Cable-passing easy-to-take drillable segmented water injection tubular column assembly

Abstract

The invention discloses a cable-passing easy-to-take drillable segmented water injection tubular column assembly which comprises a ground control system, a sleeve, an oil pipe, a cable-passing removable drillable anchor, a cable-passing salvageable drillable step-by-step deblocking packer, a cable-passing variable-diameter centralizer, an intelligent water distributor and a setting ball seat. In the using state, oil pipes are arranged in the casing pipe, every two connected oil pipes are connected through the corresponding intelligent water distributor, the cable-passing removable and drillable anchor is installed on the oil pipe at the front end of a pipe column, and the setting ball seat is installed at the end of the oil pipe at the tail end of the pipe column. At least one set of cable-passing salvageable drillable step-by-step deblocking packer and cable-passing variable-diameter centralizer which are adjacently arranged are arranged on the oil pipe of each of the vertical well section and the horizontal section, and the cable-passing variable-diameter centralizer is arranged at the lower end of the cable-passing salvageable drillable step-by-step deblocking packer; the ground control system controls opening or closing of the intelligent water distributor. According to the invention, the problems of low safety, high later maintenance difficulty, long time consumption and high cost of a conventional cable-passing separate injection tubular column are effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield injection and production, and in particular relates to an easily accessible drillable segmented water injection pipe column component that passes through a cable. Background Art

[0002] In recent years, cable-controlled stratified water injection technology has been widely used underground. This technology has many advantages, such as multiple adjustable layers, high measurement and adjustment accuracy, short time, good safety, and low cost. It can realize real-time monitoring and automatic control of the whole process of stratified water injection. This technology uses oil pipes to connect multiple packers and intelligent water distributors in series, which are lowered into the well. One end of the cable is tied outside the oil pipe and connected to each underground intelligent distributor. The other end of the cable is connected to the ground control system, and commands and data are sent and received through the cable, so as to realize real-time monitoring of each distributor and adjustment of the water nozzle opening.

[0003] At present, the cable segmented water injection string adopts tubing (external cable) + safety joint + conventional centralizer + cable Y341 conventional packer + intelligent water distributor structure + check valve structure. The string has a simple structure and no anchoring device. It is easy to damage the cable when it is lowered, and it is easy to creep and lose the seal during water injection. The matching downhole device is a conventional tool, which does not have the functions of salvage, step-by-step unsealing, step-by-step abandonment, drilling and grinding, and variable diameter. When the string is lowered into the well, especially in highly deviated wells and horizontal wells, if it is required to be abandoned from the safety joint, and then special tools are lowered to salvage and overhaul the horizontal sections one by one, it is expensive and difficult. Summary of the invention

[0004] The purpose of the present invention is to provide an easily accessible drillable segmented water injection pipe string assembly through a cable to solve the problems of insufficient pipe string function, low operational safety, great difficulty in later well repair and incompatibility of devices in the prior art.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A cable-through, easily retrievable, drillable, segmented water injection pipe string assembly, comprising a ground control system, a cable, a casing, an oil pipe, a cable-through, retrievable, drillable anchor, a cable-through, retrievable, drillable, step-by-step unsealing packer, a cable-through, variable-diameter centralizer, an intelligent water distributor, and a sealing ball seat;

[0007] When in use, the oil pipe is set in the casing, and the two connected oil pipes are connected by an intelligent water distributor. The drillable anchor is installed on the oil pipe at the front end of the pipe string through the cable, and the sealing ball seat is installed on the end of the oil pipe at the end of the pipe string.

[0008] At least one set of adjacently arranged cable-through-drillable-step-by-step-unsealing packers and cable-through-variable-diameter centralizers are installed on the oil pipes of the vertical well section and the horizontal section, and the cable-through-variable-diameter centralizer is installed at the lower end of the cable-through-drillable-step-by-step-unsealing packers;

[0009] The ground control system is connected to the intelligent water distributor through cables passing through a cable-retrievable and drillable anchor, a cable-retrievable and drillable step-by-step unsealing packer, and a cable-variable diameter centralizer, to control the opening or closing of the intelligent water distributor.

[0010] A further improvement of the present invention is that the outer diameter of the cable-through variable diameter centralizer is larger than the outer diameter of the cable-retrievable and drillable step-by-step unsealing packer.

[0011] A further improvement of the present invention is that a drillable anchor is installed on the oil pipe at the front end of the pipe string through a cable, and is installed in a vertical well section for a highly deviated well or a horizontal well.

[0012] A further improvement of the present invention is that the cable removable and drillable anchor comprises an upper joint A, a ball, a release sleeve, an outer cover, a release claw spring, an upper cone A, a slip, a slip cover, a lower cone, an upper cylinder, a lower cylinder, a lower joint A and a center tube A;

[0013] The upper joint A is threadedly connected to the center tube A, the release sleeve is built into the upper joint A, the ball is built into the release sleeve, the outer cover is sleeved on the outside of the release claw spring, the release claw spring A is threadedly connected to the center tube A, the slips are five pieces installed in the slip cover, the upper cone A and the lower cone are sleeved on the center tube A, and are respectively located at the upper and lower ends of the slip A and in contact with the slips; the upper cylinder barrel is threadedly connected to the lower cylinder barrel, the lower cylinder barrel is threadedly connected to the lower joint A, and the lower joint A is threadedly connected to the center tube A.

[0014] A further improvement of the present invention is that, except for the slip cover part of the cable-removable drillable anchor, the maximum steel body diameter of the remaining part is less than or equal to 98 mm.

[0015] A further improvement of the present invention is that the packer that can be fished and drilled through the cable and released step by step comprises an upper joint B, a sealing sleeve, an eccentric sleeve, a well-washing piston, a shear sleeve, an upper pressure ring, a central pipe B and a lower joint B;

[0016] The upper joint B is threadedly connected with the eccentric sleeve, and the sealing sleeve is installed in the eccentric side hole of the eccentric sleeve; the eccentric sleeve is threadedly connected with the center pipe B, the well washing piston is installed on the shear sleeve, the upper pressure ring is sleeved on the center pipe B and is tightly attached to the end face of the shear sleeve, and the center pipe B and the lower joint B are inserted and sealed.

[0017] A further improvement of the present invention is that the eccentric passage of the lower joint B is an 8 mm round hole.

[0018] A further improvement of the present invention is that the central pipe B of the packer that can be fished out and drilled step by step through the cable is a split structure, which can achieve graded unsealing.

[0019] A further improvement of the present invention is that the cable-through variable diameter centralizer comprises an upper joint C, a connecting sleeve, an upper cone B, a centralizing block, a centralizing seat, a cylinder, a centralizing ring, a center tube C and a lower joint C;

[0020] The upper joint C is threadedly connected to the connecting sleeve, the connecting sleeve is threadedly connected to the upper cone B, and the three straightening blocks are installed in the straightening seat; the straightening seat is threadedly connected to the cylinder, the straightening ring is threadedly connected to the lower joint C, and the center pipe C is threadedly connected to the lower joint C.

[0021] A further improvement of the present invention is that the cable-through variable diameter centralizer has a cable passage, and the cable passes from the upper end through the upper cone B groove, through the middle of the centralizing block with a phase angle of 120°, through the centralizing seat groove, along the outer wall of the cylinder to the lower end of the centralizer.

[0022] The present invention has at least the following beneficial technical effects:

[0023] The present invention provides an easily retrievable and drillable segmented water injection pipe column assembly through a cable. By arranging a variable-diameter straightener through a cable, a step-by-step unsealing packer that can be retrieved and drilled through a cable, a retrievable and drillable anchor through a cable, and an intelligent water distributor, the packer in the water injection pipe column is ensured to be in a central position, so that the sealing rubber cylinder can effectively maintain the sealing performance for a long time, and can be smoothly sealed and unsealed in complex wells such as horizontal wells and deep wells, ensuring that the water injection pipe column is not stuck. The process is more reliable, safe, and easy to operate, and can effectively solve the problems of low safety, great difficulty in later maintenance, long time consumption, and high cost of conventional segmented water injection pipe columns through cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the cable segmented water injection string.

[0025] Figure 2 Schematic diagram of the structure of the drillable anchor that can be taken through the cable.

[0026] Figure 3 Top view of the drillable anchor for cable access.

[0027] Figure 4 Schematic diagram of the structure of the packer that can be fished out and drilled step by step through the cable.

[0028] Figure 5 This is a schematic diagram of the structure of a cable variable diameter straightener.

[0029] Figure 6 This is a top view of the cable variable diameter straightener.

[0030] Description of reference numerals:

[0031] 1. Ground control system; 2. Cable; 3. Casing; 4. Oil pipe; 5. Cable-accessible and drillable anchor; 6. Cable-accessible and drillable step-by-step unsealing packer; 7. Cable-accessible variable diameter centralizer; 8. Intelligent water distributor; 9. Sealing ball seat;

[0032] 5-1, upper joint A; 5-2, ball; 5-3, release sleeve; 5-4, outer cover; 5-5, release claw spring; 5-6, upper cone A; 5-7, slip; 5-8, slip cover; 5-9, lower cone; 5-10, upper cylinder; 5-11, lower cylinder; 5-12, lower joint A; 5-13, center tube A;

[0033] 6-1, upper joint B; 6-2, sealing sleeve; 6-3, eccentric sleeve; 6-4, well washing piston; 6-5, shear sleeve; 6-6, upper pressure ring; 6-7, center pipe B; 6-8, lower joint B;

[0034] 7-1, upper joint C; 7-2, connecting sleeve; 7-3, upper cone B; 7-4, straightening block; 7-5, straightening seat; 7-6, cylinder; 7-7, straightening ring; 7-8, center tube C; 7-9, lower joint C. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] like Figures 1 to 6As shown, the present invention proposes an easily retrievable drillable segmented water injection pipe string assembly through a cable, which at least includes: a sealing ball seat 9, an intelligent water distributor 8, a cable variable diameter straightener 7, a cable retrievable drillable step-by-step unsealing packer 6, a cable retrievable drillable anchor 5, an oil pipe 4, a casing 3, a cable 2 and a ground control system 1; for highly deviated wells or horizontal wells installed in the vertical well section, the cable retrievable drillable anchor 5 is installed at the front end of the pipe string, the cable variable diameter straightener 7 is installed next to the cable retrievable drillable step-by-step unsealing packer 6, the device is connected to the oil pipe 4 by end threads, and the oil pipe 4 and its device are both serially connected inside the casing. When in use, the oil pipe 4 is arranged in the casing 3, and the two connected oil pipes 4 are connected by an intelligent water distributor 8. The cable-retrievable and drillable anchor 5 is installed on the oil pipe 4 at the front end of the pipe string, and the sealing ball seat 9 is installed on the end of the oil pipe 4 at the end of the pipe string; at least one set of adjacent cable-retrievable and drillable step-by-step unsealing packers 6 and cable-variable diameter straighteners 7 are installed on the oil pipes of the vertical well section and the horizontal section, and the cable-variable diameter straightener 7 is installed at the lower end of the cable-retrievable and drillable step-by-step unsealing packers 6; the ground control system 1 is connected to the intelligent water distributor 8 through the cable 2 that passes through the cable-retrievable and drillable anchor 5, the cable-retrievable and drillable step-by-step unsealing packer 6 and the cable-variable diameter straightener 7 respectively, to control the opening or closing of the intelligent water distributor 8.

[0037] The cable-through variable diameter centralizer 7 includes an upper joint C7-1, a connecting sleeve 7-2, an upper cone B7-3, a centralizing block 7-4, a centralizing seat 7-5, a cylinder 7-6, a centralizing ring 7-7, a central tube C7-8 and a lower joint C7-9. The upper joint C7-1 is threadedly connected to the connecting sleeve 7-2, the connecting sleeve 7-2 is threadedly connected to the upper cone B7-3, the centralizing block 7-4 is composed of three pieces and installed in the centralizing seat 7-5; the centralizing seat 7-5 is threadedly connected to the cylinder 7-6, the centralizing ring 7-7 is threadedly connected to the lower joint C7-9, and the central tube C7-8 is threadedly connected to the lower joint C7-9.

[0038] The cable-passing variable diameter centralizer has a cable passage, and the cable passes from the upper end through the upper cone B7-3 groove, through the middle of the centralizer block with a phase angle of 120°, through the centralizer seat 7-5 groove, along the outer wall of the cylinder 7-6 to the lower end of the centralizer.

[0039] The cable-through variable diameter centralizer is a hydraulic centralizer. When the pipe column is sealed, the centralizer seat 7-5 pushes the centralizer block 7-4 upward and expands to fit the casing to complete the centralization. After the pipe column is sealed, the centralizer block contacts the liquid in the well and begins to dissolve. After a period of time, the dissolution is completed. When the pipe column is lifted, it does not affect the lifting of the pipe column. A dissolvable centralizer is connected to each of the upper and lower ends of the pipe column packer.

[0040] The said straightening block is a soluble metal, which can dissolve and disappear after long-term contact with the liquid in the well. The said straightening ring 7-7 is made of soluble metal to ensure that the cable is protected during the lowering of the pipe column. After a period of water injection, the pipe column is completely dissolved.

[0041] The cable-retrievable and drillable step-by-step unsealing packer 6 comprises an upper joint B6-1, a sealing sleeve 6-2, an eccentric sleeve 6-3, a well-washing piston 6-4, a shear sleeve 6-5, an upper pressure ring 6-6, a center pipe B6-7 and a lower joint B6-8; the upper joint B6-1 is threadedly connected to the eccentric sleeve 6-3, and the sealing sleeve 6-2 is installed in the eccentric side hole of the eccentric sleeve 6-3; the eccentric sleeve 6-3 is threadedly connected to the center pipe B6-7, the well-washing piston 6-4 is installed on the shear sleeve 6-5, the upper pressure ring 6-6 is sleeved on the center pipe B6-7 and is tightly attached to the end face of the shear sleeve 6-5, and the center pipe B6-7 and the lower joint B6-8 are inserted and sealed. The cable-through, drillable and step-by-step unsealing packer is provided with an eccentric cable passage. During operation, the cable passes through the sealing sleeve 6-2 from top to bottom, passes through the eccentric hole of the eccentric sleeve 6-3, and the cable passes through the eccentric channel of the central pipe B6-7 and the eccentric channel of the lower joint B6-8. The eccentric channel is an 8mm round hole. The cable-through, drillable and step-by-step unsealing packer also has a backwashing function. During backwashing, the backwashing fluid pushes the well-washing piston 6-4 and enters the annular channel between the shear sleeve 6-5 and the central pipe B6-7 to perform well washing operations.

[0042] The central pipe B6-7 of the packer that can be fished out and drilled through the cable and released step by step is a split structure, which can realize graded release.

[0043] The eccentric sleeve 6-3 of the packer that can be fished out and drilled through the cable and released step by step is made of drillable material, and can be drilled and ground with a sleeve milling tool when it gets stuck.

[0044] The cable-removable drillable anchor 5 includes an upper connector A5-1, a ball 5-2, a release sleeve 5-3, an outer cover 5-4, a release claw spring 5-5, an upper cone A5-6, a slip 5-7, a slip cover 5-8, a lower cone 5-9, an upper cylinder 5-10, a lower cylinder 5-11 and a lower connector A5-12; the upper connector A5-1 is threadedly connected to the center tube A5-13, the release sleeve 5-3 is built into the upper connector A5-1, the ball 5-2 is built into the release sleeve 5-3, and the outer cover 5-4 is set On the outside of the release claw spring 5-5, the release claw spring A5-5 is threadedly connected with the center tube A5-13, the slip 5-7 is five pieces installed in the slip cover 5-8, the upper cone A5-6 and the lower cone 5-9 are sleeved on the center tube A5-13, and are respectively located at the upper and lower ends of the slip A5-7 and in contact with the slip 5-7; the upper cylinder 5-10 is threadedly connected with the lower cylinder 5-11, the lower cylinder 5-11 is threadedly connected with the lower joint A5-12, and the lower joint A5-12 is threadedly connected with the center tube A5-13. The cable-through drillable anchor is connected to the uppermost end of the pipe column to play an anchoring role, the upper joint A5-1 is threadedly connected with the center tube A5-13, and when working, the high-pressure liquid pushes the lower cone 5-9 to push the slip 5-7 to anchor on the casing 3, completing the anchoring of the pipe column. The anchor is provided with a hydraulic safety release function. When the pipe string is stuck and cannot be released, the ball 5-2 is pressed, the ball 5-2 and the release sleeve 5-3 move downward, and the outer cover 5-4 moves upward. At this time, the release claw spring 5-3 loses its limit, and the pipe string is released at the release claw spring 5-5, thereby realizing the release function.

[0045] The anchor has the function of passing the cable, that is, the cable passes through the 8mm groove milled by the upper cone A5-6 and the lower cone 5-9 from the upper end of the tool, the upper connector A5-1 and the outer wall of the outer cover 5-4. The anchor is composed of 3 slips with an angle of 120°. The cable passes through the lower cone groove between the slips of the upper cone A5-6 groove to complete the cable passing.

[0046] The anchor has a maximum steel body diameter of less than or equal to 98 mm except for the slip covers 2-8.

[0047] The present invention is implemented by the following technical scheme, taking the injection of the horizontal section into three sections as an example:

[0048] The structure of the pipe string from bottom to top includes: a sealing ball seat 9, an intelligent water distributor 8, a cable-through variable diameter straightener 7, a cable-through retrievable and drillable step-by-step unsealing packer 6, a cable-through retrievable and drillable anchor 5, a tubing 4, a casing 3, a cable 2 and a ground control system 1. Figure 2 and Figure 3 shown.

[0049] The specific operation method of the present invention is as follows:

[0050] ① Use oil pipes to connect all downhole devices in sequence and lower them into the well. At this time, the outer diameter of the cable-adjustable centralizer 7 is 115mm, which is more than 4mm larger than the outer diameter of the packer. During the lowering process, it can effectively protect the packer rubber tube from contacting the casing and causing friction damage;

[0051] ② After the string is lowered into place, the pressure is built up in the wellhead tubing to the pressure point a, the cable-retrievable drillable anchor 5 is started, and the anchor claw extends out of the anchor casing 3; it is raised to the pressure point b, the cable-retrievable diameter straightener 7 is started, and the outer diameter of the straightener block increases to the inner diameter of the casing 3; it is further raised to the pressure point c, and the cable-retrievable drillable step-by-step unsealing packer 6 is started to achieve setting;

[0052] ③ The cable is connected to the ground control system and water injection begins normally. After a period of time, the straightening block of the cable variable diameter straightening device 7 dissolves and the outer diameter shrinks;

[0053] ④ When it is necessary to bring out the entire tubing string at a later stage, directly lift up the tubing string, first unseal the cable retrievable drillable anchor 5, continue to lift up, unseal the multiple cable retrievable drillable step-by-step unsealing packers 6 at the bottom one by one, and realize the bringing out of the entire tubing string; if it is stuck, first rotate the tubing 2 at the wellhead, and drop it at the cable retrievable drillable anchor 5, or drop it by throwing a ball into the tubing 2 to hold the pressure and realize the dropping, and bring out the upper half of the cable retrievable drillable anchor 5 and the upper tubing; then lower the salvage device for salvage, if it is stuck again during salvage, directly lift up a larger load, drop it at the cable retrievable drillable step-by-step unsealing packer 6, bring out the upper part, lower the drilling and grinding tool to drill and grind the lower part and salvage it again, and finally realize the bringing out of the remaining tubing at the bottom.

[0054] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. An easily accessible drillable segmented water injection pipe string assembly through a cable, characterized in that: It comprises a ground control system (1), a cable (2), a casing (3), an oil pipe (4), a cable-retrievable and drillable anchor (5), a cable-retrievable and drillable step-by-step unsealing packer (6), a cable-retrievable and drillable centralizer (7), an intelligent water distributor (8) and a sealing ball seat (9); When in use, the oil pipe (4) is arranged in the casing (3), the two connected oil pipes (4) are connected via an intelligent water distributor (8), a drillable anchor (5) is installed on the oil pipe (4) at the front end of the pipe string via a cable, and a sealing ball seat (9) is installed on the end of the oil pipe (4) at the end of the pipe string; At least one set of adjacently arranged cable-through-retrievable-drillable-step-by-step-unsealing packer (6) and cable-through-variable-diameter centralizer (7) is installed on the oil pipes of the vertical well section and the horizontal well section, and the cable-through-variable-diameter centralizer (7) is installed at the lower end of the cable-through-retrievable-drillable-step-by-step-unsealing packer (6); The ground control system (1) is connected to the intelligent water distributor (8) through a cable (2) passing through a cable-retrievable and drillable anchor (5), a cable-retrievable and drillable step-by-step unsealing packer (6) and a cable-variable diameter straightener (7), thereby controlling the opening or closing of the intelligent water distributor (8).

2. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 1, characterized in that: The outer diameter of the cable-through variable diameter centralizer (7) is larger than the outer diameter of the cable-retrievable and drillable step-by-step unsealing packer (6).

3. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 1, characterized in that: The drillable anchor (5) is installed on the oil pipe (4) at the front end of the pipe string through the cable, and is installed in the vertical well section for highly deviated wells or horizontal wells.

4. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 1, characterized in that: The cable removable drillable anchor (5) comprises an upper joint A (5-1), a ball (5-2), a release sleeve (5-3), an outer cover (5-4), a release claw spring (5-5), an upper cone A (5-6), a slip (5-7), a slip cover (5-8), a lower cone (5-9), an upper cylinder (5-10), a lower cylinder (5-11), a lower joint A (5-12) and a central tube A (5-13); The upper joint A (5-1) is threadedly connected to the central tube A (5-13), the release sleeve (5-3) is built in the upper joint A (5-1), the ball (5-2) is built in the release sleeve (5-3), the outer cover (5-4) is sleeved on the outer side of the release claw spring (5-5), the release claw spring A (5-5) is threadedly connected to the central tube A (5-13), the slips (5-7) are five pieces installed in the slip cover (5-8), the upper cone A (5-6) and the lower cone (5-9) are sleeved on the central tube A (5-13), and are respectively located at the upper and lower ends of the slips A (5-7) and contact the slips (5-7); the upper cylinder (5-10) is threadedly connected to the lower cylinder (5-11), the lower cylinder (5-11) is threadedly connected to the lower joint A (5-12), and the lower joint A (5-2) is threadedly connected to the central tube A (5-13).

5. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 4, characterized in that: Except for the slip cover (5-8) of the drillable anchor (1) that can be taken through the cable, the maximum steel body diameter of the remaining part is less than or equal to 98 mm.

6. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 1, characterized in that: The packer (6) which can be fished and drilled through a cable and released step by step comprises an upper joint B (6-1), a sealing sleeve (6-2), an eccentric sleeve (6-3), a well-washing piston (6-4), a shear sleeve (6-5), an upper pressure ring (6-6), a central pipe B (6-7) and a lower joint B (6-8); The upper joint B (6-1) is threadedly connected to the eccentric sleeve (6-3), and the sealing sleeve (6-2) is installed in the eccentric side hole of the eccentric sleeve (6-3); the eccentric sleeve (6-3) is threadedly connected to the center pipe B (6-7), the well washing piston (6-4) is installed on the shear sleeve (6-5), the upper pressure ring (6-6) is sleeved on the center pipe B (6-7) and is tightly attached to the end surface of the shear sleeve (6-5), and the center pipe B (6-7) and the lower joint B (6-8) are inserted and sealed.

7. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 6, characterized in that: The eccentric channel of the lower joint B (6-8) is an 8mm round hole.

8. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 6, characterized in that: The central pipe B (6-7) of the packer (6) which can be fished out and drilled step by step through the cable is a split structure, and can realize step-by-step unsealing.

9. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 1, characterized in that: The cable-through variable diameter centralizer (7) comprises an upper joint C (7-1), a connecting sleeve (7-2), an upper cone B (7-3), a centralizing block (7-4), a centralizing seat (7-5), a cylinder (7-6), a centralizing ring (7-7), a central tube C (7-8) and a lower joint C (7-9); The upper joint C (7-1) is threadedly connected to the connecting sleeve (7-2), the connecting sleeve (7-2) is threadedly connected to the upper cone B (7-3), the straightening block (7-4) is composed of three pieces and is installed in the straightening seat (7-5); the straightening seat (7-5) is threadedly connected to the cylinder (7-6), the straightening ring (7-7) is threadedly connected to the lower joint C (7-9), and the center pipe C (7-8) is threadedly connected to the lower joint C (7-9).

10. The easily accessible drillable segmented water injection pipe column assembly through a cable according to claim 9, characterized in that: The cable-through variable diameter centralizer (7) has a cable-through passage, and the cable (2) passes from the upper end through the groove of the upper cone B (7-3) through the middle of the centralizer block with a phase angle of 120 degrees, passes through the groove of the centralizer seat (7-5), and passes along the outer wall of the cylinder (7-6) to the lower end of the centralizer.

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