Quick soluble bridge plug

Abstract

The fast soluble bridge plug comprises a bridge plug body and a dissolution promoting assembly, a containing groove is formed in the inner wall of the bridge plug body, the dissolution promoting assembly comprises a solution bag and a V-shaped rod, the solution bag is contained in the containing groove, the tip end of the V-shaped rod is hinged to the inner wall of the bridge plug body, and the opening end of the V-shaped rod is connected with the solution bag and connected with the solution bag through the V-shaped rod. An automatic opening structure of the solution bag is formed, the lengths of the two ends of the opening end of the V-shaped rod are the same, the V-shaped rod can be driven to rotate twice by selecting the same ball size of two times of ball throwing, packing and solution bag opening are completed in the front-back direction, and therefore a processing factory does not need two different molds for producing balls. And the use cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas exploitation, and particularly relates to a fast-soluble bridge plug. Background Art

[0002] In staged fracturing operations, a bridge plug device is required for staged construction. After the use of an insoluble bridge plug, it needs to be gradually drilled and milled to remove the blockage, which is likely to cause casing deformation and produce a large amount of relatively large residues that hinder circulation. Therefore, soluble bridge plugs have been developed to replace insoluble bridge plugs. For example, the utility model patent with the authorization announcement number CN220081384U and the name of a soluble bridge plug. When in use, the bridge plug is sent to the designated position. After pushing the push ring to expand the slips and the rubber cylinder, the bridge plug is fixed in the wellbore. After removing the support string, a ball with a diameter matching the ball seat is put into the bridge plug to achieve isolation. When an external force needs to be applied to the pulling seat to build pressure, a ball with a slightly larger diameter matching the pulling seat is put in. When the ball with a slightly larger diameter is seated on the pulling seat, pressure is applied to the space above the bridge plug, and the pulling seat is cut off from the inner surface of the bridge plug, so that the solution capsule is pulled towards the connection hole and then cut by the cutting block arranged on the connection hole, and the solution filled in the solution capsule is released to contact the inside of the bridge plug, thereby achieving all-round promotion of dissolution for the soluble bridge plug.

[0003] However, the above device requires two different sizes of balls, which requires the processing factory to use two different molds for production, thereby increasing the use cost. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above technical deficiencies, propose a fast-soluble bridge plug, and solve the technical problem that two different sizes of balls are required for isolation and opening the solution in the prior art, resulting in the need for two different molds for the processing factory to produce balls, thereby increasing the use cost.

[0005] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a fast-soluble bridge plug, including:

[0007] A bridge plug body, wherein an accommodation groove is formed on the inner wall of the bridge plug body;

[0008] A dissolution promoting assembly, the dissolution promoting assembly includes a solution capsule and a V-shaped rod. The solution capsule is accommodated in the accommodation groove. The tip of the V-shaped rod is hinged to the inner wall of the bridge plug body, and the open end of the V-shaped rod is connected to the solution capsule.

[0009] In some embodiments, a rotation channel is formed at the bottom end of the accommodation groove. The rotation channel is respectively communicated with the accommodation groove and the inside of the bridge plug body. The tip of the V-shaped rod is hinged to the inner wall of the rotation channel.

[0010] In some embodiments, a first shear pin is fixedly connected to the inner wall of the rotating channel, and the V-shaped rod is fixedly connected to the inner wall of the rotating channel through the first shear pin.

[0011] In some embodiments, a second shear pin is fixedly connected to the inner wall of the rotating channel. The second shear pin is located at the open end of the V-shaped rod and is used to prevent the rotation of the V-shaped rod.

[0012] In some embodiments, a solution chamber cover is detachably connected between the accommodation groove and the rotating channel.

[0013] In some embodiments, the solution chamber cover is provided with a connection hole. A connection cable is accommodated in the connection hole. Two ends of the connection cable are respectively fixedly connected to the solution bag and the V-shaped rod. A cutting piece is provided at the top end of the connection hole.

[0014] In some embodiments, chamfers are provided at the open ends of the V-shaped rods.

[0015] In some embodiments, a ball seat is provided inside the bridge plug body.

[0016] In some embodiments, a push ring, a rubber cylinder, an inclined block, a slip and a guide shoe are sequentially sleeved on the outer surface of the bridge plug body from top to bottom.

[0017] In some embodiments, a push ring pin is fixedly connected between the push ring and the outer surface of the bridge plug body.

[0018] Compared with the prior art, a rapid dissolvable bridge plug provided by the present utility model is connected with a solution bag through a V-shaped rod, forming an automatic opening structure of the solution bag. Further, since the lengths of both ends of the open end of the V-shaped rod are the same, the same size of ball can be selected for two ball throws to drive the V-shaped rod to rotate twice, and seal off and open the solution bag before and after, so that the processing factory does not need two different molds for producing balls, effectively reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a rapid dissolvable bridge plug provided by an embodiment of the present utility model (in the state of the first ball throw);

[0020] Figure 2 is Figure 1 a partial enlarged view of part A in

[0021] Figure 3 is a schematic structural diagram of a rapid dissolvable bridge plug provided by an embodiment of the present utility model (in the state of the second ball throw);

[0022] Figure 4 Yes Figure 3 It is a partial enlarged view of part B in Figure 4 .

[0023] Explanation of reference numerals in the drawings: 1. Packer body; 11. Accommodating groove; 12. Rotating channel; 121. First shear pin; 122. Second shear pin; 13. Ball seat; 2. Dissolution promoting assembly; 21. Solution capsule; 22. V-shaped rod; 23. Solution chamber cover; 231. Connecting hole; 232. Cutting piece; 24. Connecting cable; 3. Pushing ring; 31. Pushing ring pin; 4. Rubber cylinder; 5. Inclined block; 6. Slip; 7. Guide shoe. Specific embodiments

[0024] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] In order to solve the technical problem that two different sizes of balls are required for sealing and opening the solution, resulting in the need for two different molds in the processing factory for producing balls, thereby increasing the use cost, the present utility model provides a quick-soluble packer that can achieve sealing and opening the solution with one size of ball, reducing the use cost.

[0026] It should be noted that the quick-soluble packer described in the present utility model is used for but not limited to packers, etc. For the convenience of description, in the present utility model, only a quick-soluble packer applied to a packer is taken as an example for description, and the principle of applying a quick-soluble packer to other types of equipment is substantially the same as that applied to a packer, which will not be elaborated one by one here.

[0027] Please refer to Figure 1 - Figure 4 , wherein Figure 1 is a schematic structural diagram of a quick-soluble packer in an embodiment of the present utility model. A quick-soluble packer includes a packer body 1 and a dissolution promoting assembly 2. An accommodating groove 11 is formed in the inner wall of the packer body 1. The dissolution promoting assembly 2 includes a solution capsule 21 and a V-shaped rod 22. The solution capsule 21 is accommodated in the accommodating groove 11. The tip of the V-shaped rod 22 is hinged to the inner wall of the packer body 1, and the open end of the V-shaped rod 22 is connected to the solution capsule 21.

[0028] In this embodiment, by connecting the V-shaped rod 22 with the solution capsule 21, an automatic opening structure of the solution capsule 21 is formed. Further, since the lengths of both ends of the open end of the V-shaped rod 22 are the same, the selection of the same size of ball for two ball throws can drive the V-shaped rod 22 to rotate twice and complete sealing and opening the solution capsule 21 before and after, so that the processing factory does not need two different molds for producing balls, effectively reducing the use cost.

[0029] First, for the first ball throw, the ball stays at the lower end of the opening of the V-shaped rod 22; then, by applying pressure, the ball drives the V-shaped rod 22 to rotate once, and the higher end of the opening of the V-shaped rod 22 rotates to the original position of the lower end. At the same time, the ball continues to fall after passing through the V-shaped rod 22 along with the opening of the V-shaped rod 22 until it is sealed; subsequently, for the second ball throw, the ball stays at the higher end of the opening of the V-shaped rod 22; finally, by applying pressure, the ball drives the V-shaped rod 22 to rotate a second time, and the higher end of the opening of the V-shaped rod 22 rotates and opens the solution capsule 21.

[0030] Furthermore, the solution capsule 21 is filled with a solution, and the composition of the solution should be selected based on the material of the bridge plug, such as an inorganic salt solution, an acidic solution, etc. Therefore, the solution capsule 21 needs to be protected from being corroded in advance by the solution. Its material composition can use a biodegradable organic film, such as a modified polyvinyl alcohol material, which can be easily dissolved and can also be quickly broken under external force, so as to quickly release the built-in solution for dissolving the bridge plug from the inside.

[0031] In one embodiment, please refer to Figure 2 and Figure 4 , a rotating channel 12 is opened at the bottom end of the receiving groove 11. The rotating channel 12 is in communication with both the receiving groove 11 and the inside of the bridge plug body 1, and the tip of the V-shaped rod 22 is hinged to the inner wall of the rotating channel 12.

[0032] In this embodiment, the function of the rotating channel 12 is to facilitate the installation of the V-shaped rod 22, and the thickness of the rotating channel 12 is the same as that of the V-shaped rod 22, ensuring the stability of the V-shaped rod 22 during rotation.

[0033] In one embodiment, please refer to Figure 2 and Figure 4 , a first shear pin 121 is fixedly connected to the inner wall of the rotating channel 12, and the V-shaped rod 22 is fixedly connected to the inner wall of the rotating channel 12 through the first shear pin 121.

[0034] In one embodiment, please refer to Figure 2 and Figure 4 , a second shear pin 122 is fixedly connected to the inner wall of the rotating channel 12. The second shear pin 122 is located at the opening end of the V-shaped rod 22, and the second shear pin 122 is used to prevent the rotation of the V-shaped rod 22.

[0035] In this embodiment, the first shear pin 121 is connected to the lower end of the open end of the V-shaped rod 22. After a primary ball throw, the ball pushes the lower end of the open end of the V-shaped rod 22 under continuous pressing until the first shear pin 121 breaks under the pressure, causing the V-shaped rod 22 to rotate once until the higher end of the open end of the V-shaped rod 22 abuts against the second shear pin 122 and stops rotating. Then the ball continues to drop along with the open end of the V-shaped rod 22 to achieve isolation.

[0036] Subsequently, for a secondary ball throw, the ball pushes the higher end of the open end of the V-shaped rod 22 under continuous pressing until the second shear pin 122 breaks under the pressure, causing the V-shaped rod 22 to rotate twice. At the same time, during the second rotation of the V-shaped rod 22, the solution bladder 21 is opened and the solution flows out.

[0037] In one embodiment, please refer to Figure 2 and Figure 4 , a solution chamber cover 23 is detachably connected between the receiving groove 11 and the rotating channel 12.

[0038] In one embodiment, please refer to Figure 2 and Figure 4 , the solution chamber cover 23 is provided with a connection hole 231. A connection cable 24 is received in the connection hole 231. Both ends of the connection cable 24 are fixedly connected to the solution bladder 21 and the V-shaped rod 22 respectively. A cutting piece 232 is provided at the top of the connection hole 231.

[0039] In this embodiment, the solution chamber cover 23 is used to separate the internal spaces of the receiving groove 11 and the bridge plug body 1, and the solution chamber cover 23 is located between the V-shaped rod 22 and the solution bladder 21, which facilitates filling the solution bladder 21 into the receiving groove 11 and does not affect the cutting piece 232 from piercing the solution bladder 21.

[0040] Furthermore, in order to prevent the V-shaped rod 22 from opening the solution bladder 21 during the first rotation, the initial state of the connection cable 24 is in a loose coiled state in the connection hole 231. When the V-shaped rod 22 rotates once, the connection cable 24 is straightened under the drive of the V-shaped rod 22.

[0041] In one embodiment, please refer to Figure 2 and Figure 4 , chamfers are provided at the open ends of the V-shaped rod 22.

[0042] In this embodiment, the function of the chamfer is to improve the adaptability with the ball and facilitate the ball to drive the V-shaped rod 22 to rotate more smoothly after being pressed.

[0043] In one embodiment, please refer to Figure 1 and Figure 3 , a ball seat 13 is provided inside the bridge plug body 1.

[0044] In this embodiment, the ball seat 13 has a reduced diameter structure, which is used to improve its adaptability, avoid ball dislocation, and improve the stability of the setting process.

[0045] In one embodiment, see Figure 1 and Figure 3 The outer surface of the bridge plug body 1 is sequentially sleeved with a push ring 3, a rubber sleeve 4, a ramp 5, a slip 6 and a guide shoe 7 from top to bottom.

[0046] In this embodiment, after the bridge plug is delivered to the position to be sealed, an external pushing device is used to push the push ring 3, and the rubber cylinder 4 and the inclined block 5 are pushed downward from top to bottom in turn, until the inclined block 5 opens the cava 6, so that the bridge plug is fixed on the wellbore as a whole. At the same time, after the inclined block 5 is pushed to the point where it cannot move, the rubber cylinder 4 will also be opened under the action of the thrust, playing the role of sealing the wellbore. Furthermore, in order to maintain the supporting state of the cava 6, a corresponding non-return mechanism should be provided on the inclined block 5 to prevent the cava 6 from resetting, such as a barb with a non-return or non-return ring structure.

[0047] Furthermore, the rubber cylinder 4 is made of soluble rubber, and the V-shaped rod 22 and the solution chamber cover 23 are both made of soluble metal, thereby ensuring the dissolution effect of the bridge plug.

[0048] In one embodiment, see Figure 1 and Figure 3 A push ring pin 31 is fixedly connected between the push ring 3 and the outer surface of the bridge plug body 1 .

[0049] In this embodiment, the push ring 3 is fixed to the outer surface of the bridge plug body 1 via the push ring pin 31 to prevent the push ring 3 from moving randomly due to external force. When it is needed, the push ring 3 can be moved by cutting the push ring pin 31 with a strong external force.

[0050] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the utility model is described in detail:

[0051] First, for the first ball throwing, the ball stays at the lower end of the opening end of the V-shaped rod 22; then, under pressure, the first shear pin 121 breaks, the ball drives the V-shaped rod 22 to rotate once, and the higher end of the opening end of the V-shaped rod 22 rotates and abuts against the second shear pin 122 and then stops rotating. At the same time, the ball continues to fall onto the ball seat 13 as the opening end of the V-shaped rod 22 passes through the V-shaped rod 22, achieving isolation; subsequently, for the second ball throwing, the ball stays at the higher end of the opening end of the V-shaped rod 22; finally, under pressure, the second shear pin 122 breaks, the ball drives the V-shaped rod 22 to rotate twice, and the higher end of the opening end of the V-shaped rod 22 rotates and the solution bag 21 is cut by the cutting piece 232 by pulling the connecting cable 24, and the solution flows out from the accommodation groove 11, improving the dissolution speed of the bridge plug. In this device, the balls for the two ball throwings have the same size, so that the processing factory does not need two different molds for producing the balls, effectively reducing the use cost.

[0052] The above specific embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fast soluble bridge plug, characterized in that: include: A bridge plug body, wherein an inner wall of the bridge plug body is provided with a receiving groove; The dissolution-promoting component comprises a solution capsule and a V-shaped rod. The solution capsule is accommodated in the accommodating groove. The tip of the V-shaped rod is hinged to the inner wall of the bridge plug body. The open end of the V-shaped rod is connected to the solution capsule.

2. A fast soluble bridge plug according to claim 1, characterized in that: A rotation channel is provided at the bottom end of the accommodating groove, and the rotation channel is communicated with the interior of the accommodating groove and the bridge plug body respectively, and the tip of the V-shaped rod is hinged to the inner wall of the rotation channel.

3. A fast soluble bridge plug according to claim 2, characterized in that: The inner wall of the rotating channel is fixedly connected with a first shear pin, and the V-shaped rod is fixedly connected to the inner wall of the rotating channel through the first shear pin.

4. A fast soluble bridge plug according to claim 2, characterized in that: A second shear pin is fixedly connected to the inner wall of the rotating channel. The second shear pin is located at the open end of the V-shaped rod. The second shear pin is used to prevent the V-shaped rod from rotating.

5. A fast soluble bridge plug according to claim 2, characterized in that: A solution chamber cover is detachably connected between the containing tank and the rotating channel.

6. A fast soluble bridge plug according to claim 5, characterized in that: The solution chamber cover is provided with a connection hole, the connection hole accommodates a connection rope, two ends of the connection rope are respectively fixedly connected to the solution capsule and the V-shaped rod, and a cutting piece is provided at the top of the connection hole.

7. The fast soluble bridge plug according to claim 1, characterized in that: The open ends of the V-shaped rods are all provided with chamfers.

8. The fast soluble bridge plug according to claim 1, characterized in that: A ball seat is provided inside the bridge plug body.

9. The fast soluble bridge plug according to claim 1, characterized in that: The outer surface of the bridge plug body is sleeved with a push ring, a rubber cylinder, a ramp block, a slip and a guide shoe in sequence from top to bottom.

10. A fast soluble bridge plug according to claim 9, characterized in that: A push ring pin is fixedly connected between the push ring and the outer surface of the bridge plug body.

Images