform distribution of thread stress, and improves the large bending deformation and torsion deformation resistance of the drill rod; in addition, the whole structure of the drill rod body and the joint reduces the stress weak point of the drill rod string. The utility model discloses a design can generally be used for the metal drill rod, especially to the titanium alloy drill rod that elastic modulus is less relatively, but the emergence probability of bad phenomena such as the thread rise of greatly reduced is detained, is detained by mistake, sealed inefficacy, reaches the root fracture.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of a male connector;
FIG. 3 is an enlarged view of a portion of FIG. 1 at A;
FIG. 4 is a schematic structural view of a female connector;
FIG. 5 is an enlarged partial view at B in FIG. 4;
FIG. 6 is a schematic view of the distribution of helical raised grooves in the main shoulder of the male connector;
fig. 7 is a schematic diagram of the distribution of spiral line raised grooves of the main shoulder of the female joint.
The reference numbers in the figures are: 1. a male connector; 1-1 parts of annular grooves, 1-2 parts of male joint main shoulders, 1-3 parts of male joint main and auxiliary shoulders, 1-4 parts of male joint auxiliary shoulders, 1-5 parts of male joint main shoulder spiral line bulge grooves, 2 parts of female joint, 2-1 parts of insertion sections, 2-2 parts of female joint main shoulders, 2-3 parts of female joint main and auxiliary shoulders, 2-4 parts of female joint auxiliary shoulders, 2-5 parts of male joint main shoulder spiral line bulge grooves, 3 parts of drill rod bodies, 4 parts of main sealing surfaces, 5 parts of main sealing surfaces, 6 parts of auxiliary sealing surfaces, 7 parts of axial sealing sections.
Detailed Description
Referring to fig. 1, 2 and 4, the utility model discloses a taper pipe threaded connection's male joint 1 and female joint 2, the drilling rod body of rod 3 structure as an organic whole that the male joint is connected rather than, the drilling rod body of rod 3 structure as an organic whole that the female joint is connected rather than, can reduce the weak point of drilling string like this, has improved the whole security of drilling string. An outer pipe section is arranged on the outer side of the male joint taper pipe thread section, and an annular groove 1-1 is formed between the outer pipe section and the male joint taper pipe thread section. The annular groove is formed from the middle part of the threaded section of the taper pipe of the male joint to the bottom of the threaded section of the taper pipe of the male joint. The female joint is provided with an insertion section 2-1, the insertion section extends from the large end of the taper pipe thread of the female joint to the middle part of the taper pipe thread section of the female joint, and the insertion section is inserted into the annular groove of the male joint in a matching mode. The end of the outer pipe section of the male joint is a male joint main shoulder 1-2, the bottom surface of the annular groove of the male joint is a male joint main shoulder 1-3, and the small end of the taper pipe thread of the male joint is a male joint auxiliary shoulder 1-4. The bottom surface of the insertion section of the female joint is a female joint main shoulder 2-2, the large end of the female joint taper pipe thread is a female joint main shoulder 2-3, and the bottom surface of the small end of the female joint taper pipe thread is a female joint auxiliary shoulder 2-4. The three shoulders are respectively arranged on the male joint and the female joint, in a joint connection state, the main shoulder of the male joint is tightly attached to the main shoulder of the female joint to form a main sealing surface 4, the main and auxiliary shoulders of the male joint are tightly attached to the main and auxiliary shoulders of the female joint to form a main and auxiliary sealing surface 5, and the auxiliary shoulder of the male joint is tightly attached to the auxiliary shoulder of the female joint to form an auxiliary sealing surface 6. The three-step sealing structure with the unique design has the advantages that the three shoulder surfaces are sealed, so that the sealing performance is greatly improved, and the sealing requirement under the high-pressure working condition is met. The contact position of the main shoulder is moved to the corresponding position in the middle of the thread, the axial length of the main shoulder of the male connector is prolonged, the shaft surfaces of the shoulders of the male connector and the female connector are matched and inserted with each other before the threads of the male connector and the female connector are screwed in, the coaxiality of the male connector and the female connector is ensured, the threads are screwed in more smoothly, and the wrong buckling and biting damage caused by misalignment between the threads in the screwing-in process is avoided. Meanwhile, the design of multiple shoulders relieves the problem of concentrated stress distribution of the threads, so that the stress distribution of the threads is more uniform, and the torsion and bending resistance is stronger. In the process of screwing the male thread into the female thread, the three shoulders are contacted in sequence according to the main shoulder, the auxiliary shoulder and the auxiliary shoulder. In the process of screwing the male joint and the female joint, the main shoulders are firstly contacted; continuing to screw the male joint and the female joint, and before the main shoulder and the auxiliary shoulder are contacted, because the main shoulder is limited, the thread stress shows a distribution rule that the middle is large and the two ends are small along the axial direction; the main shoulder and the auxiliary shoulder are contacted with each other along with the continuous screwing-in, and before the auxiliary shoulder is contacted, the thread stress caused by the limit of the main shoulder and the auxiliary shoulder is distributed regularly in a left-large and right-small mode along the axial direction; and finally, the auxiliary shoulder is continuously screwed into a certain angle after being contacted, and the thread stress caused by the limit of the auxiliary shoulder is distributed in a right-large and left-small distribution rule along the axial direction. The problem of thread stress concentration of a conventional structure can be relieved after three parts of thread stress are superposed. The axial length of the annular groove is L1, the axial length of the insertion section is L2, L1 is larger than L2, the axial length from the male joint main shoulder to the male joint auxiliary shoulder is L3, the axial length from the female joint auxiliary shoulder to the female joint main shoulder is L4, L3 is larger than L4, S1 is L1-L2, S2 is L3-L4, and S1 is smaller than S2, so that the contact sequence of the main shoulder, the main shoulder and the auxiliary shoulder is ensured.
Referring to fig. 1, the inner wall of the annular groove of the male connector is tightly attached to the outer wall of the insertion section of the female connector to form a sealing surface, so that an axial sealing section 7 is added on the basis of three-shoulder sealing to ensure the compactness of connection. On one hand, the axial sealing section improves the sealing performance of the joint, and the smaller the gap is, the longer the path is, and the larger the resistance of the sealing channel is; on the other hand, under the working condition that the joint is subjected to bending moment, the bending resistance is improved, and the influence on the threads is reduced.
Referring to fig. 2-5, helical line convex grooves which can be screwed mutually are respectively arranged on the male connector main shoulder and the female connector main shoulder, and the helical line convex grooves 1-5 of the male connector main shoulder and the helical line convex grooves 2-5 of the female connector main shoulder are meshed mutually to form interference fit connection. The spiral line convex grooves with the triangular teeth are arranged on the main shoulder surface, when the main shoulder of the male joint is in contact with the main shoulder surface of the main shoulder of the female joint, the spiral line convex grooves are mutually screwed to generate force which is folded towards the center, namely, certain radial pretightening force is provided for the threaded connection of the taper pipe, the torsion resistance and the bending resistance of the main shoulder are increased, and the capability of the drill rod for dealing with large bending moment deformation and large torque output working conditions is improved.
Referring to fig. 6 and 7, in order to ensure that no interference occurs during the continuous screwing-in process of the pre-tightening, the initial phase angles of the convex grooves of the male connector helical line and the convex grooves of the male connector helical line are the same, and the termination phase angle of the convex grooves of the main shoulder helical line of the male connector and the termination phase angle of the convex grooves of the main shoulder helical line of the female connector extend by an angle theta which is 30-45 degrees.
Claims (6)
1. The utility model provides a many shoulders tool joint, includes taper pipe threaded connection's male joint (1) and female joint (2), its characterized in that: an outer pipe section is arranged on the outer side of the taper pipe thread of the male joint, an annular groove (1-1) is formed between the outer pipe section and the taper pipe thread section of the male joint, the female joint is provided with an insertion section (2-1), the insertion section is inserted into the annular groove of the male joint in a matching manner, the end head of the outer pipe section of the male joint is a male joint main shoulder (1-2), the bottom surface of the annular groove of the male joint is a male joint main shoulder (1-3), and the small end of the taper pipe thread of the male joint is a male joint auxiliary shoulder (1-4); the bottom surface of the insertion section of the female joint is a female joint main shoulder (2-2), the large end of the female joint taper pipe thread is a female joint main shoulder (2-3), and the bottom surface of the small end of the female joint taper pipe thread is a female joint auxiliary shoulder (2-4); in the joint connection state, the main shoulder of the male joint and the main shoulder of the female joint are tightly attached to form a main sealing surface (4), the main shoulder and the auxiliary shoulder of the male joint and the main shoulder and the auxiliary shoulder of the female joint are tightly attached to form a main sealing surface (5), and the auxiliary shoulder of the male joint and the auxiliary shoulder of the female joint are tightly attached to form an auxiliary sealing surface (6).
2. The multi-shoulder drill pipe joint as recited in claim 1, wherein: the male joint and the drill rod body (3) are of an integrated structure, the annular groove is formed from the middle of the male joint taper pipe thread section to the bottom of the male joint taper pipe thread section, the female joint and the drill rod body are of an integrated structure, and the insertion section is formed from the large end of the female joint taper pipe thread section to the middle of the female joint taper pipe thread section.
3. The multi-shoulder drill pipe joint as recited in claim 2, wherein: the axial length of the annular structure is L1, the axial length of the insertion section is L2, L1 is greater than L2, S1 is L1-L2, the axial length from the main shoulder of the male connector to the small end of the male connector is L3, the axial length from the auxiliary shoulder of the female connector to the large end of the female connector is L4, L3 is greater than L4, S2 is L3-L4, and S1 is less than S2.
4. The multi-shoulder drill pipe joint of claim 3, wherein: spiral line convex grooves which can be mutually screwed are respectively arranged on the male connector main shoulder and the female connector main shoulder, and the spiral line convex grooves (1-5) of the male connector main shoulder and the spiral line convex grooves (2-5) of the female connector main shoulder are mutually meshed to form interference fit connection.
5. The multi-shoulder drill pipe joint of claim 4, wherein: the inner wall of the annular groove of the male connector is tightly attached to the outer wall of the insertion section of the female connector.
6. The multi-shoulder drill pipe joint of claim 5, wherein: the initial phase angle of the convex grooves of the male connector spiral line is the same as that of the convex grooves of the male connector spiral line, the termination phase angle of the convex grooves of the main shoulder spiral line of the male connector and the female connector is extended by an angle theta compared with that of the convex grooves of the main shoulder spiral line of the female connector, and the angle theta is 30-45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020124544.XU CN211974902U (en) | 2020-01-19 | 2020-01-19 | Multi-shoulder drill rod joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020124544.XU CN211974902U (en) | 2020-01-19 | 2020-01-19 | Multi-shoulder drill rod joint |
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| Publication Number | Publication Date |
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| CN211974902U true CN211974902U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020124544.XU Active CN211974902U (en) | 2020-01-19 | 2020-01-19 | Multi-shoulder drill rod joint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271003A (en) * | 2020-01-19 | 2020-06-12 | 中国地质科学院勘探技术研究所 | Direct-connection drill rod for extreme working conditions |
| CN113431506A (en) * | 2021-06-25 | 2021-09-24 | 中石化石油机械股份有限公司研究院 | Thread structure and screwed joint system |
-
2020
- 2020-01-19 CN CN202020124544.XU patent/CN211974902U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271003A (en) * | 2020-01-19 | 2020-06-12 | 中国地质科学院勘探技术研究所 | Direct-connection drill rod for extreme working conditions |
| CN111271003B (en) * | 2020-01-19 | 2024-08-20 | 中国地质科学院勘探技术研究所 | A directly allies oneself with drilling rod for limit condition |
| CN113431506A (en) * | 2021-06-25 | 2021-09-24 | 中石化石油机械股份有限公司研究院 | Thread structure and screwed joint system |
| CN113431506B (en) * | 2021-06-25 | 2023-09-15 | 中石化石油机械股份有限公司研究院 | Thread structure and threaded joint system |
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