CN110439491A - Packer expanding expandable casing patching tool - Google Patents

Abstract

The invention discloses a packer-expandable expansion tube supplementary tool, which comprises an inner expansion device and an outer expansion tube (7) arranged inside and outside, and the inner expansion device contains a packer and a center pipe (5) connected in sequence , the length of the packer is less than the length of the outer expansion tube (7), the packer contains a rubber tube (3), when the rubber tube (3) of the packer expands, the outer expansion tube ( 7) Swelling. The packer-expandable expansion pipe subsidy tool uses an expansion packer to expand and set the expansion pipe from top to bottom. Through the packer expansion subsidy pipe, it can repair the damaged leakage casing, seal the casing of the perforation section, side Completion of drilling expansion pipes, plugging of complex formations in drilling, etc. This technology uses a packer instead of an expansion cone to expand subsidy from top to bottom. The subsidy pipe can be subsidized if the inner diameter is adjustable, the original casing is deformed, and the inner wall is severely corroded. It also increases the safety during construction and Get the maximum diameter of the casing.

Description

Packer Expansion Expansion Pipe Subsidy Tool

technical field

The invention relates to the field of oil exploitation equipment, in particular to a packer-expandable expansion pipe subsidy tool.

Background technique

At present, the expansion tube subsidy technology is commonly used in the repair of old wells in domestic oilfields. This technology is to subsidize the original casing by expanding the expansion cone in the firing chamber through pressure from bottom to top. Although this technology is becoming more and more mature in China , but a few old wells have complex structures, and the expansion cone may be stuck during the expansion process from bottom to top. At the same time, due to the non-variable diameter of the expansion cone, the requirement for the inner diameter of the casing in the subsidy section is high, the workover and drilling period is long, and the success rate is not high, especially in some old oil fields with poor casing conditions, the success rate of the workover and drilling is even lower , the workover period is longer, and the investment is constantly increasing, which often exceeds the budget, forcing the termination of construction. The problem of difficult handling of the casing channel of expansion tube subsidized wells has been plagued by oilfields, which greatly limits the popularization and application of expansion tube subsidy technology in oil fields. In addition, once the casing damage occurs below the subsidized section after the expansion pipe is subsidized, there is almost no way to repair it or the workover cost will increase excessively. In addition, the old well casings in Changqing Oilfield, Daqing Oilfield, and Liaohe Oilfield have been in a corrosive environment for a long time, and the corrosion degree of the casing is increasing day by day. There is an urgent need for a corrosion-resistant expansion pipe for repair work.

Contents of the invention

In order to solve the problem of the low success rate of the existing technology of using expansion cones to achieve expansion pipe subsidy, the present invention provides a packer-expandable expansion pipe subsidy tool, which uses an expansion packer to The expansion tube is expanded and set from top to bottom, and through the packer expansion subsidy tube, problems such as repairing the damaged leakage casing, sealing the casing of the perforation section, completion of the sidetracking expansion tube, and plugging the complex formation of the well are achieved. This technology uses a packer instead of an expansion cone to expand subsidy from top to bottom. The inner diameter of the subsidized pipe can be adjusted, the original casing is deformed, and the inner wall is severely corroded. It can also be subsidized, and it also increases the safety during construction, and Get the maximum diameter of the casing.

The technical solution adopted by the present invention to solve the technical problem is: a packer expansion expansion tube subsidy tool, including an inner expansion device and an outer expansion tube arranged inside and outside, and the internal expansion device contains packers connected in sequence and the central pipe, the length of the packer is less than the length of the outer expansion pipe, and the packer contains a rubber sleeve, which can expand the outer expansion pipe when the rubber sleeve of the packer expands.

The packer also includes an upper joint, an inner pipe, and a lower joint connected in sequence. The rubber sleeve is sleeved outside the inner pipe. When the packer is pressed, the rubber sleeve of the packer can expand .

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 pipe or the lower joint is provided with a pressure through hole .

The internal expansion device also includes a positioning well gauge and a limit joint, and the positioning well gauge, the packer, the center pipe and the limit joint are connected in sequence.

The outer expansion tube is in an upright state, the positioning well gauge is located outside the upper end of the outer expansion tube, the limit joint is located in the lower end of the outer expansion tube, and the limit joint and the outer expansion tube are connected by shear pins.

The length of the packer is less than the length of the central pipe, the lower end of the outer expansion pipe is flush with the lower end of the stop joint, and the upper end of the outer expansion pipe is flush with the upper end of the rubber cylinder.

A first hanging rubber tube, a first sealing hanging rubber tube, a second sealing hanging rubber tube and a second hanging rubber tube are sheathed on the outside of the outer expansion tube from top to bottom.

The first suspension rubber cylinder and the second suspension rubber cylinder are symmetrically arranged up and down, the first sealing hanging rubber cylinder and the second sealing hanging rubber cylinder are vertically symmetrically arranged, and the length of the first hanging rubber cylinder is equal to the length of the first sealing hanging rubber cylinder.

The first hanging rubber cylinder is exactly the same as the second hanging rubber cylinder, the first sealing hanging rubber cylinder is exactly the same as the second sealing hanging rubber cylinder, the outer surface of the first hanging rubber cylinder is provided with a drainage groove, and the length of the rubber cylinder is the first 1 to 2 times the length of the hanging rubber tube.

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 expand the outer expansion tube in sections until all swell.

The beneficial effects of the present invention are:

1. Packer-expandable expansion tube subsidy technology that can be used for subsidy in 5 1/2″ cased wells, using expansion packer instead of expansion cone expansion subsidy tube to subsidize the original casing. The main principle is to reach the scheduled subsidy After the depth is reached, the expansion packer is set from top to bottom, and the expansion packer extrudes the expansion tube for subsidy. After completing the subsidy, the packer is shrunk, and the above operation is continued to complete all subsidy construction. The wellbore size requirement is relatively low, which greatly reduces the difficulty and time of processing channels, and improves construction safety. At the same time, after the subsidy is completed, the subsidy can be continued to the lower casing through the subsidy position, and the expansion tube has anti-corrosion performance.

2. The present invention is applicable to the detection of miniature storage tanks in factories and gas stations, and can be extended to universities, research institutes and other institutions for the detection of experimental storage tank bottom plates, which has certain practical significance.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

Fig. 1 is a schematic diagram of a packer-expandable expansion pipe patching tool according to the present invention.

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

Fig. 3 is a schematic diagram of an external expansion tube.

Fig. 4 is a schematic diagram of the upper part of the packer-expandable expansion pipe patching tool according to the present invention.

Fig. 5 is a schematic diagram of the upper part of the packer-expandable expansion pipe patching tool according to the present invention.

Fig. 6 is a schematic view of the lower part of the packer-expandable expansion pipe patching tool of the present invention.

1. Positioning well gauge; 2. Upper joint; 3. Rubber tube; 4. Lower joint; 5. Center tube; 6. Limit joint; 7. Outer expansion tube; 8. First suspension rubber tube; 9. 1. Seal hanging rubber tube; 10. Shearing pin; 11. Second sealing hanging rubber tube; 12. Second hanging rubber tube; 13. Pressure through hole.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features 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 examples.

A packer-expandable expansion tube supplementary tool, comprising an inner expansion device and an outer expansion tube 7 arranged inside and outside, the internal expansion device contains a packer and a center pipe 5 connected in sequence, and the length of the packer is Less than the length of the outer expansion tube 7, the packer contains a rubber sleeve 3, which can expand the outer expansion tube 7 when the rubber sleeve 3 of the packer expands, as shown in Fig. 1 to Fig. 6 .

In this embodiment, the packer is a K344 packer, and the packer also includes an upper joint 2, an inner pipe and a lower joint 4 connected in sequence, and the rubber sleeve 3 is sleeved outside the inner pipe. When pressing into the packer, the rubber barrel 3 of the packer can expand.

In this embodiment, the axis of the upper joint 2, the axis of the inner pipe, the axis of the lower joint 4, the axis of the rubber tube 3 and the axis of the central pipe 5 coincide, the packer is in an upright state, and the upper joint 2 The lower end of the lower joint is threaded with the upper end of the inner pipe, the upper end of the lower joint 4 is threaded with the lower end of the inner pipe, and the lower end of the lower joint 4 is threaded with the upper end of the center pipe 5.

In this embodiment, 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 inner tube or the side wall of the lower joint 4 is provided with a pressing Through hole 13. When the pressure fluid is injected into the inner tube of the packer, the pressure fluid can enter between the rubber tube 3 and the inner tube through the pressure through hole 13, so that the rubber tube 3 expands radially, that is, the rubber tube 3 diameter becomes larger.

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

The positioning well gauge 1 has a cylindrical structure, and the outer surface of the positioning well gauge 1 is provided with a neck expansion section, and the outer diameter of the neck expansion section is equal to the inner diameter of the outer expansion tube 7 after expansion. The lower end of the positioning well gauge 1 is threadedly connected with 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 threads, pins or welding.

In this embodiment, the positioning gauge 1 is located outside the upper end of the outer expansion tube 7, and the limit joint 6 is located in the lower end of the outer expansion tube 7. The limit joint 6 is a cylindrical structure, and the limit joint 6 is connected to the outer expansion tube. The tubes 7 are connected by shear pins 10 . The outer diameter of the limit joint 6 is larger than the outer diameter of the central pipe 5 , and the outer diameter of the limit joint 6 is equal to the inner diameter of the outer expansion tube 7 .

In this embodiment, the length of the packer is less than the length of the central pipe 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 Qi, the material of the outer expansion tube 7 is stainless steel. The positioning gauge 1 has the function of single-stroke positioning of the packer and the function of testing the diameter of the expansion pipe after expansion.

In this embodiment, the outer expansion tube 7 is sheathed 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 from top to bottom. The function of the first suspension rubber cylinder 8 and the second suspension rubber cylinder 12 is to provide the suspension force between the outer expansion tube 7 and the casing after expansion, and the function of the first seal suspension rubber cylinder 9 and the second seal suspension rubber cylinder 11 is Provide the sealing force between the expanded outer expansion tube 7 and the casing.

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 cylinder 8 and the second suspension rubber cylinder 12 are symmetrically arranged up and down and are mirror images of each other. The first sealing rubber cylinder 9 and the second sealing rubber cylinder 11 are symmetrically arranged up and down and are mirror images of each other. The length equals the length of the first seal hanging rubber cylinder 9. The distance between the upper end of the first hanging rubber tube 8 and the upper end of the outer expansion tube 7 is 0cm-5cm, and the distance between the first hanging rubber tube 8 and the first sealing hanging rubber tube 9 is 0cm-5cm.

The first suspension rubber cylinder 8, the first seal suspension rubber cylinder 9, the second seal suspension rubber cylinder 11 and the second suspension rubber cylinder 12 are all fixed outside the outer expansion tube 7 by vulcanization. The first suspension rubber cylinder 8, the second suspension rubber cylinder The inner diameters of the first sealing hanging rubber cylinder 9 , the second sealing hanging rubber cylinder 11 and the second hanging rubber cylinder 12 are 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, and the length is the dimension on the up and down direction in Fig. 1, for example, the length of the first suspension rubber tube 8 is about 1.5m, and the outer The expansion pipe 7 has a length of about 9m. The thickness of the first suspension rubber cylinder 8 and the thickness of the first sealing suspension rubber cylinder 9 are about 1.5mm-3mm.

In this embodiment, the first suspension rubber cylinder 8 is identical to the second suspension rubber cylinder 12, the first seal suspension rubber cylinder 9 is identical to the second seal suspension rubber cylinder 11, and the outer surface of the first suspension rubber cylinder 8 is provided with There is at least one drainage groove, and the drainage groove is opened along the axial direction of the first suspension rubber cylinder 8, and the length of the rubber cylinder 3 is 1 to 2 times the length of the first suspension rubber cylinder 8. For example, the length of the rubber cylinder 3 is twice the length of the first suspension rubber cylinder 8 , that is, the length of the rubber cylinder 3 is equal to the length of the first suspension rubber cylinder 8 .

In this embodiment, when both the packer and the outer expansion tube 7 are in the initial state, that is, when the rubber sleeve 3 of the packer and the outer expansion tube 7 are not expanded, the glue of the packer The cylinder 3 and the outer expansion tube 7 can be clearance fit. When the shear pin 10 is destroyed, the internal expansion device can move axially relative to the outer expansion tube 7, and the rubber sleeve 3 of the packer can expand the outer expansion tube 7 sequentially from top to bottom until the entire swell.

Wherein, the expansion of the outer expansion tube 7 in sections until fully expanded means that, for example, the length of the outer expansion tube 7 is 9 m, and the length of the rubber tube 3 is 1.5 m. First, the upper end of the rubber tube 3 is flush with the upper end of the outer expansion tube 7, that is, the rubber tube 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 tube 3 can make the outer expansion tube 7 A section of 0-1.5m below the upper end expands; then, the rubber tube 3 moves downward, and the rubber tube 3 corresponds to a section of 1.5-3m below the upper end of the outer expansion tube 7, and the second expansion of the rubber tube 3 can make the outer expansion tube 7 A section 1.5-3m below the upper end expands; then, the rubber tube 3 moves downward, and the rubber tube 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 tube 3 can make the outer expansion tube 7 A section of 3m-4.5m below the upper end expands; then, the rubber tube 3 moves downward, and the rubber tube 3 corresponds to a section of 4.5m-6m below the upper end of the outer expansion tube 7, and the fourth expansion of the rubber tube 3 can make the outer expansion tube 7. A section of 4.5m-6m below the upper end expands; then, the rubber tube 3 moves downward, and the rubber tube 3 corresponds to a section of 6m-7.5m below the upper end of the outer expansion tube 7. The fifth expansion of the rubber tube 3 can make the outer expansion A section of 6m-7.5m below the upper end of the tube 7 expands; then, the rubber tube 3 moves downward, and the rubber tube 3 corresponds to a section of 7.5m-9m below the upper end of the outer expansion tube 7, and the sixth expansion of the rubber tube 3 can make the outer A section of 7.5m-9m below the upper end of the expansion tube 7 expands, and now the outer expansion tube 7 is fully expanded.

The following describes the working process of the packer expandable expansion pipe subsidy tool.

For example, if the casing of a certain well corrodes seriously and the casing leaks, the inner expansion device is sleeved 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 internal expansion device and the external expansion tube 7 are both in the initial state, as shown in FIG. 1 . The length of the rubber cylinder 3 is slightly longer than the length of the first suspension rubber cylinder 8 and the first seal suspension rubber cylinder 9, and the position of the rubber cylinder 3 corresponds to the position of the first suspension rubber The inner side of the rubber cylinder 8.

Connect the upper part of the positioning well gauge 1 to the surface tubing, lower the packer expansion expansion tube subsidy tool to the leaking part of the casing, connect the wellhead tubing to the ground pressing device, and start the ground pressing device to transmit the pressure fluid to the packer The rubber sleeve 3, after the expansion of the rubber sleeve 3, forces the first suspension rubber sleeve 8 on the outer expansion tube 7 to expand, and the first suspension rubber sleeve 8 is compressed on the casing wall under the action of the expansion force to provide suspension force. After the pressure rises to the expansion pressure of the expansion tube, the first stage of expansion is completed by releasing the pressure, and now the outer expansion tube 7 has been suspended on the casing wall.

Lift or reverse the pipe string (that is, 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, After the expansion, the lower end of the first hanging rubber cylinder 8 is lifted up to adjust the position of the packer to a fixed size, so that the position of the rubber cylinder 3 corresponds to the position of the first sealing hanging rubber cylinder 9, and the second packer glue is carried out. The cylinder 3 is pressurized and expanded. At this time, after the expansion of the rubber cylinder 3, the section of the first sealing hanging rubber cylinder 9 on the outer expansion pipe 7 is forced to expand, and the first sealing hanging rubber cylinder 9 is compressed on the casing wall under the action of the expansion force. Provide sealing ability. After the pressure rises to the expansion pressure of the expansion tube, the pressure is released to complete the second stage of expansion. Repeat the above operations to complete all the pressing strokes until there is no change in the suspended weight of the lowering string, indicating that the expansion tube is completely expanded and seated on the casing. , pull out the pipe string, and complete the casing subsidy operation. The above-mentioned process realizes that the outer expansion tube 7 expands sequentially in sections until fully expanded.

The above is only a specific embodiment of the present invention, and cannot limit the scope of the invention, so the replacement of its equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the present invention, should still fall within the scope of this patent. category. In addition, the technical features and technical features, technical features and technical solutions, and technical solutions and technical solutions in the present invention can be used in free combination.

Claims (10)

1. A packer expansion type expansion tube subsidy tool is characterized in that, the packer expansion type expansion tube subsidy tool comprises an inner expansion device and an outer expansion tube (7) provided inside and outside, and the inner expansion device Contains a packer and a central pipe (5) connected in sequence, the length of the packer is less than the length of the outer expansion tube (7), the packer contains a rubber cartridge (3), when the packer After the rubber tube (3) expands, the outer expansion tube (7) can be expanded. 2. The packer expandable expansion tube patching tool according to claim 1, characterized in that, the packer also contains an upper joint (2), an inner pipe and a lower joint (4) connected in sequence, and the rubber cartridge (3) Sleeved on the outside of the inner pipe, when pressing into the packer, the rubber sleeve (3) of the packer can expand. 3. The packer expandable expansion pipe patching tool according to claim 2, characterized in that, the packer is in an upright state, and 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 sheathed 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). 4. The packer expandable expansion tube subsidizing tool according to claim 1, characterized in that, the internal expansion device also contains a positioning well gauge (1) and a limit joint (6), and the positioning well gauge ( 1), the packer, the center pipe (5) and the limit joint (6) are connected in sequence. 5. The packer expandable expansion tube subsidizing tool according to claim 4, characterized in that the outer expansion tube (7) is in an upright state, and the positioning well gauge (1) is located outside the upper end of the outer expansion tube (7). , the limit joint (6) is located in the lower end of the outer expansion tube (7), and the limit joint (6) and the outer expansion tube (7) are connected by shear pins (10). 6. The packer expandable expansion tube patching tool according to claim 5, characterized in that, the length of the packer is less than the length of the center tube (5), and the lower end of the outer expansion tube (7) is in contact with the stop The lower end of the joint (6) is flush, and the upper end of the outer expansion tube (7) is flush with the upper end of the rubber tube (3). 7. The packer expandable expansion tube subsidizing tool according to claim 5, characterized in that, the outer expansion tube (7) is sequentially sleeved with a first suspension rubber tube (8), a first sealing Hang rubber tube (9), the second seal hangs rubber tube (11) and the second hangs rubber tube (12). 8. The packer expandable expansion tube subsidy tool according to claim 7, characterized in that, the first hanging rubber tube (8) and the second hanging rubber tube (12) are arranged symmetrically up and down, and the first sealing hanging rubber tube (9) is symmetrically arranged up and down with the second sealing hanging rubber tube (11), and the length of the first hanging rubber tube (8) is equal to the length of the first sealing hanging rubber tube (9). 9. The packer expandable expansion tube fitting tool according to claim 8, characterized in that, the first hanging rubber tube (8) is identical to the second hanging rubber tube (12), and the first sealing hanging rubber tube ( 9) It is exactly the same as the second sealing hanging rubber cylinder (11), the outer surface of the first hanging rubber cylinder (8) is provided with drainage grooves, and the length of the rubber cylinder (3) is 1 of the length of the first hanging rubber cylinder (8). times to 2 times. 10. The packer expandable expansion tube patching tool according to claim 9, characterized in that, the rubber sleeve (3) of the packer is in clearance fit with the external expansion tube (7), and the internal expansion device can Relative to the axial movement of the outer expansion tube (7), the rubber sleeve (3) of the packer can expand the outer expansion tube (7) segmentally and sequentially until fully expanded.