A packer release device

Abstract

The present invention relates to the technical field of hydraulic fracturing, and in particular to a packer unblocking device, comprising a cylinder, one side of the cylinder is threadedly connected with a connecting pipe, the side of the connecting pipe away from the cylinder is connected with a connecting head, the outer wall of the connecting head is provided with a threaded layer, the cylinder is provided with an annular opening, the inner walls on both sides of the annular opening are jointly fixedly connected with a plurality of connecting blocks, a closing component is provided in the cylinder, and the closing component includes a closing valve arranged in the cylinder. The device can timely block the packer, and after the packer is blocked, the high-pressure water flow will impact the closing valve to move right, so that the water outlet is aligned with the annular opening, and with the subsequent rotation of the water wheel, the closing valve is rotated, so that the high-pressure water flow can impact each position between the packer and the gap, so that all impurities such as stones can be completely washed away as much as possible.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic fracturing, and in particular to a packer release device. Background Art

[0002] A packer refers to a downhole tool connected to the downhole tubing and used to isolate the annular space between the oil pipe and the oil and gas well casing or the open hole well wall. When it is necessary to isolate the annular space between the oil pipe and the oil and gas well casing or the open hole well wall, the packer is connected to the downhole tubing. After it is lowered to the designed depth, the sealing components on the packer are expanded by hydraulic drive and other means to isolate the oil casing annulus.

[0003] During the oil production process, the packer is affected by the pressure difference and often has poor sealing effect. When the pressure of the packer is released, impurities such as soil or stones on the surrounding hole wall will enter between the packer and the hole wall, resulting in increased friction between the packer and the hole wall, and the packer is stuck in the cavity or blocked, leading to accidents. The existing technology uses a release device to deal with the packer. However, in the process of releasing the jam, it is necessary to use a high-pressure water flow to flush the sealing ball into the valve body to seal the valve body, and then use high pressure to The water flow will wash away the impurities such as stones between the packer and the hole wall. Since the position of the water outlet on the valve body is fixed during installation, some of the stones and other impurities may be washed away, while the other part is not removed, resulting in a poor effect of unblocking the packer. In addition, the sealing ball is flushed into the valve body for sealing using high-pressure water flow, which requires the sealing ball to be prepared in advance, which is rather troublesome, and there is no way to ensure that the sealing ball can quickly enter the valve body, resulting in the inability to close the valve body in time. Therefore, it is necessary to design a packer unblocking device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a release device for a packer is proposed. The device has a water wheel, a threaded rod and a threaded sleeve, so that when the high-pressure water flow flows, the sealing ball can automatically enter the closing valve, thereby sealing the packer in time, and after the packer is sealed, the high-pressure water flow will impact the closing valve to move right, so that the water outlet is aligned with the annular opening, and with the subsequent rotation of the water wheel, the closing valve rotates, so that the high-pressure water flow can impact each position between the packer and the gap, so as to completely wash away all impurities such as stones as much as possible.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A packer release device comprises a cylinder, one side of the cylinder is threadedly connected with a connecting pipe, the side of the connecting pipe away from the cylinder is connected with a connecting head, the outer wall of the connecting head is provided with a threaded layer, the cylinder is provided with an annular opening, and the inner walls on both sides of the annular opening are fixedly connected with a plurality of connecting blocks, a closing assembly is provided in the cylinder, the closing assembly comprises a closing valve arranged in the cylinder, the upper end of the closing valve is fixedly connected with a fixing block, the side of the fixing block away from the closing valve is rotatably connected with a rotating shaft, the side of the rotating shaft away from the fixing block is fixedly connected with a water wheel, a first gear is provided on the rotating shaft, a rotating rod is rotatably connected through the fixing block, a second gear is provided on the rotating rod, a cross bar is provided on the side of the rotating rod close to the closing valve, a mounting block is fixedly connected with the inner top of the cylinder, a threaded rod is rotatably connected through the mounting block, the threaded rod is connected to the cross bar through a connecting assembly, a threaded sleeve is threadedly connected to the threaded rod, a sealing ball is fixedly connected to the end of the threaded sleeve away from the threaded rod, and a water outlet is provided on the side wall of the closing valve.

[0007] Preferably, the inner top and the inner bottom of the closing valve are both provided with guide grooves, guide rods are slidably connected in the two guide grooves, and adjacent sides of the two guide rods are fixedly connected to the threaded sleeve.

[0008] Preferably, the connecting assembly includes a connecting groove arranged on the side of the cross rod close to the closing valve, an electromagnet is provided on the inner wall of the connecting groove close to the rotating rod, a clamping block is slidably connected in the connecting groove, the clamping block and the adjacent side of the electromagnet are elastically connected by a second spring, a clamping groove matching the clamping block is provided on one side of the threaded rod, and a pressure sensor is provided on the inner wall of the threaded sleeve close to the sealing ball.

[0009] Preferably, it also includes a limit assembly, which includes limit grooves arranged at the top and bottom of the closed valve, and sliding connection limit blocks are provided in both limit grooves, and the two limit blocks are elastically connected to the inner walls of the corresponding limit grooves through a first spring.

[0010] Preferably, the upper and lower ends of the cross bar are fixedly connected to vertical bars, the opposite sides of the two vertical bars are provided with movable grooves, the inner walls of the two movable grooves are sealed and slidably connected with rectangular blocks, the inner top and inner bottom of the closing valve are provided with rectangular grooves, and the two movable grooves are connected to the connecting groove through a three-way pipe.

[0011] Preferably, a sliding groove is provided on one side of the rotating rod close to the cross bar, the cross bar is slidably connected to the inner wall of the sliding groove, and the cross bar is elastically connected to the inner wall of the sliding groove via a third spring.

[0012] Preferably, a groove is provided on the sealing ball.

[0013] Preferably, a rectangular box is installed on the side of the fixed block away from the closing valve, the inner bottom of the rectangular box is fixedly connected to a pneumatic rod, the telescopic end of the pneumatic rod is fixedly connected to a moving block, and the upper end of the moving block is fixedly connected to a rack that matches the second gear.

[0014] Preferably, a one-way bearing is provided between the first gear and the rotating shaft, and the clockwise rotation of the rotating shaft can drive the first gear to rotate, while the counterclockwise rotation of the rotating shaft will not drive the first gear to rotate.

[0015] Preferably, a plurality of positioning blocks are provided on the inner top and the inner bottom of the cylinder, and the plurality of positioning blocks are respectively located on both sides of the closing valve.

[0016] The present invention has the following beneficial effects:

[0017] 1. Compared with the prior art, by setting the sealing ball and the threaded sleeve, when the packer is released, the high-flow water flow is used to drive the water wheel to rotate, so that the sealing ball moves to the right to seal the closing valve, thereby sealing the valve body more quickly and conveniently, and intercepting the flow inside the fracturing pipeline more quickly;

[0018] 2. Compared with the prior art, by setting the connection assembly, the rectangular groove and the rectangular block, after the closing valve is sealed, the cross bar and the threaded rod are no longer connected, and the two vertical rods are connected to the closing valve, so that after the closing valve is pushed to align with the water outlet, the rotation of the closing valve can clean up impurities such as stones at multiple positions between the packer and the hole wall;

[0019] 3. Compared with the prior art, the setting of the limiting assembly and the groove can limit the sealing ball after the sealing ball enters the closing valve and the threaded rod is separated from the cross rod, thereby preventing the sealing ball from being flushed out of the closing valve due to high-pressure water flow;

[0020] 4. Compared with the prior art, by setting the pneumatic rod and the rack, after the unblocking device is placed inside the packer, the distance between the sealing ball and the closing valve can be controlled by controlling the contraction degree of the pneumatic rod, thereby controlling the amount of flowing liquid in the closing valve, and then controlling the fluid pressure in the packer.

[0021] To sum up, the present invention can move the sealing ball into the closing valve more quickly, so that the flow in the fracturing pipeline can be cut off more quickly, and after the flow is cut off, the connecting assembly is disconnected, and the closing valve will move to the left, so that the water outlet is aligned with the annular opening. At this time, the high-pressure water flow drives the water wheel to rotate, which will cause the closing valve to rotate, so that the high-pressure water flow can be sprayed out through multiple positions, thereby better cleaning impurities such as stones between the hole wall and the packer, and through the setting of the pneumatic rod and the rack, the fluid pressure passing through the packer can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a packer release device proposed by the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0024] Figure 3 It is a structural schematic diagram of a closing valve;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure from another perspective;

[0026] Figure 5 for Figure 3 A plan cross-sectional view of

[0027] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0028] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0029] In the figure: 1 cylinder, 2 connecting pipe, 3 connecting head, 4 annular mouth, 5 water wheel, 6 rotating shaft, 7 first gear, 8 rectangular box, 9 second gear, 10 rotating rod, 11 moving block, 12 pneumatic rod, 13 rack, 14 closing valve, 15 connecting block, 16 cross bar, 17 vertical rod, 18 sealing ball, 19 groove, 20 positioning block, 21 threaded sleeve, 22 limiting groove, 23 first spring, 24 limiting block, 25 guide groove, 26 guide rod, 27 threaded rod, 28 card slot, 29 card block, 30 second spring, 31 electromagnet, 32 three-way pipe, 33 rectangular slot, 34 moving slot, 35 rectangular block, 36 fixed block, 37 slide slot, 38 third spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Reference Figure 1-Figure 7A packer release device comprises a cylinder 1, one side of the cylinder 1 is threadedly connected with a connecting pipe 2, the connecting pipe 2 and the cylinder 1 are threadedly connected, so that after the release device is used, the connecting pipe 2 can be removed, and the device inside the release device can be reset, so that the release device can be repeatedly used, the connecting pipe 2 is connected to a connector 3 on the side away from the cylinder 1, and the outer wall of the connector 3 is provided with a thread layer, so as to facilitate the connection of the release device with the packer, and the cylinder 1 is provided with an annular opening 4, and the inner walls on both sides of the annular opening 4 are fixed together. A plurality of connection blocks 15 are connected, a closing assembly is arranged in the cylinder 1, and the closing assembly includes a closing valve 14 arranged in the cylinder 1, and a rubber ring is arranged between the closing valve 14 and the cylinder 1, so as to ensure the sealing between the closing valve 14 and the cylinder 1, and a plurality of positioning blocks 20 are arranged on the inner top and the inner bottom of the cylinder 1, and the plurality of positioning blocks 20 are respectively located on both sides of the closing valve 14, so as to control the moving range of the closing valve 14, so as to ensure that the water outlet is aligned with the annular opening 4 when the high-pressure water flow pushes the closing valve 14, so as to avoid the water outlet In the case of excessive moving distance, the upper end of the closing valve 14 is fixedly connected to a fixing block 36, and the side of the fixing block 36 away from the closing valve 14 is rotatably connected to a rotating shaft 6, and the side of the rotating shaft 6 away from the fixing block 36 is fixedly connected to a water wheel 5, and the water wheel 5 can be driven to rotate by the high-pressure water flow. A first gear 7 is provided on the rotating shaft 6, and a rotating rod 10 is rotatably connected through the fixing block 36, and a second gear 9 is provided on the rotating rod 10. The first gear 7 and the second gear 9 are always in a meshing state, and a cross bar 1 is provided on the side of the rotating rod 10 close to the closing valve 14. 6. A slide groove 37 is provided on one side of the rotating rod 10 close to the cross bar 16. The cross bar 16 is slidably connected to the inner wall of the slide groove 37. The cross bar 16 is elastically connected to the right inner wall of the slide groove 37 through a third spring 38. A mounting block is fixedly connected to the inner top of the cylinder 1. A threaded rod 27 is rotatably connected to the mounting block. The threaded rod 27 is connected to the cross bar 16 through a connecting assembly. A threaded sleeve 21 is threadedly connected to the threaded rod 27. A sealing ball 18 is fixedly connected to one end of the threaded sleeve 21 away from the threaded rod 27. A water outlet is provided on the side wall of the closing valve 14.

[0032] The inner top and the inner bottom of the closing valve 14 are both provided with guide grooves 25 , and guide rods 26 are slidably connected in the two guide grooves 25 . The adjacent sides of the two guide rods 26 are fixedly connected to the threaded sleeve 21 .

[0033] Among them, the connecting component includes a connecting groove arranged on the side of the cross bar 16 close to the closing valve 14, an electromagnet 31 is provided on the inner wall of the connecting groove close to the rotating rod 10, a clamping block 29 is slidably connected in the connecting groove, the adjacent side of the clamping block 29 and the electromagnet 31 are elastically connected through a second spring 30, a clamping groove 28 matching with the clamping block 29 is provided on one side of the threaded rod 27, and a pressure sensor and a controller are provided on the inner wall of the threaded sleeve 21 close to the sealing ball 18. When the threaded rod 27 contacts the pressure sensor, the pressure sensor will generate an electrical signal transmitted to the controller, and the controller will control the electromagnet 31 to be energized. After the electromagnet 31 is energized, it will generate an attractive effect on the clamping block 29. The clamping block 29 is made of iron material.

[0034] Among them, it also includes a limit component, which includes limit grooves 22 arranged at the top and bottom of the closing valve 14, and sliding connection limit blocks 24 are provided in the two limit grooves 22. The two limit blocks 24 are elastically connected to the inner walls of the corresponding limit grooves 22 through a first spring 23. A groove 19 is provided on the sealing ball 18. When the sealing ball 18 moves to the right, since the contact position between the sealing ball 18 and the limit block 24 is an arc surface, the sealing ball 18 will push the two limit blocks 24 to move oppositely. When half of the sealing ball 18 enters the closing valve 14, under the elastic action of the first spring 23, the limit block 24 moves back. When the limit block 24 enters the groove 19, it can limit the sealing ball 18, so that after the threaded rod 27 and the cross bar 16 are separated, the high-pressure water flow will not flush the sealing ball 18 out of the closing valve 14, thereby ensuring the sealing effect of the fracturing water pipe.

[0035] Among them, the upper and lower ends of the cross bar 16 are fixedly connected with the vertical rod 17, and the opposite sides of the two vertical rods 17 are provided with movable grooves 34. The inner walls of the two movable grooves 34 are sealed and slidably connected with rectangular blocks 35. The inner top and inner bottom of the closing valve 14 are provided with rectangular grooves 33. The two movable grooves 34 are connected to the connecting groove through a three-way pipe 32. After the electromagnet 31 is energized, the rightward movement of the block 29 will reduce the space in the connecting groove, thereby pressing the gas into the two movable grooves 34, so that the two rectangular blocks 35 move back to back and enter the rectangular groove 33.

[0036] Among them, a rectangular box 8 is installed on the side of the fixed block 36 away from the closing valve 14, and a pneumatic rod 12 is fixedly connected to the inner bottom of the rectangular box 8. The telescopic end of the pneumatic rod 12 is fixedly connected to the moving block 11, and the upper end of the moving block 11 is fixedly connected to the rack 13 matched with the second gear 9. A one-way bearing is provided between the first gear 7 and the rotating shaft 6. The clockwise rotation of the rotating shaft 6 can drive the first gear 7 to rotate, and the counterclockwise rotation of the rotating shaft 6 will not drive the first gear 7 to rotate. Therefore, after the unblocking device is connected to the packer, although the liquid transported in the pipeline will also drive the water wheel 5 to rotate counterclockwise, it will not drive the first gear 7 to rotate, so that the unblocking device will not operate.

[0037] The functional principle of the present invention can be explained through the following operation mode: when the connector 3 is connected to the packer and then sent to the designated hole position, when the packer needs to be unstuck, high-pressure water flow can be injected into the fracturing pipeline, so that the high-pressure water flow drives the water wheel 5 to rotate clockwise, and then the rotating shaft 6 drives the first gear 7 to rotate clockwise, thereby driving the rotating rod 10 to rotate counterclockwise through the second gear 9;

[0038] Since the clamping block 29 is located in the clamping groove 28 in the initial state, the threaded rod 27 is connected to the cross rod 16. At this time, the rotation of the rotating rod 10 drives the cross rod 16 to rotate, and then drives the threaded rod 27 to rotate through the cross rod 16, so that the threaded sleeve 21 and the guide rod 26 move rightward, and then drives the sealing ball 18 to move rightward;

[0039] Since the surface of the sealing ball 18 is an arc surface, when the sealing ball 18 moves to the right, the two limit blocks 24 will move upward, thereby compressing the two first springs 23. When half of the sealing ball 18 enters the closing valve 14, as the sealing ball 18 continues to move to the right, the two limit blocks 24 will move relative to each other under the elastic action of the first spring 23, thereby resetting the limit blocks 24. When the threaded sleeve 21 moves to the specified position, the two limit blocks 24 will enter the groove 19, thereby preventing the threaded rod 27 from being separated from the cross bar 16 and the sealing ball 18 being flushed out of the closing valve 14 by the high-pressure water flow.

[0040] When the threaded sleeve 21 moves to the specified position, the threaded rod 27 squeezes the pressure sensor, so that the pressure sensor generates an electrical signal and transmits it to the controller. The controller controls the electromagnet 31 to be energized, so that the electromagnet 31 generates an attractive force on the block 29, and then the block 29 moves rightward and disengages from the slot 28, so that the threaded rod 27 is separated from the cross bar 16.

[0041] At this time, as the high-pressure water flow continues to be injected, the closing valve 14 will move leftward, thereby causing the crossbar 16 to move leftward, and the third spring 38 will be in a stretched state. When the closing valve 14 moves leftward until the water outlet is aligned with the annular opening 4, the high-pressure water flow will be ejected through the water outlet, thereby cleaning impurities such as stones between the packer and the hole wall;

[0042] When the block 29 moves rightward and disengages from the slot 28, the space in the connecting slot is reduced and the air pressure is increased, so that the gas in the connecting slot enters into the two moving slots 34, and then the two rectangular blocks 35 move back to back into the rectangular slot 33, so that the two vertical rods 17 are fixed to the closing valve 14;

[0043] When the high-pressure water flow can be ejected through the water outlet, the flow of the high-pressure water flow will drive the water wheel 5 to rotate again, so that the rotating rod 10 rotates again, and then the rotating rod 10 drives the two vertical rods 17 to rotate, so that the closing valve 14 rotates, so that the high-pressure water flow ejected from the water outlet can clean up the impurities such as stones at each position between the packer and the hole wall, so as to reduce the friction between the packer and the hole wall when the packer is unstuck;

[0044] After the unblocking device is installed in the packer, when the pressure of the fluid in the packer needs to be adjusted, the pneumatic rod 12 can be controlled to stretch or contract, so that the threaded sleeve 21 drives the sealing ball 18 to move left or right, thereby adjusting the size of the gap between the sealing ball 18 and the closing valve 14, thereby adjusting the flow rate of the liquid in the packer, and then adjusting the pressure of the liquid in the packer, thereby avoiding the occurrence of pipeline fracturing due to excessive pressure.

[0045] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A packer release device, comprising a cylinder (1), characterized in that: A connecting pipe (2) is threadedly connected to one side of the cylinder (1); a connecting head (3) is connected to the connecting pipe (2) at a side away from the cylinder (1); a threaded layer is provided on the outer wall of the connecting head (3); an annular opening (4) is provided on the cylinder (1); a plurality of connecting blocks (15) are fixedly connected to the inner walls on both sides of the annular opening (4); a sealing component is provided inside the cylinder (1); the sealing component comprises a sealing valve (14) arranged inside the cylinder (1); a fixing block (36) is fixedly connected to the upper end of the sealing valve (14); a rotating shaft (6) is rotatably connected to the side of the fixing block (36) away from the sealing valve (14); a water pipe (15) is fixedly connected to the side of the fixing block (36) away from the fixing block (36); The rotating shaft (6) is provided with a first gear (7), the fixed block (36) is penetrated by a rotating rod (10) and is rotatably connected, the rotating rod (10) is provided with a second gear (9), a side of the rotating rod (10) close to the closing valve (14) is provided with a cross bar (16), the inner top of the cylinder (1) is fixedly connected with a mounting block, the mounting block is penetrated by a threaded rod (27) and is rotatably connected, the threaded rod (27) and the cross bar (16) are connected via a connecting assembly, a threaded sleeve (21) is threadedly connected to the threaded rod (27), a sealing ball (18) is fixedly connected to the end of the threaded sleeve (21) away from the threaded rod (27), and a water outlet is provided on the side wall of the closing valve (14); It also includes a limit assembly, the limit assembly including limit grooves (22) arranged at the top and bottom of the closing valve (14), the two limit grooves (22) are each provided with a slidably connected limit block (24), and the two limit blocks (24) are elastically connected to the inner wall of the corresponding limit groove (22) via a first spring (23); The upper and lower ends of the cross bar (16) are fixedly connected to vertical bars (17), the two vertical bars (17) are provided with movable grooves (34) on opposite sides thereof, the inner walls of the two movable grooves (34) are sealed and slidably connected with rectangular blocks (35), the inner top and inner bottom of the closing valve (14) are provided with rectangular grooves (33), and the two movable grooves (34) are connected to the connecting groove via a three-way pipe (32); A slide groove (37) is provided on one side of the rotating rod (10) close to the cross rod (16), the cross rod (16) is slidably connected to the inner wall of the slide groove (37), and the cross rod (16) and the inner wall of the slide groove (37) are elastically connected via a third spring (38); The sealing ball (18) is provided with a groove (19); A rectangular box (8) is installed on a side of the fixed block (36) away from the closing valve (14); a pneumatic rod (12) is fixedly connected to the inner bottom of the rectangular box (8); a moving block (11) is fixedly connected to the telescopic end of the pneumatic rod (12); and a rack (13) matched with the second gear (9) is fixedly connected to the upper end of the moving block (11); A one-way bearing is provided between the first gear (7) and the rotating shaft (6); clockwise rotation of the rotating shaft (6) can drive the first gear (7) to rotate, while counterclockwise rotation of the rotating shaft (6) will not drive the first gear (7) to rotate.

2. A packer release device according to claim 1, characterized in that: The inner top and the inner bottom of the closing valve (14) are both provided with guide grooves (25), and guide rods (26) are slidably connected in the two guide grooves (25), and the adjacent sides of the two guide rods (26) are fixedly connected to the threaded sleeve (21).

3. A packer release device according to claim 1, characterized in that: The connection assembly comprises a connection groove arranged on a side of the cross bar (16) close to the closing valve (14); an electromagnet (31) is provided on the inner wall of the connection groove close to the rotating rod (10); a clamping block (29) is slidably connected in the connection groove; the clamping block (29) and the adjacent side of the electromagnet (31) are elastically connected via a second spring (30); a clamping groove (28) matching with the clamping block (29) is provided on one side of the threaded rod (27); and a pressure sensor is provided on the inner wall of the threaded sleeve (21) close to the sealing ball (18).

4. A packer release device according to claim 1, characterized in that: The inner top and the inner bottom of the cylinder (1) are both provided with a plurality of positioning blocks (20), and the plurality of positioning blocks (20) are respectively located on both sides of the closing valve (14).

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