A cable-tube relay push-pull mechanism for a self-propelled, self-direction-changing directional drilling system

Abstract

A cable tube relay push-pull mechanism for a self-propelled, self-changing guiding drilling system comprises a cable tube and a plurality of walking support assemblies, wherein a walking support shell is fixedly connected to an outer wall of the cable tube, and an outer wall of the cable tube is fixedly connected to a motor stator, and a motor rotor is connected to a rotating guide rail and a guide rail fixing plate fixedly connected to a lower end of the rotating guide rail through a motor rotor key, and a plurality of groups of closed, circumferentially surrounding periodic wave guide grooves are extended on an outer wall of the rotating guide rail along its axial direction, and the head ends of a plurality of moving push rods are sleeved in the guide grooves of the rotating guide rail and can slide along the guide grooves, and the rear ends of the moving push rods are hinged to the head ends of sliding legs, and the sliding legs are slidably connected in a window of a walking support shell, and the rear ends of the sliding legs are hinged to adaptive support feet. When the self-feeding, self-changing guiding drilling system performs non-vertical directional drilling, the mechanism can support the cable tube in contact with the well wall in the drilling tool system, so that the cable tube is separated from the well wall, thereby greatly reducing the frictional resistance between the cable tube and the well wall and reducing energy consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling tools, and in particular relates to a cable-tube relay push-pull mechanism for a self-propelled, self-direction-changing and guiding drilling system. Background Art

[0002] A self-propelled, self-directing directional drilling system with patent number CN2020109883782 enables underground cable electric drilling tools to achieve autonomous pressurized walking, automatic direction change and guidance, in-situ monitoring near the drill bit, real-time data transmission and precise control of the drilling system. However, when the drilling system performs directional drilling, the cable pipe will contact the well wall and generate friction resistance. As the drilling depth increases and the open hole section grows, the contact resistance between the cable pipe and the well wall accumulates and increases. This not only easily damages the outer wall of the cable pipe, but also causes a large part of the energy originally used to drive the drill bit to break rock to be lost in overcoming the resistance between the cable pipe and the well wall, thereby increasing energy consumption and affecting drilling depth.

[0003] Since the self-propelled self-directed steerable drilling system is a special type of continuous tubing drilling system, according to research, the feeding of continuous tubing drilling systems at home and abroad mainly relies on the continuous tubing injection head. Foreign countries have developed continuous tubing equipment earlier, such as NOV Hydra Rig, Stewart & Stevenson and ASEP. The continuous tubing technology of these companies is relatively mature and advanced, but their continuous tubing injection principles are all based on the feeding of ground equipment. The injection and extraction of the continuous tubing are achieved by driving the chain above the wellhead center, which cannot solve the problem of friction between the continuous tubing and the well wall. In order to break the foreign technology monopoly on continuous tubing equipment, domestic companies mainly adopt a combination of technology introduction and independent research and development. For example, Jianghan Machinery Research Institute of CNPC Drilling Engineering Technology Research Institute and Sichuan Honghua Petroleum Equipment Co., Ltd. have developed continuous tubing equipment and achieved certain results, but their innovations are mainly based on simplifying the injection head structure and improving operating efficiency, which cannot fundamentally solve the problem of friction between the continuous tubing and the well wall.

[0004] In view of the above problems, in order to reduce the friction between the cable and the well wall, reduce energy consumption and improve the feeding effect when the self-propelled self-changing directional drilling system is performing non-vertical directional drilling, it is necessary to propose a cable relay push-pull mechanism for the self-propelled self-changing directional drilling system. Summary of the invention

[0005] The purpose of the present invention is to provide a cable tube relay push-pull mechanism for a self-propelled self-feeding guided drilling system, which aims to reduce the friction between the cable tube and the well wall during non-vertical directional drilling using the self-propelled self-feeding guided drilling system, and realize the function of synchronous feeding of the cable tube following the drilling tool system.

[0006] A cable tube relay push-pull mechanism for a self-propelled self-feeding guide drilling system, comprising a cable tube and a plurality of travel support components;

[0007] The walking support assembly includes a walking support housing motor stator, a motor rotor, a rotating guide rail, a guide rail fixing plate, a motion push rod, a sliding support leg, an adaptive support foot and a motor rotor key;

[0008] The walking support shell is fixedly connected to the outer wall of the cable tube, and an annular cavity is formed between the inner wall of the walking support shell and the outer wall of the cable tube. The outer wall of the cable tube is fixedly connected to the motor stator. The motor rotor is connected to the rotating guide rail and the guide rail fixing plate fixed to the lower end of the rotating guide rail through the motor rotor key. A plurality of groups of closed circumferentially surrounding periodic wave guide grooves extend along the axial direction of the outer side wall of the rotating guide rail. The head ends of a plurality of moving push rods are fitted in the guide grooves of the rotating guide rail and can slide along the guide grooves. The rear end of the moving push rod is hinged to the head end of the sliding leg. The sliding leg is slidably connected in the window of the walking support shell, and the rear end of the sliding leg is hinged to the adaptive support foot.

[0009] Beneficial effects of the present invention:

[0010] When the self-feeding self-direction steering drilling system performs non-vertical directional drilling, the mechanism can support the cable pipe in the drilling system that is in contact with the well wall, so that the cable pipe is separated from the well wall, thereby greatly reducing the friction between the cable pipe and the well wall, thereby reducing energy consumption. At the same time, the mechanism can also realize the synchronous feeding of the cable pipe and the drilling system, effectively reducing the load on the power output end of the drill bit and improving the feeding efficiency of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic perspective view of the present invention.

[0012] Figure 2 Longitudinal cross-sectional view of the present invention.

[0013] Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle.

[0014] Figure 4 Transverse cross-sectional view of the present invention.

[0015] Figure 5 It is a three-dimensional schematic diagram of the rotating guide rail.

[0016] Figure 6 A schematic diagram of the motion state within a motion cycle of the present invention. DETAILED DESCRIPTION

[0017] Please refer to Figures 1 to 6 , a cable tube relay push-pull mechanism of a self-propelled self-feeding guide drilling system, comprising a cable tube 1 and a plurality of walking support components;

[0018] The walking support assembly includes a walking support housing 3, a motor stator 4, a motor rotor 5, a rotating guide rail 6, a guide rail fixing plate 7, a motion push rod 8, a sliding support leg 9, an adaptive support foot 10 and a motor rotor key 11;

[0019] The walking support shell 3 is fixedly connected to the outer wall of the cable tube 1, and an annular cavity 13 is formed between the inner wall of the walking support shell 3 and the outer wall of the cable tube 1. The outer wall of the cable tube 1 is fixedly connected to the motor stator 4. The motor rotor 5 is connected to the rotating guide rail 6 and the guide rail fixing plate 7 fixedly connected to the lower end of the rotating guide rail 6 through the motor rotor key 11. A plurality of groups of closed circumferentially surrounding periodic wave guide grooves 14 extend along the axial direction of the outer side wall of the rotating guide rail 6. The head ends of a plurality of moving push rods 8 are fitted in the guide grooves 14 of the rotating guide rail 6 and can slide along the guide grooves 14. The end of the moving push rod 8 is hinged to the head end of the sliding leg 9. The sliding leg 9 is slidably connected in the window 12 of the walking support shell 3, and the end of the sliding leg 9 is hinged to the adaptive support foot 10.

[0020] Furthermore, the walking support shell 3 is a hollow tubular structure with an opening at the first end, and the fixed cover 2 is fixedly connected to the opening side of the first end of the walking support shell 3 .

[0021] Furthermore, a fixing rod is fixedly connected in the window 12 of the walking support shell 3, and the oblong hole provided on the sliding leg 9 is slidably connected to the fixing rod.

[0022] Furthermore, the rotating guide rail 6 is a hollow cylindrical structure.

[0023] Furthermore, the plurality of moving push rods 8 are distributed in a ring shape in the guide groove 14 of the rotating guide rail 6 .

[0024] Furthermore, the walking support assembly is installed on the cable tube 1 alternately forward and reversely.

[0025] Furthermore, the power circuit and control circuit of the motor are connected to the ground equipment through the internal channel of the cable tube 1.

[0026] The working process of the present invention is based on the following principles:

[0027] In actual work, according to the actual situation, a plurality of walking support assemblies can be evenly arranged at a certain interval on the cable tube 1 of the cable drilling system, and the walking support assemblies are alternately installed on the cable tube 1 in the positive and negative directions;

[0028] During drilling, the forward-mounted walking support assembly is in operation;

[0029] When the drill is lifted, the reverse-mounted walking support assembly is in operation;

[0030] This supports the cable tube 1 and lifts it away from the well wall, thereby greatly reducing the friction between the cable tube 1 and the well wall and reducing energy consumption. It can also produce a motion effect, allowing the cable tube to be fed synchronously with the drilling tool system. The following is the transformation process between various motion states within a motion cycle:

[0031] (1) Combination Figure 6 , from state 1 to state 2, during this process, the motor rotor 5 drives the rotating guide rail 6 to rotate α degrees, and then drives the moving push rod 8 to move. The moving push rod 8 pushes the sliding leg 9 to slide, so that it extends out of the window 12 on the walking support shell 3, and the adaptive support foot 10 connected to its end moves in contact with the well wall and fits tightly with the well wall during the contact process.

[0032] (2) Combination Figure 6 , from state 2 to state 3. In this process, the rotating guide rail 6 continues to rotate β degrees, and the moving push rod 8 pushes the sliding leg 9 to extend further, so that the adaptive support foot 10 always keeps close contact with the well wall. At the same time, the sliding leg 9 tilts, so that the sliding leg 9 and the well wall have a relative movement, and the reaction force of the well wall pushes the whole device forward to achieve the feeding of the cable pipe.

[0033] (3) Combination Figure 6 , from state 3 to state 1. In this process, the rotating guide rail 6 continues to rotate γ degrees, driving the moving push rod 8 to move toward the inside of the rotating guide rail 6, and then pulling the sliding leg 9 back into the walking support shell 3.

[0034] The above process is a motion cycle: state 1-state 2-state 3-state 1. The number of motion cycles experienced by the mechanism for each rotation of the rotating guide rail 6 is related to the shape of the guide groove 14 on the side wall of the rotating guide rail 6. Specifically, it should meet the requirement of (α+β+γ)*n=360°, where n is the number of motion cycles.

Claims

1. A cable-tube relay push-pull mechanism for a self-propelled, self-direction-changing directional drilling system, characterized in that: It comprises a cable tube (1) and a plurality of walking support components; The walking support assembly comprises a walking support housing (3), a motor stator (4), a motor rotor (5), a rotating guide rail (6), a guide rail fixing plate (7), a moving push rod (8), a sliding support leg (9), an adaptive support foot (10) and a motor rotor key (11); The walking support shell (3) is fixedly connected to the outer wall of the cable tube (1), an annular cavity (13) is formed between the inner wall of the walking support shell (3) and the outer wall of the cable tube (1), the outer wall of the cable tube (1) is fixedly connected to the motor stator (4), the motor rotor (5) is connected to the rotating guide rail (6) and the guide rail fixing plate (7) fixedly connected to the lower end of the rotating guide rail (6) through the motor rotor key (11), a plurality of groups of closed circumferentially surrounding periodic wave guide grooves (14) are extended along the axial direction of the outer wall of the rotating guide rail (6), the head ends of a plurality of moving push rods (8) are sleeved in the guide grooves (14) of the rotating guide rail (6) and can slide along the guide grooves (14), the rear ends of the moving push rods (8) are hinged to the front ends of the sliding legs (9), the sliding legs (9) are slidably connected in the window (12) of the walking support shell (3), and the rear ends of the sliding legs (9) are hinged to the adaptive support feet (10).

2. The cable-tube relay push-pull mechanism of the self-propelled and self-direction-changing steerable drilling system according to claim 1 is characterized in that: The walking support shell (3) is a hollow tubular structure with an opening at the head end, and the fixed cover (2) is fixedly connected to the opening side of the head end of the walking support shell (3).

3. The cable-tube relay push-pull mechanism of the self-propelled and self-direction-changing steerable drilling system according to claim 1 is characterized in that: A fixing rod is fixedly connected in the window (12) of the walking support shell (3), and the oblong hole arranged on the sliding leg (9) is slidably connected to the fixing rod.

4. The cable-tube relay push-pull mechanism of the self-propelled, self-direction-changing steerable drilling system according to claim 1, characterized in that: The rotating guide rail (6) is a hollow cylindrical structure.

5. The cable-tube relay push-pull mechanism of the self-propelled and self-direction-changing steerable drilling system according to claim 1 is characterized in that: The plurality of moving push rods (8) are distributed in a ring shape in the guide groove (14) of the rotating guide rail (6).

6. The cable-tube relay push-pull mechanism of the self-propelled and self-direction-changing steerable drilling system according to claim 1, characterized in that: The walking support assembly is installed on the cable tube (1) alternately in forward and reverse directions.

Images