CN-224214147-U - Detachable and reusable casing hanger

Abstract

The utility model discloses a detachable and reusable casing hanger, and belongs to the technical field of oil and gas drilling equipment. The hanger aims to solve the problem that the existing hanger cannot be disassembled and reused without damage. The sleeve hanger comprises a C-shaped sleeve hanger body which is made of elastic metal materials and provided with a notch, and an annular retention sleeve which is arranged above the C-shaped sleeve hanger body. During the installation, the rotary retention sleeve applies axial pressure to the hanger body, so that the hanger body moves downwards along the inclined plane of the inner wall of the casing head and is radially tightened, thereby clamping the casing, and during the disassembly, the reverse rotation retention sleeve releases the pressure, and the hanger body automatically bounces off and releases by virtue of self elasticity. The utility model has simple structure, convenient installation and disassembly, and can realize complete nondestructive disassembly and repeated utilization, thereby remarkably reducing the operation cost and the material consumption.

Inventors

• SU YU
• ZHANG RUIJIA
• LV NING
• LIU CHUNPENG
• YAN HAIBO
• XU YIFAN
• LIU CHENXI

Assignees

• 胜利油田胜机石油装备有限公司

Dates

Publication Date

20260508

Application Date

20260311

Claims (6)

1. 1. A removable reusable casing hanger for hanging casing in a casing head (30), comprising: The casing hanger comprises a casing hanger body (10), wherein the casing hanger body (10) is of an integral annular structure made of elastic metal materials, a notch (11) which enables the annular structure to be C-shaped is formed in the annular structure, slip teeth (12) for clamping a casing are arranged on the inner wall of the casing hanger body (10), and an outer inclined surface (13) matched with an inner wall inclined surface (31) of a casing head (30) is arranged on the outer wall of the casing hanger body; A retention sleeve (20) of annular configuration, disposed above the casing hanger body (10), the retention sleeve (20) being configured to apply or withdraw axial pressure to the casing hanger body (10) by rotation; When the retention sleeve (20) rotates to apply axial pressure, the casing hanger body (10) moves downwards along the inner wall inclined surface (31) of the casing head (30) and is restrained by the inner wall inclined surface (31) to narrow the notch (11), so that the slip teeth (12) are driven to tighten inwards to clamp the casing; When the retention sleeve (20) rotates reversely to withdraw the axial pressure, the sleeve hanger body (10) opens the notch (11) by virtue of self elasticity, so that the slip teeth (12) release the sleeve.
2. 2. The reusable casing hanger according to claim 1, wherein the retention sleeve (20) is threadably connected to the casing head (30).
3. 3. The casing hanger of claim 1, wherein the casing hanger body (10) is spring steel.
4. 4. The casing hanger of claim 1, wherein the upper portion of the retention sleeve (20) is provided with serrations (21) for mating with an installation tool for transmitting torque.
5. 5. The casing hanger of claim 1, wherein the inner wall inclined surface (31) of the casing head (30) is provided with a sealing ring groove (32), and a sealing ring (40) is pre-installed in the sealing ring groove (32).
6. 6. The casing hanger of claim 1, wherein the slip segments (12) of the inner wall of the casing hanger body (10) are of one-way helical configuration.

Description

Detachable and reusable casing hanger Technical Field The utility model relates to the technical field of oil and gas drilling equipment, in particular to a casing hanger for hanging a casing at a wellhead. Background In oil and gas drilling operations, a casing hanger is a critical component of a wellhead assembly for hanging the weight of a casing string in the wellhead and sealing the annular space between the layers of casing. The existing slip type casing hanger is generally composed of a plurality of slip pieces which are separated, the structure is relatively complex, and the installation process is complex. More critical, such hangers are typically single use components. When the sleeve is required to be lifted out or the wellhead is dismounted, the sleeve is often required to be taken out by adopting destructive modes such as cutting sleeve, violent prying and smashing due to the self-locking principle and huge holding force after setting, so that the hanger body is completely scrapped, the operation difficulty and risk are increased, and huge waste of materials and cost is also caused. Therefore, there is an urgent need in the marketplace for a new casing hanger that is simple in structure, easy to install, and capable of being disassembled without damage to achieve reuse. Disclosure of utility model The utility model aims to solve the technical problems that the existing casing hanger is complex in structure and incapable of being disassembled and reused in a nondestructive way, and provides the casing hanger which is simple in structure, convenient to install, capable of being disassembled in a nondestructive way and capable of being reused. In order to achieve the above purpose, the utility model adopts the following technical scheme: A detachable and reusable casing hanger comprises a casing hanger body and a retention sleeve, wherein the retention sleeve is arranged in a casing head and is used for hanging a casing; The casing hanger body is a unitary annular structure formed of a resilient metal material, preferably spring steel. The integrated design replaces the traditional multi-piece slip, and the structure is simplified. The annular structure is provided with a C-shaped opening, and the opening enables the body to have elastic capacity of radial contraction and expansion. The inner wall of the casing hanger body is provided with slip teeth for clamping the casing, and the outer wall is provided with an outer inclined surface matched with a conical bowl (namely an inner wall inclined surface) of the inner wall of the casing head. The retainer sleeve is of an annular structure and is arranged above the casing hanger body, and a saw tooth structure matched with the installation tool is arranged on the upper portion of the retainer sleeve and used for applying rotation torque. The retention sleeve, by rotating, is able to actively apply or withdraw axial pressure to the casing hanger body. The retention sleeve is connected with the casing head through threads. In operation, when the retention sleeve is rotated clockwise, it applies a downward axial pressure to the casing hanger body, forcing the body to slide downward along the inside wall bevel of the casing head. Under the effect of the conical inclined plane, the body is forced to radially shrink, so that the C-shaped opening of the body is narrowed, and the slip teeth on the inner wall tightly hold and clamp the casing pipe, thereby realizing the reliable suspension of the whole casing string. When the fixing sleeve is disassembled, the downward axial pressure can be removed only by reversely (anticlockwise) rotating the fixing sleeve. After the pressure is relieved, the casing hanger body can automatically expand outwards by means of the elastic potential energy of the casing hanger body, so that the notch is restored to the original width, and the slip teeth release the casing. At this time, all parts of the sleeve and the hanger can be easily and completely taken out, and complete nondestructive disassembly is realized. Further, in order to provide basic sealing and isolation functions under low pressure or no-pressure ring air condition, a sealing ring groove can be formed on the inner wall inclined surface of the casing head, and a sealing ring is pre-installed. When the hanger body is set, the outer inclined surface of the hanger body is tightly pressed with the sealing ring to form an effective annular space barrier to prevent invasion of external impurities and leakage of internal liquid. If the sealing requirement is high, other sealing flanges can be connected on the sleeve head to strengthen the sealing. Further, slip teeth on the inner wall of the casing hanger body are of a unidirectional helical tooth structure, so that the casing can be effectively prevented from moving downwards. The utility model has the beneficial effects that: 1. The hanger can be repeatedly used, the cost is saved, the problem of disposable use of th