High-temperature-resistant plug-in well control emergency rescue tool

Abstract

The invention discloses a high-temperature-resistant plug-in type well control emergency rescue tool which comprises a guide cone head, a first length-adjusting sleeve pup joint, a first-stage sealing body, a second length-adjusting sleeve pup joint, a second-stage sealing body and an upper connector which are sequentially connected through screw threads. The guide cone head comprises a guide cone joint, one end of the guide cone joint is provided with an internal thread, the other end of the guide cone joint is provided with a conical surface and a guide cone inclined tip, and a primary overflowing hole and a secondary overflowing hole are respectively formed around the conical surface of the guide cone joint. The device plays a crucial role in emergency rescue of wells with fractured oil well casings and imperfect well mouths; tie-back of a well mouth can be achieved, and a proper throttling well killing channel can be provided for well killing in the next step. The tool has a wide application prospect in the future emergency rescue treatment process.

Description

Technical Field

[0001] This invention relates to the field of well control emergency rescue technology for downhole operations in oil and gas field development, and particularly to a high-temperature resistant insertable well control emergency rescue tool. Background Technology

[0002] As oilfield development enters its mid-to-late stages, various development methods such as waterflooding, steam flooding, fire flooding, SAGD, carbon dioxide flooding, and chemical flooding are widely used. However, factors such as high temperature, high pressure, and high sulfur content can cause casing damage and fractures, leading to blowouts or even uncontrolled blowouts. Currently, under extreme conditions where a blowout results in an incomplete wellhead, wellhead reconstruction is difficult, carries high safety risks, and has a low success rate. Furthermore, conventional well control techniques heavily rely on wellhead equipment, making effective choke control impossible when the wellhead is incomplete. Currently, most wellhead reconstruction tools are designed for conditions where the oil and casing are intact; there are no specialized tools for incomplete wellheads, making rescue operations extremely difficult. To effectively address these issues, there is an urgent need to develop a well control emergency rescue tool to cope with wellhead reconstruction work under extremely harsh conditions.

[0003] A search revealed a Chinese patent with publication number CN201280908Y, entitled "Double-Sealed Blowout Preventer for Wellhead Logging." Its application scenario is wellhead sealing during logging in oil and water wells. The core structure includes an upper pressure cap, a secondary sealing body, a conical sealing packing, an overflow port, a flow-blocking pipe, and an instrument catcher. It uses a double-stage conical sealing packing to achieve sealing, primarily addressing wellhead overflow contamination and instrument fall-in-the-well issues during logging. Compared to this invention, the application scenarios are completely different (logging operations vs. well control emergency rescue), and the structural composition differs significantly (the core components of this invention, such as the guide cone, adjustable casing short-connector, and metal-rubber combined double-stage sealing body, have no corresponding structures in the prior art). Furthermore, the high-temperature resistant design, insert-type wellhead reconnection function, and flow-through hole design to reduce throttling force of this invention are not mentioned in the prior art, indicating no overlap in technical solutions. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a high-temperature resistant insertable well control emergency rescue tool, which effectively solves the problem of wellhead reconstruction for wells with imperfect wellheads. It has a simple structure and ingenious design, enabling both wellhead casing re-insertion and a certain degree of sealing performance, achieving throttling and well control, and is suitable for widespread use in well workover operations.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a high-temperature resistant insertable well control emergency rescue tool, comprising a guide cone head, an adjustable casing short connector one, a primary sealing body, an adjustable casing short connector two, a secondary sealing body, and an upper connector connected in sequence by threads; the guide cone head includes a guide cone connector, one end of which has an internal thread, and the other end has a tapered surface and a guide cone tip, and a primary flow hole and a secondary flow hole are respectively opened around the tapered surface of the guide cone connector.

[0006] Furthermore, the primary and secondary flow holes are arranged in a stepped manner.

[0007] Furthermore, the flow area of ​​the guide cone is consistent with the cross-sectional area inside the oil well casing.

[0008] Furthermore, the primary sealing body includes a sealing body, a sealing joint, a metal sealing body, and a rubber sealing body; the lower end of the sealing joint is connected to the adjusting sleeve short-circuit 1 by a thread, and the upper end is connected to the lower end of the sealing body 1 by a thread; the metal sealing body 1 is nested between the sealing joint 1 and the sealing body 1; and the rubber sealing body 1 is disposed on the sealing body 1.

[0009] Furthermore, the outer diameter of the metal sealing body is smaller than the inner diameter of the oil well casing.

[0010] Furthermore, the rubber seal is applied to the sealing body by vulcanization.

[0011] Furthermore, the outer diameter of the rubber seal is smaller than the inner diameter of the well casing, but larger than the outer diameter of the metal seal.

[0012] Furthermore, the secondary sealing body includes a second sealing body, a second sealing joint, a second metal sealing body, and a second rubber sealing body; the lower end of the second sealing joint is connected to the second short-circuit of the adjusting sleeve by a thread, and the upper end is connected to the lower end of the second sealing body by a thread; the second metal sealing body is nested between the second sealing joint and the second sealing body; and the second rubber sealing body is disposed on the second sealing body.

[0013] Furthermore, the outer diameter of the second metal seal is smaller than the inner diameter of the well casing, but larger than the outer diameter of the first metal seal.

[0014] Furthermore, the second rubber seal is applied to the second seal body through vulcanization.

[0015] Furthermore, the outer diameter of rubber seal body two is larger than the inner diameter of the oil well casing and larger than the outer diameter of rubber seal body one.

[0016] This invention plays a crucial role in emergency rescue of wells with broken casing or imperfect wellheads; it can both reconnect the wellhead and provide a suitable choke and kill channel for subsequent well control; this tool has broad application prospects in future emergency rescue and disposal processes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a schematic diagram of the guide cone head structure; Figure 4 This is a schematic diagram of the primary sealing structure; Figure 5 This is a schematic diagram of a two-stage sealing structure.

[0018] The components are: 1. Guide cone head; 2. Adjustable sleeve short connector one; 3. Primary sealing body; 4. Adjustable sleeve short connector two; 5. Secondary sealing body; 6. Upper connector; 7. Guide cone bevel; 8. Primary flow hole; 9. Secondary flow hole; 10. Guide cone connector; 11. Sealing connector one; 12. Metal sealing body one; 13. Rubber sealing body one; 14. Sealing connector two; 15. Metal sealing body two; 16. Rubber sealing body two. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-5 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0021] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only for distinction and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1 A high-temperature resistant insertable well control emergency rescue tool includes a guide cone head 1, an adjustable casing short connector 1 2, a primary sealing body 3, an adjustable casing short connector 2 4, a secondary sealing body 5, and an upper connector 6 connected sequentially by threads. The guide cone head 1 includes a guide cone connector 10, one end of which has an internal thread, and the other end has a tapered surface and a guide cone tip 7. A primary flow hole 8 and a secondary flow hole 9 are respectively opened around the tapered surface of the guide cone connector 10.

[0024] When using the tool, a counterweight blowout preventer (BOP) assembly is required. The weight of the counterweight BOP assembly is related to the casing inner diameter, the cross-sectional area of ​​the guide cone 1, and the wellhead pressure. The counterweight weight should include a certain safety factor based on the calculated jacking force. Simultaneously, the BOP assembly should be secured at all four corners with tension ropes to prevent the rescue tool from being pushed up. When using the guide cone 1, because the front cross-sectional area of ​​the guide cone tip 7 is small, it is easy to insert into the wellhead, thus serving as an introduction tool.

[0025] Example 2 A high-temperature resistant insertable well control emergency rescue tool includes a guide cone head 1, an adjustable casing short connector 1 2, a primary sealing body 3, an adjustable casing short connector 2 4, a secondary sealing body 5, and an upper connector 6, which are connected in sequence by threaded connections.

[0026] The guide cone head 1 includes a guide cone connector 10. One end of the guide cone connector 10 has an internal thread, and the other end has a tapered surface and a guide cone tip 7. A primary flow passage 8 and a secondary flow passage 9 are respectively opened around the tapered surface of the guide cone connector 10. The primary flow passage 8 and the secondary flow passage 9 are arranged in a stepped manner. The flow area of ​​the guide cone head 1 is consistent with the cross-sectional area of ​​the short-circuit of the adjusting sleeve 1, which reduces the upward force caused by the throttling effect.

[0027] The primary sealing body 3 includes a sealing body 1, a sealing joint 11, a metal sealing body 12, and a rubber sealing body 13. The lower end of the sealing joint 11 is connected to the adjusting casing short-circuit 2 via a threaded connection, and the upper end is connected to the lower end of the sealing body 1 via a threaded connection. The metal sealing body 12 is nested between the sealing joint 11 and the sealing body 1. The rubber sealing body 13 is vulcanized and installed on the sealing body 1. The outer diameter of the metal sealing body 12 is smaller than the inner diameter of the oil well casing. The outer diameter of the rubber sealing body 13 is smaller than the inner diameter of the oil well casing but larger than the outer diameter of the metal sealing body 12.

[0028] The secondary sealing body 5 includes a second sealing body, a second sealing joint 14, a second metal sealing body 15, and a second rubber sealing body 16. The lower end of the second sealing joint 14 is connected to the second short-connector 4 of the adjusting casing via threads, and the upper end is connected to the lower end of the second sealing body via threads. The second metal sealing body 15 is nested between the second sealing joint 14 and the second sealing body. The second rubber sealing body 16 is vulcanized and installed on the second sealing body. The outer diameter of the second metal sealing body 15 is smaller than the inner diameter of the oil well casing and larger than the outer diameter of the first metal sealing body 12. The outer diameter of the second rubber sealing body 16 is larger than the inner diameter of the oil well casing and larger than the outer diameter of the first rubber sealing body 13.

[0029] This tool features an ingenious design that challenges conventional thinking. Traditional well control techniques heavily rely on wellhead equipment, making effective choke control impossible when the wellhead is imperfect. This tool, by internally sealing the casing in the oil reservoir, effectively solves the well control problem caused by wellhead imperfections leading to wellhead loss of control. The device has a simple structure, enabling both wellhead casing re-insertion and a certain degree of sealing performance, allowing for choke control operations after re-insertion.

[0030] This effectively solves the problem of inserting the tool. Based on the relationship between the outer diameters of the oil layer casing and the surface casing, the outer diameter and guide cone angle of the lower guide cone 1 are determined to ensure that the oil layer casing can be smoothly introduced without adjusting the angle or orientation.

[0031] To address the issue of throttling and pipe string bulging, the lower guide cone 1 features a conical, hollow design. The flow area of ​​guide cone 1 is consistent with the cross-sectional area inside the oil well casing, reducing the throttling effect and alleviating the pipe string bulging problem.

[0032] Solving the sealing problem. The rescue tool uses two types of seals: a metal seal located below the rubber seal, protecting it from high-temperature, high-pressure fluid ejection that could puncture the vulcanized rubber and affect the seal; and a metal seal achieved by inserting the tool into the oil layer casing and compressing it, thus completing the throttling and well-killing operation.

[0033] Solve the problem of sealing different sleeve sizes. The guide cone, sealing body, and adjustable sleeve short connector are all detachable. Before construction, the tool structure can be designed specifically according to the inner diameter of the sleeve and the depth of the fish head, and the sealing body level can be adjusted, making it highly adaptable.

[0034] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims. Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-temperature resistant insertable well control emergency rescue tool, characterized in that, It includes a guide cone head (1), an adjusting sleeve short connector one (2), a primary sealing body (3), an adjusting sleeve short connector two (4), a secondary sealing body (5), and an upper connector (6) connected in sequence by threaded connection; the guide cone head (1) includes a guide cone connector (10), one end of the guide cone connector (10) is provided with an internal thread, the other end is provided with a tapered surface and a guide cone tip (7), and a primary flow hole (8) and a secondary flow hole (9) are respectively provided around the tapered surface of the guide cone connector (10).

2. The high-temperature resistant insertable well control emergency rescue tool according to claim 1, characterized in that, The primary flow passage (8) and the secondary flow passage (9) are arranged in a stepped manner.

3. The high-temperature resistant insertable well control emergency rescue tool according to claim 1, characterized in that, The flow area of ​​the guide cone (1) is consistent with the cross-sectional area inside the oil well casing.

4. The high-temperature resistant insertable well control emergency rescue tool according to claim 1, characterized in that, The first-level sealing body (3) includes a sealing body, a sealing joint (11), a metal sealing body (12), and a rubber sealing body (13). The lower end of the sealing joint (11) is connected to the adjusting sleeve short-circuit (2) by a thread, and the upper end is connected to the lower end of the sealing body by a thread. The metal sealing body (12) is nested between the sealing joint (11) and the sealing body. The rubber sealing body (13) is set on the sealing body.

5. The high-temperature resistant insertable well control emergency rescue tool according to claim 4, characterized in that, The outer diameter of the metal sealing body (12) is smaller than the inner diameter of the well casing.

6. The high-temperature resistant insertable well control emergency rescue tool according to claim 4, characterized in that, The rubber seal (13) is vulcanized and set on the sealing body.

7. The high-temperature resistant insertable well control emergency rescue tool according to claim 4, characterized in that, The outer diameter of the rubber seal body (13) is smaller than the inner diameter of the well casing and larger than the outer diameter of the metal seal body (12).

8. The high-temperature resistant insertable well control emergency rescue tool according to claim 4, characterized in that, The secondary sealing body (5) includes a second sealing body, a second sealing joint (14), a second metal sealing body (15), and a second rubber sealing body (16). The lower end of the second sealing joint (14) is connected to the second short-circuit of the lengthening sleeve (4) by a thread, and the upper end is connected to the lower end of the second sealing body by a thread. The second metal sealing body (15) is nested between the second sealing joint (14) and the second sealing body, and the second rubber sealing body (16) is set on the second sealing body.

9. The high-temperature resistant insertable well control emergency rescue tool according to claim 8, characterized in that, The outer diameter of the second metal seal (15) is smaller than the inner diameter of the well casing and larger than the outer diameter of the first metal seal (12).

10. The high-temperature resistant insertable well control emergency rescue tool according to claim 8, characterized in that, The rubber seal body 2 (16) is vulcanized and set on the seal body 2.

11. The high-temperature resistant insertable well control emergency rescue tool according to claim 8, characterized in that, The outer diameter of the second rubber seal (16) is greater than the inner diameter of the well casing and greater than the outer diameter of the first rubber seal (13).

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