High-temperature fixed-point plugging device
By designing a high-temperature fixed-point plugging device, reliable in-pipe plugging is achieved at high temperatures using a working cylinder, plugging sealing body, and anchoring mechanism. This solves the leakage and well control safety hazards caused by the drop in reservoir pressure after steam injection depressurization in heavy oil production fields, and reduces the risks and heat loss of high-temperature operations.
Patent Information
- Application Number
- CN202422447518.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-10-10
AI Technical Summary
After steam injection depressurization in heavy oil production fields, the decrease in reservoir pressure leads to well control safety hazards such as well-killing fluid leakage and inter-well steam leakage during well workover operations. In addition, well-killing wash causes heat loss and oil reservoir contamination.
Design a high-temperature fixed-point sealing device, including a working cylinder, a sealing body, an anchoring mechanism, and a combined seal, which can achieve reliable in-pipe sealing in high-temperature environments. The anchoring and sealing of the sealing body are ensured by the anchoring groove and the limiting step, and the sealing reliability is achieved by using a high-temperature sealing rubber ring and a weight rod.
Effectively control the pressure inside the pipe during high-temperature operations, reduce operational risks, prevent well control fluid leakage and inter-well steam leakage, and reduce heat loss and reservoir contamination.
Smart Images
Figure CN223621574U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of petroleum extraction technology, and in particular relates to a high-temperature fixed-point sealing device. Background Technology
[0002] In oilfields primarily producing heavy oil, the pressure in the reservoirs drops significantly during depressurization processes such as steam injection. This leads to substantial loss of kill fluid during well workover operations, posing sudden well control safety hazards such as inter-well steam leakage. Additionally, pre-workover well washing and kill operations result in heat loss and reservoir contamination, leading to reduced production. Summary of the Invention
[0003] The purpose of this invention is to provide a high-temperature fixed-point sealing device that can achieve high-temperature pipe sealing, effectively control the pipe pressure, and reduce the risks of high-temperature operations.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] The high-temperature fixed-point sealing device of this utility model is characterized by comprising a working cylinder, and a sealing body disposed inside the working cylinder and anchored thereto.
[0006] The sealing body includes a main body, an anchoring mechanism, a sealing body threadedly connected to the main body, a combined seal disposed on the sealing body, and a weighting rod threadedly connected to the sealing body.
[0007] The anchoring mechanism includes two symmetrical locking blocks fixed to the main body by means of a pivot pin, and a torsion spring disposed in the locking blocks.
[0008] The combined seal consists of a spacer ring and a high-temperature sealing ring.
[0009] The weighting rod is a solid cylindrical metal body with a diameter of 32mm and a length of 1m.
[0010] The working cylinder is designed with an anchoring groove, a limiting step, and a sealing surface. The locking block is anchored in the anchoring groove. The combined seal and the sealing surface form a high-temperature seal. The limiting step prevents the sealing body from moving downward in the working cylinder.
[0011] Advantages of this utility model:
[0012] This utility model's high-temperature fixed-point sealing device can achieve in-pipe sealing of high-temperature wells. It is convenient and quick to deploy from the wellhead during operation. It is anchored to the working cylinder with locking blocks, making the seal more reliable. The sealing section is designed for high-temperature sealing. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is a schematic diagram of the internal structure of the working cylinder of this utility model.
[0015] Figure 3 This is a schematic diagram of the fitting of the tubular column and the working cylinder of this utility model. Detailed Implementation
[0016] The specific embodiments of this utility model are further described below with reference to the accompanying drawings.
[0017] like Figure 1 , 2 As shown in Figure 3, the high-temperature fixed-point sealing device of this utility model is characterized by comprising a working cylinder 5, and a sealing body disposed within the working cylinder 5 and anchored thereto.
[0018] The sealing body includes a main body 1, an anchoring mechanism, a sealing body 7 threadedly connected to the main body 1, a combined seal 6 disposed on the sealing body 7, and a weighting rod 8 threadedly connected to the sealing body 7.
[0019] The anchoring mechanism includes two symmetrical locking blocks 3 fixed to the main body 1 by means of a pivot pin 4, and a torsion spring 2 disposed in the locking blocks 3.
[0020] The combined seal 6 consists of a spacer ring and a high-temperature sealing ring.
[0021] The weighting rod 8 is a solid cylindrical metal body with a diameter of 32mm and a length of 1m.
[0022] The working cylinder 5 is internally designed with an anchoring groove 9, a limiting step 10, and a sealing surface 11. The locking block 3 is anchored in the anchoring groove 9. The combined seal 6 and the sealing surface 11 form a high-temperature seal. The limiting step 10 prevents the sealing body from moving downward in the working cylinder 5.
[0023] This utility model's high-temperature fixed-point sealing device can withstand temperatures up to 350℃ in high-temperature environments. The sealing body is the core component of the entire device; after entering the working cylinder 5, it can reliably anchor and seal with the working cylinder 5. The sealing body consists of a main body 1, a torsion spring 2, a locking block 3, a shaft pin 4, a combined seal 6, a sealing body 7, a weighting rod 8, and other parts.
[0024] The torsion spring 2, locking block 3, and shaft pin 4 form the anchoring mechanism for the sealing body. Locking block 3 consists of two symmetrical blocks, fixed to the main body 1 by the shaft pin 4. The torsion spring 2 is installed within the locking block 3, giving it elasticity and allowing it to extend and retract. After the locking block 3 enters the slot of the working cylinder 5, it opens and anchors, preventing it from being lifted upwards. The lower end of the working cylinder 5 is designed with a reduced-diameter step, preventing the sealing body from passing through after entering the working cylinder 5.
[0025] The combined seal 6 consists of a spacer ring and a high-temperature sealing ring, which are installed on the sealing body 7. The sealing body 7 is connected to the main body 1 by threads, forming an integral structure.
[0026] The weighting rod 8 is a solid cylindrical metal body with a diameter of mm and a length of 1m. It is connected to the sealing body 7 by threads and plays a weighting role after the tool is dropped into the well.
[0027] The internal design of the working cylinder 5 includes an anchoring groove 9, a limiting step 10, and a sealing surface 11, such as... Figure 2 As shown. The sealing block 3 is anchored in the anchoring groove 9; the combined seal 6 and the sealing surface of the working cylinder 5 form a high-temperature seal; the limiting step 10 prevents the sealing body from moving downward in the working cylinder 5.
[0028] Before the tubing string is lowered, the working cylinder 5 is connected to the designed position of the tubing string 12 and is lowered into the well along with the tubing string 12. When plugging is required, a plugging sealing body is dropped from the wellhead. The plugging sealing body enters the working cylinder 5 under the gravity of the weight rod 8, achieving sealing and anchoring within the working cylinder 5, completing the internal plugging and achieving the effect of controlling the internal pressure. Figure 3 As shown.
[0029] Example
[0030] The present invention provides a high-temperature fixed-point sealing device, the specific operation steps of which are as follows:
[0031] 1. Before lowering the tool into the well, check whether the anchoring and sealing mechanisms are functioning properly and whether the threaded connections are reliable;
[0032] 2. The working cylinder 5 is connected to the designed position of the tubing string 12 and is lowered into the well along with the tubing string 12;
[0033] 3. When sealing is required, the sealing body is delivered from the wellhead and enters the working cylinder 5 by the gravity of the weight rod 8;
[0034] 4. Pressurize from the wellhead. If the pressure gauge reads a reading, it proves that the sealing body has been delivered in place and has achieved anchoring and sealing with the working cylinder 5.
[0035] 5. When raising tubing string 12, the high-temperature fixed-point sealing device is raised along with tubing string 12. The sealing body is unsealed and removed, and the integrity of the high-temperature rubber sleeve is checked.
[0036] Using this device, high-temperature pipe sealing can be achieved, effectively controlling the internal pressure and reducing the risks of high-temperature operations. The "high temperature" mentioned in this invention refers to a maximum temperature of 350℃.
[0037] In summary, the method of the embodiments of this utility model has been clearly described. With reference to the detailed illustration and description of the present invention with reference to the embodiments thereof, those skilled in the art will understand that various modifications in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims
1. A high-temperature fixed-point sealing device, characterized in that, Includes a working cylinder, and a sealing body disposed within the working cylinder and anchored thereto. The sealing body includes a main body, an anchoring mechanism, a sealing body threadedly connected to the main body, a combined seal disposed on the sealing body, and a weighting rod threadedly connected to the sealing body. The anchoring mechanism includes two symmetrical locking blocks fixed to the main body by a pivot pin, and a torsion spring disposed in the locking blocks. The working cylinder is designed with an anchoring groove, a limiting step, and a sealing surface. The locking block is anchored in the anchoring groove. The combined seal and the sealing surface form a high-temperature seal. The limiting step prevents the sealing body from moving downward in the working cylinder.
2. The high-temperature fixed-point sealing device according to claim 1, characterized in that, The combined seal consists of a spacer ring and a high-temperature sealing ring.
3. The high-temperature fixed-point sealing device according to claim 1, characterized in that, The weighting rod is a solid cylindrical metal body with a diameter of 32mm and a length of 1m.