CN218542181U - Oil casing screwed joint structure - Google Patents
Oil casing screwed joint structure Download PDFInfo
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- CN218542181U CN218542181U CN202222367692.6U CN202222367692U CN218542181U CN 218542181 U CN218542181 U CN 218542181U CN 202222367692 U CN202222367692 U CN 202222367692U CN 218542181 U CN218542181 U CN 218542181U
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Abstract
The utility model discloses an oil casing screwed joint structure, including the joint Assembly, the joint Assembly includes: a female fitting and a male fitting; the female joint is provided with an internal thread section, a female sealing section and an anti-torsion end face shoulder which are sequentially arranged, the female sealing section is provided with a sealing part, and the sealing part comprises a first sealing part, a second sealing part, a third sealing part and a fourth sealing part which are sequentially connected; the male joint is provided with an external thread section, a male sealing section and an anti-torsion end surface shoulder which are arranged in sequence, and the male sealing section is provided with a matching sealing part; after the male joint and the female joint are screwed in place, the internal thread section and the external thread section are meshed and connected, the sealing part is in butt fit with the matched sealing part, and the anti-torsion end face shoulder is in butt fit with the anti-torsion end face shoulder; it can reach the resistance to compression ability of body equal strength to improve its sealing capacity.
Description
Technical Field
The utility model relates to an oil casing screwed joint structure.
Background
At present, an oil casing pipe is an indispensable special pipe in the oil-gas drilling and production process, and a threaded joint oil-through casing pipe string bears the test of composite stress generated by stretching, compression, bending, internal pressure, external pressure, temperature and the like in an oil-gas well for a long time, so the sealing capacity of the threaded joint is very important. To improve the sealing performance, the contact pressure and the contact area should be as large as possible. Most of sealing structures of the existing threaded joints have single contact area and generate small contact pressure, so that the sealing performance is poor. For example, chinese patent publication No. CN 21088888837U discloses a threaded joint for oil casing, which includes a male end and a female end, the male end and the female end are connected by threads; the male end comprises an outer nose end, the outer nose end is arranged at the end part of the male end, the female end comprises an inner nose end, and the inner nose end is arranged at the inner side of the female end; wherein, outer nose and outer nose cooperation form joint nose structure, and joint nose structure includes notch portion to improve the sealed contact pressure distribution of joint nose structure. However, the metal contact surface of the seal portion is single, and the sealing performance cannot be improved satisfactorily.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art's defect, provide an oil casing screwed joint structure, it can reach the resistance to compression ability of body equal strength to improve its sealing capacity.
In order to solve the technical problem, the technical scheme of the utility model is that: an oil casing nipple design comprising a nipple assembly, the nipple assembly comprising:
the female joint is provided with an internal thread section, a female sealing section and an anti-torsion end face shoulder which are sequentially arranged, wherein the female sealing section is provided with a sealing part, and the sealing part comprises a first sealing part, a second sealing part, a third sealing part and a fourth sealing part which are sequentially connected;
the male joint is provided with an external thread section, a male sealing section and an anti-torsion end surface shoulder which are sequentially arranged, and the male sealing section is provided with a matching sealing part; wherein the content of the first and second substances,
when the male joint and the female joint are screwed in place, the internal thread section and the external thread section are meshed and connected, the sealing part is in butt fit with the matched sealing part, and the anti-torsion end surface shoulder is in butt fit with the anti-torsion end surface shoulder.
Furthermore, the first sealing portion, the second sealing portion, the third sealing portion and the fourth sealing portion are of linear structures which are sequentially connected or circular arc structures which are sequentially connected in a tangent mode on the longitudinal section of the joint assembly, and the matching sealing portion is of a conical structure.
Further, a concrete structure of sealing is provided, first sealing, second sealing, third sealing and fourth sealing are in for the linear type structure that links up in proper order on the longitudinal section of joint subassembly to contained angle a1 between respectively and the axial line of joint subassembly is 9.5 ° ± 30', contained angle a2 is 10 ° ± 30', contained angle a3 is 10 ° ± 30', contained angle a4 is 9.5 ° ± 30', the cooperation sealing is in on the longitudinal section of joint subassembly with contained angle a5 between the axial line of joint subassembly is 3.5 ° ± 30'.
Further, in order to improve the composite load resistance of the thread, the internal thread section and the external thread section are both buttress threads.
Further, the angle b1 between the anti-twist end land and the vertical line and the angle b2 between the anti-twist end land and the vertical line =15 ° ± 30'.
Further, the axial distance L between the tail buckle of the internal thread section and the anti-torsion end surface shoulder is 20 +/-5 mm.
Further, in order to enhance the sealing effect, the internal thread section and the external thread section are in meshed connection to form a radial interference fit.
Further, the female sealing section is also provided with a tail sealing part, and a slot part is formed between the tail sealing part and the anti-torsion end face shoulder;
the male sealing section is also provided with a tail matching sealing part in contact fit with the tail sealing part, and the tail matching sealing part is connected with the reverse anti-torsion end surface shoulder to form a fillet part;
when the male joint and the female joint are screwed in place, the round corner part and the notch part enclose a storage groove for storing thread grease.
Further, a concrete structure of the cutaway groove portion is provided, the cutaway groove portion includes a cutaway groove conical surface subsection and a fillet subsection, one end of the cutaway groove conical surface subsection is connected with the tail sealing portion, the other end of the cutaway groove conical surface subsection is connected with one end of the fillet subsection, and the other end of the fillet subsection is connected with an end portion of the anti-torsion end face shoulder.
Further, on a longitudinal section of the joint assembly, an included angle c2 between the tail seal portion and an axial line of the joint assembly is 20 ° ± 30';
the intersection angle c1 between the tail sealing part and the groove-lacking conical surface part is 165 +/-30';
the radius R1 of the fillet subsection is 0.4-0.6 mm;
the radius R2 of the fillet is 0.8-1.2mm.
By adopting the technical scheme, the utility model discloses beneficial effect once has:
1. the first sealing part, the second sealing part, the third sealing part and the fourth sealing part form multi-area contact with the matching sealing part, so that the joint can achieve the compression resistance of the pipe body with the same strength under the condition of achieving the final composite load, and the sealing capability is improved;
2. the internal thread section and the external thread section are meshed and connected to form a radial interference fit, and the sealing device still has reliable sealing capability even under the condition that the end face is over-twisted and bent;
3. the existence of reserve tank can be stored unnecessary screw thread fat, effectively alleviates the metal to the coating of metal contact position and suppresses the pressure condition.
Drawings
Fig. 1 is a schematic structural view of a threaded joint structure of an oil casing according to the present invention;
fig. 2 is a partially enlarged view of a portion a of fig. 1;
fig. 3 is a partially enlarged view of a portion B of fig. 1.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 1 to 3, in this embodiment, an oil casing thread joint structure includes a joint assembly including:
the female joint comprises a female joint 1, wherein the female joint 1 is provided with an internal thread section 3, a female sealing section and an anti-torsion end face shoulder 4 which are sequentially arranged, the female sealing section is provided with a sealing part, and the sealing part comprises a first sealing part 51, a second sealing part 52, a third sealing part 53 and a fourth sealing part 54 which are sequentially connected;
the male joint 2 is provided with an external thread section 6, a male sealing section and a reverse anti-torsion end surface shoulder 7 which are sequentially arranged, and the male sealing section is provided with a matching sealing part 81; wherein, the first and the second end of the pipe are connected with each other,
when the male joint 2 and the female joint 1 are screwed in place, the female thread section 3 and the male thread section 6 are engaged and connected, the seal portion is in abutting engagement with the mating seal portion 81, and the anti-twisting end face shoulder 4 is in abutting engagement with the anti-twisting end face shoulder 7.
As shown in fig. 1-2, in the present embodiment, the sealing portion may have the following structure including: the first sealing portion 51, the second sealing portion 52, the third sealing portion 53 and the fourth sealing portion 54 are linear structures which are sequentially connected on a longitudinal section of the joint assembly, the matching sealing portion 81 is a conical structure, and the first sealing portion 51, the second sealing portion 52, the third sealing portion 53 and the fourth sealing portion 54 can also be circular arc structures which are sequentially and tangentially connected.
As shown in fig. 1-2, specifically, the first sealing portion 51, the second sealing portion 52, the third sealing portion 53 and the fourth sealing portion 54 are sequentially connected in a straight line structure on a longitudinal section of the joint assembly, and respectively have an angle a1 of 9.5 ° ± 30', an angle a2 of 10 ° ± 30', an angle a3 of 10 ° ± 30', an angle a4 of 9.5 ° ± 30', and an angle a5 of 3.5 ° ± 30' between the mating sealing portion 81 and the axial line of the joint assembly on the longitudinal section of the joint assembly.
The first sealing portion 51, the second sealing portion 52, the third sealing portion 53 and the fourth sealing portion 54 are in multi-surface contact with the matching sealing portion 81, so that the contact area and the contact pressure of the sealing portions are effectively improved, and the sealing performance is well improved.
As shown in fig. 1, in the present embodiment, the internal thread section 3 and the external thread section 6 are buttress threads, which are superior in the ability of the connection thread to resist composite loads as compared with conventional threads.
In the present embodiment, the axial distance L from the tail of the internally threaded section 3 to the torque-resistant end shoulder 4 is 20 ± 5mm, as shown in fig. 1.
Specifically, as shown in fig. 1, the internal thread section 3 and the external thread section 6 are engaged to form a radial interference fit, and reliable sealing capability is still provided even under the condition that the end face is over-twisted.
As shown in fig. 1 and 3, in the present embodiment, the female seal section further has a tail seal portion 55, and a notch portion is formed between the tail seal portion 55 and the torque-resistant end face shoulder 4;
the male sealing section is also provided with a tail matching sealing part 82 in contact fit with the tail sealing part 55, and a fillet part 10 is formed between the tail matching sealing part 82 and the anti-torsion end face shoulder 7;
after the male connector 2 and the female connector 1 are screwed in place, the fillet part 10 and the notch part form a storage tank for storing thread grease, redundant thread grease can be stored in the storage tank, and the condition that the coating of a metal-to-metal contact part is suppressed is effectively relieved.
As shown in fig. 1 and 3, the notch portion may be configured to include: a slot taper subsection 91 and a fillet subsection 92, one end of the slot taper subsection 91 being connected to the tail seal 55, the other end of the slot taper subsection 91 being connected to one end of the fillet subsection 92, the other end of the fillet subsection 92 being connected to the end of the anti-torque end shoulder 4.
As shown in fig. 3, in the present embodiment, specifically, in a longitudinal section of the joint assembly, an angle c2 between the tail seal portion 55 and an axial line of the joint assembly is 20 ° ± 30';
the intersection angle c1 between the trailing seal 55 and the groove taper subsection 91 is 165 ° ± 30';
the radius R1 of the fillet subsection 92 is 0.4-0.6 mm;
the radius R2 of the fillet 10 is 0.8 to 1.2mm.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An oil casing nipple construction, comprising a nipple assembly, the nipple assembly comprising:
the female joint (1) is provided with an internal thread section (3), a female sealing section and an anti-torsion end face shoulder (4) which are sequentially arranged, the female sealing section is provided with a sealing part, and the sealing part comprises a first sealing part (51), a second sealing part (52), a third sealing part (53) and a fourth sealing part (54) which are sequentially connected;
the male joint (2) is provided with an external thread section (6), a male sealing section and a reverse anti-torsion end surface shoulder (7) which are arranged in sequence, and the male sealing section is provided with a matching sealing part (81); wherein the content of the first and second substances,
when the male connector (2) and the female connector (1) are screwed in place, the internal thread section (3) and the external thread section (6) are meshed and connected, the sealing part is in butt fit with the matching sealing part (81), and the anti-torsion end surface shoulder (4) is in butt fit with the anti-torsion end surface shoulder (7).
2. The oil casing thread joint structure according to claim 1,
the first sealing part (51), the second sealing part (52), the third sealing part (53) and the fourth sealing part (54) are of linear structures which are sequentially connected or circular arc structures which are sequentially and tangentially connected on the longitudinal section of the joint assembly, and the matching sealing part (81) is of a conical structure.
3. The oil casing thread joint structure according to claim 2,
first sealing (51), second sealing (52), third sealing (53) and fourth sealing (54) are in for the linear type structure that links up in proper order on the longitudinal section of joint subassembly to contained angle a1 between respectively and the axial line of joint subassembly is 9.5 ° ± 30', contained angle a2 is 10 ° ± 30', contained angle a3 is 10 ° ± 30', contained angle a4 is 9.5 ° ± 30', cooperation sealing (81) is in on the longitudinal section of joint subassembly with contained angle a5 between the axial line of joint subassembly is 3.5 ° ± 30'.
4. The oil casing thread joint structure according to claim 1,
the internal thread section (3) and the external thread section (6) are both buttress threads.
5. The oil casing thread joint structure according to claim 1,
the angle b1 between the anti-kink end face shoulder (4) and the vertical and the angle b2 between the anti-kink end face shoulder (7) and the vertical are =15 ° ± 30'.
6. The oil casing thread joint structure according to claim 1,
and the axial distance L between the tail buckle of the internal thread section (3) and the anti-torsion end surface shoulder (4) is 20 +/-5 mm.
7. The oil casing thread joint structure according to claim 1,
the internal thread section (3) and the external thread section (6) are meshed and connected to form radial interference fit.
8. The oil casing thread joint structure according to claim 1,
the female sealing section is also provided with a tail sealing part (55), and a groove lacking part is formed between the tail sealing part (55) and the anti-torsion end face shoulder (4);
the male sealing section is also provided with a tail matching sealing part (82) in contact fit with the tail sealing part (55), and a fillet part (10) is formed by connection between the tail matching sealing part (82) and the anti-torsion end face shoulder (7);
when the male connector (2) and the female connector (1) are screwed in place, the fillet part (10) and the notch part enclose a storage tank for storing thread grease.
9. The oil casing thread joint structure according to claim 8,
the notch portion comprises a notch conical surface subsection (91) and a fillet subsection (92), one end of the notch conical surface subsection (91) is connected with the tail sealing portion (55), the other end of the notch conical surface subsection (91) is connected with one end of the fillet subsection (92), and the other end of the fillet subsection (92) is connected with the end portion of the anti-torsion end face shoulder (4).
10. The oil casing thread joint structure according to claim 9,
in a longitudinal section of the joint assembly, the angle c2 between the tail seal (55) and the axial line of the joint assembly is 20 ° ± 30';
the intersection angle c1 between the tail seal portion (55) and the groove-lacking conical surface subsection (91) is 165 DEG + -30';
the radius R1 of the fillet subsection (92) is 0.4-0.6 mm;
the radius R2 of the fillet part (10) is 0.8 to 1.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222367692.6U CN218542181U (en) | 2022-09-06 | 2022-09-06 | Oil casing screwed joint structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222367692.6U CN218542181U (en) | 2022-09-06 | 2022-09-06 | Oil casing screwed joint structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218542181U true CN218542181U (en) | 2023-02-28 |
Family
ID=85273117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222367692.6U Active CN218542181U (en) | 2022-09-06 | 2022-09-06 | Oil casing screwed joint structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218542181U (en) |
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2022
- 2022-09-06 CN CN202222367692.6U patent/CN218542181U/en active Active
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