A device for simultaneously lowering multiple packers and a lowering method thereof

Abstract

The present invention is a device for lowering multiple packers at the same time and a lowering method thereof. The lowering tool body comprises a retention bottom barrel, and the retention bottom barrel is provided with multiple lowering assemblies. Each lowering assembly comprises a release mechanism and a packer assembly pipe. The uppermost lowering assembly is connected with a connecting piece, and a release mechanism is also provided between the connecting piece and the lowering assembly. The retention bottom barrel is provided with a first inner barrel, and the bottom of the first inner barrel is provided with a retention ring plate. The lower end of the first inner barrel is provided with a bottom barrel lower ball seat, and the upper end is provided with a bottom barrel upper ball seat. The side wall of the retention bottom barrel is provided with a retention bottom barrel flow hole corresponding to the bottom barrel lower ball seat and the bottom barrel upper ball seat. The lowering assembly is provided with a second inner barrel, and the upper end of the second inner barrel of the packer assembly pipe is provided with a lowering assembly ball seat, and the side wall of the packer assembly pipe is provided with an assembly pipe flow hole corresponding to the lowering assembly ball seat. The outer wall of the retention bottom barrel and the outer wall of the packer assembly pipe are provided with a plurality of sealing rings. The present invention can realize the lowering of multiple packers and complete downhole seating and anchoring.

Description

Technical Field

[0001] The invention relates to the technical field of packer delivery tools in oil production, and in particular to a device for simultaneously lowering a plurality of packers and a lowering method thereof. Background Art

[0002] In the oil industry, downhole packers are an indispensable downhole stratification equipment for downhole sealing operations. Currently, there are various types of downhole packers and various ways of lowering them, but for packers that need to be independently seated and anchored, they can usually only be lowered individually, and it is necessary to repeatedly raise and lower the pipe string to complete the seating and anchoring of multiple packers. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and to provide a device for simultaneously lowering multiple packers and a lowering method thereof for realizing the operation of simultaneously lowering multiple packers that require independent sealing and anchoring and completing the sealing and anchoring.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A device for lowering multiple packers simultaneously, comprising a lowering tool body, the lowering tool body comprising a retention bottom barrel, the retention bottom barrel being provided with multiple lowering assemblies, each lowering assembly comprising a release mechanism and a packer assembly pipe connected to the top of the release mechanism, the release mechanism of the upper lowering assembly of two adjacent lowering assemblies being connected to the packer assembly pipe of the lower lowering assembly, the release mechanism of the lowermost lowering assembly being connected to the retention bottom barrel, the uppermost lowering assembly being connected to a connecting piece, and a release mechanism also being provided between the connecting piece and the lowering assembly;

[0006] The said interception bottom cylinder is provided with a first inner cylinder and a interception ring plate is provided at the bottom of the first inner cylinder, a bottom cylinder lower ball seat is provided at the lower end of the said first inner cylinder and an upper bottom cylinder ball seat is provided at the upper end, and the said interception bottom cylinder side wall is provided with interception bottom cylinder flow holes corresponding to the bottom cylinder lower ball seat and the bottom cylinder upper ball seat;

[0007] A second inner cylinder is provided in the lowering assembly, a lowering assembly ball seat is provided at the upper end of the second inner cylinder of the packer assembly pipe, and an assembly pipe flow hole is provided on the side wall of the packer assembly pipe corresponding to the lowering assembly ball seat;

[0008] A plurality of sealing rings are provided on the outer wall of the interception bottom cylinder and the outer wall of the packer assembly pipe of the lowering assembly;

[0009] The several packers to be lowered are sequentially installed at the connection between the interception bottom barrel and the release mechanism of the lowest lowering assembly, the connection between two adjacent lowering assemblies, and the connection between the highest lowering assembly and the release mechanism under the connector.

[0010] The release mechanism includes a release seat, a spring claw is provided on the bottom circumference of the release seat, a slider mounting seat is provided below the spring claw, the slider mounting seat is fixed on a connecting component corresponding to the release mechanism, a slider is installed on the upper end of the inner side wall of the slider mounting seat by shear nails, the upper end of the slider is located on the inner side of the spring claw, and an injection hole is provided on the side wall of the second inner cylinder of the release seat at a position corresponding to the spring claw.

[0011] The upper end of the inner wall of the packer to be lowered is engaged with the spring claw.

[0012] The lower ball seat of the base tube, the upper ball seat of the base tube, and the ball seat of the lowering assembly are all connected to corresponding connecting parts through intercepting shear nails.

[0013] The lower ball seat of the bottom tube, the upper ball seat of the bottom tube, and the ball seat of the lower assembly are all provided with a retaining inner hole for retaining the steel ball, and the retaining inner hole is a structure that is wide at the top and narrow at the bottom.

[0014] The top of the connector is connected with an oil pipe, and the top of the connector is provided with a connecting thread for connecting with the oil pipe.

[0015] The method for lowering the device for lowering multiple packers simultaneously comprises the following specific steps:

[0016] S1, docking and assembling a plurality of packers to be lowered with each release mechanism of a lowering tool body into a lowering string;

[0017] S2. The connector on the upper end of the lowering tool body is connected to the oil pipe, and the packer is carried along the oil pipe into the predetermined sealing position of the casing;

[0018] S3. Complete the pipe column sealing by manually throwing the steel ball for sealing, start pressurizing the pipe, and complete the independent sealing and anchoring of multiple packers and casings at the same time;

[0019] S4. After the packer is seated, each packer and the release mechanism are independently unlocked by throwing balls one by one. After the release is completed, the lowering tool body can be lifted out by lifting the pipe string, completing the recovery of the lowering tool body.

[0020] In step S4, the process of independent release and unlocking of each packer and the release mechanism is as follows: pressurizing through the injection hole, the shear pins at the slider are broken, the slider descends, and the claws are recovered to achieve unlocking from the packer.

[0021] The beneficial effects of the present invention are as follows: the present invention utilizes a special lowering tool body, through ball dropping and pressure transmission in a pipe, to lower multiple packers and complete downhole sealing and anchoring, and can achieve downhole separation of the lowering tool body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the lowering tool body;

[0023] Figure 2 is a schematic diagram of one of the release mechanisms;

[0024] Figure 3 It is a schematic diagram of the connection between the lowering tool body and multiple packers;

[0025] Figure 4 It is a schematic diagram of multiple packers being lowered and sealed;

[0026] Figure 5 This is a schematic diagram after the packer seat is sealed;

[0027] In the figure: 1-retained bottom cylinder; 2-release mechanism; 3-packer assembly pipe; 4-connector; 5-first inner cylinder; 6-retained ring plate; 7-bottom cylinder lower ball seat; 8-bottom cylinder upper ball seat; 9-retained bottom cylinder flow hole; 10-second inner cylinder; 11-lowering assembly ball seat; 12-assembly pipe flow hole; 13-sealing ring; 14-packer; 15-release seat; 16-claw; 17-slider mounting seat; 18-shear nail; 19-slider; 20-injection hole; 21-steel ball; 22-oil pipe; 23-casing;

[0028] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] like Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, a device for lowering multiple packers simultaneously comprises a lowering tool body, the lowering tool body comprises a retention bottom barrel 1, the retention bottom barrel 1 is provided with multiple lowering assemblies, each lowering assembly comprises a release mechanism 2 and a packer assembly pipe 3 connected to the top of the release mechanism 2, the release mechanism 2 of the upper lowering assembly of two adjacent lowering assemblies is connected to the packer assembly pipe 3 of the lower lowering assembly, the release mechanism 2 of the lowermost lowering assembly is connected to the retention bottom barrel 1, the uppermost lowering assembly is connected to a connector 4, and a release mechanism 2 is also provided between the connector 4 and the lowering assembly;

[0031] The said interception bottom cylinder 1 is provided with a first inner cylinder 5 and a interception ring plate 6 is provided at the bottom of the first inner cylinder 5, a bottom cylinder lower ball seat 7 is provided at the lower end of the said first inner cylinder 5 and a bottom cylinder upper ball seat 8 is provided at the upper end, and interception bottom cylinder flow holes 9 are provided on the side wall of the said interception bottom cylinder 1 corresponding to the bottom cylinder lower ball seat 7 and the bottom cylinder upper ball seat 8;

[0032] A second inner tube 10 is provided in the lowering assembly, a lowering assembly ball seat 11 is provided at the upper end of the second inner tube 10 of the packer assembly pipe 3, and an assembly pipe flow hole 12 is provided on the side wall of the packer assembly pipe 3 corresponding to the lowering assembly ball seat 11;

[0033] A plurality of sealing rings 13 are provided on the outer wall of the interception bottom cylinder 1 and the outer wall of the packer assembly pipe 3 of the lowering assembly;

[0034] The several packers 14 to be lowered are sequentially installed at the connection between the trapped bottom cylinder 1 and the release mechanism 2 of the lowest lowering assembly, the connection between two adjacent lowering assemblies, and the connection between the highest lowering assembly and the release mechanism 2 under the connector 4.

[0035] The release mechanism 2 can adopt various release tools commonly used in the art, such as Figure 2 As shown, the release mechanism 2 includes a release seat 15, a spring claw 16 is provided on the bottom circumference of the release seat 15, a slider mounting seat 17 is provided below the spring claw 16, the slider mounting seat 17 is fixed on a connecting component corresponding to the release mechanism 2, a slider 19 is installed on the upper end of the inner wall of the slider mounting seat 17 through a shear nail 18, the upper end of the slider 19 is located on the inner side of the spring claw 16, and a pressure injection hole 20 is provided on the side wall of the second inner cylinder 10 of the release seat 15 corresponding to the spring claw 16.

[0036] The upper end of the inner wall of the packer 14 to be lowered is engaged with the spring claw 16 .

[0037] The bottom cylinder lower ball seat 7, the bottom cylinder upper ball seat 8, and the lowering assembly ball seat 11 are all connected to corresponding connecting parts through intercepting shear nails.

[0038] The lower ball seat 7 of the bottom tube, the upper ball seat 8 of the bottom tube, and the lower assembly ball seat 11 are all provided with a retaining inner hole for retaining the steel ball 21, and the retaining inner hole is a structure that is wide at the top and narrow at the bottom.

[0039] The top of the connector 4 is connected to an oil pipe 22 , and a connecting thread for connecting with the oil pipe 22 is provided on the top of the connector 4 .

[0040] The method for lowering the device for lowering multiple packers simultaneously comprises the following specific steps:

[0041] S1, docking and assembling a plurality of packers 14 to be lowered with each release mechanism 2 of the lowering tool body into a running string;

[0042] S2, the connector 4 at the upper end of the lowering tool body is connected to the oil pipe 22, and the packer 14 is carried along the oil pipe 22 and lowered into the predetermined sealing position of the casing 23;

[0043] S3, the pipe column is sealed by manually throwing the steel ball 21 for sealing, and the internal pressure of the pipe is increased, and the independent sealing and anchoring of multiple packers 14 and casing 23 are completed at the same time;

[0044] S4. After the packer 14 is seated, each packer 14 is independently unlocked from the release mechanism 2 by throwing balls one by one. After the release is completed, the lowering tool body can be lifted out by lifting the pipe string, thereby completing the recovery of the lowering tool body.

[0045] In step S4 , the process of independent unlocking of each packer 14 and the release mechanism 2 is as follows: pressurizing through the injection hole 20 , the shear pins 18 at the slider 19 break, the slider 19 descends, and the claws 16 are recovered to achieve unlocking from the packer 14 .

[0046] The present invention utilizes a special lowering tool body, and through ball dropping and pressure transmission in a pipe, multiple packers are lowered and downhole sealing and anchoring are completed, and the lowering tool body can be separated downhole.

[0047] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A device for simultaneously lowering multiple packers, characterized in that: The tool comprises a lowering tool body, the lowering tool body comprises a retention bottom barrel (1), the retention bottom barrel (1) is provided with a plurality of lowering components, each lowering component comprises a release mechanism (2) and a packer assembly pipe (3) connected to the top of the release mechanism (2), the release mechanism (2) of the upper lowering component of two adjacent lowering components is connected to the packer assembly pipe (3) of the lower lowering component, the release mechanism (2) of the lower lowering component is connected to the retention bottom barrel (1), the uppermost lowering component is connected to a connecting piece (4), and a release mechanism (2) is also provided between the connecting piece (4) and the lowering component; The interception bottom cylinder (1) is provided with a first inner cylinder (5) and a interception ring plate (6) is provided at the bottom of the first inner cylinder (5); a bottom cylinder lower ball seat (7) is provided at the lower end of the first inner cylinder (5) and a bottom cylinder upper ball seat (8) is provided at the upper end; and interception bottom cylinder flow holes (9) are provided on the side wall of the interception bottom cylinder (1) corresponding to the bottom cylinder lower ball seat (7) and the bottom cylinder upper ball seat (8); A second inner tube (10) is provided in the lowering assembly, a lowering assembly ball seat (11) is provided at the upper end of the second inner tube (10) of the packer assembly tube (3), and an assembly tube flow hole (12) is provided on the side wall of the packer assembly tube (3) corresponding to the lowering assembly ball seat (11); A plurality of sealing rings (13) are provided on the outer wall of the interception bottom cylinder (1) and on the outer wall of the packer assembly pipe (3) of the lowering assembly; A plurality of packers (14) to be lowered are sequentially installed at the connection between the interception bottom barrel (1) and the release mechanism (2) of the lowest lowering assembly, at the connection between two adjacent lowering assemblies, and at the connection between the highest lowering assembly and the release mechanism (2) under the connecting piece (4); The release mechanism (2) comprises a release seat (15), a spring claw (16) is provided on the circumference of the bottom of the release seat (15), a slider mounting seat (17) is provided below the spring claw (16), the slider mounting seat (17) is fixed on a connecting component corresponding to the release mechanism (2), a slider (19) is mounted on the upper end of the inner wall of the slider mounting seat (17) via a shear nail (18), the upper end of the slider (19) is located on the inner side of the spring claw (16), and a pressure injection hole (20) is provided on the side wall of the second inner cylinder (10) of the release seat (15) at a position corresponding to the spring claw (16).

2. A device for simultaneously lowering multiple packers according to claim 1, characterized in that: The upper end of the inner wall of the packer (14) to be lowered is clamped with the spring claw (16).

3. A device for simultaneously lowering multiple packers according to claim 2, characterized in that: The bottom cylinder lower ball seat (7), the bottom cylinder upper ball seat (8), and the lowering assembly ball seat (11) are all connected to corresponding connection components via retained shear nails.

4. A device for simultaneously lowering multiple packers according to claim 3, characterized in that: The bottom cylinder lower ball seat (7), the bottom cylinder upper ball seat (8), and the lower assembly ball seat (11) are all provided with a retaining inner hole for retaining the steel ball (21), and the retaining inner hole is a structure that is wide at the top and narrow at the bottom.

5. A device for simultaneously lowering multiple packers according to claim 4, characterized in that: The top of the connecting piece (4) is connected to an oil pipe (22), and the top of the connecting piece (4) is provided with a connecting thread for connecting to the oil pipe (22).

6. A method for lowering a device for lowering a plurality of packers simultaneously as claimed in claim 5, characterized in that: The specific steps are: S1, docking a plurality of packers (14) to be lowered with each release mechanism (2) of a lowering tool body to form a lowering string; S2, the connecting piece (4) at the upper end of the lowering tool body is connected to the oil pipe (22), and the packer (14) is carried along the oil pipe (22) and lowered into the predetermined sealing position of the casing (23); S3, completing the sealing of the pipe column by manually throwing a steel ball (21) for sealing, starting to increase the pressure in the pipe, and completing the independent sealing and anchoring of multiple packers (14) and casings (23) at the same time; S4. After the packer (14) is seated, each packer (14) is independently unlocked from the release mechanism (2) by throwing balls one by one. After the release is completed, the tubing string can be lifted up to lift out the lowering tool body, thereby completing the recovery of the lowering tool body.

7. A lowering method according to claim 6, characterized in that: In step S4, the process of independently releasing and unlocking each packer (14) from the release mechanism (2) is as follows: pressurizing through the injection hole (20), the shear pins (18) at the slider (19) are broken, the slider (19) descends, and the claws (16) are recovered, thereby achieving unlocking from the packer (14).

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