阅读说明：本技术 一种套损井修复工具及修复方法 (Casing damage well repairing tool and repairing method ) 是由 于海洋 张文起 王海龙 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种套损井修复工具及修复方法,包括本体,本体上连接有修复组件,修复组件与本体之间通过密封组件密封连接,所述修复组件包括固定套设在本体外部且横截面呈波浪形结构的波纹管,波纹管的中部与本体之间形成有膨胀腔,本发明能够通过对传统膨胀管补贴段以深套损段进行机械补贴修复,并且整体结构简单,现场操作快捷且安全可靠,能够快速实现修复作业,大大提高修复工作效率,并且修复时无需打捞作业,防止打捞困难,后期处理十分方便,有效延长整个油井无故障的工作周期,提高油井综合经济效益。(The invention discloses a casing damage well repairing tool and a repairing method, wherein the casing damage well repairing tool comprises a body, a repairing assembly is connected onto the body, the repairing assembly is in sealing connection with the body through a sealing assembly, the repairing assembly comprises a corrugated pipe which is fixedly sleeved on the outer portion of the body and has a cross section in a wave-shaped structure, and an expansion cavity is formed between the middle portion of the corrugated pipe and the body.)

1. A casing damage well repair tool, comprising a body (1), characterized in that: the body (1) is connected with a repairing assembly, and the repairing assembly is hermetically connected with the body (1) through a sealing assembly.

2. a cased well restoration tool according to claim 1, wherein: the integral shape of the body (1) is a hollow cylindrical structure, and an oil pipe thread buckle (12) which is convenient for communicating the body (1) with an oil pipe is arranged on the body (1).

3. a cased well restoration tool according to claim 2, wherein: one end of the body (1) far away from the oil pipe thread buckle (12) is fixedly connected with one end used for packaging the body (1), so that a plug (4) of a pressurizing cavity (13) is formed in the body (1).

4. A cased well restoration tool according to claim 3, wherein: the repair assembly comprises a corrugated pipe (2) which is fixedly sleeved outside the body (1) and has a cross section of a wave-shaped structure, and an expansion cavity (22) is formed between the middle part of the corrugated pipe (2) and the body (1).

5. A cased well restoration tool according to claim 4, wherein: one end of the corrugated pipe (2) close to the plug (4) is fixedly connected with the body (1) through threaded connection, the thread direction of the thread is opposite to that of the oil pipe thread buckle (12), and the other end of the corrugated pipe (2) is in clearance fit with the body (1).

6. A cased well restoration tool according to claim 5, wherein: the body (1) is provided with a plurality of groups of communicating holes (7) uniformly distributed along the outer circumference of the body (1), and the pressurizing cavity (13) in the body (1) is communicated with the expansion cavity (22) through the communicating holes (7).

7. A cased well restoration tool according to claim 6, wherein: the sealing assembly comprises sealing rings (7) which are sleeved on the body (1) and are respectively close to two ends of the corrugated pipe (2) and used for enhancing the sealing performance of a joint between the corrugated pipe (2) and the body (1).

8. a method of repairing a cased well repair tool according to claims 1 to 7, wherein: the repairing method specifically comprises the following steps:

1) Firstly, processing a casing damage well casing (5) channel, and determining the depth of the position to be repaired;

2) Connecting the casing damage well repairing tool to an oil pipe, and driving the casing damage well repairing tool to descend to a casing damage position to be repaired by the oil pipe;

3) Then injecting high-pressure oil into the oil pipe to enable the high-pressure oil to enter a pressurizing cavity (13) and enter an expansion cavity (22) through a communicating hole (7), enabling the corrugated pipe (2) to be stressed and uniformly expanded to start seat sealing until the outer surface of the corrugated pipe (2) is attached to the sleeve damage section position of the sleeve (5) to achieve sleeve damage repairing;

4) After the corrugated pipe (2) is repaired and patched, the oil pipe is rotated reversely to release the body (1) and the corrugated pipe (2), the oil pipe column is lifted, and the body (1) and the plug (4) are integrally lifted out;

5) And after the oil pipe column, the body (1) and the plug (4) are lifted, the upper and lower ports of the corrugated pipe (2) are trimmed, so that the upper and lower ends of the corrugated pipe (2) are trimmed to be straight with the casing (5), and the repair of the damaged well is finished.

9. A method of repairing a cased well repair tool according to claim 8, wherein: the pressure for starting the setting of the corrugated pipe (2) is 20-30 MPa.

10. a method of repairing a cased well repair tool according to claim 9, wherein: and in the step 5), the upper and lower ports of the corrugated pipe (2) are trimmed, namely, the telescopic forging milling cutter is driven by lower hydraulic force to extend downwards to a repair section, and the upper and lower ports of the corrugated pipe (2) are trimmed to be straight with the sleeve (5).

Technical Field

the invention relates to a casing damage well repairing tool and a repairing method, in particular to a casing damage well repairing tool and a repairing method which are simple in structure, convenient to operate and capable of rapidly repairing a casing damage well, and belongs to the technical field of oil and gas exploitation.

Background

In the petroleum production, the oil well casing pipe can be damaged in different degrees under the influence of complex factors such as complex faults, abnormal ground stress, salt-gypsum layers, high-salinity formation water, production increasing and injection increasing measures and the like in the marine environment, so that a casing damage well is formed, and great economic loss is caused while the normal production of an oil field is influenced.

The traditional casing damage well repairing method adopts an expansion pipe patching technology to repair, and if the method is well specified, the method comprises the following steps: 201810654693.4, discloses a repairing tool and a repairing method for expansion pipe suspended insertion, comprising an oil pipe, an expansion pipe, a fishable bottom plug and an insertion pipe; the fishable bottom plug comprises a tieback cylinder and a plug; the plug is arranged at the bottom end of the tieback cylinder; the tieback cylinder and the insertion pipe are both hollow cylinders; the upper end of the tieback cylinder is connected with the lower end of the expansion pipe; the lower end of the insertion tube is connected with the upper end of the tieback cylinder; the insertion pipe is connected with the oil pipe through the upper end of the insertion pipe; and an expansion cone is arranged on the pipe body of the expansion pipe.

Although the casing damage well repairing tool and the repairing method have the characteristics of simple construction process, permanent sealing after casing repairing, small size change of a well hole and the like, the problems that the drift diameter of the casing is reduced after the casing is repaired by using the expansion pipe, and effective mechanical plugging cannot be carried out after casing damage occurs to a subsequent repairing section due to the fact that the subsequent repairing section is damaged easily under the influence of low expansion rate of the expansion pipe still exist.

Disclosure of Invention

the invention aims to solve the main technical problem of providing a casing damage well repairing tool which is simple in structure, convenient to operate and capable of quickly repairing a casing damage well.

in order to solve the technical problems, the invention provides the following technical scheme:

The utility model provides a casing damage well repair instrument, includes the body, is connected with the restoration subassembly on the body, restores through seal assembly sealing connection between subassembly and the body.

the following is a further optimization of the above technical solution of the present invention:

The whole shape of the body is a hollow cylindrical structure, and an oil pipe thread buckle which is convenient for communicating the body with the oil pipe is arranged on the body.

Further optimization: one end of the body, which is far away from the oil pipe thread buckle, is fixedly connected with one end used for packaging the body, so that a plug of a pressurizing cavity is formed in the body.

Further optimization: the repair assembly comprises a corrugated pipe which is fixedly sleeved outside the body and has a cross section in a wave-shaped structure, and an expansion cavity is formed between the middle of the corrugated pipe and the body.

Further optimization: one end of the corrugated pipe close to the plug is fixedly connected with the body through threaded connection, the thread direction of the thread is opposite to that of the oil pipe thread buckle, and the other end of the corrugated pipe is in clearance fit with the body.

Further optimization: the body is provided with a plurality of groups of intercommunicating pores uniformly distributed along the outer circumference of the body, and the pressurizing cavity in the body is communicated with the expansion cavity through the intercommunicating pores.

Further optimization: the sealing assembly comprises sealing rings which are sleeved on the body and are respectively close to two ends of the corrugated pipe and used for enhancing the sealing performance of the joint between the corrugated pipe and the body.

The invention also provides a method for repairing the casing damage well by the casing damage well repairing tool, which comprises the following steps:

1) Firstly, processing a casing damage well casing pipe channel and determining the depth of the position to be repaired;

2) Connecting the casing damage well repairing tool to an oil pipe, and driving the casing damage well repairing tool to descend to a casing damage position to be repaired by the oil pipe;

3) then injecting high-pressure oil into the oil pipe to enable the high-pressure oil to enter a pressurizing cavity and enter an expansion cavity through a communication hole, enabling the corrugated pipe to be stressed and uniformly expanded to start seat sealing until the outer surface of the corrugated pipe is attached to the sleeve damage section of the sleeve to achieve sleeve damage repairing;

4) After the corrugated pipe repair patch is finished, reversely rotating the oil pipe to release the body and the corrugated pipe, lifting the oil pipe column, and integrally lifting the body and the plug;

5) And after the oil pipe column, the body and the plug are lifted, the upper and lower ports of the corrugated pipe are trimmed, so that the upper and lower ends of the corrugated pipe are trimmed to be straight with the casing pipe, and the damaged well is repaired.

The following is a further optimization of the above technical solution of the present invention:

The initial setting pressure of the corrugated pipe is 20-30 MPa.

Further optimization: and 5) finishing the upper and lower ports of the corrugated pipe, namely, utilizing lower hydraulic force to drive the telescopic forging milling cutter to extend downwards to a repairing section, and finishing the upper and lower ports of the corrugated pipe to be straight with the sleeve.

By adopting the technical scheme, the invention has the advantages of ingenious design and reasonable structure, can carry out mechanical patching repair on the traditional expansion pipe patching section by using the deep casing damage section, has simple integral structure, quick, safe and reliable field operation, can quickly realize repair operation, greatly improves the repair work efficiency, does not need salvage operation during repair, prevents salvage difficulty, is very convenient for post-processing, effectively prolongs the fault-free work period of the whole oil well and improves the comprehensive economic benefit of the oil well.

The invention is further illustrated with reference to the following figures and examples.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 2 is a schematic diagram of construction operation according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of construction operation according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of construction operation according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of construction operation in the embodiment of the present invention.

In the figure: 1-body; 11-left-hand thread; 12-oil pipe thread fastening; 13-a pressurized chamber; 14-flat thread; 2-a bellows; 21-reversely threading internal threads; 22-an expansion chamber; 3-sealing ring; 4-plug; 5-sleeving a pipe; 6-expansion pipe; 7-communicating hole.

Detailed Description