Novel variable-diameter oil and gas well tool pipe string capable of preventing drill jamming

Abstract

The utility model belongs to the technical field of oil and gas wells, and particularly relates to a novel variable-diameter anti-jamming oil and gas well tool pipe string which comprises a connector, a safety short section, a stabilizer, a hydraulic jet tool, a balance valve, an orbital transfer packer, a coupling positioner and a guide short section which are in threaded connection from top to bottom. A step shaft is arranged at the upper end of the first center rod, the upper cone, the rubber sleeve and the lower cone are sequentially arranged at the upper end of the first center rod in a sleeved mode, the upper cone is provided with an upper protective sleeve, the upper cone and the upper protective sleeve are connected through a first shear pin, the lower cone is provided with a lower protective sleeve, and the lower cone and the lower protective sleeve are connected through a second shear pin. When the sleeve is deformed, the sleeve is clamped, the first shear pin and the second shear pin are lifted up and cut off by shearing force, so that the pipe string can smoothly pass through the deformed sleeve, the first shear pin, the second shear pin, the upper sheath and the lower sheath can be reused and replaced, the maintenance is convenient, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas well technical field, concretely relates to a novel variable diameter anti-stuck oil and gas well tool pipe string. BACKGROUND

[0002] The oil and gas well tool pipe string is a combination of a series of tools used in oil and gas well operations, which are connected in series through connecting pipes or other connection methods to form an overall system for completing specific downhole operation tasks. The patent with publication number CN211287654U discloses an oil and gas well continuous layering fracturing, acidizing, water injection and leak finding tool pipe string, which includes connectors, safety sub, first stabilizer, hydraulic jetting tool, second stabilizer, pressure relief valve, stepless variable track packer, depth calibration sub, guide sub connected in sequence on coiled tubing, oil pipe and drill pipe. The stepless variable track packer includes upper retainer, lower cone, sealing rubber tube, anchoring device, powerful elastic support device, center rod with stepless variable track guide rail, reversing pin and bottom joint. The stepless variable track packer can realize continuous stepless variable track. The tool pipe string can complete full-well layering fracturing, layering acidizing, water injection and leak finding in one well, improve operation efficiency, reduce overall operation time and reduce operation risk and cost. During fracturing construction, casing deformation easily occurs, which can cause the tool pipe string to be stuck, and the packer is an important tool in fracturing construction, with the largest outer diameter size, which causes the tool pipe string to be unable to be smoothly pulled out, affecting construction efficiency. SUMMARY

[0003] Therefore, the utility model wants to solve the problem of casing deformation easily occurring during fracturing construction in the prior art, which can cause the tool pipe string to be stuck, and the tool pipe string to be unable to be smoothly pulled out, affecting construction efficiency.

[0004] To this end, the technical scheme adopted is that the utility model discloses a novel variable diameter anti-stuck oil and gas well tool pipe string, which comprises connectors, safety sub, stabilizer, hydraulic jetting tool, balance valve, variable track packer, coupling positioner and guide sub connected in thread from top to bottom. The variable track packer comprises a first center rod, a stepped shaft is arranged at the upper end of the first center rod, an upper cone, a rubber tube and a lower cone are sequentially sleeved on the upper end of the first center rod, an upper protective sleeve is arranged on the upper cone, the upper cone and the upper protective sleeve are connected through a first shear pin, a lower protective sleeve is arranged on the lower cone, and the lower cone and the lower protective sleeve are connected through a second shear pin.

[0005] Preferably, the lower end of the first center rod is threadedly connected with a lower joint.

[0006] Preferably, the first center rod is sleeved with a friction block body, the friction block body is provided with a groove, the outer side of the groove is provided with a friction block, the inner side of the friction block is provided with a first arc spring, the two sides of the friction block body are respectively provided with a first limiting ring, the upper end of the friction block body is threadedly connected with a first limiting tube, and the lower end of the friction block body is threadedly connected with a second limiting tube.

[0007] Preferably, the lower end of the friction block body is provided with a reversing ring, the inner side of the reversing ring is provided with a reversing pin, the outer wall of the first center rod is alternately provided with a long groove and a short groove, the lower ends of the long groove and the short groove are communicated through a Y-shaped groove, and the reversing pin slides in the long groove, the short groove and the Y-shaped groove.

[0008] Preferably, the first center rod is sleeved with a slip seat between the lower cone and the first limiting tube, the lower end of the slip seat is threadedly connected with the first limiting tube, the outer side of the slip seat is provided with a slip, the slip is connected between the slip seat and the slip through a spring, the lower end of the slip is clamped in the first limiting tube, a gap is formed between the upper end of the slip and the lower cone, the slip is sleeved with a slip ring, and the slip ring is connected with the slip seat.

[0009] Preferably, the first center rod is provided with a hollow channel, and the outer wall of the first center rod is provided with a cleaning port.

[0010] Preferably, the coupling positioner comprises a second center rod, a positioning claw is sleeved on the second center rod, a second arc spring is arranged on the inner side of the positioning claw, a first sleeve is arranged on the upper end of the positioning claw, a first limiting sleeve is threadedly connected on the first sleeve, a second sleeve is arranged on the lower end of the positioning claw, a second limiting sleeve is threadedly connected on the second sleeve, a diameter-reducing groove extending in the axial direction is arranged on the outer wall of the second center rod close to the second sleeve, and the second sleeve and the second center rod are connected through a third shear pin.

[0011] The technical scheme of the utility model has the following advantages: the sleeve is clamped, the first shear pin and the second shear pin are cut by the shearing force and are lifted, so that the pipe string can smoothly pass through the deformed sleeve, and the first shear pin, the second shear pin, the upper protective sleeve and the lower protective sleeve can be replaced for reuse, maintenance is convenient, and the construction efficiency is improved.

[0012] Other features and advantages of the present utility model will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the present utility model. The objects and other advantages of the present utility model can be realized and achieved by means of the structures particularly pointed out in the written description and accompanying drawings.

[0013] The technical scheme of the utility model will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are used to provide further understanding of the present application, and form a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0015] Figure 1 is a structural schematic view of the present application;

[0016] Figure 2 is a half cutaway structural schematic view of the orbit-changing packer in the present application;

[0017] Figure 3 is a structural schematic view of the first center rod in the present application;

[0018] Figure 4 is a structural schematic view of the coupling positioner in the present application;

[0019] Figure 5 is a half cutaway structural schematic view of the coupling positioner in the present application;

[0020] In the drawings, 1 is a connector; 2 is a safety nipple; 3 is a stabilizer; 4 is a hydraulic jet tool; 5 is a balance valve; 6 is an orbit-changing packer; 7 is a coupling positioner; 8 is a guide nipple; 601 is a first center rod; 602 is a stepped shaft; 603 is an upper cone; 604 is a rubber sleeve; 605 is a lower cone; 606 is an upper sheath; 607 is a first shear pin; 608 is a lower sheath; 609 is a second shear pin; 610 is a lower joint; 611 is a friction block body; 612 is a groove; 613 is a friction block; 614 is a first arc spring; 615 is a first limiting ring; 616 is a first limiting tube; 617 is a second limiting tube; 618 is a reversing ring; 619 is a reversing pin; 620 is a long groove; 621 is a short groove; 622 is a Y-shaped groove; 623 is a slip seat; 624 is a slip; 625 is a spring; 626 is a slip ring; 627 is a hollow passage; 628 is a cleaning port; 701 is a second center rod; 702 is a positioning claw; 703 is a second arc spring; 704 is a first sleeve; 705 is a first limiting sleeve; 706 is a second sleeve; 707 is a second limiting sleeve; 708 is a reduced diameter groove; and 709 is a third shear pin. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] This utility model provides a novel variable-diameter anti-sticking oil and gas well tool string, such as... Figures 1-5 As shown, it includes: a connector 1, a safety sub 2, a stabilizer 3, a water jet tool 4, a balance valve 5, a track changer packer 6, a coupling positioner 7, and a guide sub 8, all threaded from top to bottom. The track changer packer 6 includes: a first center rod 601, with a stepped shaft 602 at the upper end of the first center rod 601. The first center rod 601 and the balance valve 5 are threaded together. An upper cone 603, a rubber sleeve 604, and a lower cone 605 are sequentially fitted onto the upper end of the first center rod 601. An upper sheath 606 is provided on the upper cone 603, and the upper cone 603 and the upper sheath 606 are connected by a first shear pin 607. A lower sheath 608 is provided on the lower cone 605, and the lower cone 605 and the lower sheath 608 are connected by a second shear pin 609. The tool string is installed inside the casing for fracturing, delamination acidizing, water injection, or leak detection. Patent CN211287654U describes the specific structure and function of connector 1, safety sub 2, stabilizer 3, hydraulic jetting tool 4, and guide sub 8, and also describes the construction process and working principle of the tool string, which will not be repeated here. The balancing valve 5 is used to actively balance the pressure at the upper and lower ends to ensure operational safety. Before removing the packer, the balancing valve connects the pressure at the upper and lower ends of the packer to prevent damage to the rubber sleeve due to excessive pressure difference during unsealing.

[0026] The working principle and beneficial technical effects of the above technical solution are: the position of the maximum radial dimension of the whole variable gauge packer 6 is at the upper cone 603 and the lower cone 605, when the casing is deformed, if the casing deformation position is stuck with the upper cone 603 and cannot pass, the pipe string cannot be pulled out, with the pulling up of the pipe string, the shear force between the upper cone 603 and the upper sleeve 606 becomes larger and larger, until the first shear nail 607 is sheared, the upper cone 603 can continue to be pulled up with the pipe string, and the upper cone 603 and the upper sleeve 606 are separated, since the upper sleeve 606 is a thin-walled structure, the equivalent diameter becomes smaller, and the casing deformation position is passed smoothly. Similarly, if the casing is stuck at the cone 605 and the lower sleeve 608, the second shear nail 609 will also be sheared by the shear force, so that the pipe string can pass through the deformed casing smoothly, and the shear nail and the sleeve can be replaced again, which is convenient for maintenance and improves the construction efficiency.

[0027] In one embodiment, the lower end of the first central rod 601 is threadedly connected with the lower joint 610, and the upper end of the first central rod 601 is threadedly connected with the upper end of the balance valve 5, facilitating installation and disassembly. A friction block body 611 is sleeved on the first central rod 601, a recess 612 is arranged on the friction block body 611, a friction block 613 is arranged outside the recess 612, a first arc spring 614 is arranged inside the friction block 613, first limit rings 615 are arranged on both sides of the friction block 613 on the friction block body 611, a first limit tube 616 is threadedly connected with the upper end of the friction block body 611, and a second limit tube 617 is threadedly connected with the lower end of the friction block body 611. A reversing ring 618 is arranged at the lower end of the friction block body 611, a reversing pin 619 is arranged inside the reversing ring 618, long grooves 620 and short grooves 621 are arranged alternately on the outer wall of the first central rod 601, the lower ends of the long grooves 620 and the short grooves 621 are communicated through a Y-shaped groove 622, and the reversing pin 619 slides in the long grooves 620, the short grooves 621 and the Y-shaped groove 622. A slip seat 623 is sleeved on the first central rod 601 between the lower cone 605 and the first limit tube 616, the lower end of the slip seat 623 is threadedly connected with the first limit tube 616, slips 624 are arranged outside the slip seat 623, the slip seat 623 and the slips 624 are connected through springs 625, the lower end of each slip 624 is clamped in the first limit tube 616, a gap is arranged between the upper end of each slip 624 and the lower cone 605, each slip 624 is sleeved with a slip ring 626, and the slip ring 626 is connected with the slip seat 623. A hollow channel 627 is arranged in the first central rod 601, a cleaning port 628 is arranged on the outer wall of the first central rod 601, and the hollow channel 627 is communicated with the cleaning port 628. After the construction is completed, sand will be left in the tool, and the sand will be carried away by the water flowing through the hollow channel 627 and the cleaning port 628 through pumping of the cleaning fluid, so as to play a cleaning role.

[0028] The working principle and beneficial technical effects of the above technical solution are: in the process of moving downward, the variable track packer 6 is provided with elastic force by the first arc spring 614, so that the friction block 613 extends outward to generate friction with the inner wall of the casing, but can move downward along the casing; when the position of construction sealing is required to be moved, the first center rod 601 is lifted and then lowered, and the reversing pin 619 slides along the short groove 621, the Y-shaped groove 622 and the long groove 620, so that the reversing pin 619 slides from the short groove 621 into the long groove 620, the first center rod 601 can move more displacement downward relative to the slip 624, so that the lower cone 605 is inserted into the slip 624, the slip 624 rotates around the slip ring 626, the slip 624 is expanded, the radius of the slip 624 is increased, the teeth on the slip 624 are clamped on the inner wall of the casing to complete the sealing, at the same time, the upper cone 603 moves downward along the first center rod 601, the rubber cylinder 604 is extruded, the radius is increased and is attached to the inner wall of the casing to further seal and improve the sealing performance. When unsealing is required, the first center rod 601 is lifted, the rubber cylinder 604 is restored, the spring 625 provides elastic force to make the slip 624 retract, so that the sealing is released, and the pipe string is moved downward, the reversing pin 619 is switched from the long groove 620 to the short groove 621, the lower cone 605 cannot be inserted into the slip 624, the teeth of the slip 624 cannot be clamped on the inner wall of the casing, and the pipe string can continue to move, which is convenient for construction and has high efficiency.

[0029] In one embodiment, the coupling locator 7 comprises: a second center rod 701, a positioning claw 702 is sleeved on the second center rod 701, a second arc spring 703 is arranged on the inner side of the positioning claw 702, a first casing 704 is arranged on the upper end of the positioning claw 702, a first limiting sleeve 705 is threadedly connected on the first casing 704, a second casing 706 is arranged on the lower end of the positioning claw 702, a second limiting sleeve 707 is threadedly connected on the second casing 706, a diameter-reducing groove 708 extending in the axial direction is arranged on the outer wall of the second center rod 701 close to the second casing 706, and the second casing 706 and the second center rod 701 are connected through a third shear pin 709. The positioning claw 702 is clamped into the interval between the two casings through the elastic force of the second arc spring 703, so that when the pipe string is lifted, there is a certain tonnage fluctuation when the positioning claw 702 passes through the gap of the casing each time, and the depth is calibrated by comparing the depth of tonnage fluctuation with the actual coupling depth to position the depth of the pipe string.

[0030] The working principle and beneficial technical effects of the above technical solution are as follows: if the sleeve deforms, the positioning claw 702 cannot be retracted in time, and there is a risk of sticking the drill, the first sleeve 704, the first limiting sleeve 705, the positioning claw 702, the second limiting sleeve 707 and the second sleeve 706 are connected together and sleeved on the second center rod 701, and are fixed on the second center rod 701 through the third shear pin 709, when the second center rod 701 is lifted, if the positioning claw 702 cannot be retracted in time and the lifting tonnage is too large, only the third shear pin 709 needs to be cut off, and the second center rod 701 can move upward, the second arc spring 703 falls into the reduced-diameter groove 708, the spring loses the action of restoring the shape, the positioning claw 702 retracts, and the function of preventing the drill from being stuck is achieved.

[0031] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Therefore, if these modifications and variations of the present application belong to the scope of the claims of the present application and the equivalent technology, the present application also intends to include these modifications and variations.

Claims

1. A novel variable-gauge, anti-stuck oil and gas well tool pipe string, characterized in that, The utility model relates to a downhole tool, which comprises a connector (1), a safety short section (2), a stabilizer (3), a hydraulic jet tool (4), a balance valve (5), a variable track packer (6), a coupling positioner (7) and a guide short section (8) connected from top to bottom, and the variable track packer (6) comprises a first central rod (601), a stepped shaft (602) arranged at the upper end of the first central rod (601), an upper cone (603), a rubber sleeve (604) and a lower cone (605) sequentially sleeved on the upper end of the first central rod (601), an upper protective sleeve (606) arranged on the upper cone (603), the upper cone (603) and the upper protective sleeve (606) connected through a first shear pin (607), a lower protective sleeve (608) arranged on the lower cone (605), and the lower cone (605) and the lower protective sleeve (608) connected through a second shear pin (609). The lower end of the first central rod (601) is threadedly connected with a lower joint (610).

2. A novel variable-gauge anti-stuck oil and gas well tool pipe string according to claim 1, characterized in that, The first central rod (601) is sleeved with a friction block body (611), the friction block body (611) is provided with a groove (612), the outer side of the groove (612) is provided with a friction block (613), the inner side of the friction block (613) is provided with a first arc spring (614), the first central rod (611) is provided with a first limiting ring (615) on both sides of the friction block (613), the upper end of the friction block body (611) is threadedly connected with a first limiting tube (616), and the lower end of the friction block body (611) is threadedly connected with a second limiting tube (617).

3. A new variable-gauge anti-stuck oil and gas well tool pipe string according to claim 1, characterized in that, The lower end of the friction block body (611) is provided with a reversing ring (618), the inner side of the reversing ring (618) is provided with a reversing pin (619), the outer wall of the first central rod (601) is alternately provided with a long groove (620) and a short groove (621), the lower ends of the long groove (620) and the short groove (621) are communicated through a Y-shaped groove (622), and the reversing pin (619) slides in the long groove (620), the short groove (621) and the Y-shaped groove (622).

4. A novel variable-gauge anti-kick tools pipe string for oil and gas wells according to claim 3, characterized in that, The first central rod (601) is sleeved with a slip seat (623) between the lower cone (605) and the first limiting tube (616), the lower end of the slip seat (623) is threadedly connected with the first limiting tube (616), the outer side of the slip seat (623) is provided with a slip (624), the slip seat (623) and the slip (624) are connected through a spring (625), the lower end of the slip (624) is clamped in the first limiting tube (616), a gap is arranged between the upper end of the slip (624) and the lower cone (605), the slip (624) is sleeved with a slip ring (626), and the slip ring (626) is connected with the slip seat (623).

5. A novel variable-gauge anti-kick tools pipe string for oil and gas wells according to claim 3, characterized in that, The first central rod (601) is provided with a hollow channel (627), and the outer wall of the first central rod (601) is provided with a cleaning port (628); the hollow channel (627) and the cleaning port (628) are communicated.

6. A new variable-gauge anti-stuck oil and gas well tool pipe string according to claim 1, characterized in that, ​ 7. A new variable-gauge anti-stuck oil and gas well tool pipe string according to claim 1, characterized in that, The coupling locator (7) comprises a second center rod (701), a positioning claw (702) sleeved on the second center rod (701), a second arc spring (703) arranged in the inside of the positioning claw (702), a first sleeve (704) arranged on the upper end of the positioning claw (702), a first limiting sleeve (705) threadedly connected on the first sleeve (704), a second sleeve (706) arranged on the lower end of the positioning claw (702), a second limiting sleeve (707) threadedly connected on the second sleeve (706), and a diameter-reducing groove (708) extending in the axial direction and arranged on the outer wall of the second center rod (701) and close to the second sleeve (706), wherein the second sleeve (706) and the second center rod (701) are connected through a third shear pin (709).

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