CN219472042U

CN219472042U - Economical oil casing coupling

Info

Publication number: CN219472042U
Application number: CN202320722931.7U
Authority: CN
Inventors: 张国辉; 武磊
Original assignee: Tianjin Dehua Petroleum Equipment Manufacturing Co Ltd
Current assignee: Tianjin Dehua Petroleum Equipment Manufacturing Co Ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2023-08-04
Anticipated expiration: 2033-04-04

Abstract

The utility model discloses an economic petroleum casing coupling, which comprises a big head section, a transition section and a small head section which are connected in sequence, wherein the transition section is a conical section, the big head section is connected with the big diameter end of the transition section, and the small head section is connected with the small diameter end of the transition section; the inner side of the end part of the big head section is provided with an inner connecting structure, and the outer side of the end part of the small head section is provided with an outer connecting structure. The application provides an economic petroleum casing coupling, which is a reducing coupling. This application has first cover and the second cover of strengthening of threaded connection respectively at the coupling both ends, can increase the leakproofness, the thermal-insulated nature and the joint strength of coupling and oil casing body junction through first cover and the second cover of strengthening.

Description

Economical oil casing coupling

Technical Field

The utility model relates to the technical field of oil casing structures for oil and gas drills, in particular to an economic petroleum casing coupling.

Background

The existing exploitation environment conditions of the oil and gas well are worse, and the exploitation direction of the oil and gas well is rapidly developed towards the exploitation direction of deep wells, ultra-deep wells, high-pressure oil and gas wells, thick oil thermal recovery wells, directional wells and the like. The petroleum casing collar is a connecting part of petroleum casing and plays a vital role in the petroleum exploitation process. Because oil layers of oil and gas wells are distributed and have different geological conditions, structures such as inclination angles, well diameters and the like are different at different depths of the oil and gas wells, and therefore, oil casings with different specifications need to be connected with each other. In the traditional technology, when two kinds of petroleum casings with different specifications are mutually connected in the industry, the two petroleum casings are connected with corresponding couplings respectively, then the two couplings are connected by utilizing a transition pipe, and the connection mode ensures that the connection points are more, and the connection strength, the sealing performance and the heat insulation performance of the whole petroleum casing are seriously affected. In view of the above, the industry also develops and designs the reducing coupling, and the reducing coupling can be used for directly connecting petroleum casings of different specifications, so that the reducing coupling has the technical advantages of reducing the cost of products, improving the connection strength, sealing and heat insulation performance of the products, and the like.

With the development and progress of technology, the industry continuously innovates and improves the structure of the reducing coupling so as to improve the service performance of the reducing coupling, thereby meeting the use requirements of users.

Disclosure of Invention

The utility model aims to provide an economic petroleum casing coupling for meeting the use requirements of users.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

an economic petroleum casing coupling comprises a big head section, a transition section and a small head section which are connected in sequence, wherein the transition section is a conical section, the big head section is connected with a big diameter end of the transition section, and the small head section is connected with a small diameter end of the transition section;

the inner side of the end part of the big head section is provided with an inner connecting structure, the outer side of the end part of the small head section is provided with an outer connecting structure, the outer side of the end part of the big head section is thickened, the circumferential surface of the outer side of the thickened part is provided with a first outer connecting thread, the outer side of the big head section is provided with a first reinforcing sleeve, the inner side of the first reinforcing sleeve is provided with a first inner connecting thread, and the first inner connecting thread is connected with the first outer connecting thread;

the outer circumferential surface of the small head section is provided with a second external connecting thread, the outer side of the small head section is provided with a second reinforcing sleeve, the inner side of the second reinforcing sleeve is provided with a second internal connecting thread, and the second internal connecting thread is connected with the second external connecting thread.

Compared with the prior art, the utility model has the beneficial effects that:

the application provides an economic petroleum casing coupling, which is a reducing coupling. This application has first cover and the second cover of strengthening of threaded connection respectively at the coupling both ends, can increase the leakproofness, the thermal-insulated nature and the joint strength of coupling and oil casing body junction through first cover and second cover of strengthening, is convenient for popularize and use in the industry.

Drawings

Fig. 1 is a schematic structural diagram provided in an embodiment of the present application;

FIG. 2 is a schematic view of an interconnect structure according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an external connection structure according to an embodiment of the present application;

in the figure, a big end section 1, a transition section 2, a small end section 3, a second supporting ring 4, a second heat insulation cavity 5, a second reinforcing sleeve 6, a second elastic sealing ring 7, a first elastic sealing ring 8, a first supporting ring 9, a first heat insulation cavity 10, a first reinforcing sleeve 11, a first inclined guiding sealing surface 13, a first inner thread section 14, a first inner cone sealing surface 15, a second inner thread section 16, a second inner cone sealing surface 17, an inner torque resisting shoulder 18, an outer sealing shoulder 19, a second inclined guiding sealing surface 20, a second outer thread section 21, a second outer cone sealing surface 22, a first outer thread section 23, a first outer cone sealing surface 24 and an outer torque resisting shoulder 12.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1-3, an embodiment structure of the present application is shown.

The embodiment discloses an economic petroleum casing coupling, which comprises a big head section 1, a transition section 2 and a small head section 3 which are sequentially connected, wherein the transition section 2 is a conical section, the big head section 1 is connected with the big diameter end of the transition section 2, and the small head section 3 is connected with the small diameter end of the transition section 2;

an inner connecting structure is arranged on the inner side of the end part of the big head section 1, and an outer connecting structure is arranged on the outer side of the end part of the small head section 3;

the end part of the big head section 1 is thickened in the outer side, a first external connecting thread is arranged on the circumferential surface of the outer side of the thickened part, a first reinforcing sleeve 11 is sleeved on the outer side of the big head section 1, a first internal connecting thread is arranged on the inner side of the first reinforcing sleeve 11, and the first internal connecting thread is in threaded connection with the first external connecting thread.

The outer circumferential surface of the small head section 3 is provided with second external connecting threads, the outer side of the small head section 3 is sleeved with a second reinforcing sleeve 6, the inner side of the second reinforcing sleeve 6 is provided with second internal connecting threads, and the second internal connecting threads are in threaded connection with the second external connecting threads.

The application provides an economic petroleum casing coupling, which is a reducing coupling. This application has first cover and the second cover of strengthening of threaded connection respectively at the coupling both ends, can increase the leakproofness, the thermal-insulated nature and the joint strength of coupling and oil casing body junction through first cover and the second cover of strengthening.

Preferably, a first annular groove is formed on the outer side of the inner side end of the first reinforcing sleeve 11, a first elastic sealing ring 8 is arranged in the first annular groove, and the part of the inner side end surface of the first elastic sealing ring 8, which is close to the outer side, is an opening with large outer side and small inner side. The structure can improve the sealing performance, and the open structure can play a role in guiding.

Preferably, a second annular groove is arranged on the outer side of the inner side end of the second reinforcing sleeve 6, a second elastic sealing ring 7 is arranged in the second annular groove, and the part of the inner side end surface of the second elastic sealing ring 7, which is close to the outer side, is an opening with large outer side and small inner side. The structure can improve the sealing performance, and the open structure can play a role in guiding.

Preferably, an annular first heat insulation cavity 10 is arranged inside the first reinforcing sleeve 11, heat insulation materials are filled in the first heat insulation cavity, an annular second heat insulation cavity 5 is arranged inside the second reinforcing sleeve 6, and heat insulation materials are filled in the second heat insulation cavity.

Wherein, the heat insulation material adopts the materials in the prior art.

Preferably, a plurality of first supporting rings 9 are arranged in the first heat insulation cavity 10 at intervals along the axial direction of the first reinforcing sleeve, wherein each first supporting ring is provided with a transverse through hole, so that the heat insulation material in the first heat insulation cavity is convenient to fill and vacuumize, and the heat insulation performance of the coupling is greatly improved.

Preferably, a plurality of second supporting rings 4 are arranged in the second heat insulation cavity 5 at intervals along the axial direction of the second reinforcing sleeve, wherein each second supporting ring 4 is provided with a transverse through hole, so that the filling and vacuumizing of the heat insulation materials in the second heat insulation cavity are facilitated, and the heat insulation performance of the coupling is greatly improved.

Preferably, the internal connection structure comprises a first internal thread section 14 and a second internal thread section 16, the external connection structure comprises a second external thread section 21 and a first external thread section 23, and the first internal thread section 14, the second internal thread section 16, the second external thread section 21 and the first external thread section 23 are all API standard threads. Currently, in order to improve the connection strength and sealing performance between a pipe body and a coupling for an oil and gas well under complex working conditions, the industry generally adjusts the specification of threads, such as adjusting the profile of teeth. The method is time-consuming and labor-consuming, and can increase the processing cost, and because the method still uses the traditional API standard thread, the thread structure is not changed, and a double-thread connection mode is used for improving the connection strength, the sealing performance and the like

As shown in FIG. 2, the double-thread connecting structure is adopted, so that the connecting strength and the heat insulation performance of the product are greatly improved. The internal connection structure comprises a first inclined guiding sealing surface 13, a first internal thread section 14, a first internal conical sealing surface 15, a second internal thread section 16, a second internal conical sealing surface 17 and an internal torque-resisting shoulder 18 which can be used for installation and guiding from outside to inside in sequence, wherein the inner diameter of the second internal thread section 16 is smaller than the inner diameter of the first internal thread section 14. The structure is matched with the connecting structure of the pipe body. In addition, the joint of the second inner conical sealing surface 17 and the inner torque-resistant shoulder 18 is provided with an o-ring, so that the sealing performance of the connection of the coupling and the pipe body can be enhanced.

As shown in fig. 3, the external connection structure adopts a double-thread structure, and an external sealing shoulder 19, a second inclined guiding sealing surface 20, a second external thread section 21, a second external conical sealing surface 22, a first external thread section 23, a first external conical sealing surface 24 and an external torque-resisting shoulder 12 are sequentially arranged from inside to outside, wherein the inner diameter of the first external thread section 23 is smaller than the inner diameter of the second external thread section 21. The structure is matched with the connecting structure of the pipe body.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The economic petroleum casing coupling is characterized by comprising a big head section (1), a transition section (2) and a small head section (3) which are connected in sequence, wherein the transition section (2) is a conical section, the big head section (1) is connected with a big diameter end of the transition section (2), and the small head section (3) is connected with a small diameter end of the transition section (2);

an inner connecting structure is arranged on the inner side of the end part of the big head section (1), an outer connecting structure is arranged on the outer side of the end part of the small head section (3), the outer side of the end part of the big head section (1) is thickened, a first outer connecting thread is arranged on the periphery of the outer side of the thickened part, a first reinforcing sleeve (11) is arranged on the outer side of the big head section (1), a first inner connecting thread is arranged on the inner side of the first reinforcing sleeve (11), and the first inner connecting thread is connected with the first outer connecting thread;

the outer circumferential surface of the small head section (3) is provided with second external connecting threads, the outer side of the small head section (3) is provided with a second reinforcing sleeve (6), the inner side of the second reinforcing sleeve (6) is provided with second internal connecting threads, and the second internal connecting threads are connected with the second external connecting threads.

2. The economic petroleum casing coupling according to claim 1, wherein the inner side end of the first reinforcing sleeve (11) is provided with a first annular groove, a first elastic sealing ring (8) is arranged in the first annular groove, and the part of the inner side end surface of the first elastic sealing ring, which is close to the outer side, is an opening with large outside and small inside.

3. The economic petroleum casing coupling according to claim 1, wherein a second annular groove is arranged at the inner side end of the second reinforcing sleeve (6), a second elastic sealing ring (7) is arranged in the second annular groove, and the part, close to the outer side, of the inner side end surface of the second elastic sealing ring (7) is an opening with large outer side and small inner side.

4. An economical petroleum casing coupling according to claim 1, characterized in that the first reinforcing sleeve (11) is provided inside with a first insulating cavity (10) of annular shape, which is filled with insulating material.

5. An economic petroleum casing coupling according to claim 4, characterised in that a plurality of first support rings (9) are arranged axially spaced along the first reinforcing sleeve within the first insulating chamber (10).

6. An economical petroleum casing coupling according to claim 1, characterized in that the second reinforcing sleeve (6) is provided inside with a second insulating cavity (5) of annular shape, which is filled with insulating material.

7. An economic petroleum casing coupling according to claim 6, characterised in that a plurality of second support rings (4) are arranged in the second insulating chamber (5) at axial intervals along the second reinforcing sleeve.

8. The economic petroleum casing coupling according to claim 1, wherein the internal connection structure comprises a first internal thread section (14) and a second internal thread section (16), the external connection structure comprises a second external thread section (21) and a first external thread section (23), and the first internal thread section (14), the second internal thread section (16), the second external thread section (21) and the first external thread section (23) are API standard threads.