Fracturing sliding sleeve ball seat blanking plug

Abstract

The utility model discloses a fracturing sliding sleeve ball seat blanking plug which comprises an upper connector, a pressure guiding piece, an actuating piece and a clamping jaw, a communicating hole is formed in the upper connector, the pressure guiding piece is arranged in the upper connector and used for guiding hydraulic force downwards, the top of the actuating piece is in threaded connection with the bottom of the upper connector, and the top of the actuating piece is in threaded connection with the bottom of the upper connector. The actuating piece is used for being matched with hydraulic pressure to transmit acting force downwards, and the clamping jaw is arranged on the outer side of the bottom of the actuating piece and used for clamping the inner wall of the sliding sleeve. According to the device, the upper connector, the pressure guiding piece, the actuating piece and the clamping jaw are arranged, so that the blanking plug capable of aiming at the specific stratum is constructed, and the purpose of timely plugging the specific stratum is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sliding sleeve plugs, in particular to a fracturing sliding sleeve ball seat plug. Background Art

[0002] Hydraulic fracturing is an important technology for increasing oil and gas production and water well injection. Its principle is to inject a large amount of viscous fluid into the well through a surface high-pressure pump group. Because the flow rate exceeds the absorption capacity of the formation, a very high pressure is generated near the injection port downhole. When the pressure exceeds the nearby formation stress and the tensile strength of the rock and soil, cracks are formed in the formation. The liquid in the cracks has a high seepage capacity, which can greatly improve the permeability of the oil and gas layer, achieving the effect of increasing production and injection.

[0003] However, in actual operation, due to the presence of water layers in the formation, the cracks generated during the fracturing process are connected to the water layers. At this time, when the pressure difference is large, the sliding sleeve connecting the two oil pipes is very likely to have water leakage problems. A large amount of formation water passes through the sliding sleeve and enters the oil pipe, occupying the internal space of the oil pipe, thereby reducing the flow space of crude oil, resulting in a decrease in the recovery rate. Therefore, a plug is needed to block the water outlet;

[0004] Since ordinary plugs are difficult to solve the problem of water leakage from the sliding sleeve in specific formations, there is an urgent need for a plug that can be used in production operations and can achieve the purpose of plugging in time after the problem of water leakage from the sliding sleeve occurs. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and propose a fracturing sleeve ball seat plugger to solve the technical problem in the prior art that it is difficult to block water outflow from a sleeve in a specific formation.

[0006] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a fracturing sleeve ball seat plugger, comprising an upper joint, a pressure guide, an actuator and a claw. A connecting hole is opened in the upper joint. The pressure guide is arranged in the upper joint and is used to introduce liquid pressure downward. The top of the actuator is threadedly connected to the bottom of the upper joint. The actuator is used to cooperate with the liquid pressure to transmit the force downward. The claw is arranged on the outside of the bottom of the actuator, and the claw is used to clamp the inner wall of the sleeve.

[0008] In some embodiments, the connecting hole is used to connect the upper joint with the oil pipe, the connecting hole is L-shaped, and the pressure guiding member is adapted to the connecting hole.

[0009] In some embodiments, the pressure-guiding member includes a ball-throwing eccentric pressure-transmitting hole, the ball-throwing eccentric pressure-transmitting hole is adapted to the connecting hole, the eccentric pressure-transmitting hole is opened on one side of the bottom of the connecting hole, and the bottom of the eccentric pressure-transmitting hole is adapted to the actuating member.

[0010] In some embodiments, the actuator includes an upper piston end, a lower piston end and a support end, the upper piston end includes an upper piston sleeve, an upper piston, a piston push rod and an intermediate joint, the top of the upper piston sleeve is threadedly connected to the bottom of the upper joint, the upper piston is slidably arranged in the upper piston sleeve, the top of the upper piston corresponds to the bottom of the eccentric pressure transmission hole, the top of the piston push rod is threadedly connected to the bottom of the upper piston, the intermediate joint is slidably sleeved on the outside of the piston push rod, and the support end is adapted to the claw.

[0011] In some embodiments, the lower piston end includes a lower piston sleeve and a lower piston, and the two end sides of the intermediate joint are respectively threadedly connected to the bottom of the upper piston sleeve and the top of the lower piston sleeve, and the lower piston is slidably arranged inside the lower piston sleeve, the top of the lower piston is in contact with the bottom of the piston push rod, and the top of the support end is connected to the bottom of the lower piston sleeve.

[0012] In some embodiments, the support end includes an outer sleeve, a first pin, a plug, a support sleeve and a second pin. The top inner wall of the outer sleeve is slidably sleeved on the bottom outer side of the lower piston sleeve. The outer sleeve is fixed to the lower piston sleeve by the first pin. The bottom of the plug is threadedly connected to the top of the support sleeve, and the plug and the support sleeve are both slidably arranged in the outer sleeve. The plug is fixed to the outer sleeve by the second pin. The outer wall of the support sleeve is provided with an annular bulge, and the bottom inner wall of the outer sleeve is provided with a first annular groove. The annular bulge is adapted to the first annular groove, and the bottom of the outer sleeve is rotatably connected to the top of the claw.

[0013] In some embodiments, a second annular groove is provided on the outer side of the bottom end of the plug, and a snap ring is provided in the second annular groove. The snap ring is C-shaped and is used to be embedded in the first annular groove.

[0014] In some embodiments, there are a plurality of the claws, and the plurality of the claws are used to be arranged in a ring around the bottom of the outer sleeve. The support sleeve is located inside the plurality of the claws, and the inner side of the claws corresponds to the annular bulge.

[0015] In some embodiments, a chamfer is formed between the outer sleeve and the plug, and the two chamfers are matched.

[0016] In some embodiments, an outer side of the outer sleeve is formed with an outer oblique shoulder, and an outer side of the bottom of the claw is formed with a protrusion upward, and the outer oblique shoulder and the protrusion are used to engage with the inner wall of the sliding sleeve.

[0017] Compared with the existing technology, the utility model provides a fracturing sleeve ball seat plugger, which constructs a plugger that can be targeted at a specific formation by setting an upper joint, a pressure guide, an actuator and a claw, thereby achieving the purpose of timely sealing the specific formation; during specific operation, the device is lowered into the well along with the oil pipe. After reaching the designed position, the connecting hole of the upper joint is sealed by the pressure guide. At this time, the liquid pressure continues to be transmitted downward to the actuator through the pressure guide, and the actuator moves downward and pushes the claw to clamp the inner wall of the sleeve, thereby achieving the sealing of the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a plug body of a fracturing sliding sleeve ball seat plug provided by an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure of the first stage of plugging the sliding sleeve;

[0020] Figure 3 yes Figure 1 Schematic diagram of the second stage of plugging the sliding sleeve;

[0021] Figure 4 It is a structural schematic diagram of the release operation of a fracturing sliding sleeve ball seat plugger provided by an embodiment of the utility model.

[0022] Explanation of the reference numerals: 100, upper joint; 110, connecting hole; 200, pressure-guiding member; 210, pitching ball; 220, eccentric pressure-transmitting hole; 300, actuator; 310, upper piston end; 311, upper piston sleeve; 312, upper piston; 313, piston push rod; 314, intermediate joint; 320, lower piston end; 321, lower piston sleeve; 322, lower piston; 330, supporting end; 331, outer sleeve; 332, first pin; 333, plug; 334, supporting sleeve; 335, second pin; 336, annular protrusion; 337, first annular groove; 338, second annular groove; 339, retaining ring; 400, claw; 500, chamfer; 600, outer oblique shoulder; 700, protrusion; 800, sliding sleeve; 810, inner oblique shoulder. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In order to solve the technical problem that it is difficult to block water outflow from a sliding sleeve of a specific formation, the utility model provides a fracturing sliding sleeve ball seat plugger, which can achieve the purpose of timely blocking a specific formation.

[0025] It should be noted that the fracturing sleeve ball seat plug described in the present invention is used for but not limited to sleeve plugs, etc. For the convenience of explanation, in the present invention, only a fracturing sleeve ball seat plug is used in a sleeve plug as an example for explanation. The principle of a fracturing sleeve ball seat plug being used in other types of equipment is essentially the same as the principle applied to the sleeve plug, and will not be repeated here.

[0026] See also Figure 1 - Figure 4 ,in, Figure 1 This is a structural diagram of a fracturing sleeve ball seat plugger in one embodiment of the present invention. A fracturing sleeve ball seat plugger includes an upper joint 100, a pressure guide 200, an actuator 300 and a claw 400. A connecting hole 110 is opened in the upper joint 100. The pressure guide 200 is arranged in the upper joint 100 and is used to introduce hydraulic pressure downward. The top of the actuator 300 is threadedly connected to the bottom of the upper joint 100. The actuator 300 is used to cooperate with the hydraulic pressure to transmit the force downward. The claw 400 is arranged on the outside of the bottom of the actuator 300 and is used to clamp the sleeve 800 (see Figure 2 the inner wall of the middle sliding sleeve 800 (the same below, not described in detail);

[0027] In this embodiment, the device is lowered into the well along with the oil pipe. After reaching the designed position, the connecting hole 110 of the upper joint 100 is sealed by the pressure-guiding member 200. At this time, the liquid pressure continues to be transmitted downward to the actuator 300 through the pressure-guiding member 200, and the actuator 300 moves downward and pushes the claw 400 to clamp the inner wall of the sleeve 800, thereby achieving the sealing of the sleeve 800.

[0028] In one embodiment, see Figure 1 The pressure-guiding member 200 includes a ball 210 and an eccentric pressure-transmitting hole 220. The ball 210 is adapted to the communicating hole 110. The eccentric pressure-transmitting hole 220 is opened on one side of the bottom of the communicating hole 110. The bottom of the eccentric pressure-transmitting hole 220 is adapted to the actuating member 300.

[0029] In this embodiment, after the ball 210 enters the communicating hole 110 , the outlet of the communicating hole 110 is blocked, so that the hydraulic pressure can only enter the eccentric pressure transmission hole 220 .

[0030] In one embodiment, see Figure 1 - Figure 3The actuator 300 includes an upper piston end 310, a lower piston end 320 and a support end 330. The upper piston end 310 includes an upper piston sleeve 311, an upper piston 312, a piston push rod 313 and an intermediate joint 314. The top of the upper piston sleeve 311 is threadedly connected to the bottom of the upper joint 100. The upper piston 312 is slidably arranged in the upper piston sleeve 311. The top of the upper piston 312 corresponds to the bottom of the eccentric pressure transmission hole 220. The top of the piston push rod 313 is threadedly connected to the bottom of the upper piston 312. The intermediate joint 314 is slidably sleeved on the outside of the piston push rod 313. The support end 330 is adapted to the claw 400.

[0031] The lower piston end 320 includes a lower piston sleeve 321 and a lower piston 322. The two ends of the intermediate joint 314 are respectively threadedly connected to the bottom of the upper piston sleeve 311 and the top of the lower piston sleeve 321. The lower piston 322 is slidably disposed inside the lower piston sleeve 321. The top of the lower piston 322 contacts the bottom of the piston push rod 313. The top of the support end 330 is connected to the bottom of the lower piston sleeve 321.

[0032] The support end 330 includes a sleeve 331, a first pin 332, a plug 333, a support sleeve 334 and a second pin 335. The top inner wall of the sleeve 331 is slidably sleeved on the bottom outer side of the lower piston sleeve 321. The sleeve 331 is fixed to the lower piston sleeve 321 by the first pin 332. The bottom of the plug 333 is threadedly connected to the top of the support sleeve 334, and the plug 333 and the support sleeve 334 are both slidably arranged in the sleeve 331. The plug 333 is fixed to the sleeve 331 by the second pin 335. The outer wall of the support sleeve 334 is provided with a ring protrusion 336. The bottom inner wall of the sleeve 331 is provided with a first ring groove 337. The ring protrusion 336 is adapted to the first ring groove 337. The bottom of the sleeve 331 is rotatably connected to the top of the claw 400.

[0033] Among them, a second annular groove 338 is formed on the outer side of the bottom end of the plug 333, and a snap ring 339 is provided in the second annular groove 338. The snap ring 339 is C-shaped and is used to engage with the first annular groove 337. A plurality of claws 400 are provided, and the plurality of claws 400 are used to be arranged around the bottom of the outer sleeve 331. The support sleeve 334 is located inside the plurality of claws 400, and the inner side of the claws 400 corresponds to the annular protrusion 336. A chamfer 500 is formed between the outer sleeve 331 and the plug 333, and the two chamfers 500 are adapted to each other. An outer side of the outer sleeve 331 is formed with an outer oblique shoulder 600, and a protrusion 700 is formed upward on the outer side of the bottom of the claw 400. The outer oblique shoulder 600 and the protrusion 700 are used to engage with the inner wall of the sliding sleeve 800.

[0034] In this embodiment, when hydraulic pressure enters the eccentric pressure transmission hole 220 and pushes the upper piston 312 downward, the upper piston 312 is threadedly connected to the piston push rod 313. When the upper piston 312 moves downward, it drives the piston push rod 313 to move together. The piston push rod 313 pushes the lower piston 322 and the plug 333 downward in turn. At this time, as the hydraulic pressure increases, the second pin 335 is sheared off, and the plug 333 can push the support sleeve 334 downward. The support sleeve 334 is threadedly connected to the plug 333, and the two have the same displacement distance.

[0035] Furthermore, the outer oblique shoulder 600 of the outer sleeve 331 and the inner oblique shoulder 810 of the sliding sleeve 800 (see Figure 3 The outer sleeve 331 stops moving downwards, and the claw 400 is released. The outer protrusion 700 cooperates with the outer oblique shoulder 600 on the outer sleeve 331 to clamp the sliding sleeve 800. As the support sleeve 334 continues to move downwards, the annular protrusion 336 on the support sleeve 334 presses against the inner side of the claw 400, limiting its rotation. At this time, the outer sleeve 331 is completely fixed.

[0036] Furthermore, as the support sleeve 334 and the plug 333 move downward, the retaining ring 339 will pass through the bottom of the outer sleeve 331 and be embedded in the first ring groove 337 of the outer sleeve 331. The retaining ring 339 clamps the outer sleeve 331 at the top and the support sleeve 334 at the bottom. At this time, the claw 400, the outer sleeve 331 and the support sleeve 334 are completely fixed in the sliding sleeve 800 to complete the sealing.

[0037] In one embodiment, see Figure 4 When the device needs to release the hand, the upper joint 100 is pulled upward, and the upper joint 100 drives the upper piston sleeve 311, the upper piston 312, the piston push rod 313, the intermediate joint 314, the lower piston sleeve 321 and the lower piston 322 upward. As the upward pulling force increases, the first pin 332 between the outer sleeve 331 and the lower piston sleeve 321 will be sheared off, and the upper joint 100, the upper piston sleeve 311, the upper piston 312, the piston push rod 313, the intermediate joint 314, the lower piston sleeve 321 and the lower piston 322 will be separated from the fixed parts such as the claw 400, and the hand is released.

[0038] In order to better understand the present invention, the following Figures 1 to 4The technical solution of the present invention is described in detail: when hydraulic pressure enters the eccentric pressure transmission hole 220 and pushes the upper piston 312 downward, the upper piston 312 is threadedly connected to the piston push rod 313. When the upper piston 312 moves downward, it drives the piston push rod 313 to move together. The piston push rod 313 pushes the lower piston 322 and the plug 333 downward in turn. At this time, as the hydraulic pressure increases, the second pin 335 is sheared off, and the plug 333 can push the support sleeve 334 downward. The support sleeve 334 is threadedly connected to the plug 333, and the displacement distance of the two is consistent;

[0039] Furthermore, as the lower piston 322 continues to move downward, the outer oblique shoulder 600 on the outer surface of the outer sleeve 331 contacts the inner oblique shoulder 810 on the sliding sleeve 800, causing the outer sleeve 331 to stop moving downward. At this time, the claw 400 is released, and the protrusion 700 on the outer surface of the claw 400 cooperates with the outer oblique shoulder 600 on the outer surface of the outer sleeve 331 to clamp the sliding sleeve 800. As the support sleeve 334 continues to move downward, the annular protrusion 336 on the support sleeve 334 presses against the inner side of the claw 400, limiting the rotation of the claw 400. At this time, the outer sleeve 331 is completely fixed.

[0040] Furthermore, as the support sleeve 334 and the plug 333 move downward, the retaining ring 339 will pass through the bottom of the outer sleeve 331 and be embedded in the first ring groove 337 of the outer sleeve 331. The retaining ring 339 clamps the outer sleeve 331 at the top and the support sleeve 334 at the bottom. At this time, the claw 400, the outer sleeve 331 and the support sleeve 334 are completely fixed in the sliding sleeve 800 to complete the sealing.

[0041] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A fracturing sliding sleeve ball seat plug, characterized in that: include: An upper joint, wherein a communication hole is formed in the upper joint; a pressure guide member, the pressure guide member being arranged in the upper joint and used for introducing the hydraulic pressure downward; an actuating member, the top of which is threadedly connected to the bottom of the upper joint, and the actuating member is used to cooperate with the hydraulic pressure to transmit the force downward; as well as The clamping claw is arranged on the outer side of the bottom of the actuating member and is used to clamp the inner wall of the sliding sleeve.

2. The fracturing sliding sleeve ball seat plug according to claim 1, characterized in that: The communicating hole is used to connect the upper joint with the oil pipe. The communicating hole is L-shaped, and the pressure guiding member is adapted to the communicating hole.

3. The fracturing sliding sleeve ball seat plug according to claim 1, characterized in that: The pressure-guiding component includes a pitching ball and an eccentric pressure-transmitting hole. The pitching ball is matched with the connecting hole. The eccentric pressure-transmitting hole is opened on one side of the bottom of the connecting hole. The bottom of the eccentric pressure-transmitting hole is matched with the actuating component.

4. The fracturing sliding sleeve ball seat plug according to claim 3, characterized in that: The actuating member includes an upper piston end, a lower piston end and a supporting end. The upper piston end includes an upper piston sleeve, an upper piston, a piston push rod and an intermediate joint. The top of the upper piston sleeve is threadedly connected to the bottom of the upper joint. The upper piston is slidably arranged in the upper piston sleeve. The top of the upper piston corresponds to the bottom of the eccentric pressure transmission hole. The top of the piston push rod is threadedly connected to the bottom of the upper piston. The intermediate joint is slidably sleeved on the outside of the piston push rod, and the supporting end is adapted to the claw.

5. The fracturing sliding sleeve ball seat plug according to claim 4, characterized in that: The lower piston end includes a lower piston sleeve and a lower piston. The two end sides of the intermediate joint are respectively threadedly connected to the bottom of the upper piston sleeve and the top of the lower piston sleeve. The lower piston is slidably arranged inside the lower piston sleeve. The top of the lower piston contacts the bottom of the piston push rod, and the top of the support end is connected to the bottom of the lower piston sleeve.

6. The fracturing sliding sleeve ball seat plug according to claim 5, characterized in that: The supporting end includes an outer sleeve, a first pin, a plug, a support sleeve and a second pin. The top inner wall of the outer sleeve is slidably sleeved on the bottom outer side of the lower piston sleeve. The outer sleeve is fixed to the lower piston sleeve by the first pin. The bottom of the plug is threadedly connected to the top of the support sleeve, and the plug and the support sleeve are both slidably arranged in the outer sleeve. The plug is fixed to the outer sleeve by the second pin. The outer wall of the support sleeve is provided with an annular bulge, and the bottom inner wall of the outer sleeve is provided with a first annular groove. The annular bulge is adapted to the first annular groove, and the bottom of the outer sleeve is rotatably connected to the top of the claw.

7. The fracturing sliding sleeve ball seat plug according to claim 6, characterized in that: A second annular groove is provided on the outer side of the bottom end of the plug, and a snap ring is provided in the second annular groove. The snap ring is C-shaped and is used to be embedded in the first annular groove.

8. The fracturing sliding sleeve ball seat plug according to claim 6, characterized in that: There are a plurality of the claws, which are used to be arranged in a ring around the bottom of the outer sleeve. The support sleeve is located inside the plurality of the claws, and the inner sides of the claws correspond to the annular bulge.

9. The fracturing sliding sleeve ball seat plug according to claim 6, characterized in that: A chamfer is formed between the outer sleeve and the plug, and the two chamfers are matched with each other.

10. The fracturing sliding sleeve ball seat plug according to claim 8, characterized in that: An outer side of the outer sleeve is formed with an outer oblique shoulder, and an outer side of the bottom of the claw is upwardly formed with a protrusion, and the outer oblique shoulder and the protrusion are used to engage with the inner wall of the sliding sleeve.

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