Prefabricated soluble blanking plug

Abstract

The utility model relates to the technical field of oil and gas well fracturing, and discloses a prefabricated soluble blanking plug which comprises a round cylinder, the inner wall of the round cylinder is fixedly connected with a limiting plate, the front face of the limiting plate and the back face of the round cylinder are both provided with grooves, a baffle is arranged in the round cylinder, the outer surface of the baffle is fixedly connected with a fixing block, and the fixing block is fixedly connected with the limiting plate. Rectangular plates are fixedly connected to the two side faces of the fixing block, a bearing is fixedly connected to the inner wall of each rectangular plate, and a rotating shaft is jointly and fixedly connected to inner rings of the two bearings; the tool string can be pulled out, after the tool string is pulled out, the baffle and the fixing block can cover the groove, the roller and the rotating shaft rotate in the bearing, it can be guaranteed that when the tool string moves, the roller and the rotating shaft cannot be abraded too much, and it is avoided that when the device is used, the tool string needs to complete releasing work and is pulled out of the ground, and the tool string cannot be damaged. And the ball is thrown again to block the space through which the tool string passes when the tool string works, so that certain inconvenience exists.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well fracturing technology, specifically a prefabricated soluble plugging device. Background Technology

[0002] Oil and gas well fracturing refers to a method of creating fractures in oil and gas reservoirs using hydraulic force during oil or gas production. Also known as hydraulic fracturing, fracturing artificially creates fractures in the formation to improve the underground flow environment of oil and increase oil well production. It plays an important role in improving bottomhole flow conditions, mitigating interlayer flow, and improving reservoir dynamics. Currently, soluble plugs are generally used in oil and gas well fracturing operations.

[0003] Currently, existing soluble plugging devices require the tool string to be released during operation. After release, a plugging ball needs to be inserted from the surface into the oil and gas well so that it blocks the space in the plugging device that was originally used to pass through the tool string, thus forming a closed loop. When the plugging ball enters the plugging device, the operator needs to precisely insert the plugging ball inside the plugging device. Therefore, the process is relatively cumbersome and inconvenient to operate. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a prefabricated soluble plug, which has the advantage that the closed-loop operation will automatically begin as the tool string is released.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated soluble plugging device, comprising a cylindrical cylinder, a limiting plate fixedly connected to the inner wall of the cylindrical cylinder, grooves provided on the front side of the limiting plate and the back side of the cylindrical cylinder, a baffle plate provided inside the cylindrical cylinder, a fixing block fixedly connected to the outer surface of the baffle plate, rectangular plates fixedly connected to both sides of the fixing block, a bearing fixedly connected to the inner wall of each rectangular plate, a rotating shaft fixedly connected to the inner rings of two bearings, a roller fixedly connected to the outer surface of the rotating shaft, the front side of the baffle plate, the back side of the baffle plate, the front side of the fixing block, and the back side of the fixing block all contact the back side of the limiting plate and the inner wall of the cylindrical cylinder, a support block fixedly connected to the inner wall of the cylindrical cylinder, the front side of the support block and the back side of the support block being fixedly connected to the back side of the limiting plate and the inner wall of the cylindrical cylinder, respectively.

[0008] Preferably, a frustum cylinder is fixedly connected to the front of the cylindrical tube, and a rubber hose is slidably connected to the outer surface of the frustum cylinder.

[0009] Preferably, a probe is fixedly connected to the front of the rubber hose, and a circular opening is provided on the front of the probe.

[0010] Preferably, the inner wall of the probe is fixedly connected to two ropes, the two grooves are slidably connected to a tool string, and the outer surface of the tool string is fixedly connected to two square blocks.

[0011] Preferably, a blade is fixedly connected to the back of each of the square blocks, and the outer surface of each blade is in contact with the outer surface of the rope.

[0012] Preferably, a circular ring is fixedly connected to the outer surface of the tool string, and the front of the circular ring is in contact with the back of the circular cylinder.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a prefabricated soluble plugging device, which has the following characteristics:

[0015] Beneficial effects:

[0016] This prefabricated soluble blocker, through the interaction of a limiting plate, a groove, and a cylindrical cylinder, ensures the smooth passage of the tool string and the equipment fixed to its outer surface. The interaction of a baffle, fixing block, rectangular plate, bearing, rotating shaft, roller, and support block allows the tool string to be pulled outwards during operation. After the tool string is fully extended, the baffle and fixing block cover the groove. The roller and rotating shaft, rotating within the bearing, prevent excessive wear on the tool string during movement. This avoids the inconvenience of having to re-insert the ball to block the space the tool string previously traversed after it has been removed from the ground. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the prefabricated soluble plugger of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the tool string of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the baffle of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the probe of this utility model.

[0021] In the diagram: 1. Circular cylinder; 2. Tool string; 3. Frustum cylinder; 4. Probe; 5. Rubber hose; 6. Baffle; 7. Limiting plate; 8. Groove; 9. Support block; 10. Rectangular plate; 11. Shaft; 12. Bearing; 13. Fixing block; 14. Roller; 15. Rope; 16. Blade; 17. Square block; 18. Circular opening; 19. Circular ring. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this utility model, a prefabricated soluble plugger of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Please see Figures 1-4 This utility model discloses a prefabricated soluble plug, comprising a cylindrical cylinder 1, a limiting plate 7 fixedly connected to the inner wall of the cylindrical cylinder 1, grooves 8 being provided on the front side of the limiting plate 7 and the back side of the cylindrical cylinder 1, a frustum cylinder 3 fixedly connected to the front side of the cylindrical cylinder 1, and a rubber hose 5 slidably connected to the outer surface of the frustum cylinder 3. By providing the frustum cylinder 3 and the rubber hose 5, the rubber hose 5 can slide on the outer surface of the frustum cylinder 3, thereby guiding the rubber hose 5 to contact the wall.

[0024] The inside of the cylindrical tube 1 is equipped with a baffle 6, and a fixing block 13 is fixedly connected to the outer surface of the baffle 6. The front of the rubber hose 5 is fixedly connected to a probe 4, and the front of the probe 4 has a circular opening 18. By setting the probe 4 and the circular opening 18, the probe 4 can guide the device to move into the interior of the oil and gas well, which has a good auxiliary effect.

[0025] Rectangular plates 10 are fixedly connected to both sides of the fixed block 13. Bearings 12 are fixedly connected to the inner wall of each rectangular plate 10. Two ropes 15 are fixedly connected to the inner wall of the probe 4. Tool string 2 is slidably connected to the inside of the two grooves 8. Two square blocks 17 are fixedly connected to the outer surface of the tool string 2. By setting up ropes 15 and tool string 2, the tool string 2 can be indirectly connected through ropes 15, thereby providing power for the movement of the rubber hose 5.

[0026] The inner rings of the two bearings 12 are fixedly connected to the rotating shaft 11. The outer surface of the rotating shaft 11 is fixedly connected to the roller 14. The front and back of the baffle 6, the front and back of the fixing block 13 are all in contact with the back of the limiting plate 7 and the inner wall of the cylindrical cylinder 1. The inner wall of the cylindrical cylinder 1 is fixedly connected to the support block 9. The back of each square block 17 is fixedly connected to the blade 16. The outer surface of each blade 16 is in contact with the outer surface of the rope 15. By setting the blade 16, the rope 15 can be cut by the blade 16 to achieve the purpose of letting go.

[0027] The front and back of the support block 9 are fixedly connected to the back of the limiting plate 7 and the inner wall of the cylindrical cylinder 1, respectively. A circular ring 19 is fixedly connected to the outer surface of the tool string 2. The front of the circular ring 19 is in contact with the back of the cylindrical cylinder 1. By providing the circular ring 19, the power generated by the tool string 2 can be transmitted to the cylindrical cylinder 1, thereby ensuring that the cylindrical cylinder 1 and the rubber hose 5 move synchronously.

[0028] The working principle of this utility model is as follows: First, the tool string 2 can be used to push the cylindrical cylinder 1 and the device connected to the front of the cylindrical cylinder 1 into the interior of the oil and gas well. When the device moves to the appropriate working position, the tool string 2 can be pulled to release the device. When the tool string 2 returns along the original path, the square block 17 fixed on the outer surface of the tool string 2 and the blade 16 fixed on the back of the square block 17 will first contact the rope 15. The rope 15 will be pulled by the blade 16. Due to the sliding of the rubber hose 5 on the outer surface of the frustum cylinder 3, the rope 15 will drive the probe 4 and the rubber hose 5 to slide towards the frustum cylinder 3 until the outer surface of the rubber hose 5 contacts the inner wall of the oil and gas well. At this time, the rubber hose 5 will be stuck between the oil and gas well and the inner wall of the well. Between the truncated cone 3, the pulling force of the blade 16 will be entirely applied to the rope 15, eventually cutting the rope 15 and completing the release operation. The rope 15 can be made of multiple water-soluble threads twisted together, ensuring that the rope can also dissolve smoothly after the blocker dissolves. After the tool string 2 is completely pulled out, the baffle 6 and the fixing block 13 will move downwards due to gravity, thus blocking the groove 8 and sealing the blocker. Furthermore, the roller 14 and the rotating shaft 11 rotate inside the bearing 12, which can effectively reduce the friction between the roller 14 and the tool string 2 when the tool string 2 moves, thereby avoiding the problem that the process is relatively complicated and inconvenient to operate when using the device.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A pre-packed dissolvable plug comprising a circular cylinder (1) characterised in that: The inner wall of the circular cylinder (1) is fixedly connected with a limiting plate (7), the front surface of the limiting plate (7) and the back surface of the circular cylinder (1) are both provided with a groove (8), the inside of the circular cylinder (1) is provided with a baffle (6), the outer surface of the baffle (6) is fixedly connected with a fixed block (13), the two side surfaces of the fixed block (13) are both fixedly connected with a rectangular plate (10), the inner wall of each rectangular plate (10) is fixedly connected with a bearing (12), the inner rings of the two bearings (12) are commonly fixedly connected with a rotating shaft (11), the outer surface of the rotating shaft (11) is fixedly connected with a roller (14), the front surface of the baffle (6), the back surface of the baffle (6), the front surface of the fixed block (13) and the back surface of the fixed block (13) are all in contact with the back surface of the limiting plate (7) and the inner wall of the circular cylinder (1), the inner wall of the circular cylinder (1) is fixedly connected with a supporting block (9), the front surface of the supporting block (9) and the back surface of the supporting block (9) are respectively fixedly connected with the back surface of the limiting plate (7) and the inner wall of the circular cylinder (1).

2. A pre-packed soluble plug according to claim 1, wherein: The front surface of the circular cylinder (1) is fixedly connected with a circular truncated cone cylinder (3), the outer surface of the circular truncated cone cylinder (3) is slidably connected with a rubber hose (5).

3. A pre-packed soluble plug according to claim 2, wherein: The front surface of the rubber hose (5) is fixedly connected with a probe (4), the front surface of the probe (4) is provided with a circular port (18).

4. A pre-packed soluble plug according to claim 3, wherein: The inner wall of the probe (4) is fixedly connected with two ropes (15), the inside of the two grooves (8) is commonly slidably connected with a tool string (2), the outer surface of the tool string (2) is fixedly connected with two square blocks (17).

5. A pre-packed soluble plug according to claim 4, wherein: The back surface of each square block (17) is fixedly connected with a blade (16), the outer surface of each blade (16) is in contact with the outer surface of the rope (15).

6. A pre-packed soluble plug according to claim 4, wherein: The outer surface of the tool string (2) is fixedly connected with a circular ring (19), the front surface of the circular ring (19) is in contact with the back surface of the circular cylinder (1).

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