Self-locking type drilling bypass valve

Abstract

The self-locking type drilling bypass valve comprises an outer cylinder, a valve element is arranged in the outer cylinder, the lower end of the valve element is connected with a nozzle, the lower end of the nozzle is connected with an elastic device, the outer cylindrical surface of the upper end of the valve element is sleeved with an elastic claw, an elastic claw boss is arranged at the upper end of the elastic claw, and the lower end of the elastic claw is fixed into the outer cylinder; the valve element is fixed in the outer barrel through the shear pin, the elastic device is in a compressed state, at the moment, the bypass channel is opened, the inner channel is closed, after the shear pin shears, the valve element rebounds under the action of the elastic device, at the moment, the bypass channel is closed, the inner channel is opened, and when the elastic claw boss is clamped into the elastic claw groove, self-locking is achieved. Switching from bypass circulation to internal circulation can be achieved by increasing the displacement of drilling fluid in the pipe column, the operation does not need to start and stop the slurry pump many times, and the operation efficiency is greatly improved; and the tool has a self-locking function when the inner channel circulates, a bypass under large-displacement drilling fluid cannot be opened accidentally, and the operation safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas development, and particularly relates to a self-locking drilling bypass valve. Background Art

[0002] In the middle and late stages of production in offshore oil and gas fields, in order to increase the oil drainage area of the reservoir and improve the oil and gas field recovery rate, the multilateral well technology has become a key means for the oil industry to increase production and efficiency. This technology refers to drilling multiple branch wellbores in the main wellbore to achieve multi-target and three-dimensional exploitation in one well, thereby improving the reservoir recovery rate and economic benefits.

[0003] During the process of multilateral well window-opening operation, for a high-temperature reservoir environment, in order to ensure the stable operation of the directional instrument, it is necessary to implement a small-displacement mud circulation measure to effectively reduce its working temperature. After the whipstock is accurately lowered to the preset depth, the system string design needs to construct a circulation channel for the directional instrument to adjust the accurate position of the whipstock tool face. Once the tool face is accurately adjusted, it is necessary to immediately close this circulation channel and then construct an independent channel inside the string to achieve the effective setting operation of the hydraulic anchor.

[0004] In the prior art, there are two tools to achieve the above functions:

[0005] One is a multi-functional circulation valve, whose operation requires the mud pump to be opened and closed five times repeatedly to establish the required internal circulation channel. The structure is relatively complex and the efficiency is low;

[0006] The other is a flow valve. Due to the nozzle designed inside it, the available displacement is limited. The tool lacks a self-locking function under high-displacement drilling fluid in the string, and it is easy to induce accidental re-opening of the bypass circulation, thus unable to meet the requirements of high-displacement circulating drilling fluid, significantly restricting the safety and efficiency of the operation. Summary of the Invention

[0007] The problem to be solved by the present invention is to provide a self-locking drilling bypass valve, which can realize the conversion from bypass circulation to internal circulation by increasing the drilling fluid displacement inside the string, without the need to start and stop the mud pump multiple times, greatly improving the operation efficiency; and it has a self-locking function, and the bypass will not accidentally open under high-displacement drilling fluid, improving the operation safety.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: a self-locking drilling bypass valve, which includes an upper joint, an outer cylinder, and a lower joint connected in sequence from top to bottom. The outer cylinder is a hollow cylinder. A valve core is arranged inside the outer cylinder. The valve core is coaxial with the outer cylinder. The lower end of the valve core is connected to a nozzle, and the lower end of the nozzle is connected to an elastic device. An elastic claw is sleeved on the outer cylindrical surface of the upper end of the valve core. An elastic claw boss is arranged at the upper end of the elastic claw. The lower end of the elastic claw is fixed inside the outer cylinder through a fixing pin. An elastic claw groove for accommodating the elastic claw boss is arranged on the outer cylindrical surface of the valve core. The valve core is fixed inside the outer cylinder through a shear pin, so that the elastic device is in a compressed state. At this time, the bypass channel is opened and the inner channel is closed. The compression amount of the elastic device is greater than the distance between the elastic claw boss and the elastic claw groove. When the shear pin is sheared, the valve core rebounds under the action of the elastic device. At this time, the bypass channel is closed and the inner channel is opened. When the elastic claw boss is stuck into the elastic claw groove, self-locking is achieved.

[0009] Further, several circular holes are arranged in the middle of the outer cylinder. The circular holes are communicated with the hollow structure of the outer cylinder. Several circular grooves are arranged in the middle of the valve core. The circular grooves are communicated with the hollow structure of the valve core. When the circular holes coincide with the circular grooves, the bypass channel is opened.

[0010] Further, several threaded holes are arranged below the circular holes. A pressure balance hole is arranged below the threaded holes. The pressure balance hole is communicated with the hollow structure of the outer cylinder. A concave platform is arranged in the upper middle part of the inner cylindrical surface of the outer cylinder. The inner diameter of the concave platform is larger than the inner diameter of the hollow structure of the outer cylinder. The elastic claw is placed in the concave platform.

[0011] Further, the valve core is in the shape of a hollow truncated cone. The outer diameter of the valve core gradually decreases from top to bottom. The outer cylindrical surface of the valve core is sequentially provided with a third sealing groove hole, the elastic claw groove, the circular groove, a fourth sealing groove hole, a shear pin groove, and a fifth sealing groove hole from top to bottom. A third sealing ring is placed in the third sealing groove hole. The elastic claw boss of the rebounded elastic claw is placed in the elastic claw groove. The circular groove cooperates with the circular hole to form the bypass channel. A fourth sealing ring is placed in the fourth sealing groove hole. When the elastic device is in a compressed state, the fourth sealing ring is placed below the circular hole. After the elastic device rebounds, the fourth sealing ring is placed above the circular hole to block the communication between the inner channel and the outer channel. A shear pin is placed in the shear pin groove to fix the valve core inside the outer cylinder. A fifth sealing ring is placed in the fifth sealing groove hole. A sixth sealing groove hole and a first internal thread are arranged in the lower part of the inner cylindrical surface of the valve core. A sixth sealing ring is placed in the sixth sealing groove hole. The first internal thread is connected to the nozzle.

[0012] Further, the nozzle is a hollow cylinder. The upper part of the outer cylindrical surface of the nozzle is provided with a first external thread, which is matched with the first internal thread to realize the connection between the nozzle and the valve core. The lower part of the inner cylindrical surface of the nozzle is connected to the elastic device.

[0013] Further, the elastic device is a spring. The spring is sleeved on the outer cylindrical surface of the spring support seat. The spring support seat is connected below the nozzle. The upper part of the spring support seat is provided with a seventh sealing groove hole, and a seventh sealing ring is arranged in the seventh sealing groove hole. The bottom of the spring support seat is provided with an upward hollow structure, and the hollow structure of the spring support seat does not penetrate to the top of the spring support seat. The outer cylindrical surface of the hollow structure of the spring support seat is provided with a plurality of through holes, and the through holes are communicated with the hollow structure of the spring support seat to form an inner channel.

[0014] Further, the elastic claw is a hollow cylinder. The lower part of the outer cylindrical surface of the elastic claw is provided with a pin groove for placing the fixing pin. The upper part of the elastic claw is a plurality of elastic claw hands distributed in a circumference. The top of the elastic claw hand is a convex platform protruding inward. In the natural state, the elastic claw hands contract inward, and the elastic claw hands have the extensibility to stretch outward.

[0015] Further, the upper joint is a hollow cylinder. The lower part of the upper joint is provided with a second external thread, and the upper end of the outer cylinder is provided with a second internal thread. The second external thread is matched with the second internal thread to realize the connection between the upper joint and the outer cylinder. The other end of the upper joint is connected to a directional instrument.

[0016] Further, the lower joint is a hollow cylinder. The lower part of the lower joint is provided with a third external thread, and the lower end of the outer cylinder is provided with a third internal thread. The third external thread is matched with the third internal thread to realize the connection between the lower joint and the outer cylinder. The other end of the lower joint is connected to a hydraulic setting type anchor.

[0017] Further, a first sealing ring is arranged between the upper joint and the outer cylinder, and a second sealing ring is arranged between the lower joint and the outer cylinder.

[0018] The advantages and positive effects of the present invention are:

[0019] The present invention can realize the conversion from bypass circulation to internal circulation by increasing the displacement of the drilling fluid inside the pipe string. This operation does not require starting and stopping the mud pump multiple times, greatly improving the operation efficiency. When the inner channel is circulating, the tool has a self-locking function, and the bypass will not be accidentally opened under high-displacement drilling fluid, improving the operation safety. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 It is a partially enlarged view of the initial downhole state of an embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the state after the shear pin of an embodiment of the present invention is sheared.

[0023] Figure 4 In an embodiment of the present invention Figure 3 Partially enlarged view.

[0024] Figure 5 It is a schematic diagram of the state when the bypass is closed and the inner channel is opened in an embodiment of the present invention.

[0025] Figure 6 In an embodiment of the present invention Figure 5 Partially enlarged view.

[0026] Figure 7 It is a schematic diagram of the tool self-locking state when the bypass is closed and the inner channel is opened in an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the spool structure in an embodiment of the present invention.

[0028] Figure 9 It is a schematic diagram of the elastic claw structure in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Upper sub; 2. Outer cylinder; 2-1. Round hole;

[0031] 2-2. Concave platform; 3. Spool; 3-1. Third sealing groove hole;

[0032] 3-2. Elastic claw groove; 3-3. Round groove; 3-4. Fourth sealing groove hole;

[0033] 3-5. Shear pin groove; 3-6. Fifth sealing groove hole; 3-7. Sixth sealing groove hole;

[0034] 4. Elastic claw; 4-1. Elastic claw boss; 4-2. Pin groove;

[0035] 4-3. Elastic claw hand; 5. Fixed pin; 6. Shear pin;

[0036] 7. Nozzle; 8. Spring support seat; 8-1. Seventh sealing groove hole;

[0037] 8-2. Through hole; 9. Spring; 10. Lower sub;

[0038] 11. First sealing ring; 12. Second sealing ring; 13. Third sealing ring;

[0039] 14. Fourth sealing ring; 15. Fifth sealing ring; 16. Sixth sealing ring;

[0040] 17. The seventh sealing ring; 18. The spring chamber. Specific embodiments

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] The following further describes the embodiments of the present invention with reference to the accompanying drawings:

[0043] As Figure 1 shown, a self-locking drilling bypass valve includes an upper joint 1, an outer cylinder 2, and a lower joint 10 connected in sequence from top to bottom. The outer cylinder 2 is a hollow cylinder, and a valve core 3 is arranged inside the outer cylinder 2. The valve core 3 is coaxial with the outer cylinder 2. The lower end of the valve core 3 is connected to a nozzle 7, and the lower end of the nozzle 7 is connected to an elastic device. An elastic claw 4 is sleeved on the outer cylindrical surface of the upper end of the valve core 3. An elastic claw boss 4-1 is arranged at the upper end of the elastic claw 4. The lower end of the elastic claw 4 is fixed inside the outer cylinder 2 through a fixing pin 5. An elastic claw groove 3-2 for accommodating the elastic claw boss 4-1 is arranged on the outer cylindrical surface of the valve core 3. The valve core 3 is fixed inside the outer cylinder 2 through a shear pin 6, so that the elastic device is in a compressed state. There is a certain distance between the lower edge of the upper step on the outer cylindrical surface of the valve core 3 and the elastic claw 4, which is used for shearing the shear pin 6 under the large displacement of drilling fluid in the pipe string. As Figure 2 shown, at this time, the circular groove 3-3 in the middle of the outer cylindrical surface of the valve core 3 corresponds to the circular hole 2-1 of the outer cylinder 2, the bypass channel is opened, and the inner channel is closed. The compression amount of the elastic device is greater than the distance between the elastic claw boss 4-1 and the elastic claw groove 3-2. After the shear pin 6 is sheared, as Figure 3 、 Figure 4 shown, the valve core 3 rebounds under the action of the elastic device. As Figure 5 、 Figure 6 shown, at this time, the bypass channel is closed and the inner channel is opened. When the elastic claw boss 4-1 is stuck into the elastic claw groove 3-2, as Figure 7 shown, self-locking is achieved.

[0044] Specifically, several circular holes 2-1 are arranged in the middle of the outer cylinder 2. The circular holes 2-1 are communicated with the hollow structure of the outer cylinder 2. Several circular grooves 3-3 are arranged in the middle of the valve core 3. The circular grooves 3-3 are communicated with the hollow structure of the valve core 3. When the circular holes 2-1 coincide with the circular grooves 3-3, the bypass channel is opened. Preferably, several threaded holes are arranged below the circular holes 2-1, and pressure balance holes are arranged below the threaded holes. The pressure balance holes are communicated with the hollow structure of the outer cylinder 2. A concave platform 2-2 is arranged in the upper middle part of the inner cylindrical surface of the outer cylinder 2. The inner diameter of the concave platform 2-2 is larger than the inner diameter of the hollow structure of the outer cylinder 2. The elastic claw 4 is placed in the concave platform 2-2.

[0045] As shown Figure 8 in the figure, the valve core 3 is in the shape of a hollow truncated cone and is placed on the inner cylindrical surface of the outer cylinder 2. The outer diameter of the valve core 3 gradually decreases from top to bottom. The outer cylindrical surface of the valve core 3 is successively provided with a third sealing groove hole 3-1, an elastic claw groove 3-2, a circular groove 3-3, a fourth sealing groove hole 3-4, a shear pin groove 3-5, and a fifth sealing groove hole 3-6 from top to bottom. A third sealing ring 13 is placed in the third sealing groove hole 3-1 to achieve sealing between the upper part of the outer cylinder 2 and the upper part of the valve core 3. The elastic claw groove 3-2 is placed with a resilient elastic claw boss 4-1 to achieve self-locking. The outer diameter of the lower part of the outer cylindrical surface of the elastic claw groove 3-2 is smaller than the outer diameter of the elastic claw groove 3-2. The circular groove 3-3 penetrates to the inner cylindrical surface, and the circular groove 3-3 cooperates with the circular hole 2-1 to form a bypass channel. A fourth sealing ring 14 is placed in the fourth sealing groove hole 3-4. When the elastic device is in a compressed state, the fourth sealing ring 14 is placed below the circular hole 2-1 to achieve sealing between the upper middle part of the outer cylinder 2 and the middle part of the valve core 3. When the elastic device rebounds, the fourth sealing ring 14 is placed above the circular hole 2-1 to block the communication between the inner channel and the outer channel. A shear pin 6 is placed in the shear pin groove 3-5 to fix the valve core 3 inside the outer cylinder 2. A fifth sealing ring 15 is placed in the fifth sealing groove hole 3-6 to achieve sealing inside the spring cavity 18. A reduced diameter step is provided in the middle of the inner cylindrical surface of the valve core 3. As shown Figure 1 in the figure, a sixth sealing groove hole 3-7 and a first internal thread are provided in the lower part of the inner cylindrical surface of the valve core 3. A sixth sealing ring 16 is placed in the sixth sealing groove hole 3-7 to achieve sealing between the nozzle 7 and the valve core 3. The first internal thread connects the nozzle 7. Preferably, a first external thread is provided on the upper part of the outer cylindrical surface of the nozzle 7, and the first external thread cooperates with the first internal thread to achieve the connection between the nozzle 7 and the valve core 3.

[0046] The nozzle 7 is a hollow cylinder. The nozzle 7 is placed inside the valve core 3. A step with an outer diameter larger than the major diameter of the thread is provided in the lower part of the outer cylindrical surface of the nozzle 7. The inner diameter of the upper part of the inner cylindrical surface of the nozzle 7 is smaller than that of the lower part of the inner cylindrical surface and is uniformly tapered. The upper part of the inner cylindrical surface of the nozzle 7 is adapted to the spring support seat 8. Specifically, the lower part of the inner cylindrical surface of the nozzle 7 is connected to the elastic device. Specifically, as shown Figure 1 in the figure, the elastic device provided in this embodiment is a spring 9. The spring 9 is sleeved on the outer cylindrical surface of the spring support seat 8. The spring support seat 8 is connected below the nozzle 7. A seventh sealing groove hole 8-1 is provided in the upper part of the spring support seat 8. A seventh sealing ring 17 is provided in the seventh sealing groove hole 8-1 to achieve sealing between the spring support seat 8 and the nozzle 7. The outer diameter of the lower part of the outer cylindrical surface of the spring support seat 8 is larger than that of the upper part of the outer cylindrical surface of the spring support seat 8 and is adapted to the step of the lower joint 10. A hollow structure is provided upward at the bottom of the spring support seat 8. The hollow structure of the spring support seat 8 does not penetrate to the top of the spring support seat 8. A plurality of through holes 8-2 are provided on the outer cylindrical surface of the hollow structure of the spring support seat 8. The through holes 8-2 communicate with the hollow structure of the spring support seat 8 to form an inner channel.

[0047] As shown Figure 9As shown, the elastic claw 4 is a hollow cylinder. A pin groove 4-2 is provided at the lower part of the outer cylindrical surface of the elastic claw 4 for placing the fixing pin 5 screwed into from the outer periphery of the outer cylinder 2. The fixing pin 5 fixes the elastic claw 4 in the concave platform 2-2 of the valve core 3. The upper part of the elastic claw 4 is several elastic claw hands 4-3 distributed in a circumferential manner. The top of the elastic claw hand 4-3 is an inwardly protruding elastic claw boss 4-1. In the natural state, the elastic claw 4 will contract inwardly and has a certain elasticity to stretch outward.

[0048] The upper joint 1 is a hollow cylinder. A second external thread is provided at the lower part of the upper joint 1. A second internal thread is provided at the upper end of the outer cylinder 2. The second external thread is matched with the second internal thread to realize the connection between the upper joint 1 and the outer cylinder 2. The other end of the upper joint 1 is connected to the directional instrument. Preferably, a first sealing ring 11 is provided between the upper joint 1 and the outer cylinder 2 provided in this embodiment.

[0049] The lower joint 10 is a hollow cylinder. A third external thread is provided at the lower part of the lower joint 10. A third internal thread is provided at the lower end of the outer cylinder 2. The third external thread is matched with the third internal thread to realize the connection between the lower joint 10 and the outer cylinder 2. The other end of the lower joint 10 is connected to the hydraulic setting type anchor. Preferably, a second sealing ring 12 is provided between the lower joint 10 and the outer cylinder 2. As Figure 1 shown, a step adapted to the outer cylindrical surface of the nozzle 7 is provided at the upper part of the inner cylindrical surface of the lower joint 10.

[0050] The working principle of the present invention is as follows:

[0051] When the pipe string is lowered, as Figure 2 shown, the bypass valve is placed below the directional instrument and above the hydraulic setting type anchor. The drilling fluid in the pipe string passes through the directional instrument and the bypass valve in sequence. After flowing through the circular groove 3-3 of the valve core 3 of the bypass valve and the circular hole 2-1 of the outer cylinder 2, it enters the annulus between the pipe string and the wellbore and returns to the wellhead. During the lowering process of the pipe string, the drilling fluid can cool the directional instrument. After being lowered in place, the circulating drilling fluid can drive the directional instrument to maintain the starting state and control the adjustment of the whipstock tool face. After the adjustment is completed, the displacement of the drilling fluid in the pipe string is increased, and a pressure difference is formed between the cavity above the top of the spring support seat 8 and the spring cavity 18. As Figure 3 、 Figure 4 shown, the valve core 3 moves downward to shear the shear pin 6. The valve core 3 together with the nozzle 7 moves upward under the action of the spring 9. The elastic claw boss 4-1 at the upper part of the elastic claw 4 contracts inwardly to the elastic claw groove 3-2 on the outer cylindrical surface of the valve core 3 to realize self-locking. At this time, the fourth sealing ring 14 moves to above the circular hole 2-1 of the outer cylinder 2. The valve core 3 blocks the internal and external channels of the bypass valve. The lower part of the inner cylindrical surface of the nozzle 7 moves to the upper part of the spring support seat 8, and the shaft hole seal cooperation is disengaged. The drilling fluid in the pipe string can pass through the valve core 3 and the nozzle 7 in sequence and enter the spring cavity 18, and then migrate to the inside of the lower joint 10 through the through hole 8-2 at the lower part of the spring support seat 8, thereby establishing a circulation and pressure transmission channel for the drilling fluid inside the bypass valve and providing a setting pressure for the hydraulic setting type anchor.

[0052] The advantages and positive effects of the present invention are as follows:

[0053] The present invention can achieve the conversion from bypass circulation to internal circulation by increasing the displacement of drilling fluid inside the pipe string. This operation does not require starting and stopping the mud pump multiple times, greatly improving the operation efficiency. When the inner channel is in circulation, the tool has a self-locking function, and the bypass will not accidentally open under high-displacement drilling fluid, improving the operation safety.

[0054] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. A self-locking drilling bypass valve, characterized in that: The spool is a valve core, and the valve core is coaxial with the outer cylinder. The lower end of the valve core is connected to the nozzle. The lower end of the nozzle is connected to the elastic device. An elastic claw is sleeved on the outer cylindrical surface of the upper end of the valve core. The upper end of the elastic claw is provided with an elastic claw boss. The lower end of the elastic claw is fixed to the outer cylinder by a fixing pin. The outer cylindrical surface of the valve core is provided with an elastic claw groove for accommodating the elastic claw boss. The valve core is fixed to the outer cylinder by a shear pin, so that the elastic device is in a compressed state. At this time, the bypass channel is opened and the inner channel is closed. The compression amount of the elastic device is greater than the distance between the elastic claw boss and the elastic claw groove. After the shear pin is sheared, the valve core rebounds under the action of the elastic device. At this time, the bypass channel is closed and the inner channel is opened. When the elastic claw boss is stuck in the elastic claw groove, self-locking is achieved.

2. A self-locking drilling bypass valve according to claim 1, characterized in that: A plurality of circular holes are provided in the middle of the outer cylinder, and the circular holes are communicated with the hollow structure of the outer cylinder. A plurality of circular grooves are provided in the middle of the valve core, and the circular grooves are communicated with the hollow structure of the valve core. When the circular holes coincide with the circular grooves, the bypass channel is opened.

3. A self-locking drilling bypass valve according to claim 2, characterized in that: A plurality of threaded holes are provided at the lower part of the circular hole, a pressure balance hole is provided below the threaded hole, the pressure balance hole is communicated with the hollow structure of the outer cylinder, a concave platform is provided at the upper middle part of the inner cylindrical surface of the outer cylinder, the inner diameter of the concave platform is larger than the inner diameter of the hollow structure of the outer cylinder, and the elastic claw is placed in the concave platform.

4. A self-locking drilling bypass valve according to claim 2 or 3, characterized in that: The valve core is in the shape of a hollow frustum, and the outer diameter of the valve core gradually decreases from top to bottom. The outer cylindrical surface of the valve core is provided with a third sealing slot hole, the elastic claw groove, the circular groove, the fourth sealing slot hole, the shear pin groove and the fifth sealing slot hole in sequence from top to bottom. A third sealing ring is placed in the third sealing slot hole, a rebounding elastic claw boss is placed in the elastic claw groove, the circular groove cooperates with the circular hole to form the bypass channel, a fourth sealing ring is placed in the fourth sealing slot hole, when the elastic device is in a compressed state, the fourth sealing ring is placed below the circular hole, and when the elastic device rebounds, the fourth sealing ring is placed above the circular hole to block the communication between the inner channel and the outer channel, a shear pin groove is placed in the shear pin groove to fix the valve core inside the outer cylinder, a fifth sealing ring is placed in the fifth sealing slot hole, a sixth sealing slot hole and a first internal thread are provided at the lower part of the inner cylindrical surface of the valve core, a sixth sealing ring is placed in the sixth sealing slot hole, and the first internal thread is connected to the nozzle.

5. A self-locking drilling bypass valve according to claim 4, characterized in that: The nozzle is a hollow cylinder, and a first external thread is provided on the upper portion of the outer cylindrical surface of the nozzle. The first external thread cooperates with the first internal thread to achieve the connection between the nozzle and the valve core, and the lower portion of the inner cylindrical surface of the nozzle is connected to the elastic device.

6. A self-locking drilling bypass valve according to any one of claims 1 to 3, characterized in that: The elastic device is a spring, and the spring is sleeved on the outer cylindrical surface of the spring support seat. The spring support seat is connected to the bottom of the nozzle. A seventh sealing slot is provided on the upper part of the spring support seat, and a seventh sealing ring is provided in the seventh sealing slot. A hollow structure is provided upward from the bottom of the spring support seat, and the hollow structure of the spring support seat does not penetrate to the top of the spring support seat. A plurality of through holes are provided on the outer cylindrical surface of the hollow structure of the spring support seat, and the through holes are connected with the hollow structure of the spring support seat to form an inner channel.

7. A self-locking drilling bypass valve according to any one of claims 1 to 3, characterized in that: The elastic claw is a hollow cylinder, and a pin groove is provided at the lower part of the outer cylindrical surface of the elastic claw for placing the fixing pin. The upper part of the elastic claw is a plurality of elastic claw hands distributed in a circle, and the top of the elastic claw hand is a boss protruding inward. In a natural state, the elastic claw hand contracts inward, and the elastic claw hand has the ability to stretch outward.

8. A self-locking drilling bypass valve according to any one of claims 1 to 3, characterized in that: The upper joint is a hollow cylinder, the lower part of the upper joint is provided with a second external thread, the upper end of the outer tube is provided with a second internal thread, the second external thread cooperates with the second internal thread to realize the connection between the upper joint and the outer tube, and the other end of the upper joint is connected to the directional instrument.

9. A self-locking drilling bypass valve according to any one of claims 1 to 3, characterized in that: The lower joint is a hollow cylinder, the lower part of which is provided with a third external thread, the lower end of the outer tube is provided with a third internal thread, the third external thread cooperates with the third internal thread to realize the connection between the lower joint and the outer tube, and the other end of the lower joint is connected to a hydraulic sealing anchor.

10. A self-locking drilling bypass valve according to claims 1 to 3, characterized in that: A first sealing ring is arranged between the upper joint and the outer tube, and a second sealing ring is arranged between the lower joint and the outer tube.

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