Degradable multipurpose fixed ball seat
By designing a degradable multi-purpose fixed ball mount, the soluble fixed ball mount is used to degrade in the well fluid to form a large diameter, which solves the problem of diameter reduction in the prior art, and achieves the guarantee of later equipment re-entry and oil and gas production.
Patent Information
- Application Number
- CN202422109783.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The existing fixed ball seats are reduced due to the internal shrinkage of the internal diameter during operation, which cannot meet the full diameter of the wellbore, and thus cannot meet the large channels for later equipment re-entry and guarantee oil and gas production.
A degradable multi-purpose fixed ball mount is designed, using a soluble fixed ball mount with a sealing groove and a sealing ring on the surface. After the isolation layer is broken, the soluble fixed ball mount contacts the well fluid and gradually degrades, forming a large diameter.
Through degradation, large diameters are formed to meet the re-entry of later equipment and ensure oil and gas production. After degradation, the entire pipe column has no shrinkage diameter, ensuring the smooth entry of later operations.
Smart Images
Figure CN222991462U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil and gas well exploitation, and more specifically, to a degradable multi-purpose fixed ball seat. Background Art
[0002] Oil and gas wells are important facilities connecting underground oil and gas resources with the ground. They are an essential key link in the process of oil and gas development. The engineering of oil and gas wells is a complex and professional field, covering multiple aspects such as exploration, drilling, measurement and testing, and protection and repair. Each step requires precise technology and a large amount of capital investment. To maintain the full bore of the wellbore, a degradable multi-purpose fixed ball seat is needed.
[0003] The existing fixed ball seat is a single working barrel. When the working barrel is working, the inside of the working barrel realizes overall reduced diameter so that the ball and the plug can be sealed. The structure is simple. However, the overall reduced diameter inside the working barrel results in a smaller cross-sectional area of the through diameter, which cannot meet the full bore of the wellbore, and thus cannot meet the re-entry of subsequent equipment and ensure a large channel for oil and gas production. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a degradable multi-purpose fixed ball seat to solve the problems raised in the above background art:
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] A degradable multi-purpose fixed ball seat includes an upper joint and a lower joint that matches it. The upper joint is threadedly connected to the lower joint. A soluble fixed ball seat is arranged between the upper joint and the lower joint. The surface of the soluble fixed ball seat is provided with a first sealing groove, and a first sealing ring is installed inside the first sealing groove. Both ends of the surface of the soluble fixed ball seat are provided with second sealing grooves, and second sealing rings are installed inside both of the second sealing grooves. An isolation layer is arranged on both the inner surface and the outer surface at one end of the soluble fixed ball seat. An isolation layer is arranged on the surface at one end of the soluble fixed ball seat. A soluble ball for sealing is arranged inside the soluble fixed ball seat.
[0007] By adopting the above technical solutions, after the pressure rises to the pressure at which the isolation layer breaks, the upper pressure is removed. The degradable material of the soluble fixed ball seat comes into contact with the well fluid and begins to gradually degrade. When the soluble fixed ball seat is completely degraded, the remaining residues after degradation can be discharged back to the ground through the well fluid. The soluble fixed ball seat dissolves to form a large through diameter, thereby meeting the re-entry of subsequent equipment and ensuring oil and gas production. After degradation, the entire pipe string has no reduced diameter, ensuring the smooth entry of subsequent operations.
[0008] Preferably, a third sealing groove is formed on the outer surface of the upper joint, and a third sealing ring and a sealing ring retainer are respectively arranged inside the third sealing groove, and the sealing ring retainer is located on one side of the third sealing ring.
[0009] By adopting the above technical solution, the function of the sealing ring retainer is to enhance the sealing effect of the third sealing ring.
[0010] Preferably, the upper joint forms a seal with the smooth surface of the lower joint through the cooperation of the third sealing ring and the sealing ring retainer.
[0011] Preferably, the first sealing ring contacts the smooth sealing surface inside the lower joint, and the soluble fixed ball seat is sealed with the lower joint through the first sealing ring.
[0012] Preferably, the second sealing ring is installed inside the second sealing groove where the two ends of the soluble fixed ball seat are combined with the isolation layer, and contacts and forms a seal with the smooth sealing surfaces inside the upper joint and the lower joint.
[0013] Preferably, an anti-rotation screw for preventing the upper joint and the lower joint from loosening is arranged on the surface of the lower joint.
[0014] By adopting the above technical solution, the function of the anti-rotation screw is to prevent the upper joint and the lower joint from loosening.
[0015] Preferably, a plurality of first through grooves are formed on one end surface of the soluble fixed ball seat, and a second through groove communicating with the first through grooves is formed on the side surface of the soluble fixed ball seat.
[0016] By adopting the above technical solution, after the isolation layer ruptures, the well fluid not only contacts and dissolves with the contact surface of the soluble fixed ball seat, but also enters the first through groove and the second through groove respectively, increasing the dissolution area of the well fluid and the soluble fixed ball seat, accelerating the dissolution speed of the soluble fixed ball seat, and thus improving the working efficiency.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0018] 1) When the biodegradable multi-purpose fixed ball seat is in use, the soluble fixed ball seat is sealed with the lower sub by the first sealing ring. The second sealing ring is installed inside the second sealing groove where the two ends of the soluble fixed ball seat are combined with the isolation layer, and contacts and forms a seal with the smooth sealing surfaces inside the upper sub and the lower sub, achieving a plugging effect. Pressurize the upper space of the soluble fixed ball seat. When the pressure rises to the pressure at which the isolation layer ruptures, remove the upper pressure. The biodegradable material of the soluble fixed ball seat comes into contact with the well fluid and begins to gradually degrade. After the soluble fixed ball seat is completely degraded, the remaining residue can be discharged back to the surface through the well fluid. The soluble fixed ball seat dissolves to form a large-diameter passage, thus meeting the re-entry of later equipment and ensuring oil and gas production. After degradation, the entire pipe string has no diameter reduction, ensuring the smooth entry of later operations.
[0019] 2) When the biodegradable multi-purpose fixed ball seat is in use, after the isolation layer ruptures, the well fluid not only contacts and dissolves with the contact surface of the soluble fixed ball seat, but also enters the first through groove and the second through groove respectively, increasing the dissolution area of the well fluid and the soluble fixed ball seat, accelerating the dissolution speed of the soluble fixed ball seat, and thus improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic cross-sectional structure diagram of the soluble fixed ball seat of the present utility model;
[0021] Figure 2 It is a schematic structure diagram of the upper sub of the present utility model;
[0022] Figure 3 It is a schematic overall structure diagram of the soluble fixed ball seat of the present utility model;
[0023] Figure 4 It is a schematic structure diagram of the sealing ring retaining ring of the present utility model;
[0024] Figure 5 It is a schematic structure diagram of the isolation layer of the present utility model;
[0025] Figure 6 It is a schematic internal structure diagram of the upper sub and the lower sub of the present utility model.
[0026] Explanation of the reference numerals in the drawings: 1. Upper sub; 2. Lower sub; 3. Soluble fixed ball seat; 4. First sealing groove; 5. First sealing ring; 6. Second sealing groove; 7. Second sealing ring; 8. Isolation layer; 9. Soluble ball; 10. Third sealing groove; 11. Third sealing ring; 12. Sealing ring retaining ring; 13. Anti-rotation screw; 14. First through groove; 15. Second through groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] Embodiment 1
[0028] Please refer to Figures 1 to 6, A degradable multi-purpose fixed ball seat, including an upper sub 1 and a lower sub 2 that matches it. The upper sub 1 is threadedly connected to the lower sub 2. A soluble fixed ball seat 3 is arranged between the upper sub 1 and the lower sub 2. The soluble fixed ball seat 3 is made of a degradable material. A first sealing groove 4 is provided on the surface of the soluble fixed ball seat 3, and a first sealing ring 5 is installed inside the first sealing groove 4. Second sealing grooves 6 are provided on the surfaces at both ends of the soluble fixed ball seat 3, and second sealing rings 7 are installed inside both second sealing grooves 6. An isolation layer 8 is provided on both the inner surface and the outer surface at one end of the soluble fixed ball seat 3. An isolation layer 8 is provided on the surface at one end of the soluble fixed ball seat 3. The isolation layer 8 can select isolation layers 8 of different materials according to the application environment, and the strength of the isolation layer 8 needs to be tested to meet the working conditions. A soluble ball 9 for sealing is arranged inside the soluble fixed ball seat 3. The soluble fixed ball seat 3 is sealed with the lower sub 2 through the first sealing ring 5. The second sealing ring 7 is installed inside the second sealing groove 6 where the two ends of the soluble fixed ball seat 3 are combined with the isolation layer 8, and contacts the smooth sealing surfaces inside the upper sub 1 and the lower sub 2 to form a seal, playing a plugging effect. Pressurize the upper space of the soluble fixed ball seat 3. When the pressure rises to the pressure at which the isolation layer 8 ruptures, remove the upper pressure. The degradable material of the soluble fixed ball seat 3 comes into contact with the well fluid and begins to gradually degrade. When the soluble fixed ball seat 3 is completely degraded, the remaining residue after degradation can be returned to the ground through the well fluid. The soluble fixed ball seat 3 dissolves to form a large through-hole diameter, thereby meeting the re-entry of later equipment and ensuring oil and gas production. After degradation, the entire pipe string has no diameter reduction, ensuring the smooth entry of later operations.
[0029] A third sealing groove 10 is provided on the outer surface of the upper sub 1, and a third sealing ring 11 and a sealing ring retaining ring 12 are respectively arranged inside the third sealing groove 10. The sealing ring retaining ring 12 is located on one side of the third sealing ring 11.
[0030] The upper sub 1 forms a seal with the smooth surface of the lower sub 2 through the mutual cooperation of the third sealing ring 11 and the sealing ring retaining ring 12. The function of the sealing ring retaining ring 12 is to increase the sealing effect of the third sealing ring 11.
[0031] The first sealing ring 5 contacts the smooth sealing surface inside the lower sub 2, and the soluble fixed ball seat 3 is sealed with the lower sub 2 through the first sealing ring 5.
[0032] The second sealing ring 7 is installed inside the second sealing groove 6 where the two ends of the soluble fixed ball seat 3 are combined with the isolation layer 8, and contacts the smooth sealing surfaces inside the upper sub 1 and the lower sub 2 to form a seal.
[0033] An anti-rotation screw 13 for preventing the upper sub 1 and the lower sub 2 from loosening is provided on the surface of the lower sub 2. The function of the anti-rotation screw 13 is to prevent the upper sub 1 and the lower sub 2 from loosening.
[0034] The utility model uses the following steps: when using the degradable multi-purpose fixed ball seat, first lower the soluble fixed ball seat 3 into the appropriate upper joint 1 and lower joint 2 casings, and smoothly lower it to the designated position underground, completing all preparations before activation, and lowering the internal soluble ball 9 to the internal sealing step of the soluble fixed ball seat 3 through a rope operation. The soluble fixed ball seat 3 is sealed with the lower joint 2 through a first sealing ring 5, and the second sealing ring 7 is installed in the second sealing groove 6 combined with the isolation layer 8 at both ends of the soluble fixed ball seat 3, and contacts and forms a seal with the smooth sealing surface inside the upper joint 1 and the lower joint 2, thereby achieving a plugging effect, and pressurizing the upper space of the soluble fixed ball seat 3. When the pressure rises to the pressure at which the isolation layer 8 ruptures, the upper pressure is removed, and the degradable material of the soluble fixed ball seat 3 can contact the well fluid through the gap in the damaged isolation layer 8 and begin to gradually degrade. 3 is completely degraded, and the remaining residue after degradation can be returned to the ground through the well fluid. Finally, the soluble fixed ball seat 3 part forms a diameter. In this scheme, the soluble fixed ball seat 3 is sealed with the lower joint 2 through the first sealing ring 5. The second sealing ring 7 is installed in the second sealing groove 6 combined with the isolation layer 8 at both ends of the soluble fixed ball seat 3, and contacts with the smooth sealing surface inside the upper joint 1 and the lower joint 2 to form a seal, which has a plugging effect. Pressurize the upper space of the soluble fixed ball seat 3. When the pressure rises to the pressure at which the isolation layer 8 ruptures, remove the upper pressure, and the degradable material of the soluble fixed ball seat 3 contacts the well fluid and begins to gradually degrade. When the soluble fixed ball seat 3 is completely degraded, the remaining residue after degradation can be returned to the ground through the well fluid. The soluble fixed ball seat 3 dissolves to form a large diameter, thereby meeting the re-entry of the later equipment and ensuring the oil and gas production. After degradation, the entire pipe string has no shrinkage, ensuring the smooth entry of the later operation.
[0035] Example 2
[0036] See also Figures 1 to 6 The difference between the combined implementation basis is that a plurality of first through grooves 14 are provided on one end surface of the soluble fixed ball seat 3, and a second through groove 15 connected to the first through groove 14 is provided on the side surface of the soluble fixed ball seat 3. After the isolation layer 8 is broken, the well fluid not only contacts and dissolves with the contact surface of the soluble fixed ball seat 3, but also enters the first through groove 14 and the second through groove 15 respectively, thereby increasing the dissolution area of the well fluid and the soluble fixed ball seat 3, accelerating the dissolution speed of the soluble fixed ball seat 3, and thus improving the work efficiency.
[0037] The utility model uses steps: when the degradable multi-purpose fixed ball seat is in use, after the isolation layer 8 is broken, the well fluid not only contacts and dissolves with the contact surface of the soluble fixed ball seat 3, but also enters the first through groove 14 and the second through groove 15 respectively, thereby increasing the dissolution area of the well fluid and the soluble fixed ball seat 3, accelerating the dissolution speed of the soluble fixed ball seat 3, and thus improving the work efficiency.
[0038] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present utility model, and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A degradable multi-purpose fixed ball seat, comprising an upper joint (1) and a matching lower joint (2), wherein the upper joint (1) and the lower joint (2) are threadedly connected, characterized in that: A soluble fixed ball seat (3) is arranged between the upper joint (1) and the lower joint (2); a first sealing groove (4) is provided on the surface of the soluble fixed ball seat (3); a first sealing ring (5) is installed inside the first sealing groove (4); second sealing grooves (6) are provided on both end surfaces of the soluble fixed ball seat (3); second sealing rings (7) are installed inside the two second sealing grooves (6); an isolation layer (8) is provided on the inner and outer surfaces of one end of the soluble fixed ball seat (3); an isolation layer (8) is provided on one end surface of the soluble fixed ball seat (3); and a soluble ball (9) for sealing is provided inside the soluble fixed ball seat (3).
2. The degradable multi-purpose fixed ball seat according to claim 1, characterized in that: The outer surface of the upper joint (1) is provided with a third sealing groove (10), and the interior of the third sealing groove (10) is provided with a third sealing ring (11) and a sealing ring retaining ring (12), and the sealing ring retaining ring (12) is located on one side of the third sealing ring (11).
3. The degradable multi-purpose fixed ball seat according to claim 2, characterized in that: The upper joint (1) forms a seal with the smooth surface of the lower joint (2) by cooperating with the third sealing ring (11) and the sealing ring retaining ring (12).
4. The degradable multi-purpose fixed ball seat according to claim 1, characterized in that: The first sealing ring (5) contacts the smooth sealing surface inside the lower joint (2), and the soluble fixed ball seat (3) is sealed with the lower joint (2) through the first sealing ring (5).
5. The degradable multi-purpose fixed ball seat according to claim 1, characterized in that: The second sealing ring (7) is installed inside the second sealing groove (6) connected to the isolation layer (8) at both ends of the soluble fixed ball seat (3), and contacts the smooth sealing surface inside the upper joint (1) and the lower joint (2) to form a seal.
6. The degradable multi-purpose fixed ball seat according to claim 1, characterized in that: The surface of the lower joint (2) is provided with an anti-rotation screw (13) for preventing the upper joint (1) and the lower joint (2) from loosening.
7. The degradable multi-purpose fixed ball seat according to claim 1, characterized in that: A plurality of first through grooves (14) are formed on one end surface of the soluble fixed ball seat (3), and a second through groove (15) communicating with the first through grooves (14) is formed on the side surface of the soluble fixed ball seat (3).