Rapid pressure testing and injection of short sections in coiled tubing

Abstract

This application provides a rapid pressure testing injection sub for coiled tubing, relating to the field of pressure testing technology. The rapid pressure testing injection sub for coiled tubing includes: a tubing body, which is annular in structure and has a through hole along its axial direction for accommodating the coiled tubing; a sealing device at a first end of the tubing body forming a sealing space; and a first opening on the outer wall of the tubing body; a flow pipe disposed within the annular structure, the flow pipe having a flow channel, one end of the flow pipe communicating with the first opening, and the second end communicating with the sealing space.

Description

Technical Field

[0001] This application relates to the field of pressure testing technology, and in particular to a rapid pressure testing injection short section for continuous tubing. Background Technology

[0002] Currently, during pressure testing, water can be injected into the coiled tubing using a surface pump truck. The water flows out from the front end of the coiled tubing and enters the annular space between the coiled tubing and the blowout preventer (BOP), thus completing the overall pressure test. However, when replacing downhole tools, the connection between the BOP and BOP must be removed to expose the downhole tools, allowing for tool replacement. Then, the BOP and BOP are reconnected, and the connection between the newly installed BOP and BOP is pressure tested. However, if the downhole tools are specialized and water injection is not permitted, wellhead pressure testing may not be possible.

[0003] Therefore, how to provide a non-water-injection-based pressure testing method has become an urgent technical problem to be solved. Utility Model Content

[0004] This application provides a rapid pressure testing injection short section for coiled tubing, the technical solution of which is as follows:

[0005] To solve the above-mentioned technical problems, this application provides a continuous tubing rapid pressure testing injection short section.

[0006] The present application provides a coiled tubing rapid pressure testing injection sub-section, comprising:

[0007] The tube body has an annular structure and has a through hole along the axial direction for accommodating a continuous tubing.

[0008] The first end of the tube has a sealing device, which forms a sealed space, and the outer wall of the tube has a first opening; a flow tube is provided inside the annular structure, which has a flow channel, one end of which is connected to the first opening and the second end of which is connected to the sealed space.

[0009] In this embodiment of the application, the first end of the tube has an annular groove, the groove extends to a predetermined depth in a direction parallel to the axial direction, the groove extends to a predetermined thickness in a direction perpendicular to the axial direction, the predetermined thickness is less than the thickness of the annular structure, and the sealing device is provided in the groove.

[0010] In this embodiment of the application, the sealing device includes two sealing rings spaced apart along the depth direction of the groove, the two sealing rings forming a sealing space, and the second end of the flow pipe communicating with the side wall of the groove between the two sealing rings.

[0011] In this embodiment of the application, it also includes:

[0012] The first valve is located at the first opening.

[0013] In this embodiment of the application, a second opening is also provided on the outer wall, and the second opening communicates with the through hole.

[0014] In this embodiment of the application, it also includes:

[0015] The second valve is located at the second opening.

[0016] In this embodiment, both the first valve and the second valve are one-way valves.

[0017] In this embodiment of the application, the first opening and the second opening are staggered on the outer wall of the tube.

[0018] In this embodiment, the flow tube extends in a direction parallel to the axial direction; or

[0019] The flow tube is bent.

[0020] Secondly, this application also provides a packer, including the coiled tubing rapid pressure test injection sub-section as described above;

[0021] Blowout preventer, wherein the first end of the rapid pressure test injection section of the coiled tubing is connected to the blowout preventer;

[0022] The blowout preventer is connected to the second end of the rapid pressure test injection sub-section of the continuous tubing.

[0023] A continuous tubing, which extends sequentially into the blowout preventer, the continuous tubing rapid pressure injection sub, and the blowout preventer.

[0024] This application provides a coiled tubing rapid pressure testing injection short section. The short section is positioned between the blowout preventer (BOP) and the BOP pipe. The first end of the short section connects to the BOP, and the second end connects to the BOP pipe. After replacing downhole tools, the seal between the first end of the short section and the BOP needs to be tested. High-pressure water is introduced into the first opening. The high-pressure water enters the flow channel of the flow pipe through the first opening and then flows into the sealed space. If the sealing device can achieve a seal, the high-pressure water will remain within the sealed space and will not leak out; if the sealing device cannot achieve a seal, the high-pressure water will leak out of the sealed space. Therefore, by setting a flow pipe communicating with the sealed space within the annular structure of the coiled tubing rapid pressure testing injection short section, rapid pressure testing can be achieved, facilitating the verification of the integrity and seal of the connection between the BOP pipe and the BOP, while also ensuring the reliability of the packer.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A cross-sectional view of the coiled tubing rapid pressure test injection sub-section provided in this application;

[0028] Figure 2 A schematic diagram of the coiled tubing rapid pressure test injection short section provided in this application;

[0029] Figure 3 A schematic diagram of the packer provided in this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Coiled tubing rapid pressure test injection sub; 11. Tube body; 12. Through hole; 13. Sealing device; 131. Sealing space; 132. Sealing ring; 14. First opening; 15. Flow pipe; 16. Tank; 17. First valve; 18. Second opening; 19. Second valve; 20. Fluid ejection hole; 2. Blowout preventer; 3. Blowout preventer pipe; 4. Coiled tubing; 5. Downhole tools; 100. Packer. Detailed Implementation

[0032] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0033] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0034] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0036] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0037] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0038] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0039] like Figure 1 and Figure 2 As shown, this application provides a coiled tubing rapid pressure testing injection section 1, comprising:

[0040] The pipe body 11 has an annular structure and has a through hole 12 along the axial direction for accommodating the continuous oil pipe 4;

[0041] The first end of the tube body 11 has a sealing device 13, which forms a sealing space 131. The outer wall of the tube body 11 has a first opening 14. The annular structure has a flow tube 15, which has a flow channel. The first end of the flow tube 15 is connected to the first opening 14, and the second end is connected to the sealing space 131.

[0042] In this embodiment, the tube body 11 can be a columnar structure. A through hole 12 extends axially from the center of the bottom surface of the columnar tube body 11, penetrating the tube body 11 structure axially. The continuous tubing 4 can pass through the through hole 12. The tube body 11 can be made of metal or plastic, meeting the requirements for resistance to hydrogen sulfide corrosion, or other materials, as long as it is suitable for production and application. A pipe capable of accommodating a flow pipe 15 is provided at the annular structure of the tube body 11, allowing the flow pipe 15 to be placed inside the annular structure of the tube body 11. One end of the flow pipe 15 is connected to the first opening 14, and the other end is welded to the inside of the first end of the tube body 11. A second end is located between the first and second ends, connected to the sealing device 13 via a bent section of the tube body 11. The flow pipe 15 can be made of metal, plastic, or other materials, as long as it is suitable for production and application. The rated working pressure of the flow pipe 15 is 10000 Psi.

[0043] In this embodiment, the pipe body 11 has a first end and a second end along the axial direction. The first end is used to connect to the blowout preventer 2, and the second end is used to connect to the blowout preventer pipe 3. The first end of the pipe body 11 is provided with a sealing device 13. When the first end of the continuous tubing is connected to the blowout preventer 2 during rapid pressure testing, the pipe body 11 and the sealing device 13 can be sealed if the sealing effect of the sealing device 13 is good.

[0044] In this embodiment, the sealing device 13 forms a sealing space 131, which is a space that can contain a medium, such as air or a solution such as water.

[0045] In this embodiment, the pipe body 11 is an annular structure with an outer wall and an inner wall. The inner wall is in contact with the continuous oil pipe 4, and the outer wall is located on the outside. A first opening 14 is provided on the outer wall of the pipe body 11. A flow pipe 15 is provided inside the annular structure. The first end of the flow pipe 15 is connected to the first opening 14, and the second end is connected to the sealing space 131.

[0046] This application provides a coiled tubing rapid pressure testing injection section 1, which is installed between the blowout preventer 2 and the blowout preventer pipe 3. The first end of the coiled tubing rapid pressure testing injection section 1 is connected to the blowout preventer 2, and the second end is connected to the blowout preventer pipe 3. After replacing the downhole tool 5, it is necessary to test the seal between the first end of the coiled tubing rapid pressure testing injection section 1 and the blowout preventer 2. High-pressure water is introduced into the first opening 14. The high-pressure water enters the flow channel of the flow pipe 15 through the first opening 14, and then flows through the flow channel to the sealed space 131. If the sealing device 13 can achieve a seal, the high-pressure water will remain within the sealed space 131 and will not leak out; if the sealing device 13 cannot achieve a seal, the high-pressure water will leak out of the sealed space 131. Therefore, by setting a flow channel communicating with the sealed space 131 within the annular structure of the coiled tubing rapid pressure testing injection section 1, rapid pressure testing can be achieved, thus facilitating the verification of the integrity and seal of the connection between the blowout preventer pipe 3 and the blowout preventer 2.

[0047] like Figure 1 and Figure 2 As shown in the embodiment of this application, the first end of the tube 11 has an annular groove 16. The groove 16 extends to a predetermined depth in a direction parallel to the axial direction and extends to a predetermined thickness in a direction perpendicular to the axial direction. The predetermined thickness is less than the thickness of the annular structure. The sealing device 13 is provided inside the groove 16.

[0048] In this embodiment, the tube body 11 has a first end and a second end. The first end of the tube body 11 has an annular groove 16. The groove 16 extends to a predetermined depth in a direction parallel to the axial direction and extends to a predetermined thickness in a direction perpendicular to the axial direction. The groove 16 does not penetrate the annular structure in a direction perpendicular to the axial direction. Threads are provided on the side wall of the groove 16 so as to connect with the blowout preventer 2 by threads.

[0049] In this embodiment, a sealing device 13 is provided on the groove 16 at the first end of the pipe body 11, so that when the first end of the pipe body 11 is connected to the blowout preventer 2, the sealing device 13 can be used to seal the connection. After replacing the downhole tool 5 at the lower end of the blowout preventer 2, the pressure test between the blowout preventer 2 and the pipe body 11 can be performed by testing the sealing device 13. This pressure test method is quick and simple, eliminating the need to pump high-pressure water into the coiled tubing 4 for pressure testing, thereby improving construction efficiency. Furthermore, it allows for pressure testing of acidizing operations through the packer 100 in coiled tubing 4 where pressure testing cannot be performed by pumping liquid, ensuring its sealing performance.

[0050] like Figure 1 and Figure 2As shown in the embodiment of this application, the sealing device 13 includes two sealing rings 132 spaced apart along the depth direction of the groove 16, the two sealing rings 132 forming a sealing space 131, and the second end of the flow pipe 15 communicating with the side wall of the groove 16 between the two sealing rings 132.

[0051] In this embodiment, the sealing device 13 includes two spaced-apart sealing rings 132, forming a sealed space 131 between them. The first end of the flow pipe 15 is connected to the first opening 14, and the second opening 18 is connected to the side wall of the groove 16 between the two sealing rings 132. This allows high-pressure water supplied through the first opening 14 to be transferred through the flow channel of the flow pipe 15 into the sealed space 131 between the two sealing rings 132. If the sealing effect of the two sealing rings 132 is good, the high-pressure water will not leak upon entering the sealed space 131. If the sealing effect between the two sealing rings 132 is poor, the high-pressure water will leak upon entering the sealed space 131. Therefore, this configuration allows for quick and easy pressure testing of the connection between the blowout preventer 2 and the continuous tubing injection section 1.

[0052] like Figure 1 and Figure 2 As shown in the embodiments of this application, it also includes:

[0053] The first valve 17 is disposed within the first opening 14.

[0054] In this embodiment, a first valve 17 is provided inside the first opening 14, so that the opening and closing of the first opening 14 can be controlled. When it is necessary to transport high-pressure water, the first valve 17 is opened, and when it is not necessary to transport high-pressure water, the valve is closed, which can also prevent dust and other objects from entering the first opening 14.

[0055] In this embodiment of the application, a second opening 18 is also provided on the outer wall, and the second opening 18 communicates with the through hole 12.

[0056] In this embodiment, the outer wall of the pipe body 11 is also provided with a second opening 18, which is connected to the through hole 12 in the center of the pipe body 11. The coiled tubing 4 passes through the through hole 12, so that a desulfurizing agent or corrosion inhibitor can be sprayed onto the surface of the coiled tubing 4 through the second opening 18. The desulfurizing agent can slow down the corrosion of the coiled tubing 4 and extend its service life. The agent can be evenly applied to the surface of the coiled tubing 4, which can also reduce the amount of chemicals used. The corrosion inhibitor liquid is directly injected into the coiled tubing 4 through the second opening 18, so that the coiled tubing 4 is covered 360° when running into or out of the well, thereby maximizing the protection of the coiled tubing 4 and reducing the use of excessive chemicals.

[0057] like Figure 1 and Figure 2 As shown in the embodiments of this application, it also includes:

[0058] The second valve 19 is located at the second opening 18.

[0059] In this embodiment, a second valve 19 is provided in the second opening 18, so that the second valve 19 can be opened when it is necessary to spray desulfurizer or corrosion inhibitor, and closed when it is not necessary to spray desulfurizer or corrosion inhibitor into the continuous tubing 4. The second valve 19 can also prevent dust from entering the second opening 18, thereby preventing contamination of the desulfurizer or corrosion inhibitor.

[0060] In this embodiment, both the first valve 17 and the second valve 19 are one-way valves.

[0061] In this embodiment, the check valve allows fluid to flow only through the inlet, but prevents backflow of the medium through the outlet; it is commonly known as a one-way valve. A check valve is also called a non-return valve or a non-trailing valve. It is used in hydraulic systems to prevent reverse oil flow, or in pneumatic systems to prevent reverse compressed air flow. Check valves come in two types: straight-through and right-angle. Straight-through check valves are installed on pipelines using threaded connections. Right-angle check valves are available in three forms: threaded connection, plate connection, and flange connection.

[0062] In this embodiment, by providing one-way valves in both the first opening 14 and the second opening 18, high-pressure water can only enter the flow pipe 15 through the first valve 17 of the first opening 14, and will not be discharged from the first valve 17 of the first opening 14; desulfurizer or corrosion inhibitor can only enter the flow pipe 15 through the second valve 19 of the second opening 18, and will not be discharged from the second valve 19 of the second opening 18.

[0063] like Figure 1 and Figure 2 As shown in the embodiment of this application, the first opening 14 and the second opening 18 are staggered on the outer wall of the tube body 11.

[0064] In this embodiment, the first opening 14 and the second opening 18 can be respectively arranged on opposite sides of the outer wall of the pipe body 11, so that the outer wall of the pipe body 11 can achieve average load bearing. In addition, the first opening 14 and the second opening 18 can be staggered in the height direction, so as to avoid the outer wall thickness of the pipe body 11 being too thin, thereby avoiding affecting the strength of the pipe body 11.

[0065] In this embodiment of the application, a plurality of spray holes 20 are also provided at intervals on the side wall of the tube body 11 and the second opening 18 at the same horizontal height.

[0066] In this embodiment, when the desulfurizer or corrosion inhibitor is sprayed into the through hole 12 through the second opening 18, part of the desulfurizer or corrosion inhibitor is sprayed onto the wall of the continuous tubing 4, and part of it is sprayed out through the spray hole 20, thereby avoiding the desulfurizer or corrosion inhibitor remaining in the through hole 12.

[0067] In this embodiment of the application, the flow tube 15 extends in a direction parallel to the axial direction; or the flow tube 15 is bent.

[0068] In this embodiment, the flow tube 15 can be a straight cylindrical structure extending axially, which facilitates production and application.

[0069] In this embodiment, the flow tube 15 can also be curved to adapt to different production and application requirements.

[0070] like Figure 3 As shown, in a second aspect, this application also provides a packer 100, including the continuous tubing rapid pressure test injection sub-section 1 as described above;

[0071] Blowout preventer 2, the first end of the continuous tubing rapid pressure test injection section 1 is connected to the blowout preventer 2;

[0072] Blowout preventer 3, the second end of the continuous tubing rapid pressure test injection section 1 is connected to the blowout preventer 3;

[0073] A continuous tubing 4 extends sequentially into the blowout preventer 3, the continuous tubing rapid pressure test injection section 1, and the blowout preventer 2.

[0074] In this embodiment, the system includes a blowout preventer (BOP) 3, a coiled tubing quick-test injection sub 1, a blowout preventer (BOP) 2, and coiled tubing 4. The BOP 3, the coiled tubing quick-test injection sub 1, and the BOP 2 are connected sequentially by threads. The coiled tubing 4 extends sequentially into the BOP 3, the coiled tubing quick-test injection sub 1, and the BOP 2. The other end of the BOP 2 can be connected to a downhole tool 5.

[0075] After replacing downhole tool 5, the connection between the blowout preventer 2 and the coiled tubing quick-test injection sub 1 needs to be disconnected to expose downhole tool 5, thus completing the replacement of downhole tool 5. Then, the connection between the coiled tubing quick-test injection sub 1 and the blowout preventer 2 is pressure tested. Because there are multiple tool replacement operations, a comprehensive pressure test of the previous technology can be performed during the first operation, ensuring the integrity of the seals on each section of the sealing ring 132. When replacing downhole tool 5, only the connection between the coiled tubing quick-test injection sub 1 and the blowout preventer 2 needs to be pressure tested.

[0076] This application provides a packer 100. The first end of a coiled tubing rapid pressure test injection sub 1 is connected to a blowout preventer (BOP) 2, and the second end is connected to a blowout preventer pipe (BOP) 3. After replacing the downhole tool 5, a pressure test is required between the first end of the coiled tubing rapid pressure test injection sub 1 and the BOP 2 to check the seal. High-pressure water is injected into the first opening 14. The high-pressure water enters the flow channel of the flow pipe 15 through the first opening 14, and then flows through the flow channel to the sealed space 131. If the sealing device 13 can achieve a seal, the high-pressure water will remain within the sealed space 131 and will not leak out; if the sealing device 13 cannot achieve a seal, the high-pressure water will leak out of the sealed space 131. Therefore, by setting a flow channel communicating with the sealed space 131 within the annular structure of the coiled tubing rapid pressure test injection sub 1, rapid pressure testing can be achieved, facilitating the verification of the integrity and seal of the connection between the BOP 3 and the BOP 2, while also ensuring the reliability of the packer 100.

[0077] The embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0078] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A coiled tubing quick pressure test injection pup joint, characterized by, include: The tube body has an annular structure and has a through hole along the axial direction for accommodating a continuous tubing. The first end of the tube has a sealing device, which forms a sealed space, and the outer wall of the tube has a first opening; a flow tube is provided inside the annular structure, which has a flow channel, and the first end of the flow tube is connected to the first opening, and the second end is connected to the sealed space.

2. The coiled tubing rapid pressure test injection sub according to claim 1, characterized in that, The first end of the tube has an annular groove. The groove extends to a predetermined depth in a direction parallel to the axial direction and extends to a predetermined thickness in a direction perpendicular to the axial direction. The predetermined thickness is less than the thickness of the annular structure. The sealing device is provided inside the groove.

3. The coiled tubing rapid pressure test injection sub according to claim 2, characterized in that, The sealing device includes two sealing rings spaced apart along the depth direction of the groove, the two sealing rings forming a sealing space, and the second end of the flow pipe communicating with the side wall of the groove between the two sealing rings.

4. The coiled tubing pressure test plug according to claim 1, wherein, Also includes: The first valve is located at the first opening.

5. The coiled tubing rapid pressure test injection sub according to claim 4, characterized in that, The outer wall is also provided with a second opening, which communicates with the through hole.

6. The coiled tubing pressure test plug according to claim 5, wherein, Also includes: The second valve is located at the second opening.

7. The coiled tubing rapid pressure test injection sub according to claim 6, characterized in that, Both the first valve and the second valve are one-way valves.

8. The coiled tubing rapid pressure test injection sub according to claim 5, characterized in that, The first opening and the second opening are staggered on the outer wall of the tube.

9. The coiled tubing rapid pressure test injection sub according to claim 5, characterized in that, Multiple spray holes are also provided at intervals on the side wall of the tube body at the same horizontal height as the second opening.

Images