A pneumatic drive system for downhole wheeled traction devices

Abstract

This invention relates to a pneumatic drive system for a downhole wheeled traction device, comprising a surface gas compressor, a gas booster pump, a gas regulating module, a gas recovery station, an optical fiber device, an optical fiber receiving module, a surface optical fiber monitoring module, a downhole valve group control module, and a downhole wheeled traction device. The surface gas compressor is connected to the gas booster pump, which in turn is connected to the gas regulating module. The gas regulating module delivers gas to the downhole wheeled traction device via delivery pipeline A. The downhole wheeled traction device uses optical fiber transmission. The optical fiber device extends into the downhole wheeled traction device via optical fiber and is connected to the optical fiber receiving module. The surface optical fiber monitoring module is signal-connected to the optical fiber receiving module and the gas regulating module. The advantages of this invention are as follows: using pneumatic transmission on the surface saves costs, reduces the failure rate, and allows for timely feedback and adjustment.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development equipment, and in particular to a downhole wheeled traction gas drive system. Background Technology

[0002] In recent years, the global demand for oil and natural gas has continued to increase, and horizontal well drilling technology has become one of the most powerful technical means to reduce costs, increase production capacity, and achieve increased recoverable reserves. However, during logging and workover operations, horizontal wells often face the challenge of lowering related instruments or tools to the bottom of the well. Due to the special nature of horizontal wells, traditional logging and workover technologies that rely on gravity and cable suspension cannot meet the requirement of sending instruments into the horizontal well section. Therefore, downhole traction devices have emerged. Downhole traction devices can be classified into wheeled traction devices, telescopic traction devices, and tracked traction devices according to their movement mode. Wheeled traction devices have a simple structure and high speed, so they are widely used in the oil industry. Research has found that the common drive methods for downhole wheeled traction device systems at home and abroad are electric motor drive, hydraulic drive, and electric motor and hydraulic hybrid drive, and the traction force provided by downhole wheeled traction devices is relatively small. Electric motor drive cannot provide large traction force; hydraulic drive has large energy loss and low transmission efficiency, and is not suitable for long-distance transmission; electric motor and hydraulic hybrid drive has a complex structure and high cost. Therefore, selecting a suitable drive method and improving the adaptability of downhole wheeled tractors are challenging problems that need to be solved. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a pneumatic drive system for a downhole wheeled traction device. This objective is achieved through the following technical solution:

[0004] The downhole wheeled traction device's gas-driven system consists of a surface gas compressor, a gas booster pump, a gas regulating module, a gas recovery station, an optical fiber device, an optical fiber receiving module, a surface optical fiber monitoring module, a downhole valve group control module, and a downhole wheeled traction device. The surface gas compressor is connected to the gas booster pump, which in turn is connected to the gas regulating module. The gas regulating module delivers gas to the downhole wheeled traction device via delivery pipeline A. The downhole wheeled traction device's gas-driven system uses optical fiber to transmit measurement and control signals. The optical fiber device extends into the downhole wheeled traction device and is connected to the optical fiber receiving module. The surface optical fiber monitoring module is connected to the optical fiber receiving module and the gas regulating module. The downhole wheeled traction device is equipped with an optical fiber sub, a downhole monitoring module, a downhole control sub, and a traction module.

[0005] The ground gas compressor provides a high-pressure gas source, which is then pressurized by a gas booster pump. The gas regulation module can adjust the pressure and flow parameters of the output gas.

[0006] The fiber optic short section is equipped with an optical transmitter and a PCM electrical terminal unit. The downhole monitoring module is equipped with a downhole pressure sensor, a downhole speed sensor, and a downhole displacement sensor. The three sensors act as signal sources, and the signals are transmitted through the PCM electrical terminal unit and the optical transmitter to the fiber optic receiving module via optical fiber. The ground fiber optic monitoring module monitors the pressure, speed, and displacement of the downhole wheeled traction device.

[0007] The downhole control sub consists of a liquid storage tank, a control module, and an exhaust port. The exhaust port is connected to the gas recovery station via pipeline B to recover gas. The traction module consists of a hydraulic bidirectional motor, a transmission mechanism, a drive arm, a drive wheel, a support arm, a support adjustment mechanism, and a hydraulic cylinder.

[0008] The control module consists of a pneumatic liquid booster pump, an overflow valve, a three-position four-way solenoid directional valve, a two-position three-way solenoid directional valve, and an adjustable one-way throttle valve. There are two adjustable one-way throttle valves (39). The adjustable one-way throttle valve B is connected in series with the two-position three-way solenoid directional valve, and the adjustable one-way throttle valve B and the two-position three-way solenoid directional valve are connected in parallel with the adjustable one-way throttle valve A. The above three valves, the overflow valve, and the three-position four-way solenoid directional valve are connected in parallel.

[0009] Gas enters the pneumatic-liquid booster pump through the air inlet, thereby driving the hydraulic oil in the reservoir into the pneumatic-liquid booster pump.

[0010] The downhole valve group control module is connected to the control module via signal and can control the working status of the valve group; a differential circuit is formed between the two-position three-way solenoid directional valve and the hydraulic cylinder; an adjustable one-way throttle valve is installed at the inlet and outlet of the hydraulic cylinder, which plays the role of venting and throttling, and can also adjust the extension and retraction speed of the hydraulic cylinder to achieve better regulation.

[0011] The present invention has the following advantages:

[0012] (I) The surface part of the pneumatic drive system of the downhole wheeled traction device uses a surface compressor and a surface gas booster pump. After adjustment by the gas regulation module, the gas is delivered to the downhole wheeled traction device. Then, the pneumatic-liquid booster pump of the downhole wheeled traction device converts the pneumatic transmission into hydraulic transmission. The input gas is recovered to the gas recovery station through the exhaust port. The use of pneumatic transmission on the surface reduces costs and has a rapid response, with excellent adaptability to the working environment.

[0013] (ii) The downhole wheeled traction device in the pneumatic drive system pressurizes the system through a surface gas booster pump and a pneumatic liquid booster pump, thereby increasing the traction force of the downhole wheeled traction device.

[0014] (iii) The downhole wheeled traction device in the pneumatic drive system can avoid the situation where the support wheel cannot be retracted when the power is cut off or the control is lost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 The downhole wheeled traction device of the present invention

[0017] Figure 3 The overall control system of the present invention

[0018] In the diagram: 1-Surface gas compressor, 2-Surface gas booster pump, 3-Gas regulating module, 4-Transportation pipeline A, 5-Transportation pipeline B, 6-Gas recovery station, 7-Fiber optic cable, 8-Fiber optic device, 9-Fiber optic receiver module, 10-Surface fiber optic monitoring module, 11-Downhole valve group control module, 12-Downhole wheeled tractor, 13-Fiber optic connector, 14-Fiber optic stub, 15-Optical transmitter, 16-PCM electrical terminal, 17-Downhole monitoring module, 18-Downhole pressure sensor, 19-Downhole velocity sensor, 20-Downhole displacement sensor, 21- - Downhole control sub, 22-Reservoir tank, 23-Control module, 24-Exhaust port, 25-Traction module, 26-Hydraulic bidirectional motor, 27-Transmission mechanism, 28-Drive arm, 29-Drive wheel, 30-Support arm, 31-Support adjustment mechanism, 32-Hydraulic cylinder, 33-Pressure balance module, 34-Instrument connector, 35-Pneumatic-hydraulic booster pump, 36-Relief valve, 37-Three-position four-way solenoid directional valve, 38-Two-position three-way solenoid directional valve, 39-Adjustable one-way throttle valve, 39a-Adjustable one-way throttle valve A, 39b-Adjustable one-way throttle valve B Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following description:

[0020] Depend on Figure 1-3It can be seen that the downhole wheeled traction device pneumatic drive system consists of a surface gas compressor (1), a gas booster pump (2), a gas regulating module (3), a gas recovery station (6), an optical fiber device (8), an optical fiber receiving module (9), a surface optical fiber monitoring module (10), a downhole valve group control module (11), and a downhole wheeled traction device (12); the downhole wheeled traction device (12) consists of an optical fiber connector (13), an optical fiber short section (14), a downhole monitoring module (17), a downhole control short section (21), a traction module (25), a pressure balance module (33), and an instrument connector (34); the optical fiber short section (14) is equipped with an optical transmitter (15) and a PCM electrical terminal (16), and the downhole monitoring module (17) is equipped with a downhole pressure sensor (18), a downhole speed sensor (19), and a downhole displacement sensor (20); the downhole control short section (21) consists of an optical fiber connector (13), an optical fiber short section (14), a downhole electrical terminal (16), and a downhole pressure sensor (18), a downhole speed sensor (19), and a downhole displacement sensor (20); the downhole control short section (21) is equipped with an optical fiber connector (13), an optical fiber short section (14), a PCM electrical terminal (16), and a downhole pressure sensor (18), a downhole speed sensor (19), and a downhole displacement sensor (20); the downhole control short section (21) is equipped with an optical fiber connector (13), an optical fiber short section (14), an optical fiber short section (15), a PCM electrical terminal (16), and a PCM electrical terminal (16). The system consists of a liquid storage tank (22), a control module (23), and an exhaust port (24). The control module (23) consists of a pneumatic liquid booster pump (35), an overflow valve (36), a three-position four-way solenoid directional valve (37), a two-position three-way solenoid directional valve (38), and an adjustable one-way throttle valve (39). There are two adjustable one-way throttle valves (39). The adjustable one-way throttle valve B (39b) is connected in series with the two-position three-way solenoid directional valve (38). The adjustable one-way throttle valve B (39b) and the two-position three-way solenoid directional valve (38) are connected in parallel with the adjustable one-way throttle valve A (39a). The above three valves, the overflow valve (36), and the three-position four-way solenoid directional valve (37) are connected in parallel. The traction module (25) consists of a hydraulic bidirectional motor (26), a transmission mechanism (27), a drive arm (28), a drive wheel (29), a support arm (30), a support adjustment mechanism (31), and a hydraulic cylinder (32).

[0021] The surface gas compressor (1) is connected to the gas booster pump (2), and the gas booster pump (2) is connected to the gas regulating module (3). The gas regulating module (3) delivers gas to the downhole wheeled traction device (12) through the delivery pipeline A (4). The surface gas compressor (1) provides gas, which is boosted by the gas booster pump (2). The gas can be adjusted by the gas regulating module (3) to adjust parameters such as the output gas pressure. The downhole wheeled traction device's air drive system uses optical fiber transmission. The optical fiber device (8) extends into the downhole wheeled traction device (12) through the optical fiber (7). The optical fiber device (8) is connected to the optical fiber receiving module (9). The surface optical fiber monitoring module (10) is connected to the optical fiber receiving module (9) and the gas regulating module (3) via signals. The three sensors act as signal sources and transmit signals through the PCM terminal (16) and the optical transmitter (15) to the optical fiber receiving module (9). The surface optical fiber monitoring module (10) monitors the data of the downhole wheeled traction device (12). The gas output by the surface gas compressor (1) is pneumatically transmitted through the gas booster pump (2). The air inlet of the liquid booster pump (35) enters the pneumatic liquid booster pump (35), thereby driving the hydraulic oil in the storage tank (22) into the pneumatic liquid booster pump (35). The gas from the exhaust port of the pneumatic liquid booster pump (35) passes through the delivery pipeline B (5) and through the exhaust port (24) of the downhole wheel traction device into the gas recovery station (6) to complete the gas recovery; the downhole valve group control module (11) is connected to the control module (23) by signal and can control the working status of the valve group therein; the two-position three-way solenoid directional valve (3 8) A differential circuit is formed between the hydraulic cylinder (32). When the two-position three-way solenoid valve (38) is not energized, the left chamber of the hydraulic cylinder (32) is filled with hydraulic oil. When the solenoid valve on the left side of the two-position three-way solenoid valve (38) is energized, the hydraulic cylinder (32) extends. When the two-position three-way solenoid valve (38) is de-energized, the hydraulic cylinder (32) retracts. The adjustable one-way throttle valve (39) is installed at the inlet and outlet of the hydraulic cylinder (32) to play the role of exhaust throttling. At the same time, it can adjust the extension and retraction speed of the hydraulic cylinder (32) to achieve better adjustment.

[0022] The downhole wheeled traction device pneumatic drive system is used to place the downhole wheeled traction device (12) into the well. When the lower end of the downhole wheeled traction device (12) enters the horizontal well, the surface gas compressor (1) is started. The gas is pressurized by the surface gas booster pump (2) and then adjusted by the gas regulating module (3). The output gas is transported to the downhole wheeled traction device (12) through the delivery pipeline A (4). The pneumatic liquid booster pump (35) converts the pneumatic drive into the hydraulic transmission inside the downhole wheeled traction device (12). The gas in the downhole wheeled traction device (12) is recovered to the gas recovery station (6) through the exhaust port (24) in the downhole wheeled traction device (12) via the delivery pipeline B (5), so that the gas can be recycled. The downhole valve group control module (11) controls the electromagnet of the two-position three-way solenoid directional valve (38) to be energized, and the two-position three-way solenoid directional valve (38) starts to work. The piston of the hydraulic cylinder (32) extends and pushes the support adjustment mechanism (31) to make linear motion, which drives the support arm (30) to unfold. The drive wheel (29) is in close contact with the inner wall of the horizontal well casing and moves forward under the action of hydraulic transmission. The hydraulic bidirectional motor (26) can change the rotation direction through the three-position four-way solenoid directional valve (37). The hydraulic bidirectional motor (26) can retract the downhole wheel traction device (12) by rotating in the opposite direction. During the movement of the downhole wheel traction device (12) in the horizontal well, the downhole pressure sensor (18), downhole speed sensor (19), and downhole displacement sensor (20) serve as signal sources. The signals are transmitted through the PCM terminal (16) and optical transmitter (15) to the optical fiber receiving module (9). The ground optical fiber monitoring module (10) monitors the data of the downhole wheel traction device (12).

Claims

1. A pneumatic drive system for a downhole wheeled traction device, comprising a surface gas compressor (1), a gas booster pump (2), a gas regulating module (3), a gas recovery station (6), an optical fiber device (8), an optical fiber receiving module (9), a surface optical fiber monitoring module (10), a downhole valve group control module (11), and a downhole wheeled traction device (12), characterized in that: The ground gas compressor (1) is connected to the gas booster pump (2), and the gas booster pump (2) is connected to the gas regulating module (3). The gas regulating module (3) delivers gas to the downhole wheeled traction device (12) through the delivery pipeline A (4). The downhole wheeled traction device's gas drive system uses optical fiber to transmit measurement and control signals. The optical fiber device (8) extends into the downhole wheeled traction device (12) through the optical fiber (7). The optical fiber device (8) is connected to the optical fiber receiving module (9). The ground optical fiber monitoring module (10) is connected to the optical fiber receiving module (9) and the gas regulating module (3). The downhole wheeled traction device (12) is equipped with an optical fiber short section (14), a downhole monitoring module (17), a downhole control short section (21), and a traction module (25). The ground gas compressor (1) provides a high-pressure gas source, and the gas is pressurized by the gas booster pump (2). The gas regulating module (3) can adjust the pressure and flow parameters of the output gas. The downhole control sub (21) consists of a liquid storage tank (22), a control module (23), and an exhaust port (24). The exhaust port (24) is connected to the gas recovery station (6) through a conveying pipeline B (5) to recover gas. The traction module (25) consists of a hydraulic bidirectional motor (26), a transmission mechanism (27), a drive arm (28), a drive wheel (29), a support arm (30), a support adjustment mechanism (31), and a hydraulic cylinder (32). The control module (23) consists of a pneumatic liquid booster pump (35), an overflow valve (36), a three-position four-way solenoid directional valve (37), a two-position three-way solenoid directional valve (38), and an adjustable one-way throttle valve (39). The downhole valve group control module (11) is connected to the control module (23) by signal and can control the working state of the valve group therein; a differential circuit is formed between the two-position three-way solenoid directional valve (38) and the hydraulic cylinder (32); an adjustable one-way throttle valve (39) is installed at the inlet and outlet of the hydraulic cylinder (32) to play the role of exhaust throttling and at the same time adjust the extension and retraction speed of the hydraulic cylinder (32).

2. The pneumatic drive system for a downhole wheeled traction device according to claim 1, characterized in that: The optical fiber short section (14) is equipped with an optical transmitter (15) and a PCM electrical terminal (16). The downhole monitoring module (17) is equipped with a downhole pressure sensor (18), a downhole speed sensor (19), and a downhole displacement sensor (20). The three sensors serve as signal sources and transmit the signals through the PCM electrical terminal (16) and the optical transmitter (15) to the optical fiber receiving module (9). The ground optical fiber monitoring module (10) monitors the pressure, speed, and displacement of the downhole wheeled traction device (12).

3. The pneumatic drive system for a downhole wheeled traction device according to claim 1, characterized in that: There are two adjustable one-way throttle valves (39), namely adjustable one-way throttle valve A (39a) and adjustable one-way throttle valve B (39b); adjustable one-way throttle valve B (39b) is connected in series with a two-position three-way solenoid directional valve (38), and adjustable one-way throttle valve B (39b) and two-position three-way solenoid directional valve (38) are connected in parallel with adjustable one-way throttle valve A (39a). The above three valves, relief valve (36), and three-position four-way solenoid directional valve (37) are connected in parallel; wherein, the above three valves are adjustable one-way throttle valve A (39a), adjustable one-way throttle valve B (39b) and two-position three-way solenoid directional valve (38).

4. The pneumatic drive system for a downhole wheeled traction device according to claim 3, characterized in that: Gas enters the pneumatic-liquid booster pump (35) through the air inlet, thereby driving the hydraulic oil in the reservoir (22) into the pneumatic-liquid booster pump (35).

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