Packer expansion tube patching tool

Abstract

The present invention discloses a packer expansion type expansion pipe patching tool, comprising an inner expansion device and an outer expansion pipe (7) arranged inside and outside, the inner expansion device comprising a packer and a central pipe (5) connected in sequence, the length of the packer being less than the length of the outer expansion pipe (7), the packer comprising a rubber tube (3), and when the rubber tube (3) of the packer is expanded, the outer expansion pipe (7) can be expanded. The packer expansion type expansion pipe patching tool uses an expansion packer to expand and seal the expansion pipe from top to bottom, and the packer expands the patching pipe to repair damaged and lost casing, plug the perforation section casing, complete the well with the expansion pipe of the side drilling, plug the complex formation of the well, and other problems. The technology adopts the method of using a packer instead of an expansion cone to expand and patch from top to bottom, and the inner diameter of the patching pipe is adjustable, and the original casing is deformed and the inner wall is severely corroded, and the patching can be performed, and the safety during construction is also increased, and the maximum diameter of the casing is obtained.

Description

Technical Field

[0001] The invention relates to the field of oil production equipment, in particular to a packer expansion type expansion tube patching tool. Background Art

[0002] At present, the expansion tube patching technology is commonly used in the repair of old wells in domestic oil fields. This technology is to expand the original casing from bottom to top by expanding the patching tube in the launch cavity after pressure. Although this technology is becoming more and more mature in China, the structure of a few old wells is relatively complex, and the expansion cone may get stuck during the expansion process from bottom to top. At the same time, since the expansion cone cannot be changed in diameter, the inner diameter of the casing in the patching section is required to be high, the well repair and channel opening cycle is long, and the success rate is not high. Especially in some old oil fields with poor casing conditions, the success rate of well repair and channel opening is even lower, the well repair cycle is longer, and the investment is constantly increasing, often exceeding the budget, forcing the termination of construction. The problem of difficult processing of the casing channel of the expansion tube patching well has always plagued the oil field, greatly limiting the promotion and application of the expansion tube patching technology in the oil field. In addition, once the casing damage occurs below the patching section after the expansion tube is patched, there is almost no way to repair it or the cost of well repair is excessively increased. In addition, the casing of the old wells in Changqing Oilfield, Daqing Oilfield, and Liaohe Oilfield has been in a corrosive environment for a long time, and the degree of casing corrosion is increasing. A corrosion-resistant expansion tube is urgently needed for repair operations. Summary of the invention

[0003] In order to solve the problem of low success rate of the existing expansion pipe patching technology using expansion cone, the present invention provides a packer expansion expansion pipe patching tool, which uses an expansion packer to expand and seal the expansion pipe from top to bottom, and uses the packer to expand the patching pipe to repair damaged and lost casing, plug the perforation section casing, complete the well with the expansion pipe of the side drilling, plug the complex formation of the drilling, etc. The technology uses a packer to replace the expansion cone to expand and patch from top to bottom. The inner diameter of the patching pipe is adjustable, and the original casing is deformed and the inner wall is severely corroded. At the same time, the safety during construction is increased, and the maximum diameter of the casing is obtained.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a packer expansion type expansion tube patching tool, including an inner expansion device and an outer expansion tube arranged inside and outside, the inner expansion device contains a packer and a center tube connected in sequence, the length of the packer is less than the length of the outer expansion tube, the packer contains a rubber tube, and when the rubber tube of the packer expands, it can cause the outer expansion tube to expand.

[0005] The packer also comprises an upper joint, an inner tube and a lower joint which are connected in sequence. A rubber sleeve is sleeved outside the inner tube. When pressure is applied to the packer, the rubber sleeve of the packer can expand.

[0006] The packer is in an upright state, the upper end of the rubber tube is sleeved outside the lower end of the upper joint, the lower end of the rubber tube is sleeved outside the upper end of the lower joint, and the side wall of the inner tube or the lower joint is provided with a pressure through hole.

[0007] The inner expansion device also includes a positioning well gauge and a limit joint, and the positioning well gauge, the packer, the central pipe and the limit joint are connected in sequence.

[0008] The outer expansion pipe is in an upright state, the positioning well gauge is located outside the upper end of the outer expansion pipe, the limit joint is located inside the lower end of the outer expansion pipe, and the limit joint and the outer expansion pipe are connected by a shear pin.

[0009] The length of the packer is smaller than that of the central tube, the lower end of the outer expansion tube is flush with the lower end of the limit joint, and the upper end of the outer expansion tube is flush with the upper end of the rubber sleeve.

[0010] A first hanging rubber tube, a first sealing hanging rubber tube, a second sealing hanging rubber tube and a second hanging rubber tube are sequentially sleeved on the outside of the outer expansion tube from top to bottom.

[0011] The first hanging rubber tube and the second hanging rubber tube are symmetrically arranged up and down, the first sealing hanging rubber tube and the second sealing hanging rubber tube are symmetrically arranged up and down, and the length of the first hanging rubber tube is equal to the length of the first sealing hanging rubber tube.

[0012] The first suspension rubber tube is identical to the second suspension rubber tube, the first sealing suspension rubber tube is identical to the second sealing suspension rubber tube, a drainage groove is arranged on the outer surface of the first suspension rubber tube, and the length of the rubber tube is 1 to 2 times the length of the first suspension rubber tube.

[0013] The rubber sleeve of the packer is in clearance fit with the outer expansion tube, the inner expansion device can move axially relative to the outer expansion tube, and the rubber sleeve of the packer can make the outer expansion tube expand in sections in sequence until it is fully expanded.

[0014] The beneficial effects of the present invention are:

[0015] 1. It can be used for the packer expansion expansion tube patching technology for 5 1 / 2″ casing well patching. The original casing is patched by using the expansion packer instead of the expansion cone expansion patching tube. The main principle is that after reaching the predetermined patching depth, the expansion packer is operated from top to bottom to set the seal, and the expansion packer squeezes the expansion tube for patching. After completing the patching of this section, the packer is retracted, and the above operation is repeated to complete all patching construction. This technology has low requirements on the wellbore size, greatly reduces the difficulty and time of processing channels, and improves construction safety. At the same time, after the patching is completed, the lower casing can continue to be patched through the patching position, and the expansion tube has anti-corrosion performance.

[0016] 2. The present invention can be applied to the inspection of micro-tanks in factories and gas stations, and can be extended to institutions such as universities and research institutes for the inspection of the bottom plates of experimental tanks, which has certain practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is a schematic diagram of the packer expansion type expansion tube patching tool of the present invention.

[0019] Figure 2 is a schematic diagram of the internal expansion device.

[0020] Figure 3 is a schematic diagram of the external expansion tube.

[0021] Figure 4 It is a schematic diagram of the upper part of the packer expansion type expansion tube patching tool of the present invention.

[0022] Figure 5 It is a schematic diagram of the upper part of the packer expansion type expansion tube patching tool of the present invention.

[0023] Figure 6 It is a schematic diagram of the lower part of the packer expansion type expansion tube patching tool of the present invention.

[0024] 1. Positioning well gauge; 2. Upper joint; 3. Rubber tube; 4. Lower joint; 5. Center tube; 6. Limit joint; 7. External expansion tube; 8. First hanging rubber tube; 9. First sealing hanging rubber tube; 10. Shear pin; 11. Second sealing hanging rubber tube; 12. Second hanging rubber tube; 13. Punching through hole. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application 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.

[0026] A packer expansion type expansion tube patching tool, comprising an inner expansion device and an outer expansion tube 7 arranged inside and outside, the inner expansion device comprising a packer and a central tube 5 connected in sequence, the length of the packer being shorter than the length of the outer expansion tube 7, the packer comprising a rubber tube 3, when the rubber tube 3 of the packer expands, the outer expansion tube 7 can be expanded, such as Figures 1 to 6 shown.

[0027] In this embodiment, the packer is a K344 packer, which further comprises an upper joint 2, an inner tube and a lower joint 4 which are connected in sequence, and a rubber sleeve 3 is sleeved outside the inner tube. When pressure is applied to the packer, the rubber sleeve 3 of the packer can expand.

[0028] In this embodiment, the axis of the upper joint 2, the axis of the inner tube, the axis of the lower joint 4, the axis of the rubber tube 3 and the axis of the center tube 5 coincide, the packer is in an upright state, the lower end of the upper joint 2 is threadedly connected to the upper end of the inner tube, the upper end of the lower joint 4 is threadedly connected to the lower end of the inner tube, and the lower end of the lower joint 4 is threadedly connected to the upper end of the center tube 5.

[0029] In this embodiment, the upper end of the rubber cylinder 3 is sleeved outside the lower end of the upper joint 2, and the lower end of the rubber cylinder 3 is sleeved outside the upper end of the lower joint 4. The side wall of the inner tube or the lower joint 4 is provided with a punching hole 13. When pressure liquid is injected into the inner tube of the packer, the pressure liquid can enter between the rubber cylinder 3 and the inner tube through the punching hole 13, thereby causing the rubber cylinder 3 to expand radially, that is, the diameter of the rubber cylinder 3 becomes larger.

[0030] In this embodiment, the internal expansion device further comprises a positioning well gauge 1 and a limit joint 6. The positioning well gauge 1, the packer, the central tube 5 and the limit joint 6 are sequentially connected from top to bottom. The axis of the positioning well gauge 1, the axis of the limit joint 6 and the axis of the central tube 5 coincide. The outer diameter of the central tube 5 is smaller than the outer diameter of the rubber tube 3.

[0031] The positioning well gauge 1 is a cylindrical structure, and the outer surface of the positioning well gauge 1 is provided with an expanded neck section, and the outer diameter of the expanded neck section is equal to the inner diameter of the expanded outer expansion tube 7. The lower end of the positioning well gauge 1 is threadedly connected to the upper end of the upper joint 2, and the lower end of the center pipe 5 and the upper end of the limit joint 6 can be connected and fixed by means of threads, pins or welding.

[0032] In this embodiment, the positioning well gauge 1 is located outside the upper end of the outer expansion pipe 7, the limit joint 6 is located inside the lower end of the outer expansion pipe 7, the limit joint 6 is a cylindrical structure, and the limit joint 6 and the outer expansion pipe 7 are connected by a shear pin 10. The outer diameter of the limit joint 6 is greater than the outer diameter of the center pipe 5, and the outer diameter of the limit joint 6 is equal to the inner diameter of the outer expansion pipe 7.

[0033] In this embodiment, the length of the packer is less than that of the central tube 5. Preferably, the lower end of the outer expansion tube 7 is flush with the lower end of the limit joint 6, and the upper end of the outer expansion tube 7 is flush with the upper end of the rubber tube 3. The material of the outer expansion tube 7 is stainless steel. The positioning well gauge 1 has the function of single-stroke positioning of the packer and the function of testing the diameter of the expansion tube after expansion.

[0034] In this embodiment, the first suspension rubber tube 8, the first sealing suspension rubber tube 9, the second sealing suspension rubber tube 11 and the second suspension rubber tube 12 are sequentially sleeved on the outer side of the outer expansion tube 7 from top to bottom. The first suspension rubber tube 8 and the second suspension rubber tube 12 provide a suspension force between the outer expansion tube 7 and the casing after expansion, and the first sealing suspension rubber tube 9 and the second sealing suspension rubber tube 11 provide a sealing force between the outer expansion tube 7 and the casing after expansion.

[0035] In this embodiment, the first suspension rubber tube 8 is located at the upper end of the outer expansion tube 7, and the second suspension rubber tube 12 is located at the lower end of the outer expansion tube 7. The first suspension rubber tube 8 and the second suspension rubber tube 12 are symmetrically arranged up and down and are mirror images of each other, the first sealing hanging rubber tube 9 and the second sealing hanging rubber tube 11 are symmetrically arranged up and down and are mirror images of each other, and the length of the first suspension rubber tube 8 is equal to the length of the first sealing hanging rubber tube 9. The distance between the upper end of the first suspension rubber tube 8 and the upper end of the outer expansion tube 7 is 0cm-5cm, and the distance between the first suspension rubber tube 8 and the first sealing hanging rubber tube 9 is 0cm-5cm.

[0036] The first suspension rubber tube 8, the first sealing suspension rubber tube 9, the second sealing suspension rubber tube 11 and the second suspension rubber tube 12 are all fixed to the outside of the outer expansion tube 7 by vulcanization. The inner diameters of the first suspension rubber tube 8, the first sealing suspension rubber tube 9, the second sealing suspension rubber tube 11 and the second suspension rubber tube 12 are all equal to the outer diameter of the outer expansion tube 7. The length of the first suspension rubber tube 8 is 10%-20% of the length of the outer expansion tube 7. Figure 1 The dimensions in the vertical direction are, for example, the length of the first suspension rubber tube 8 is about 1.5 m, and the length of the outer expansion tube 7 is about 9 m. The thickness of the first suspension rubber tube 8 and the thickness of the first sealing suspension rubber tube 9 are about 1.5 mm to 3 mm.

[0037] In this embodiment, the first suspension rubber tube 8 is identical to the second suspension rubber tube 12, the first sealing suspension rubber tube 9 is identical to the second sealing suspension rubber tube 11, the outer surface of the first suspension rubber tube 8 is provided with at least one drainage groove, and the drainage groove is opened along the axis direction of the first suspension rubber tube 8, and the length of the rubber tube 3 is 1 to 2 times the length of the first suspension rubber tube 8. For example, the length of the rubber tube 3 is 1 times the length of the first suspension rubber tube 8, that is, the length of the rubber tube 3 is equal to the length of the first suspension rubber tube 8.

[0038] In this embodiment, when the packer and the outer expansion tube 7 are both in the initial state, that is, when the rubber tube 3 of the packer and the outer expansion tube 7 are not expanded, the rubber tube 3 of the packer and the outer expansion tube 7 can be loosely matched. When the shear pin 10 is broken, the inner expansion device can move axially relative to the outer expansion tube 7, and the rubber tube 3 of the packer can make the outer expansion tube 7 expand in sections from top to bottom in sequence until it is fully expanded.

[0039] The meaning of the outer expansion tube 7 expanding in sections in sequence until it is fully expanded is, for example, the length of the outer expansion tube 7 is 9m, and the length of the rubber cylinder 3 is 1.5m. First, the upper end of the rubber cylinder 3 is flush with the upper end of the outer expansion tube 7, that is, the rubber cylinder 3 corresponds to a section 0-1.5m below the upper end of the outer expansion tube 7, and the first expansion of the rubber cylinder 3 can expand the section 0-1.5m below the upper end of the outer expansion tube 7; then, the rubber cylinder 3 moves downward, and the rubber cylinder 3 corresponds to a section 1.5-3m below the upper end of the outer expansion tube 7, and the second expansion of the rubber cylinder 3 can expand the section 1.5-3m below the upper end of the outer expansion tube 7; then, the rubber cylinder 3 moves downward, and the rubber cylinder 3 corresponds to a section 3m-4.5m below the upper end of the outer expansion tube 7, and the third expansion of the rubber cylinder 3 can expand the section 3m-4.5m below the upper end of the outer expansion tube 7; then, The rubber cylinder 3 moves downward, and the rubber cylinder 3 corresponds to a section 4.5m-6m below the upper end of the outer expansion tube 7. The fourth expansion of the rubber cylinder 3 can expand the section 4.5m-6m below the upper end of the outer expansion tube 7; then, the rubber cylinder 3 moves downward, and the rubber cylinder 3 corresponds to a section 6m-7.5m below the upper end of the outer expansion tube 7. The fifth expansion of the rubber cylinder 3 can expand the section 6m-7.5m below the upper end of the outer expansion tube 7; then, the rubber cylinder 3 moves downward, and the rubber cylinder 3 corresponds to a section 7.5m-9m below the upper end of the outer expansion tube 7. The sixth expansion of the rubber cylinder 3 can expand the section 7.5m-9m below the upper end of the outer expansion tube 7. At this time, the entire expansion of the outer expansion tube 7 is completed.

[0040] The working process of the packer expansion tube patching tool is introduced below.

[0041] For example, if a well casing is seriously corroded and the casing is leaking, the inner expansion device is set in the outer expansion pipe 7, and the lower end of the inner expansion device is connected and fixed to the outer expansion pipe 7 by a shear pin 10. The packer of the inner expansion device and the outer expansion pipe 7 are both in the initial state. Figure 1 The length of the rubber tube 3 is slightly greater than the length of the first suspension rubber tube 8 and the first sealing suspension rubber tube 9 , and the position of the rubber tube 3 corresponds to the position of the first suspension rubber tube 8 , that is, the rubber tube 3 is located inside the first suspension rubber tube 8 .

[0042] Connect the upper part of the positioning well gauge 1 to the surface oil pipe, lower the packer expansion expansion tube patching tool to the casing leakage position, connect the wellhead oil pipe to the surface pressure device, start the surface pressure device to transmit the pressure fluid to the rubber tube 3 of the packer, and after the rubber tube 3 expands, it forces the section where the first suspension rubber tube 8 on the outer expansion tube 7 is located to expand. Under the action of the expansion force, the first suspension rubber tube 8 compresses on the casing wall to provide suspension force. After the pressure rises to the expansion pressure of the expansion tube, the pressure is released to complete the first section of expansion, and at this time, the outer expansion tube 7 has been suspended on the casing wall.

[0043] Lift or reverse the pipe string (i.e., the internal expansion device), destroy the shear pin 10, and then lower the pipe string. When the hanging weight is significantly reduced, it means that the positioning well gauge 1 has reached the lower part of the first stroke after expansion, that is, the lower end of the first hanging rubber tube 8 after expansion. After lifting the fixed size to adjust the position of the packer, the position of the rubber tube 3 corresponds to the position of the first sealing hanging rubber tube 9, and the rubber tube 3 of the packer is pressurized and expanded for the second time. At this time, after the rubber tube 3 expands, it forces the first sealing hanging rubber tube 9 on the outer expansion tube 7 to expand. Under the action of the expansion force, the first sealing hanging rubber tube 9 compresses on the casing wall to provide sealing ability. After the pressure rises to the expansion pressure of the expansion tube, the pressure is released to complete the second expansion. Repeat the above operations to complete all the pressurization strokes until there is no change in the hanging weight when the pipe string is lowered, indicating that the expansion tube is completely expanded and sealed on the casing, the pipe string is pulled out, and the casing patching operation is completed. The above process realizes the expansion of the outer expansion tube 7 in sections until it is fully expanded.

[0044] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. A packer expansion tube patching tool, characterized in that: The packer expansion type expansion tube patching tool comprises an inner expansion device and an outer expansion tube (7) which are arranged inside and outside, the inner expansion device comprises a packer and a central tube (5) which are connected in sequence, the length of the packer is shorter than the length of the outer expansion tube (7), the packer comprises a rubber tube (3), and when the rubber tube (3) of the packer expands, the outer expansion tube (7) can be expanded; The packer also comprises an upper joint (2), an inner tube and a lower joint (4) which are connected in sequence, and a rubber tube (3) is sleeved outside the inner tube. When pressure is applied to the packer, the rubber tube (3) of the packer can expand. The internal expansion device also comprises a positioning well gauge (1) and a limit joint (6), and the positioning well gauge (1), the packer, the central pipe (5) and the limit joint (6) are connected in sequence; The outer expansion pipe (7) is in an upright state, the positioning well gauge (1) is located outside the upper end of the outer expansion pipe (7), the limit joint (6) is located inside the lower end of the outer expansion pipe (7), and the limit joint (6) and the outer expansion pipe (7) are connected via a shear pin (10); The length of the packer is shorter than the length of the central tube (5), the lower end of the outer expansion tube (7) is flush with the lower end of the limit joint (6), and the upper end of the outer expansion tube (7) is flush with the upper end of the rubber tube (3); The outer expansion tube (7) is sleeved with a first hanging rubber tube (8), a first sealing hanging rubber tube (9), a second sealing hanging rubber tube (11) and a second hanging rubber tube (12) in sequence from top to bottom; The rubber sleeve (3) of the packer is clearance-matched with the outer expansion tube (7), the inner expansion device can move axially relative to the outer expansion tube (7), and the rubber sleeve (3) of the packer can cause the outer expansion tube (7) to expand in sections in sequence until it is fully expanded.

2. The packer expansion type expansion tube patching tool according to claim 1, characterized in that: The packer is in an upright state, the upper end of the rubber tube (3) is sleeved outside the lower end of the upper joint (2), the lower end of the rubber tube (3) is sleeved outside the upper end of the lower joint (4), and the side wall of the inner tube or the lower joint (4) is provided with a pressure through hole (13).

3. The packer expansion type expansion tube patching tool according to claim 1, characterized in that: The first hanging rubber tube (8) and the second hanging rubber tube (12) are symmetrically arranged in the upper and lower parts, the first sealing hanging rubber tube (9) and the second sealing hanging rubber tube (11) are symmetrically arranged in the upper and lower parts, and the length of the first hanging rubber tube (8) is equal to the length of the first sealing hanging rubber tube (9).

4. The packer expansion type expansion tube patching tool according to claim 3, characterized in that: The first suspension rubber tube (8) is identical to the second suspension rubber tube (12), the first sealing suspension rubber tube (9) is identical to the second sealing suspension rubber tube (11), a drainage groove is provided on the outer surface of the first suspension rubber tube (8), and the length of the rubber tube (3) is 1 to 2 times the length of the first suspension rubber tube (8).

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