CN220081351U - Directly-connected oil casing threaded joint - Google Patents
Directly-connected oil casing threaded joint Download PDFInfo
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- CN220081351U CN220081351U CN202321710932.6U CN202321710932U CN220081351U CN 220081351 U CN220081351 U CN 220081351U CN 202321710932 U CN202321710932 U CN 202321710932U CN 220081351 U CN220081351 U CN 220081351U
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- 238000007789 sealing Methods 0.000 claims abstract description 152
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 34
- 230000007704 transition Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a direct-connection type oil casing threaded joint, and relates to the technical field of oil casings. The direct-connection type oil casing threaded joint comprises an external threaded joint and an internal threaded joint, wherein the external threaded joint and the internal threaded joint sequentially form an external shoulder sealing part, a threaded connection part, a main sealing part and an internal shoulder sealing part from outside to inside along the axial direction of the direct-connection type oil casing threaded joint; the outer wall of the external threaded joint is convexly provided with an annular reinforcing supporting table, the reinforcing supporting table is positioned between the threaded connection part and the inner shoulder sealing part, and the main sealing part comprises a first external sealing surface arranged on the reinforcing supporting table and a first internal sealing surface arranged on the internal threaded joint and in sealing fit with the first external sealing surface. The direct-connection type oil casing threaded joint has the advantages of good compression resistance and sealing performance, does not have the problem of small annular clearance or/and small oil casing drift diameter, and is wide in application range.
Description
Technical Field
The utility model relates to the technical field of oil casing, in particular to a direct-connection type oil casing threaded joint.
Background
The direct-connection type oil casing threaded joint comprises an external threaded joint and an internal threaded joint which are in threaded connection, and according to different compression resistance, the direct-connection type oil casing threaded joint is mainly divided into a common type and a compression resistance type, and the main determinants of the common type and the compression resistance type are the thickness of a sealing structure.
The existing compression-resistant type is to increase the sealing thickness by integrally increasing the outer diameter of the internal threaded joint or/and integrally reducing the inner diameter of the external threaded joint (i.e. increasing the wall thickness) on the basis of the common type, and the compression-resistant type has higher price than the common type because the additional production process is required to be increased by increasing the wall thickness; after the external diameter of the internal threaded joint is integrally increased or/and the internal diameter of the external threaded joint is integrally reduced, the existing compression-resistant shrinkage has the problem that an annular gap (a gap between an oil sleeve and a well bore) is reduced or/and the drift diameter of the oil sleeve is reduced, so that the application range is reduced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a brand-new compression-resistant direct-connection type oil casing threaded joint, which has the advantages of good compression resistance and sealing performance, does not have the problems of small annular clearance or/and small oil casing drift diameter, and has wide application range.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the direct-connection type oil casing threaded joint comprises an external threaded joint and an internal threaded joint, wherein the external threaded joint and the internal threaded joint sequentially form an external shoulder sealing part, a threaded connection part, a main sealing part and an internal shoulder sealing part from outside to inside along the axial direction of the direct-connection type oil casing threaded joint; the outer wall of the external threaded joint is convexly provided with an annular reinforcing supporting table, the reinforcing supporting table is positioned between the threaded connection part and the inner shoulder sealing part, and the main sealing part comprises a first external sealing surface arranged on the reinforcing supporting table and a first internal sealing surface arranged on the internal threaded joint and in sealing fit with the first external sealing surface.
The threaded connection part comprises an external thread structure arranged on the external thread connector and an internal thread structure arranged on the internal thread connector and in threaded connection with the external thread structure; the reinforcing support table is connected with the cutter lifting groove of the external thread structure, one end of the reinforcing support table, which is close to the cutter lifting groove, is high, and one end of the reinforcing support table, which is close to the inner shoulder sealing part, is low; the height of the thread of the external thread structure is H, the bottom of the cutter lifting groove is 0.05-0.5 mm lower than the root of the thread, and the higher end of the reinforced supporting table is 0.1-H higher than the bottom of the cutter lifting groove.
The included angle between the first outer sealing surface and the first inner sealing surface and the axial direction of the direct-connection type oil sleeve threaded joint is a, and a is more than or equal to 1 degree and less than or equal to 30 degrees.
The external thread structure and the internal thread structure are provided with conicity, the reinforcing support table is provided with a protection surface which is the same as the conicity of the external thread structure, the protection surface is positioned between the cutter lifting groove and the first external sealing surface, and the protection surface is in arc transitional connection with the first external sealing surface.
And the reinforcing support table is in chamfer transition connection with the knife lifting groove.
Wherein an inner shoulder is arranged on the inner wall of the internal threaded joint, and the end part of the external threaded joint and the inner shoulder form the inner shoulder sealing part; the end face of the external thread joint is a second external sealing face, the shoulder face of the internal shoulder is a second internal sealing face matched with the second external sealing face, the first external sealing face is in arc transition connection with the second external sealing face, and the first internal sealing face is in arc transition connection with the second internal sealing face.
And the included angle between the second outer sealing surface and the second inner sealing surface and the radial direction of the direct-connection type oil sleeve threaded joint is 0-20 degrees.
Wherein, an outer shoulder is arranged on the outer wall of the external threaded joint, and the end part of the internal threaded joint and the outer shoulder form the outer shoulder sealing part; the outer shoulder is provided with a third outer sealing surface and a fourth outer sealing surface which are arranged at an included angle, the end part of the internal thread joint is provided with a third inner sealing surface which is in sealing fit with the third outer sealing surface and a fourth inner sealing surface which is in sealing fit with the fourth outer sealing surface, and the third outer sealing surface and the third inner sealing surface are positioned on the inner sides of the fourth outer sealing surface and the fourth inner sealing surface.
And an included angle between the third outer sealing surface and the third inner sealing surface and the axial direction of the direct-connection type oil sleeve threaded joint is b, and b is more than or equal to 0 degree and less than or equal to 45 degrees.
And the included angle between the fourth outer sealing surface and the radial direction of the fourth inner sealing surface and the radial direction of the direct-connection type oil sleeve threaded joint is c, and c is more than or equal to 0 degree and less than or equal to 30 degrees.
By adopting the technical scheme, the utility model has the beneficial effects that:
the design method for improving the sealing thickness by integrally increasing the outer diameter of the internal threaded joint or/and integrally reducing the inner diameter of the external threaded joint is abandoned, the first external sealing surface of the main sealing part is arranged on the reinforcing supporting table by arranging the reinforcing supporting table on the part of the external threaded joint, so that the sealing thickness of the external threaded joint at the first external sealing surface is improved, the purposes of improving the compression resistance and the sealing effect of the whole direct-connection type oil sleeve threaded joint are achieved, the advantages of good compression resistance and sealing performance are achieved, the problem that the annular gap is reduced or/and the diameter of the oil sleeve is reduced is solved, the application range of the direct-connection type oil sleeve threaded joint is wider, and the use requirements of the direct-connection type oil sleeve threaded joint under different conditions are met.
Drawings
FIG. 1 is a partial cross-sectional view of a straight-on oil casing threaded joint of the present utility model;
FIG. 2 is a split view of FIG. 1;
fig. 3 is an enlarged view of a portion a in fig. 2;
fig. 4 is an enlarged view of a portion B in fig. 2;
in the figure: 100. an external threaded joint; 10. reinforcing a supporting table; 101. a first outer sealing surface; 102. a second outer sealing surface; 103. a protective surface; 11. an external thread structure; 111. a knife lifting groove; 112. screw threads; 113. chamfering; 12. an outer shoulder; 121. a third outer sealing surface; 122. a fourth outer sealing surface; 200. an internally threaded joint; 20. an inner shoulder; 201. a first inner sealing surface; 202. a second inner sealing surface; 21. an internal thread structure; 221. a third inner sealing surface; 222. a fourth inner sealing surface; C. an outer shoulder seal; D. a threaded connection; E. a main seal; F. an inner shoulder seal.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1 to 4, a direct-connection type oil casing threaded joint includes an external threaded joint 100 and an internal threaded joint 200, the external threaded joint 100 and the internal threaded joint 200 constituting an external shoulder seal portion C, a threaded connection portion D, a main seal portion E, and an internal shoulder seal portion F in this order from outside to inside in the axial direction (X direction shown in fig. 1) of the direct-connection type oil casing threaded joint; an annular reinforcing support stand 10 is provided on the outer wall of the externally threaded joint 100 in a protruding manner, the reinforcing support stand 10 being located between the threaded connection D and the internal shoulder seal portion F, and the main seal portion E includes a first external seal surface 101 provided on the reinforcing support stand 10, and a first internal seal surface 201 provided on the internally threaded joint 200 and in sealing engagement with the first external seal surface 101.
The direct-connection type oil casing threaded joint in this embodiment, through setting up the reinforcing brace table 10 on its part of the external threaded joint 100, and set up the first external seal face 101 of the main seal portion E on this reinforcing brace table 10, the sealing thickness of the external threaded joint 100 of first external seal face 101 department has not only reached the purpose that improves the compressive resistance and the sealed effect of whole direct-connection type oil casing threaded joint, make it have compressive resistance and sealing performance good advantage, and do not have the annular clearance to diminish or/and the problem that oil casing latus rectum reduces moreover, make direct-connection type oil casing threaded joint's application scope wider, the use demand of direct-connection type oil casing threaded joint under the different circumstances has been satisfied.
As shown in fig. 1 to 4, the screw connection portion D in the present embodiment includes an external screw thread structure 11 provided on the external screw thread joint 100, and an internal screw thread structure 21 provided on the internal screw thread joint 200 and screw-connected with the external screw thread structure 11; the reinforcing support table 10 is engaged with the cutter lifting groove 111 of the external thread structure 11, and one end of the reinforcing support table 10 close to the cutter lifting groove 111 is high, and one end of the reinforcing support table 10 close to the inner shoulder sealing part F is low; the height of the screw thread 112 of the external screw thread structure 11 is H, the bottom of the cutter lifting groove 111 is 0.05-0.5 mm lower than the root of the screw thread, and the higher end of the reinforcing support table 10 is 0.1-H higher than the bottom of the cutter lifting groove 111.
With such a structure, the reinforcing support stand 10 is prevented from interfering with the threaded connection of the external thread structure 11 and the internal thread structure 21.
As shown in fig. 1 to 4, the first outer seal surface 101 and the first inner seal surface 201 in this embodiment have an angle a with the axial direction of the threaded joint of the direct-connection type oil casing of 1 ° or more and 30 ° or less, and in order to secure the sealing effect, a=3° is preferable in this embodiment.
As shown in fig. 1 to 4, the external thread structure 11 and the internal thread structure 21 in the present embodiment have taper, the reinforcing support stand 10 is provided with a protection surface 103 having the same taper as the external thread structure 11, the protection surface 103 is located between the cutter lifting groove 111 and the first external sealing surface 101, and the protection surface 103 is in arc transition connection with the first external sealing surface 101. When the external thread structure 11 and the internal thread structure 21 are in threaded connection and collide, the protection surface 103 is used for resisting external collision, so that the collision of the first external sealing surface 101 can be avoided, and the first external sealing surface 101 is ensured not to be damaged.
As shown in fig. 1 to 4, the reinforcing support stand 10 and the cutter raising groove 111 are connected by a chamfer 113 in the present embodiment. The chamfer 113 not only serves to reduce stress concentration and strengthen the strength of the externally threaded joint 100, but also removes burrs, making the externally threaded joint 100 more attractive.
As shown in fig. 1 to 4, the internal wall of the internally threaded joint 200 in the present embodiment is provided with an internal shoulder 20, and the end of the externally threaded joint 100 and the internal shoulder 20 form an internal shoulder seal portion F; the end surface of the external thread joint 100 is a second external sealing surface 102, the shoulder surface of the internal shoulder 20 is a second internal sealing surface 202 matched with the second external sealing surface 102, the first external sealing surface 101 is in arc transition connection with the second external sealing surface 102, and the first internal sealing surface 201 is in arc transition connection with the second internal sealing surface 202. By providing the second outer sealing surface 102 and the second inner sealing surface 202, a seamless fit of the inner shoulder 20 with the end of the externally threaded joint 100 is achieved, further improving the tightness of the straight-on type oil-in-tube threaded joint.
In this embodiment, the angle between the second outer sealing surface 102 and the second inner sealing surface 202 and the radial direction (Y direction shown in fig. 1) of the straight-connecting type oil-casing threaded joint is 0 ° to 20 °, and in order to improve the sealing effect, the angle between the second outer sealing surface 102 and the second inner sealing surface 202 and the radial direction of the straight-connecting type oil-casing threaded joint is preferably 0 °.
As shown in fig. 1 to 4, the external wall of the externally threaded joint 100 in the present embodiment is provided with an external shoulder 12, and the end portion of the internally threaded joint 200 and the external shoulder 12 form an external shoulder seal portion C; the outer shoulder 12 is provided with a third outer sealing surface 121 and a fourth outer sealing surface 122 which are arranged at an included angle, the end part of the internal thread joint 200 is provided with a third inner sealing surface 221 which is in sealing fit with the third outer sealing surface 121 and a fourth inner sealing surface 222 which is in sealing fit with the fourth outer sealing surface 122, and the third outer sealing surface 121 and the third inner sealing surface 221 are positioned on the inner side of the fourth outer sealing surface 122 and the fourth inner sealing surface 222. The sealing performance of the threaded joint of the direct-connection type oil sleeve is further improved by the arrangement of the outer shoulder sealing part C.
In the embodiment, the included angle between the third outer sealing surface 121 and the third inner sealing surface 221 and the axial direction of the threaded joint of the direct-connection type oil sleeve is b, and b is more than or equal to 0 and less than or equal to 45 degrees; the fourth outer sealing surface 122 and the fourth inner sealing surface 222 have an angle c with the radial direction of the threaded joint of the direct-connect oil casing of 0 c 30. In order to improve the sealing effect, b=30°, c=15° is preferable in this embodiment.
As shown in fig. 1 to 4, in this embodiment, the external thread structure 11 and the internal thread structure 21 are both of an improved buttress thread type with a pitch P, the bottom surface of the rake groove 111 is a conical surface with the same taper as the external thread structure 11, and the width of the rake groove 111 is P-1.5P, however, the bottom surface of the rake groove 111 may also be a cylindrical surface, which is specifically selected according to practical requirements, and this embodiment is not limited thereto.
The above is only a preferred embodiment of the direct connection type oil casing threaded joint of the present utility model, and further embodiments are not described herein.
By introducing the embodiment, the direct-connection type oil casing threaded joint not only achieves the aim of improving the compression resistance and the sealing effect of the whole direct-connection type oil casing threaded joint, so that the direct-connection type oil casing threaded joint has the advantages of good compression resistance and sealing performance, but also has no problems of small annular clearance or/and reduced oil casing drift diameter, so that the application range of the direct-connection type oil casing threaded joint is wider, and the use requirements of the direct-connection type oil casing threaded joint under different conditions are met.
The present utility model is not limited to the above-described specific embodiments, and various modifications made by those skilled in the art without inventive efforts from the above-described concept are within the scope of the present utility model.
Claims (10)
1. The direct-connection type oil casing threaded joint is characterized by comprising an external threaded joint and an internal threaded joint, wherein the external threaded joint and the internal threaded joint sequentially form an external shoulder sealing part, a threaded connection part, a main sealing part and an internal shoulder sealing part from outside to inside along the axial direction of the direct-connection type oil casing threaded joint;
the outer wall of the external threaded joint is convexly provided with an annular reinforcing supporting table, the reinforcing supporting table is positioned between the threaded connection part and the inner shoulder sealing part, and the main sealing part comprises a first external sealing surface arranged on the reinforcing supporting table and a first internal sealing surface arranged on the internal threaded joint and in sealing fit with the first external sealing surface.
2. The direct-connect oil casing threaded joint according to claim 1, wherein the threaded connection portion includes an external thread structure provided on the external thread joint, and an internal thread structure provided on the internal thread joint and screwed with the external thread structure; the reinforcing support table is connected with the cutter lifting groove of the external thread structure, one end of the reinforcing support table, which is close to the cutter lifting groove, is high, and one end of the reinforcing support table, which is close to the inner shoulder sealing part, is low; the height of the thread of the external thread structure is H, the bottom of the cutter lifting groove is 0.05-0.5 mm lower than the root of the thread, and the higher end of the reinforced supporting table is 0.1-H higher than the bottom of the cutter lifting groove.
3. The direct-connect oil-in-tube threaded joint according to claim 2, wherein an angle between the first outer sealing surface and the first inner sealing surface and an axial direction of the direct-connect oil-in-tube threaded joint is a,1 ° -a-30 °.
4. The direct-connect oil casing threaded joint according to claim 3, wherein the external thread structure and the internal thread structure have tapers, a protection surface identical to the taper of the external thread structure is provided on the reinforcing support table, the protection surface is located between the cutter lifting groove and the first external sealing surface, and the protection surface is in arc transition connection with the first external sealing surface.
5. The direct connect oil casing threaded joint of claim 4, wherein the reinforcing support stand is in a chamfer transition with the clearance groove.
6. The direct-connect oil casing threaded joint according to claim 1, wherein an inner shoulder is provided on an inner wall of the female threaded joint, an end portion of the male threaded joint and the inner shoulder forming the inner shoulder seal; the end face of the external thread joint is a second external sealing face, the shoulder face of the internal shoulder is a second internal sealing face matched with the second external sealing face, the first external sealing face is in arc transition connection with the second external sealing face, and the first internal sealing face is in arc transition connection with the second internal sealing face.
7. The direct-connect oil-in-pipe threaded joint according to claim 6, wherein the angle between the second outer sealing surface and the second inner sealing surface and the radial direction of the direct-connect oil-in-pipe threaded joint is 0 ° to 20 °.
8. The direct-connect oil casing threaded joint according to claim 1, wherein an outer shoulder is provided on an outer wall of the male threaded joint, and an end portion of the female threaded joint and the outer shoulder form the outer shoulder seal; the outer shoulder is provided with a third outer sealing surface and a fourth outer sealing surface which are arranged at an included angle, the end part of the internal thread joint is provided with a third inner sealing surface which is in sealing fit with the third outer sealing surface and a fourth inner sealing surface which is in sealing fit with the fourth outer sealing surface, and the third outer sealing surface and the third inner sealing surface are positioned on the inner sides of the fourth outer sealing surface and the fourth inner sealing surface.
9. The direct-connect oil-in-tube threaded joint according to claim 8, wherein an angle between the third outer sealing surface and the third inner sealing surface and an axial direction of the direct-connect oil-in-tube threaded joint is b,0 ° -b +.ltoreq.45°.
10. The direct-connect oil-in-tube threaded joint according to claim 8, wherein an angle between the fourth outer sealing surface and the fourth inner sealing surface and a radial direction of the direct-connect oil-in-tube threaded joint is c, and c is 0 ° or less and 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321710932.6U CN220081351U (en) | 2023-07-01 | 2023-07-01 | Directly-connected oil casing threaded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321710932.6U CN220081351U (en) | 2023-07-01 | 2023-07-01 | Directly-connected oil casing threaded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220081351U true CN220081351U (en) | 2023-11-24 |
Family
ID=88821562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321710932.6U Active CN220081351U (en) | 2023-07-01 | 2023-07-01 | Directly-connected oil casing threaded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220081351U (en) |
-
2023
- 2023-07-01 CN CN202321710932.6U patent/CN220081351U/en active Active
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