Tool for track control of track-controllable ultra-short radius drilling well

Abstract

The utility model relates to the technical field of drill rods, and provides a tool for track control of a track-controllable ultra-short radius drilling well, which comprises a transmission shaft assembly, a universal shaft assembly, a motor assembly, an anti-falling assembly and a bypass valve assembly, the transmission shaft assembly, the cardan shaft assembly, the motor assembly, the anti-falling assembly and the bypass valve assembly are sequentially assembled in an inserted mode, and a blocking mechanism is arranged in the bypass valve assembly. The blocking mechanism comprises a blocking rod, a rod female thread and a plug hexagon; the plug rod is inserted into the bypass valve assembly, the rod female thread is arranged at one end of the plug rod, and the plug hexagon is arranged on one end face of the rod female thread. By means of the technical scheme, the problem that in the prior art, when a bypass valve is used, the discharge position of a valve port is limited is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of drill pipes, and specifically, to a tool for trajectory control of ultra-short radius drilling with controllable trajectory. Background Art

[0002] A positive displacement motor is a downhole power tool powered by mud. It consists of five parts: a bypass valve assembly, a motor assembly, a universal joint assembly, a drive shaft assembly, and an anti-drop assembly. The principle is that the mud output by the mud pump flows through the bypass valve and enters the motor. A certain pressure difference is formed at the inlet and outlet of the motor to push the rotor of the motor to rotate, and the torque and speed are transmitted to the drill bit through the universal joint and the drive shaft. The performance of the positive displacement motor mainly depends on the motor assembly.

[0003] The disadvantages of this tool are as follows: 1. The displacement range is limited, especially for small-sized positive displacement motors; 2. The normal bend of a conventional motor is 1-1.5°, and the build-up rate is relatively low; 3. The high-build positive displacement motor has a high build-up rate, but it cannot perform combined drilling and can only be used for directional drilling; 4. For wells with a high build-up rate, different-degree motors need to be continuously replaced, and tripping in and out is frequent, affecting the drilling efficiency and production cost. In view of this, a tool for trajectory control of ultra-short radius drilling with controllable trajectory is developed. Summary of the Utility Model

[0004] The utility model provides a tool for trajectory control of ultra-short radius drilling with controllable trajectory, which solves the problem that the discharge position of the valve port is limited when the bypass valve in the related technology is used.

[0005] The technical solution of the utility model is as follows: It includes

[0006] a drive shaft assembly, a universal joint assembly, a motor assembly, an anti-drop assembly, and a bypass valve assembly;

[0007] The drive shaft assembly, the universal joint assembly, the motor assembly, the anti-drop assembly, and the bypass valve assembly are sequentially inserted and assembled, and a blocking mechanism is arranged in the bypass valve assembly;

[0008] The blocking structure includes: a plug rod, a rod mother thread, and a plug head hexagon;

[0009] The plug rod is inserted into the interior of the bypass valve assembly, the rod mother thread is arranged at one end of the plug rod, and the plug head hexagon is arranged on one end face of the rod mother thread.

[0010] As a further technical solution, the plug rod is divided into a long plug rod and a short plug rod.

[0011] As a further technical solution, one end of the long plug rod passes through the bypass valve assembly and is inserted into the motor assembly.

[0012] As a further technical solution, the short plug rod is inserted into the bypass valve.

[0013] As a further technical solution, a valve port is provided on the side wall of the bypass valve assembly.

[0014] The working principle and beneficial effects of the present utility model are as follows:

[0015] In the present utility model, a double fixed bend or a front-end fixed bend plus a rear-end adjustable bend design is adopted, with a simple structure and a stable build-up rate. Both are matched with a high-torque output motor. Depending on the formation conditions, the rotation speed can be selected as low or high, and the displacement can be controlled by the selection of the plug. Different lengths of plugs can be arbitrarily switched, causing changes in the outlet during drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a cross-sectional view of the bypass valve assembly of the present utility model;

[0019] Figure 3 is a front view of the long plug rod of the present utility model;

[0020] Figure 4 is a front view of the short plug rod of the present utility model;

[0021] Figure 5 is a schematic cross-sectional view of the present utility model;

[0022] In the figure: 1, drive shaft assembly; 2, universal shaft assembly; 3, anti-drop assembly; 4, bypass valve assembly; 5, plug rod; 6, rod female thread; 7, plug hexagon; 8, valve port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0024] As Figures 1 to 5 shown, this embodiment proposes a tool for trajectory control of ultra-short radius drilling with controllable trajectory, including

[0025] a drive shaft assembly 1, a universal shaft assembly 2, a motor assembly, an anti-drop assembly 3, and a bypass valve assembly 4;

[0026] The transmission shaft assembly 1, the cardan shaft assembly 2, the motor assembly, the anti-drop assembly 3 and the bypass valve assembly 4 are plugged and assembled in sequence, and a blocking mechanism is provided in the bypass valve assembly 4;

[0027] The blocking structure comprises: a blocking rod 5, a rod female thread 6 and a hexagonal plug 7;

[0028] The blocking rod 5 is inserted into the bypass valve assembly 4 , the rod female thread 6 is arranged at one end of the blocking rod 5 , and the hexagonal plug 7 is arranged at one end surface of the rod female thread 6 .

[0029] Specifically, the blocking rod 5 is divided into a long blocking rod and a short blocking rod.

[0030] Furthermore, one end of the long blocking rod passes through the bypass valve assembly 4 and is inserted into the motor assembly.

[0031] Furthermore, the short blocking rod is inserted into the bypass valve, and a valve port 8 is provided on the side wall of the bypass valve assembly 4 .

[0032] In this embodiment, check whether the inside is clean from the joint on the screw rod, remove impurities, ensure that the end face of the rotor anti-drop assembly and the 7 hexagonal plugs are clean, use a 3 / 4" sleeve to cover the 7 hexagonal plugs, if necessary, use a wrench to extend the rod, turn the plug counterclockwise to unscrew the connecting thread between the plug and the anti-drop rod, wait for the connecting thread to be completely disengaged, and manually remove the plug. Because the lower end of the plug is equipped with an O-ring, a certain amount of force is required to pull out the plug, prepare the bypass plug (short plug), clean it, remove any burrs, apply lubricating oil on the plug and install the O-ring, clean the female thread 6 of the anti-drop rod, ensure that there is no thread glue remaining, and spray lubricating oil on the inner hole. Apply blue thread glue to the male buckle of the plug and manually feed the tail end of the plug into the anti-drop rod. When passing the inner hole of the anti-drop rod, gently push the thread to be connected to contact, turn the plug rightward until the end face matches, and after the bypass plug is installed in place, when the mud exceeds the predetermined displacement, the built-in bypass valve will automatically open to bypass the excess displacement.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for trajectory control of ultra-short radius drilling with controllable trajectory, characterized in that, including a drive shaft assembly (1), a universal shaft assembly (2), a motor assembly, a falling prevention assembly (3) and a bypass valve assembly (4); the drive shaft assembly (1), the universal shaft assembly (2), the motor assembly, the falling prevention assembly (3) and the bypass valve assembly (4) are inserted and assembled in sequence, and a blocking mechanism is arranged inside the bypass valve assembly (4); the blocking mechanism includes: a plug rod (5), a rod mother thread (6) and a plug head hexagon (7); the plug rod (5) is inserted into the inside of the bypass valve assembly (4), the rod mother thread (6) is arranged at one end of the plug rod (5), and the plug head hexagon (7) is arranged on one end face of the rod mother thread (6).

2. The tool for trajectory control of ultra-short radius drilling with controllable trajectory according to claim 1, characterized in that the plug rod (5) is divided into a long plug rod and a short plug rod.

3. A tool for trajectory control of ultra-short radius drilling with controllable trajectory according to claim 2, characterized in that, one end of the long plug rod passes through the bypass valve assembly (4) and is inserted into the motor assembly.

4. A tool for trajectory control of ultra-short radius drilling with controllable trajectory according to claim 2, characterized in that, the short plug rod is inserted into the bypass valve.

5. A tool for trajectory control of ultra-short radius drilling with controllable trajectory according to claim 1, characterized in that, a valve port (8) is arranged on the side wall of the bypass valve assembly (4).

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