An integrated process string for expansion tube bump testing

Abstract

The application discloses an integrated process pipe column for expansion pipe patching and pressure testing, which comprises an expansion pipe, a lifting assembly, an expansion cone assembly, a communication working rod assembly and a pressure testing working cylinder, wherein the lifting assembly and the expansion cone assembly are arranged inside the expansion pipe and are fixed by a snap ring, the communication working rod assembly is arranged inside the pressure testing working cylinder assembly and is hung below the expansion cone assembly by a suspension head. The application can complete the processes of expansion pipe patching, pressure testing and expansion head assembly lifting by one pipe column, and the process is simple and does not need the processes of bottom plugging treatment and mouth repairing, so that the whole process is completed by one pipe column, the operation efficiency is high, no falling objects are left in the patched well, and no adverse effect is caused on the subsequent processes. The application can reduce the operation cost and improve the patching success rate.

Description

Technical Field

[0001] This invention belongs to the field of oilfield well workover operations and relates to an integrated process string for expansion tube supplementation and pressure testing. Background Technology

[0002] Casing damage wells are common oil, gas and water accident wells in oil and gas field development. As the development of oil fields deepens, the number of casing damage wells will increase, seriously damaging the injection and production well network, making the degree of reserve control worse, and even causing reserve loss, which greatly restricts the virtuous cycle of oil and gas fields.

[0003] Expansion tube patching is an effective means of repairing wells damaged by casing. Conventional expansion tube patching technology involves lowering the expansion tube and supporting tools to the depth of the patching area, pressurizing the surface, and causing the expansion head to move upward under pressure. Utilizing the metal plastic deformation characteristics of the expansion tube, the expansion tube undergoes radial expansion. Anchoring and sealing are achieved with the original well casing through an anchoring device, thus achieving the purpose of reinforcement, patching, and plugging. After completing the expansion process, pressure testing and drilling the bottom plug with milling tools are required. The operation involves many steps and has high construction costs. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an integrated process tubing for expansion tube patching and pressure testing, which enables the expansion tube patching, pressure testing, and expansion head assembly removal to be completed in one trip, thereby reducing operating costs and improving the patching success rate.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an integrated process tubing for expansion tube and pressure testing, comprising an expansion tube, a lifting assembly, an expansion cone assembly, a connecting working rod assembly, and a pressure testing working cylinder; the upper connector and the inner tube of the retaining ring are threadedly fixedly connected to form the lifting assembly; the outer tube of the retaining ring, the expansion cone tube, and the connecting head are threadedly fixedly connected in sequence to form the expansion cone assembly; the suspension head, the sucker rod coupling, the sucker rod, and the limiting head are threadedly fixedly connected in sequence to form the connecting working rod assembly; the retrieval head, the retrieval body, the guide short section, the pressure testing short section, the tubing coupling, the tubing, and the plug are threadedly fixedly connected in sequence to form the pressure testing working cylinder assembly; the inner diameter of the expansion tube consists of a small diameter section at the top and a large diameter section at the bottom; the inner side of the large diameter section of the expansion tube has an inner groove, and the outer side of the small diameter section of the expansion tube has vulcanized sealing rubber; the lifting assembly and the expansion cone assembly are disposed inside the expansion tube, and the lifting assembly... The expansion cone assembly is fixed by a retaining ring. The connecting working rod assembly is located inside the pressure testing working cylinder assembly and is suspended below the expansion cone assembly by a suspension head. The inner and outer tubes of the retaining ring are unidirectionally anchored by the retaining ring. The expansion cone tube is fitted with an expansion cone, and the axial movement of the expansion cone is restricted by the expansion cone tube and the connecting head. The suspension head is suspended on the connecting head. Both the suspension head and the connecting head have radial water holes. The sealing assembly is placed in an annular space composed of the expansion tube, the retrieval head, and the split claw. A locking block is installed in the radial groove of the split claw. A ball seat is installed in the pressure testing short section. The pressure testing short section and the ball seat are fixed by a pin. The pressure testing short section is provided with radial holes. The claw end of the split claw is located in the inner groove of the expansion tube. The outer diameter of the expansion cone is divided into a major diameter and a minor diameter. The major diameter of the expansion cone at its initial position is located inside the major diameter of the expansion tube, and the minor diameter of the expansion cone at its initial position is located inside the minor diameter of the expansion tube.

[0006] The expansion tube's large-diameter section and small-diameter section transition with a 10-12 degree tapered shape.

[0007] The beneficial effects of this invention are: the expansion tube patching, pressure testing, and expansion head assembly removal are all completed in a single tubing run. The process is simple, eliminating the need for bottom plugging and top end repair. The entire process is completed in one tubing run, resulting in high operational efficiency. No debris remains in the well after patching, preventing any adverse effects on subsequent processes. This achieves the goal of reducing operating costs and increasing the patching success rate. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the integrated expansion tube and pressure testing process tubing of the present invention;

[0009] Figure 2 This is a schematic diagram of the first part of the integrated expansion tube and pressure testing process tubing of the present invention;

[0010] Figure 3 This is a schematic diagram of the second part of the integrated expansion tube and pressure testing process tubing of the present invention;

[0011] Figure 4 This is a schematic diagram of the third part of the integrated expansion tube and pressure testing process column of the present invention.

[0012] In the diagram: 1-Expansion tube, 2-Upper connector, 3-Inner tube of retaining ring, 4-Outer tube of retaining ring, 5-Retaining ring, 6-Expansion cone tube, 7-Expansion cone, 8-Connecting head, 9-Suspension head, 10-Retrieving head, 11-Suck rod coupling, 12-Suck rod, 13-Sealing assembly, 14-Locking block, 15-Split claw, 16-Retrieving body, 17-Guide short section, 18-Testing short section, 19-Ball seat, 20-Tubing coupling, 21-Tubing, 22-Limiting head, 23-Plug Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 element 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0016] like Figure 1-4As shown, the integrated expansion tube and pressure testing process string of the present invention includes an expansion tube, a lifting assembly, an expansion cone assembly, a connecting working rod assembly, and a pressure testing working cylinder. The key feature is that the upper connector 2 and the inner tube of the retaining ring 3 are threadedly connected to form the lifting assembly; the outer tube of the retaining ring 4, the expansion cone tube 6, and the connecting head 8 are threadedly connected in sequence to form the expansion cone assembly; the suspension head 9, the sucker rod coupling 11, the sucker rod 12, and the limiting head 22 are threadedly connected in sequence to form the connecting working rod. The assembly consists of a retrieval head 10, a retrieval body 16, a guide section 17, a pressure testing section 18, a pipe coupling 20, a pipe 21, and a plug 23, which are sequentially connected by threads to form the pressure testing working cylinder assembly. The expansion tube 1 has an inner diameter consisting of a small-diameter section at the top and a large-diameter section at the bottom. The large-diameter section of the expansion tube 1 has an inner groove on its inner side, and the small-diameter section of the expansion tube 1 has vulcanized sealing rubber on its outer side. The lifting assembly and the expansion cone assembly are located inside the expansion tube 1 and are fixed by a retaining ring 5. The connecting rod assembly is located inside the pressure testing cylinder assembly and is suspended below the expansion cone assembly via the suspension head 9. The inner tube 3 and outer tube 4 of the retaining ring are unidirectionally anchored by the retaining ring 5. The expansion cone tube 6 is sleeved with an expansion cone 7, and the axial movement of the expansion cone 7 is restricted by the expansion cone tube 6 and the connecting head 8. The suspension head 9 is suspended on the connecting head 8. Both the suspension head 9 and the connecting head 8 have radial water holes. The sealing assembly 13 is installed on the structure consisting of the expansion tube 1, the retrieval head 10, and the split claw 15. Within the annular space, a locking block 14 is installed in the radial groove of the split claw 15, and a ball seat 19 is installed in the test pressure short section 18. The test pressure short section 18 and the ball seat 19 are fixed together by a pin. The test pressure short section 18 is provided with a radial hole. The claw end of the split claw 15 is located in the inner groove of the expansion tube 1. The outer diameter of the expansion cone 7 is divided into a major diameter and a minor diameter. The major diameter of the expansion cone 7 at its initial position is located inside the major diameter of the expansion tube 1, and the minor diameter of the expansion cone 7 at its initial position is located inside the minor diameter of the expansion tube 1.

[0017] The expansion tube 1 has a 10-12 degree tapered transition between its large-diameter and small-diameter sections.

[0018] High-pressure liquid is injected from the upper connector 2. The high-pressure liquid enters the annular space through the radial water holes of the suspension head 9 and the connecting head 8, further pushing the expansion cone 7 to move. During the movement, the expansion cone 7 causes the expansion tube 1 to expand and fit tightly against the inner wall of the sleeve until the expansion tube 1 is fully expanded.

[0019] After the expansion tube 1 has fully expanded, the upper connector 2 and the inner tube 3 of the retaining ring are lifted a certain distance. The lifting distance is less than the distance between the limiting head 22 and the ball seat 19. The inner tube 3 of the retaining ring further drives the outer tube 4 of the retaining ring, the expansion cone tube 6, the connecting head 8, the suspension head 9, the retrieval head 10, the sucker rod 12, and the limiting head 22 to move upward. High pressure liquid is injected from the upper connector 2 to complete the supplementary pressure test.

[0020] After the pressure test is completed, continue to lift the upper connector 2 and the inner tube 3 of the retaining ring. When the limiting head 22 contacts the ball seat 19, continue to lift the pin of the test section 18 of the tubing. The radial hole of the test section 18 makes the tubing connected inside and outside.

[0021] Internal and external connections prevent the lifting of the tubing from creating a suction effect, thus completing the lifting of the tubing.

[0022] The specific steps for using an expansion tube patching process string are as follows:

[0023] 1. In an expansion tube fitting process, after the tubing is lowered to a predetermined position, high-pressure liquid is injected from the upper connector 2. The high-pressure liquid enters the annular space from the radial water holes of the suspension head 9 and the connecting head 8, further pushing the expansion cone 7 to move. During the movement, the expansion cone 7 causes the expansion tube 1 to expand and adhere tightly to the inner wall of the sleeve until the expansion tube 1 is fully expanded.

[0024] 2. After the expansion tube 1 has fully expanded, the upper connector 2 and the inner tube 3 of the retaining ring are lifted a certain distance. The inner tube 3 of the retaining ring further drives the outer tube 4 of the retaining ring, the expansion cone tube 6, the connecting head 8, the suspension head 9, the retrieval head 10, the sucker rod 12, and the limiting head 22 to move upward, so as to retrieve the expansion cone assembly from the expansion tube 1, eliminating the need for the conventional procedure of drilling the bottom plug. High pressure liquid is then injected through the upper connector 2 to complete the supplementary pressure test.

[0025] 3. After the pressure test is completed, continue to lift the upper connector 2 and the inner tube 3 of the retaining ring. When the limiting head 22 contacts the ball seat 19, continue to lift the tubing to cut the pin of the pressure test section 18. The radial hole of the pressure test section 18 connects the inside and outside of the tubing.

[0026] 4. Internal and external connections prevent the lifting of the tubing from creating a suction effect, thus completing the lifting of the tubing.

[0027] In summary, the content of this invention is not limited to the above-described embodiments. Those skilled in the art can easily propose other embodiments within the technical guiding principles of this invention, but such embodiments are all included within the scope of this invention.

Claims

1. An integrated process tubing for expansion tube and pressure testing, comprising an expansion tube, a lifting assembly, an expansion cone assembly, a connecting working rod assembly, and a pressure testing working cylinder, characterized in that, The upper connector (2) and the inner tube of the retaining ring (3) are fixedly connected by threads to form a lifting assembly; the outer tube of the retaining ring (4), the expansion cone tube (6), and the connecting head (8) are fixedly connected by threads in sequence to form an expansion cone assembly; the suspension head (9), the sucker rod coupling (11), the sucker rod (12), and the limiting head (22) are fixedly connected by threads in sequence to form a connecting working rod assembly; the retrieval head (10), the retrieval body (16), the guide sub (17), the pressure testing sub (18), the tubing coupling (20), and the tubing (21) are all fixedly connected by threads. The plugs (23) are connected by threads to form the test pressure working cylinder assembly; the inner diameter of the expansion tube (1) is the upper small diameter section and the lower large diameter section. The inner side of the large diameter section of the expansion tube (1) has an inner groove, and the outer side of the small diameter section of the expansion tube (1) has vulcanized sealing rubber; the lifting assembly and the expansion cone assembly are set inside the expansion tube (1), and the lifting assembly and the expansion cone assembly are fixed by the retaining ring (5). The connecting rod assembly is set inside the test pressure working cylinder assembly, and the connecting rod assembly is suspended by the suspension head (9). Below the expansion cone assembly; the inner tube (3) of the retaining ring and the outer tube (4) of the retaining ring are unidirectionally anchored by the retaining ring (5). The expansion cone tube (6) is sleeved with an expansion cone (7). The axial movement of the expansion cone (7) is restricted by the expansion cone tube (6) and the connecting head (8). The suspension head (9) is suspended on the connecting head (8). Both the suspension head (9) and the connecting head (8) have radial water holes. The sealing assembly (13) is placed in an annular space composed of the expansion tube (1), the retrieval head (10), and the split claw (15). The radial direction of the split claw (15) is... A locking block (14) is installed in the groove, and a ball seat (19) is installed in the test pressure short section (18). The test pressure short section (18) and the ball seat (19) are fixed by a pin. The test pressure short section (18) is provided with a radial hole. The claw end of the split claw (15) is located in the inner groove of the expansion tube (1). The outer diameter of the expansion cone (7) is divided into a major diameter and a minor diameter. The major diameter of the expansion cone (7) at its initial position is located inside the major diameter of the expansion tube (1), and the minor diameter of the expansion cone (7) at its initial position is located inside the minor diameter of the expansion tube (1).

2. The expansion tube patching and pressure testing integrated process tubing according to claim 1, characterized in that, The expansion tube (1) has a 10-12 degree tapered transition between its large-diameter and small-diameter sections.

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