A tubing hanger that can be pressure tested in reverse

Abstract

The utility model discloses a tubing hanger device of reverse pressure test can, include: setting in tubing cross inner tubing hanger device body, tubing hanger device body is provided with tubing, tubing hanger device body with tubing cross's first pass and second pass between being provided with top wedge structure, tubing with tubing cross's third pass and fourth pass between being provided with bottom wedge structure, tubing hanger device body outside with tubing cross's main pass between being provided with through sealing fit's shaft sleeve and gland, tubing lower end outside with tubing cross's main pass between being provided with rubber cylinder structure in near bottom wedge structure. The utility model discloses a tubing hanger device, high safety factor, convenient installation, and keep long -term work's stability, reliability, and its service life is long.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil and gas drilling and production equipment, specifically relating to a tubing suspension device that can be reverse pressure tested. Background Technology

[0002] The tubing suspension system is a crucial component connecting the tubing head and the tubing. Its structure must suspend the weight of the tubing string and seal the annulus between the tubing and casing. In existing technologies, the sealing structure of traditional tubing suspension systems is mostly a unidirectional design (only adaptable to forward pressure from the wellhead to the bottom of the well). When reverse pressure occurs within the tubing cross section (such as bottomhole fluid backflow), the seals are prone to failure due to the opposite force direction, or the existing set screw structure may cause annular leakage. Some improved solutions achieve bidirectional sealing by adding a reverse rubber sleeve or mechanical locking ring, but these solutions suffer from structural complexity, require specialized tools for positioning during installation, resulting in high maintenance costs and reliability heavily influenced by assembly precision.

[0003] The reverse pressure bearing capacity of tubing hangers has always been affected by multiple factors, including the limitations of existing set screw structures and the body sealing structure.

[0004] Therefore, it is necessary to design a compact tubing suspension device that achieves reverse pressure sealing through structural improvements. During use, it should not experience sealing failure or plastic deformation due to reverse pressure, thereby improving adaptability to reverse working conditions, facilitating subsequent production operations, reducing valve usage during well workovers, and enhancing product safety. Utility Model Content

[0005] To address the problems of complex reverse sealing structures and insufficient reliability in existing tubing suspension devices, this utility model provides a tubing suspension device capable of reverse pressure testing.

[0006] This utility model discloses a tubing suspension device for well completion and workover operations in oil and gas wells, which is particularly suitable for high-pressure oil and gas wells that need to withstand reverse pressure conditions.

[0007] By optimizing the structure and assembly relationship between the sealing components and the pressure control mechanism, reliable sealing under reverse pressure is achieved, and the structure is simple and easy to install.

[0008] To achieve the purpose of this utility model, the technical solution adopted is as follows: A reverse-pressure-testable tubing suspension device, comprising: The main body of the oil pipe suspension device is installed inside the oil pipe cross; The oil pipe is installed inside the body of the oil pipe suspension device; A top wedge structure is provided between the main body of the oil pipe suspension device and the first and second passages of the oil pipe cross. A bottom wedge structure is provided between the oil pipe and the third and fourth passages of the oil pipe cross; A bushing and a pressure cap are provided between the outer side of the oil pipe suspension device body and the main passage of the oil pipe cross section, which are sealed together. A rubber sleeve structure is provided between the outer side of the lower end of the oil pipe and the main passage of the oil pipe cross section near the bottom wedge structure.

[0009] In a preferred embodiment of this utility model, the top wedge structure is disposed in the annular groove of the tubing cross, and a set screw is disposed in the top wedge structure. The top wedge structure is moved by rotating the set screw, thereby achieving radial pressing on the groove of the tubing suspension device body.

[0010] In a preferred embodiment of this utility model, the bottom wedge structure is disposed in the annular groove of the oil pipe four-way, and a set screw is provided in the bottom wedge structure. By rotating the set screw, the bottom wedge structure can be moved, thereby achieving radial compression of the bottom inclined surface of the rubber sleeve structure.

[0011] In a preferred embodiment of this utility model, the body of the oil pipe suspension device is mounted on the bearing step of the oil pipe cross and sealed by a metal seal, and a support base is designed at the bottom of the bearing step. The main body of the tubing suspension device is connected to a support ring located at the lower end of the support base via a threaded groove. The lower end of the tubing suspension device body is connected to the bushing via another threaded groove to seal the connection between the tubing suspension device body and the tubing.

[0012] In a preferred embodiment of the present invention, one end of the bushing is connected to the body of the oil pipe suspension device, and the other end is connected to the gland, and a sealing assembly is installed inside.

[0013] In a preferred embodiment of the present invention, the sealing assembly is installed inside the bushing, one end of the sealing assembly contacts the step of the oil pipe suspension device body, and the other end is pressed and activated by the pressure cap.

[0014] In a preferred embodiment of this utility model, the sealing assembly is a plurality of rubber sealing rings or sealing elements.

[0015] The sealing assembly can achieve bidirectional sealing and can withstand bidirectional pressure from both inside the oil pipe and inside the oil pipe cross.

[0016] In a preferred embodiment of this invention, the pressure cap is rotatable. The tightness of the sealing assembly is adjusted by rotating the pressure cap. The pressure cap is designed with anti-rotation screw holes for fixing the position of the pressure cap after sealing is activated.

[0017] In a preferred embodiment of this utility model, the rubber sleeve structure is installed in reverse at the bottom of the oil pipe four-way, one end of the rubber sleeve structure contacts the inner step of the oil pipe four-way, and the other end of the rubber sleeve structure is pressed by the bottom wedge of the oil pipe four-way. The interior of the rubber sleeve structure is used to seal the connection of the oil pipe extending from the body of the oil pipe suspension device.

[0018] Because of the above structure, the beneficial effects of this utility model are as follows: Compared with the prior art, the oil pipe suspension device with reverse pressure testing capability of this utility model can bring the following beneficial effects: This invention achieves excellent sealing performance under reverse pressure by using an independently set metal seal, a wedge-shaped tightening structure that increases the contact area, and rubber auxiliary sealing. Moreover, the use of a metal seal can better adapt to different working conditions.

[0019] This invention integrates bidirectional sealing components into the suspension body, eliminating the need for external complex parts and shortening the overall axial length compared to existing technologies.

[0020] This invention achieves pre-tightening and locking of the sealing component through a threaded locking nut, eliminating the need for special tools and improving on-site assembly efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0023] Figure 1 The winning numbers are as follows: like Figure 1 The illustrated oil pipe suspension device, which can be reverse pressure tested, includes an oil pipe suspension device body 1 disposed within an oil pipe cross 100.

[0024] The main body 1 of the tubing suspension device is mounted on the bearing step of the tubing cross 100 and sealed by the metal seal 10. A support seat 11 is designed at the bottom of the bearing step. The sealing performance of the metal seal 10 is activated by the self-weight of the main body 1 of the tubing suspension device and the compression of the top wedge structure 2 (metal seal).

[0025] The metal seal 10 can be made of austenitic stainless steel.

[0026] The tubing hanger body has a hexagonal structure with a length of about 60mm, which is used to tighten the tubing 13 with clamps when connecting it on site.

[0027] The main body 1 of the oil pipe suspension device is connected to the support ring 12 located at the lower end of the support base 11 via a threaded groove.

[0028] The lower end of the tubing suspension device body 1 is connected to the bushing 3 through another threaded groove to seal the connection between the tubing suspension device body 1 and the tubing 13 (rubber seal).

[0029] An oil pipe 13 is installed inside the body 1 of the oil pipe suspension device.

[0030] A top wedge structure 2 is provided between the main body 1 of the oil pipe suspension device and the first and second passages of the oil pipe cross 100.

[0031] The top wedge structure 2 is set in the annular groove 101 of the oil pipe four-way 100, and the top wedge structure 2 is equipped with a set screw 8, the top of the set screw 8 adopts a flat head design.

[0032] The top wedge structure 2 is moved by rotating the set screw, thereby achieving radial clamping at the groove 1a of the tubing suspension device body 1.

[0033] The wedge of the top wedge structure 2 adopts an integral ring design and is divided into four wedges by wire cutting. This structure increases the contact area between the set screw and the body 1 of the tubing suspension device, enabling the set screw to withstand a greater load, thereby effectively improving the compressive strength of the body 1 of the tubing suspension device.

[0034] A bottom wedge structure 7 is provided between the third and fourth passages of the oil pipe 13 and the oil pipe cross 100. The bottom wedge structure 7 is set in the annular groove 102 of the oil pipe four-way 100, and the bottom wedge structure 7 is equipped with a set screw 9, the top of which adopts a flat head design.

[0035] By rotating the set screw to move the bottom wedge structure 7, radial compression is achieved at the bottom inclined surface 6a of the rubber sleeve structure 6.

[0036] A bushing 3 and a pressure cap 5 are provided between the outer side of the tubing suspension device body 1 and the main passage of the tubing cross 100 through a sealing fit. One end of the bushing 3 is connected to the tubing suspension device body 1, and the other end is connected to the pressure cap 5. A sealing assembly 4 is installed inside.

[0037] The sealing assembly 4 is installed inside the bushing 3. One end of the sealing assembly 4 contacts the step of the oil pipe suspension device body 1, and the other end is pressed and activated by the pressure cap 5. The sealing assembly 4 consists of several rubber sealing rings or sealing elements.

[0038] The sealing assembly 4 can achieve bidirectional sealing and can withstand bidirectional pressure from both inside the oil pipe and inside the oil pipe cross.

[0039] The gland 5 is rotatable. The tightness of the sealing assembly 4 can be adjusted by rotating the gland 5. The gland 5 is designed with anti-rotation screw holes to fix the position of the gland 5 after the seal is activated.

[0040] A rubber sleeve structure 6 is provided near the bottom wedge structure 7 between the outer side of the lower end of the oil pipe 13 and the main passage of the oil pipe cross 100.

[0041] The rubber sleeve structure 6 is installed in reverse at the bottom of the oil pipe cross 100. One end of the rubber sleeve structure 6 contacts the inner step of the oil pipe cross 100, and the other end of the rubber sleeve structure 6 is pressed by the bottom wedge block 7 of the oil pipe cross 100. The inside of the rubber sleeve structure 6 is used to seal the connection of the oil pipe 13 extending from the oil pipe suspension device body 1.

[0042] All components employ a modular design for easy interconnection. Unless otherwise specified, such as rubber seals, all other components are made of common metal materials suitable for oil and gas well completion and workover operations.

[0043] Because of the above structure, the working principle of this utility model is as follows: The rubber sleeve structure 6 is installed at the bottom of the oil pipe four-way 100. Rotate the bottom set screw 9 to drive the bottom wedge block structure 7 to contact the inclined surface of the rubber sleeve structure 6. Without tightening, connect the oil pipe four-way 100 to the bottom four-way flange (not shown in the figure).

[0044] The metal seal 10 and the rubber seal assembly 4 are installed on the body 1 of the oil pipe suspension device.

[0045] The mounting support 11 is installed at the bottom of the tubing suspension device body 1. The support ring 12 is installed on the tubing suspension device body 1 by thread, and the anti-rotation screw is tightened.

[0046] Install the bushing 3 onto the tubing suspension device body 1 via threads, screwing it to the step of the tubing suspension device body 1. Install the combined seal 4 into the bushing 3. Connect the gland 5 onto the bushing 3 via threads, screwing it until it contacts the rubber seal assembly 4, without tightening.

[0047] Connect the oil pipe 13 to the oil pipe suspension device body 1. During installation, use calipers to clamp the hexagonal part of the oil pipe suspension device body 1 and rotate the oil pipe suspension device body 1 to tighten to the required torque. Tighten the pressure cap 5, activate the combined seal 4, lift the oil pipe suspension device body 1 directly above the oil pipe tee 100 and slowly lower it in, keeping it centered during the lowering process. Lower it until the support base 11 contacts the step of the oil pipe tee 100, indicating that it has been lowered into place. Tighten the top set screw 8 to push the top wedge 2 to press the oil pipe suspension device 1, and tighten the bottom set screw 9 to push the bottom wedge 7 to press the rubber sleeve structure 6.

Claims

1. A tubing suspension device capable of reverse pressure testing, characterized in that, include: The main body of the oil pipe suspension device is installed inside the oil pipe cross; The oil pipe is installed inside the body of the oil pipe suspension device; A top wedge structure is provided between the main body of the oil pipe suspension device and the first and second passages of the oil pipe cross. A bottom wedge structure is provided between the oil pipe and the third and fourth passages of the oil pipe cross; A bushing and a pressure cap are provided between the outer side of the oil pipe suspension device body and the main passage of the oil pipe cross section, which are sealed together. A rubber sleeve structure is provided between the outer side of the lower end of the oil pipe and the main passage of the oil pipe cross section near the bottom wedge structure.

2. The oil pipe suspension device capable of reverse pressure testing as described in claim 1, characterized in that, The top wedge structure is set in the annular groove of the tubing cross, and a set screw is provided in the top wedge structure. By rotating the set screw, the top wedge structure can be moved, thereby achieving radial compression of the groove of the tubing suspension device body.

3. The oil pipe suspension device capable of reverse pressure testing as described in claim 1, characterized in that, The bottom wedge structure is set in the annular groove of the oil pipe four-way valve. The bottom wedge structure is provided with a set screw. By rotating the set screw, the bottom wedge structure can be moved, thereby achieving radial compression of the bottom inclined surface of the rubber sleeve structure.

4. The oil pipe suspension device capable of reverse pressure testing as described in claim 1, characterized in that, The main body of the oil pipe suspension device is mounted on the bearing step of the oil pipe cross and sealed by a metal seal. A support base is designed at the bottom of the bearing step. The main body of the tubing suspension device is connected to a support ring located at the lower end of the support base via a threaded groove. The lower end of the tubing suspension device body is connected to the bushing via another threaded groove to seal the connection between the tubing suspension device body and the tubing.

5. The oil pipe suspension device capable of reverse pressure testing as described in claim 1, characterized in that, One end of the bushing is connected to the body of the oil pipe suspension device, and the other end is connected to the gland. A sealing assembly is installed inside.

6. The oil pipe suspension device capable of reverse pressure testing as described in claim 5, characterized in that, The sealing assembly is installed inside the bushing. One end of the sealing assembly contacts the step of the oil pipe suspension device body, and the other end is pressed and activated by the gland.

7. The oil pipe suspension device capable of reverse pressure testing as described in claim 6, characterized in that, The sealing assembly consists of several rubber sealing rings or sealing elements.

8. The oil pipe suspension device capable of reverse pressure testing as described in claim 1, characterized in that, The pressure cap is rotatable.

9. A tubing suspension device capable of reverse pressure testing as described in claim 1, characterized in that, The rubber sleeve structure is installed in reverse at the bottom of the oil pipe four-way. One end of the rubber sleeve structure contacts the inner step of the oil pipe four-way, and the other end of the rubber sleeve structure is pressed by the bottom wedge of the oil pipe four-way. The interior of the rubber sleeve structure is used to seal the connection of the oil pipe extending from the body of the oil pipe suspension device.

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