Recyclable whipstock for ultra-short radius horizontal well

Abstract

The utility model discloses a recoverable whipstock for an ultra-short radius horizontal well, which relates to the technical field of drilling equipment and comprises a shell provided with a mounting hole. A clamp tooth is arranged in a mounting hole of the shell, and a compression spring is arranged between the clamp tooth and the shell; a valve block is arranged at the inner upper part of the shell; a piston is arranged between the valve block and the inner wall of the shell; the outer wall of the piston is of a conical structure with the lower portion being small in diameter, and the outer wall of the piston makes contact with the tong teeth. The limiting block is arranged between the piston and the shell, a first tooth-shaped structure is arranged on the limiting block, and a second tooth-shaped structure is arranged on the shell; the through hole and the flow channel are used for pushing the limiting block through fluid pressure in the lower valve block so as to overcome the elastic force of the thrust spring to enable the first tooth-shaped structure and the second tooth-shaped structure to be separated. According to the recoverable whipstock, the whipstock does not need to be disassembled after being used, the maintenance cost is greatly saved, the maintenance period is greatly shortened, rapid unblocking can be achieved, and the service life of the whipstock is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a retrievable whipstock for ultra-short radius horizontal wells. Background Art

[0002] Ultra-short radius horizontal wells have always been an important technical means for the development of thin oil layers. In the process of implementing ultra-short radius horizontal wells, the whipstock is one of the essential key tools.

[0003] At present, fixed whipstock and ball-throwing retrievable whipstock are more commonly used in the development of ultra-short radius horizontal wells, such as the whipstock with scraping function disclosed in the patent with publication number CN205577844U. Fixed whipstock cannot be recovered after the completion of ultra-short radius horizontal wells, which has an adverse effect on the secondary development of the reservoir. The ball-throwing retrievable whipstock is recovered by shearing the positioning pin with the ball-throwing pressure. After recovery, the whipstock needs to be disassembled, the positioning pins replaced and reassembled, and the later maintenance cost is high.

[0004] Therefore, there is an urgent need for a recyclable whipstock that can be quickly reused, has high operating efficiency, is easy to maintain, and can shorten the downhole operation cycle. Summary of the invention

[0005] The purpose of the present invention is to provide a retrievable whipstock for ultra-short radius horizontal wells, which is mainly used to guide the drilling tool so that it can quickly complete the drilling of the bevel section and thus realize horizontal operation.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] The utility model provides a retrievable whipstock for ultra-short radius horizontal wells, comprising a connecting joint, a valve block, a piston, a compression elastic member, a jaw, a shell, a limit block and a thrust elastic member; the lower end of the connecting joint is connected to the upper end of the shell; a plurality of mounting holes are evenly arranged on the side wall of the shell along the circumferential direction; the jaw is arranged in the mounting hole of the shell, and the compression elastic member is arranged between the jaw and the inner wall of the shell, and the compression elastic member is used to prevent the tooth tip of the jaw from extending out of the outer wall of the shell; the valve block is arranged in the shell; the piston is arranged between the valve block and the inner wall of the shell; the outer wall of the piston is a conical structure with a smaller diameter at the lower part, and the outer wall of the piston is connected to the jaw touch; the limit block is arranged between the lower outer wall of the piston and the inner wall of the shell, and a first tooth-shaped structure is arranged on the outer wall of the limit block, and a second tooth-shaped structure is arranged on the inner wall of the shell, and the first tooth-shaped structure matches the second tooth-shaped structure; the thrust elastic member is arranged between the limit block and the piston; a through hole is arranged at the lower part of the valve block, and a flow channel is arranged on the piston, one end of the flow channel is used to communicate with the through hole, and the other end of the flow channel extends to the side of the limit block facing the inner wall of the shell, and the through hole and the flow channel are used to push the limit block through the fluid pressure in the valve block to overcome the elastic force of the thrust elastic member to separate the first tooth-shaped structure from the second tooth-shaped structure.

[0008] Optionally, a plurality of mounting holes are evenly arranged on the side walls of the upper and lower middle parts of the shell along the circumferential direction; an upper jaw is arranged in the mounting hole of the upper middle part of the shell, a lower jaw is arranged in the mounting hole of the lower middle part of the shell, and an upper compression elastic member is arranged between the upper jaw and the inner wall of the shell, and a lower compression elastic member is arranged between the lower jaw and the inner wall of the shell, and the upper compression elastic member and the lower compression elastic member are used to prevent the tooth tips of the upper jaw and the lower jaw from protruding out of the outer wall of the shell; An upper valve block is provided at the inner upper part of the shell, and a lower valve block is provided at the inner lower part of the shell; an upper piston is provided between the upper valve block and the inner wall of the shell, and a lower piston is provided between the lower valve block and the inner wall of the shell; the outer walls of the upper piston and the lower piston are conical structures with a smaller diameter at the lower part, and the outer walls of the upper piston and the lower piston are in contact with the upper jaw and the lower jaw respectively; the upper valve block and the lower valve block are connected by the connecting rod; the limit block is provided on the outer side of the lower piston.

[0009] Optionally, a back plate is provided between the thrust elastic member and the piston.

[0010] Optionally, a sealing ring is provided between the upper outer wall of the piston and the inner wall of the outer shell.

[0011] Optionally, a pressure cover is provided on the top of the piston, and the pressure cover is used to keep the valve block and the piston axially fixed.

[0012] Optionally, the upper end of the connecting joint is connected to the lower end of the guide bevel, and the upper end bevel of the guide bevel is used to guide the upper drilling tool.

[0013] Optionally, the compression elastic member is a compression spring.

[0014] Optionally, the thrust elastic member is a thrust spring.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The utility model is a retrievable whipstock for ultra-short radius horizontal wells. It adopts a compression spring push method. After use, the whipstock does not need to be disassembled, which greatly saves maintenance costs and cycles. The rotary unsealing method can achieve rapid unsealing, effectively prolonging the service life of the whipstock. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the initial state structure of the retrievable whipstock for ultra-short radius horizontal wells in the utility model;

[0019] Figure 2 A schematic diagram of the setting structure of the whipstock of the retrievable whipstock for ultra-short radius horizontal wells in the utility model;

[0020] Figure 3 A schematic diagram of the unsealing structure of the whipstock of the retrievable whipstock for ultra-short radius horizontal wells in the utility model;

[0021] Figure 4 The utility model is a schematic diagram of the jaw distribution structure of the recoverable whipstock for ultra-short radius horizontal wells.

[0022] Description of reference numerals:

[0023] 1. Guide bevel; 2. Connecting joint; 3. Upper pressure cover; 4. Sealing ring; 5. Upper valve block; 6. Upper piston; 7. Upper compression spring; 8. Upper jaws; 9. Connecting rod; 10. Housing; 11. Lower pressure cover; 12. Lower valve block; 13. Lower piston; 14. Lower compression spring; 15. Lower jaws; 16. Limit block; 17. Thrust spring; 18. Back plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The purpose of the present invention is to provide a retrievable whipstock for ultra-short radius horizontal wells to solve the problems existing in the prior art, achieve rapid reuse, high operating efficiency and easy maintenance, and shorten the downhole operation cycle.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 4 As shown, the present embodiment provides a recoverable whipstock for ultra-short radius horizontal wells, including a guide bevel 1, a connecting joint 2, an upper pressure cover 3, a sealing ring 4, an upper valve block 5, an upper piston 6, an upper compression spring 7, an upper jaw 8, a connecting rod 9, an outer shell 10, a lower pressure cover 11, a lower valve block 12, a lower piston 13, a lower compression spring 14, a lower jaw 15, a limit block 16, a thrust spring 17 and a back plate 18.

[0028] The upper bevel of the guide bevel 1 is used to guide the upper drilling tool and is connected to the connecting joint 2 by welding. A plurality of mounting holes are evenly arranged on the side walls of the upper and lower middle parts of the housing 10 along the circumferential direction; an upper jaw 8 is arranged in the mounting hole of the upper middle part of the housing 10, and a lower jaw 15 is arranged in the mounting hole of the lower middle part of the housing 10, and an upper compression spring 7 is arranged between the upper jaw 8 and the inner wall of the housing 10, and a lower compression spring 14 is arranged between the lower jaw 15 and the inner wall of the housing 10, and the upper compression spring 7 and the lower compression spring 14 are used to prevent the tips of the upper jaw 8 and the lower jaw 15 from protruding out of the housing 10. The outer wall of the outer shell 10; an upper valve block 5 is provided at the inner upper part of the outer shell 10, and a lower valve block 12 is provided at the inner lower part of the outer shell 10; an upper piston 6 is provided between the upper valve block 5 and the inner wall of the outer shell 10, and a lower piston 13 is provided between the lower valve block 12 and the inner wall of the outer shell 10; the outer walls of the upper piston 6 and the lower piston 13 are conical structures with a smaller diameter at the lower part, and the outer walls of the upper piston 6 and the lower piston 13 are in contact with the upper jaw 8 and the lower jaw 15 respectively; the upper valve block 5 and the lower valve block 12 are connected by a connecting rod 9.

[0029] The upper jaw teeth 8 and the lower jaw teeth 15 are 3 in number and are evenly distributed on the housing 10.

[0030] The limit block 16 is arranged between the lower outer wall of the lower piston 13 and the inner wall of the outer shell 10, and a first tooth-shaped structure is arranged on the outer wall of the limit block 16, and a second tooth-shaped structure is arranged on the inner wall of the outer shell 10, and the first tooth-shaped structure matches the second tooth-shaped structure; a thrust spring 17 is arranged between the limit block 16 and the lower piston 13; a through hole is arranged at the lower part of the lower valve block 12, and a flow channel is arranged on the lower piston 13, one end of the flow channel is used to communicate with the through hole, and the other end of the flow channel extends to the side of the limit block 16 facing the inner wall of the outer shell 10, and the through hole and the flow channel are used to push the limit block 16 through the fluid pressure in the lower valve block 12 to overcome the elastic force of the thrust spring 17 to separate the first tooth-shaped structure from the second tooth-shaped structure.

[0031] A back plate 18 is provided between the thrust spring 17 and the piston. The back plate 18 is installed on the inner side of the lower valve block 12 to support the thrust spring 17.

[0032] A sealing ring 4 is provided between the upper outer wall of the piston and the inner wall of the housing 10 .

[0033] The upper pressure cover 3 is threadedly connected to the upper piston 6, and the lower pressure cover 11 is threadedly connected to the lower piston 13, ensuring that the upper valve block 5 and the lower valve block 12 always cooperate with the upper piston 6 and the upper piston 6 during the upward movement.

[0034] The upper end of the connecting joint 2 is connected to the lower end of the guide bevel 1, and the upper end bevel of the guide bevel 1 is used to guide the upper drilling tool.

[0035] During operation, the upper end of the fishing rod is connected to the mud pipeline, and the lower end of the fishing rod is connected to the threaded hole of the connecting joint 2, so that the whipstock is lowered to the target layer. After the pump is turned on, the drilling fluid pushes the upper valve block 5 and drives the upper piston 6 to move downward. At the same time, since the upper valve block 5 is connected to the lower valve block 12 through the connecting rod 9, the lower valve block 12 and the lower piston 13 cooperate to act synchronously, so the upper valve block 5, the upper piston 6, the connecting rod 9, the lower valve block 12 and the lower piston 13 move downward synchronously under the action of the drilling fluid. The upper piston 6 and the lower piston 13 are sealed with the housing 10 by the sealing ring 4. During the downward movement of the upper piston 6 and the lower piston 13, the upper jaw 8 and the lower jaw 15 are pushed out synchronously, and the upper jaw 8 and the lower jaw 15 are always in contact with the housing 10, the upper piston 6, and the lower piston 13 under the action of the upper compression spring 7 and the lower compression spring 14 respectively. At the same time, the limit block 16 moves downward. Under the action of the thrust spring 17, the limit block 16 is always in contact with the inner side of the housing 10, and the outer side of the limit block 16 cooperates with the inner side of the housing 10 ( Figure 2 ), adopts an asymmetric tooth structure, so that it can only move downward. When the lower end surface of the piston contacts the upper end surface of the jaws, the jaws extend to the maximum position ( Figure 2 ), at which time the pump pressure tends to be stable and no longer changes. After the pump is turned off, due to the matching of the tooth shape of the limit block 16 and the housing 10, the position of the clamp teeth remains unchanged, and the whipstock is set.

[0036] After the side drilling operation is completed, the salvage rod is lowered to connect to the upper valve block 5. Two through holes are machined at the bottom of the lower valve block 12, and two flow channels are machined at the lower piston 13. The through holes and the flow channels are initially at 90°. Rotating the salvage rod drives the lower valve block 12 to rotate at the same time. After rotating 90°, the through hole at the bottom of the lower valve block 12 is connected to the flow channel of the lower piston 13, and the drilling fluid enters the flow channel, pushing the limit block 16 to compress the thrust spring 17 for recovery, so that the limit block 16 is disengaged from the tooth shape of the outer shell 10. The upper jaws 8 and the lower jaws 15 shrink back under the action of the formation pressure, and at the same time push the upper and lower pistons and the upper and lower valve blocks to be recovered together, and the bevel device is unsealed. Lift the salvage rod, and the bevel device is recovered. Figure 3 shown.

[0037] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A retrievable whipstock for ultra-short radius horizontal wells, characterized in that: It includes a connecting joint, a valve block, a piston, a compression elastic member, a jaw, a shell, a limit block and a thrust elastic member; the lower end of the connecting joint is connected to the upper end of the shell; a plurality of mounting holes are evenly arranged on the side wall of the shell along the circumferential direction; the jaw is arranged in the mounting hole of the shell, and the compression elastic member is arranged between the jaw and the inner wall of the shell, and the compression elastic member is used to prevent the tooth tip of the jaw from extending out of the outer wall of the shell; the valve block is arranged in the shell; the piston is arranged between the valve block and the inner wall of the shell; the outer wall of the piston is a conical structure with a smaller diameter at the lower part, and the outer wall of the piston is in contact with the jaw; the limit block is arranged on the movable A first tooth-shaped structure is arranged between the lower outer wall of the plug and the inner wall of the outer shell, and a second tooth-shaped structure is arranged on the outer wall of the limit block, and the first tooth-shaped structure matches the second tooth-shaped structure; the thrust elastic member is arranged between the limit block and the piston; a through hole is arranged at the lower part of the valve block, and a flow channel is arranged on the piston, one end of the flow channel is used to communicate with the through hole, and the other end of the flow channel extends to the side of the limit block facing the inner wall of the outer shell, and the through hole and the flow channel are used to push the limit block through the fluid pressure in the valve block to overcome the elastic force of the thrust elastic member to separate the first tooth-shaped structure from the second tooth-shaped structure.

2. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: A plurality of mounting holes are evenly arranged on the side walls of the upper and lower middle parts of the shell along the circumferential direction; an upper jaw is arranged in the mounting hole of the upper middle part of the shell, a lower jaw is arranged in the mounting hole of the lower middle part of the shell, and an upper compression elastic member is arranged between the upper jaw and the inner wall of the shell, and a lower compression elastic member is arranged between the lower jaw and the inner wall of the shell, and the upper compression elastic member and the lower compression elastic member are used to prevent the tooth tips of the upper jaw and the lower jaw from protruding out of the outer wall of the shell; the outer An upper valve block is provided at the inner upper part of the shell, and a lower valve block is provided at the inner lower part of the shell; an upper piston is provided between the upper valve block and the inner wall of the shell, and a lower piston is provided between the lower valve block and the inner wall of the shell; the outer walls of the upper piston and the lower piston are conical structures with a smaller diameter at the lower part, and the outer walls of the upper piston and the lower piston are in contact with the upper jaw and the lower jaw respectively; the upper valve block and the lower valve block are connected by a connecting rod; the limit block is provided on the outer side of the lower piston.

3. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: A back plate is arranged between the thrust elastic member and the piston.

4. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: A sealing ring is arranged between the upper outer wall of the piston and the inner wall of the shell.

5. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: A pressure cover is arranged on the top of the piston, and the pressure cover is used to keep the valve block and the piston axially fixed.

6. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: The upper end of the connecting joint is connected to the lower end of the guide bevel, and the upper end bevel of the guide bevel is used for guiding the upper drilling tool.

7. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: The compression elastic member is a compression spring.

8. The retrievable whipstock for ultra-short radius horizontal wells according to claim 1, characterized in that: The thrust elastic member is a thrust spring.

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