Downhole wheeled tractor and system

Abstract

This invention relates to the field of oil and gas development equipment, specifically to a downhole wheeled traction device and system. The downhole wheeled traction device includes a traction device body, a hydraulic power unit, and multiple traction units. The multiple traction units are arranged along the extension direction of the body. Each traction unit includes a drive arm, a support arm, a support wheel, a drive assembly, and a support assembly. The drive arm and support arm are movably connected to the body, and the support wheel is connected to the drive arm and support arm. The drive assembly is drive-connected to the support wheel, and the support assembly is drive-connected to the support arm. Both the drive assembly and the support assembly are connected to the hydraulic power unit. During downhole use, the downhole wheeled traction device can provide driving force to multiple traction units through the hydraulic power unit, thereby improving its downhole traction capacity, enhancing its operational stability, and providing good adaptability to the downhole environment.

Description

Technical Field

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

[0002] In recent years, in order to reduce the cost of oil and gas extraction, horizontal drilling technology has been widely adopted for the exploitation of deep oil reserves.

[0003] Currently, horizontal wells are widely used for oil and gas resource development both domestically and internationally, and related technologies are becoming increasingly important. Horizontal wells often require the deployment of instruments and tools downhole for measurement and other operations during logging and other phases. The petroleum industry widely uses downhole traction devices (downhole towing systems) in horizontal wells for tool delivery, downhole monitoring, and construction operations.

[0004] Downhole traction devices can be divided into three main categories according to their movement: wheeled traction devices, telescopic traction devices, and tracked traction devices. Wheeled traction devices are widely used in the petroleum industry due to their simple structure and high speed; however, they have the disadvantage of low traction force. Summary of the Invention

[0005] This application provides a downhole wheeled traction device and system to improve the above-mentioned problems.

[0006] The present invention is as follows:

[0007] A downhole wheeled traction device includes a traction device body, a hydraulic power unit, and multiple traction units;

[0008] Multiple traction units are arranged along the extension direction of the main body. Each traction unit includes a drive arm, a support arm, a support wheel, a drive assembly, and a support assembly. The drive arm and the support arm are movably connected to the main body, and the support wheel is connected to the drive arm and the support arm.

[0009] The drive assembly is connected to the support wheel via a drive system, and the support assembly is connected to the support arm via a drive system. Both the drive assembly and the support assembly are connected to a hydraulic power unit.

[0010] The drive assembly is used to drive the support wheel to rotate under the hydraulic drive of the hydraulic power unit; the support assembly is used to drive the support arm to extend radially outward along the main body under the hydraulic drive of the hydraulic power unit so that the support wheel connected to the support arm abuts against the well wall, or to drive the support arm to retract radially inward along the main body so that the support wheel connected to the support arm is housed inside the main body and disengages from abutting against the well wall.

[0011] In one embodiment of the present invention, the drive assembly includes a first hydraulic bidirectional motor and a mechanical transmission mechanism. The first hydraulic bidirectional motor is connected to a hydraulic power unit, and the mechanical transmission mechanism is connected to the first hydraulic bidirectional motor and a support wheel.

[0012] The first hydraulic bidirectional motor is used to drive the support wheel to rotate through a mechanical transmission mechanism under the hydraulic drive of the hydraulic power unit.

[0013] In one embodiment of the present invention, the support assembly includes a second hydraulic bidirectional motor and a support adjustment mechanism. The second hydraulic bidirectional motor is connected to a hydraulic power unit, and the support adjustment mechanism is drivenly connected to the second hydraulic bidirectional motor and the support arm.

[0014] The second hydraulic bidirectional motor is used to drive the support arm to extend or retract relative to the main body through the support adjustment mechanism under the hydraulic drive of the hydraulic power unit.

[0015] In one embodiment of the present invention, the hydraulic power unit includes a hydraulic power module, a wireless PLC module, and a downhole monitoring and control module;

[0016] The hydraulic power module is connected to the drive assembly and support assembly via the downhole monitoring and control module. The hydraulic power module is used to deliver pressurized hydraulic oil to the drive assembly and support assembly via the downhole monitoring and control module.

[0017] The wireless PLC module is electrically connected to the hydraulic power module and the downhole measurement and control module, and the wireless PLC module is used for communication with external devices.

[0018] In one embodiment of the present invention, the hydraulic power module includes a hydraulic oil tank, an oil filter, a hydraulic motor, and a hydraulic pump;

[0019] The hydraulic pump is connected to the hydraulic oil tank through an oil filter. The hydraulic motor is connected to the hydraulic pump and is used to drive the hydraulic pump to pressurize the hydraulic oil in the hydraulic oil tank and pump it into the downhole monitoring and control module.

[0020] In one embodiment of the present invention, the downhole monitoring and control module includes a first hydraulic pipeline, a second hydraulic pipeline, a first electromagnetic multi-way directional valve, a second electromagnetic multi-way directional valve, a first check valve, and a second check valve.

[0021] One end of the first hydraulic line is connected to the hydraulic pump, and the other end of the first hydraulic line is connected to the P port of the first electromagnetic multi-way directional valve. The T port of the first electromagnetic multi-way directional valve is connected to the hydraulic oil tank, and the A and B ports of the first electromagnetic multi-way directional valve are both connected to the drive assembly.

[0022] One end of the second hydraulic line is connected to the hydraulic pump, and the other end of the second hydraulic line is connected to the P port of the second electromagnetic multi-way directional valve. The T port of the second electromagnetic multi-way directional valve is connected to the hydraulic oil tank, and the A and B ports of the second electromagnetic multi-way directional valve are both connected to the support assembly.

[0023] A first check valve is installed in the first hydraulic line to unidirectionally guide the flow of the first hydraulic line from the hydraulic pump to the first electromagnetic multi-way directional valve. A second check valve is installed in the second hydraulic line to unidirectionally guide the flow of the second hydraulic line from the hydraulic pump to the second electromagnetic multi-way directional valve.

[0024] In one embodiment of the present invention, both the first electromagnetic multi-way directional valve and the second electromagnetic multi-way directional valve are Y-type three-position four-way electromagnetic directional valves. After the first electromagnetic multi-way directional valve and the second electromagnetic multi-way directional valve are de-energized, their ports A and B are connected to port T.

[0025] In one embodiment of the present invention, the downhole monitoring and control module further includes a pressure sensor and a flow sensor. The pressure sensor is used to detect the oil pressure of the hydraulic oil output by the hydraulic pump, and the flow sensor is used to detect the flow rate of the hydraulic oil output by the hydraulic pump.

[0026] In one embodiment of the present invention, the downhole wheeled traction device includes multiple traction units, which are arranged along the extension direction of the main body and are all connected to a hydraulic power unit.

[0027] A downhole wheeled traction system includes a ground PLC control unit, a cable device, a ground measurement and control device, and the aforementioned downhole wheeled traction device;

[0028] The ground-based monitoring and control device is electrically connected to the ground-based PLC control unit, which in turn is electrically connected to the underground wheeled traction device via a cable system.

[0029] The beneficial effects of this invention are:

[0030] The downhole wheeled traction device includes a traction device body, a hydraulic power unit, and multiple traction units. The multiple traction units are arranged along the extension direction of the body. Each traction unit includes a drive arm, a support arm, a support wheel, a drive assembly, and a support assembly. The drive arm and support arm are movably connected to the body, and the support wheel is connected to the drive arm and support arm. The drive assembly is drive-connected to the support wheel, and the support assembly is drive-connected to the support arm. Both the drive assembly and the support assembly are connected to the hydraulic power unit. The drive assembly drives the support wheel to rotate under the hydraulic drive of the hydraulic power unit. The support assembly drives the support arm to extend radially outward along the body under the hydraulic drive of the hydraulic power unit, so that the support wheel connected to the support arm abuts against the well wall; or, drives the support arm to retract radially inward along the body, so that the support wheel connected to the support arm is housed within the body and disengaged from the well wall.

[0031] During its use in the well, this downhole wheeled traction device can provide driving force to multiple traction units through a hydraulic power unit to drive the traction units to move in the well. The traction unit includes a drive arm and a support arm that are movably connected to the main body. The drive component is driven by the support wheel, and the support component is driven by the support arm. Both the drive component and the support component are connected to the hydraulic power unit.

[0032] Therefore, under the hydraulic drive of the hydraulic power unit, the support arm and the drive arm can be driven to move relative to the main body. Thus, when the support assembly is driven by the hydraulic power unit, the support arm is driven to extend radially outward along the main body so that the support wheel abuts against the well wall. At the same time, under the hydraulic drive of the hydraulic power unit, the drive assembly can drive the support wheel to rotate, thereby enabling the downhole wheel traction device to move downhole.

[0033] During this process, the hydraulic power unit can drive the support arm and drive arm to move relative to the main body, thereby facilitating the adjustment of the support wheel's contact with the well wall and the rotation state of the support wheel. This not only improves the traction force of the downhole wheeled traction device in the well, but also enhances its operational stability and provides good adaptability to the downhole environment. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of the downhole wheeled traction device provided in this application;

[0036] Figure 2 A schematic diagram of the hydraulic power unit provided in this application;

[0037] Figure 3 This is a structural schematic diagram of the underground wheeled traction system provided in this application.

[0038] Icons: 100-Downhole wheeled traction device; 110-Traction device body; 120-Hydraulic power unit; 130-Traction unit; 131-Drive arm; 132-Support arm; 133-Support wheel; 134-Drive assembly; 135-Support assembly; 136-First hydraulic bidirectional motor; 137-Mechanical transmission mechanism; 138-Second hydraulic bidirectional motor; 139-Support adjustment mechanism; 121-Hydraulic power module; 122-Wireless PLC module; 123-Downhole monitoring and control module; 124- Hydraulic oil tank; 125-oil filter; 126-hydraulic motor; 127-hydraulic pump; 128-first hydraulic line; 129-second hydraulic line; 141-first solenoid multi-way directional valve; 142-second solenoid multi-way directional valve; 143-first check valve; 144-second check valve; 145-pressure sensor; 146-flow sensor; 147-relief valve; 200-downhole wheeled traction system; 210-surface PLC control unit; 220-cable assembly; 230-surface monitoring and control device. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Please refer to Figure 1 and Figure 2 This embodiment provides a downhole wheeled traction device 100, including a traction device body 110, a hydraulic power unit 120, and multiple traction units 130;

[0046] Multiple traction units 130 are arranged along the extension direction of the main body. Each traction unit 130 includes a drive arm 131, a support arm 132, a support wheel 133, a drive assembly 134, and a support assembly 135. The drive arm 131 and the support arm 132 are movably connected to the main body, and the support wheel 133 is connected to the drive arm 131 and the support arm 132.

[0047] The drive assembly 134 is connected to the support wheel 133, the support assembly 135 is connected to the support arm 132, and both the drive assembly 134 and the support assembly 135 are connected to the hydraulic power unit 120.

[0048] The drive assembly 134 is used to drive the support wheel 133 to rotate under the hydraulic drive of the hydraulic power unit 120; the support assembly 135 is used to drive the support arm 132 to extend radially outward along the main body under the hydraulic drive of the hydraulic power unit 120, so that the support wheel 133 connected to the support arm 132 abuts against the well wall, or to drive the support arm 132 to retract radially inward along the main body, so that the support wheel 133 connected to the support arm 132 is housed in the main body and disengages from the well wall.

[0049] Please refer to Figure 1 and Figure 2The working principle of the downhole wheeled traction device 100 is as follows:

[0050] When the downhole wheeled traction device 100 is used downhole, it can provide driving force to multiple traction units 130 through the hydraulic power unit 120 to drive the traction units 130 to move downhole; and since the traction unit 130 includes a drive arm 131 and a support arm 132 that are movably connected to the main body, and the drive assembly 134 is drivenly connected to the support wheel 133, and the support assembly 135 is drivenly connected to the support arm 132, and both the drive assembly 134 and the support assembly 135 are connected to the hydraulic power unit 120;

[0051] Therefore, under the hydraulic drive of the hydraulic power unit 120, the support arm 132 and the drive arm 131 can be driven to move relative to the main body. Thus, when the support assembly 135 is driven by the hydraulic power unit 120, the support arm 132 is driven to extend radially outward along the main body so that the support wheel 133 abuts against the well wall. At the same time, under the hydraulic drive of the hydraulic power unit 120, the drive assembly 134 can drive the support wheel 133 to rotate, thereby enabling the downhole wheel traction device 100 to move downhole.

[0052] During this process, the hydraulic power unit 120 can drive the support arm 132 and the drive arm 131 to move relative to the main body, thereby facilitating the adjustment of the bearing state of the support wheel 133 against the well wall and the rotation state of the support wheel 133. This not only improves the traction force of the downhole wheel traction device 100 in the well, but also enhances its operational stability and provides good adaptability to the downhole environment.

[0053] Further, please refer to Figure 1 and Figure 2 In this embodiment, in order for the support arm 132 and the drive arm 131 to move relative to the main body under the hydraulic drive of the hydraulic power unit 120, that is, to drive the support wheel 133 to rotate under the hydraulic drive of the hydraulic power unit 120, and at the same time, to adjust the abutment state between the support wheel 133 and the well wall by the movement of the support arm 132, the drive assembly 134 includes a first hydraulic bidirectional motor 136 and a mechanical transmission mechanism 137. The first hydraulic bidirectional motor 136 is connected to the hydraulic power unit 120, and the mechanical transmission mechanism 137 is connected to the first hydraulic bidirectional motor 136 and the support wheel 133. The first hydraulic bidirectional motor 136 is used to drive the support wheel 133 to rotate through the mechanical transmission mechanism 137 under the hydraulic drive of the hydraulic power unit 120.

[0054] The support assembly 135 includes a second hydraulic bidirectional motor 138 and a support adjustment mechanism 139. The second hydraulic bidirectional motor 138 is connected to the hydraulic power unit 120, and the support adjustment mechanism 139 is connected to the second hydraulic bidirectional motor 138 and the support arm 132. The second hydraulic bidirectional motor 138 is used to drive the support arm 132 to extend or retract relative to the main body through the support adjustment mechanism 139 under the hydraulic drive of the hydraulic power unit 120.

[0055] It should be noted that the above description is based on the structure of one traction unit 130. In this embodiment, the structural principles of multiple traction units 130 are the same, so the working principles and structures of other traction units 130 will not be described. In addition, during use, when the downhole wheeled traction device 100 needs to move downhole, the hydraulic power unit 120 first adjusts the position of the support arm 132 through the support adjustment mechanism 139 so that the support wheel 133 abuts against the well wall. When the support wheel 133 is abutting against the well wall, the hydraulic power unit 120 drives the support wheel 133 to rotate, which can perform traction. Moreover, since the power source of the support wheel 133 is hydraulic, the structural volume of the downhole wheeled traction device 100 can be effectively reduced and the traction force can be improved.

[0056] Based on the above, it should be noted that please refer to... Figure 1 and Figure 2 In this embodiment, multiple traction units 130 are all connected to the same hydraulic power unit 120, that is, the power source of multiple traction units 130 is the same hydraulic source. The purpose is to simplify the structural volume of the downhole wheeled traction device 100. When setting up the hydraulic power unit 120, in order to enable the hydraulic power unit 120 to stably provide hydraulic power to multiple traction units 130, the hydraulic power unit 120 may include a hydraulic power module 121, a wireless PLC module 122, and an downhole measurement and control module 123.

[0057] The hydraulic power module 121 is connected to the drive assembly 134 and the support assembly 135 via the downhole monitoring and control module 123. The hydraulic power module 121 is used to supply pressurized hydraulic oil to the drive assembly 134 and the support assembly 135 via the downhole monitoring and control module 123. The wireless PLC module 122 is electrically connected to the hydraulic power module 121 and the downhole monitoring and control module 123, and the wireless PLC module 122 is used to communicate with external devices.

[0058] Therefore, pressurized hydraulic oil can be delivered to the drive assembly 134 and the support assembly 135 through the hydraulic power module 121. Moreover, in order to control the delivered hydraulic oil based on the operating status of the downhole wheel traction device 100 in the well, a measurement and control module is provided. The measurement and control module can control the delivery status of the hydraulic oil and control the hydraulic oil delivered to the drive assembly 134 and the support assembly 135.

[0059] It should be noted that the wireless PLC module 122 is used to communicate with external devices. Its purpose is to receive control signals from the external control system and transmit the operating status information of the downhole wheeled traction device 100 in the well to the external control system.

[0060] When configuring the hydraulic power module 121, the hydraulic power module 121 includes a hydraulic oil tank 124, an oil filter 125, a hydraulic motor 126, and a hydraulic pump 127. The hydraulic pump 127 is connected to the hydraulic oil tank 124 through the oil filter 125. The hydraulic motor 126 is connected to the hydraulic pump 127 and is used to drive the hydraulic pump 127 to pressurize the hydraulic oil in the hydraulic oil tank 124 and pump it into the downhole monitoring and control module 123. It should be noted that the hydraulic power module 121 also includes an overflow valve 147 connected to the hydraulic oil tank 124.

[0061] Based on the above-described configuration of the hydraulic power module 121, please refer to... Figure 1 and Figure 2 The downhole monitoring and control module 123 may include a first hydraulic line 128, a second hydraulic line 129, a first electromagnetic multi-way directional valve 141, a second electromagnetic multi-way directional valve 142, a first check valve 143, and a second check valve 144.

[0062] One end of the first hydraulic line 128 is connected to the hydraulic pump 127, and the other end of the first hydraulic line 128 is connected to the P port of the first electromagnetic multi-way directional valve 141. The T port of the first electromagnetic multi-way directional valve 141 is connected to the hydraulic oil tank 124, and the A port and B port of the first electromagnetic multi-way directional valve 141 are both connected to the drive assembly 134.

[0063] One end of the second hydraulic line 129 is connected to the hydraulic pump 127, and the other end of the second hydraulic line 129 is connected to the P port of the second electromagnetic multi-way directional valve 142. The T port of the second electromagnetic multi-way directional valve 142 is connected to the hydraulic oil tank 124, and the A port and B port of the second electromagnetic multi-way directional valve 142 are both connected to the support assembly 135.

[0064] The first check valve 143 is disposed in the first hydraulic line 128 to unidirectionally guide the first hydraulic line 128 from the hydraulic pump 127 to the first electromagnetic multi-way directional valve 141. The second check valve 144 is disposed in the second hydraulic line 129 to unidirectionally guide the second hydraulic line 129 from the hydraulic pump 127 to the second electromagnetic multi-way directional valve 142.

[0065] Therefore, through the above structural arrangement, the hydraulic oil supply control of the drive assembly 134 and the support assembly 135 can be achieved by controlling the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142. In addition, since the support wheel 133 has both forward and reverse rotation during rotation, the direction of the hydraulic oil supplied to the drive assembly 134 can be adjusted by the first electromagnetic multi-way directional valve 141, so that the support wheel 133 can adjust its rotation direction according to traction requirements. Similarly, since the movement of the support arm 132 includes extension and retraction, the direction of the hydraulic oil supplied to the support assembly 135 can be adjusted by the second electromagnetic multi-way directional valve 142, so that the support arm 132 can adjust its position according to traction requirements, thereby allowing the support wheel 133 to abut or dismount from the well wall.

[0066] It should be noted that when the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142 are configured, since the T port of the first electromagnetic multi-way directional valve 141 is connected to the hydraulic oil tank 124, and the T port of the second electromagnetic multi-way directional valve 142 is also connected to the hydraulic oil tank 124, the return ports of both the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142 are connected to the hydraulic oil tank 124, thus forming a circulating oil circuit. In addition, when the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142 are configured, both the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142 are Y-type three-position four-way electromagnetic directional valves. The purpose of this configuration is that after the first electromagnetic multi-way directional valve 141 and the second electromagnetic multi-way directional valve 142 are de-energized, their A ports and B ports are both connected to the T port. The purpose of this configuration is to prevent the support wheel 133 from becoming stuck due to lack of rotation in the event of a power outage or loss of control, or to prevent the support arm 132 from being unable to retract.

[0067] Further, please refer to Figure 1 and Figure 2 In order to detect the delivery status of hydraulic oil, the downhole monitoring and control module 123 also includes a pressure sensor 145 and a flow sensor 146. The pressure sensor 145 is used to detect the oil pressure of the hydraulic oil output by the hydraulic pump 127, and the flow sensor 146 is used to detect the flow rate of the hydraulic oil output by the hydraulic pump 127.

[0068] Based on the above structural settings, please refer to Figure 1 and Figure 2 In this embodiment, the downhole wheeled tractor 100 includes five traction units 130, which are arranged along the extension direction of the main body, and all of the traction units 130 are connected to the hydraulic power unit 120.

[0069] Based on the above, please refer to Figures 1-3 The present invention also provides an underground wheeled traction system 200, including a ground PLC control unit 210, a cable device 220, a ground measurement and control device 230, and the aforementioned underground wheeled traction device 100;

[0070] The ground control device 230 is electrically connected to the ground PLC control unit 210, which is electrically connected to the downhole wheeled traction device 100 via a cable device 220. Furthermore, the ground PLC control unit 210 is communicatively connected to the wireless PLC module 122. Thus, the ground PLC control unit 210 can control the hydraulic power unit 120 and multiple traction units 130 of the downhole wheeled traction device 100 according to the usage requirements.

[0071] Please refer to Figures 1-3 The operating steps of the 200 downhole wheeled traction system are as follows:

[0072] The downhole wheel traction device 100, together with the cable released by the cable device 220, is slowly lowered into the well;

[0073] When the downhole wheeled tractor 100 is placed horizontally in a horizontal well or open hole, the cable is energized to activate the electronic components in the downhole wheeled tractor 100. At the same time, the ground PLC control unit 210 is activated and establishes a communication connection with the wireless PLC module 122, thereby enabling control of the working status of the downhole wheeled tractor 100.

[0074] Specifically, after the downhole wheeled tractor 100 enters the horizontal well or open hole completely horizontally,

[0075] The ground PLC control unit 210 is wirelessly connected to the wireless PLC module 122, which outputs a signal to energize the left electromagnet of the second electromagnetic multi-way reversing valve 142 of the downhole measurement and control and multiple traction units 130, so that it is in the left working position. At this time, the second hydraulic bidirectional motor 138 rotates to drive the support adjustment mechanism 139, so that the support arm 132 is extended radially along the main body, and the support wheel 133 connected to the support arm 132 is close to the well wall of the horizontal well or open hole well.

[0076] Subsequently, the left electromagnet controlling the first electromagnetic multi-way directional valve 141 is energized and placed in the left working position. At this time, the first hydraulic bidirectional motor 136 rotates in the forward direction and drives the support wheel 133 to rotate in the forward direction through the mechanical transmission mechanism 137, and the downhole wheel traction device 100 moves in the forward direction.

[0077] As the downhole wheeled tractor 100 advances in the horizontal well, the test data from the pressure sensor 145 and the flow sensor 146 are transmitted to the ground PLC control unit 210 via the wireless PLC module 122. The traction force and speed of the downhole wheeled tractor 100 can be measured through data conversion.

[0078] When the downhole wheeled tractor 100 is to be retrieved, the ground PLC control unit 210 transmits a control signal to the wireless PLC module 122, thereby controlling the right electromagnet of the first electromagnetic multi-way reversing valve 141 to be energized and placed in the right working position. At this time, the first hydraulic bidirectional motor 136 rotates in the reverse direction and drives the support wheel 133 to rotate in the reverse direction through the mechanical transmission mechanism 137. The downhole wheeled tractor 100 retracts in the reverse direction until the downhole wheeled tractor 100 retracts to the appropriate position.

[0079] After the downhole wheel traction device 100 retracts to the appropriate position, the right electromagnet controlling the second electromagnetic multi-way reversing valve 142 is energized and placed in the right working position. At this time, the second hydraulic bidirectional motor 138 rotates to drive the support adjustment mechanism 139, thereby causing the support arm 132 to retract radially inward along the main body, and causing the support wheel 133 connected to the support arm 132 to retract inward toward the main body and disengage from the well wall.

[0080] Then stop the hydraulic motor 126 and retrieve the downhole wheeled tractor 100.

[0081] In summary, the 200 downhole wheeled traction system has the following advantages:

[0082] The downhole wheeled tractor 100 uses multiple traction units 130 connected in series to achieve its crawling in the horizontal well. The multiple traction units 130 connected in series can provide greater traction force for the downhole wheeled tractor 100.

[0083] The downhole wheel traction device 100 uses a Y-type three-position four-way electromagnetic reversing valve to control its movement in the horizontal well. Therefore, the proper use of the first electromagnetic multi-way reversing valve 141 and the second electromagnetic multi-way reversing valve 142 can prevent the support wheel 133 from getting stuck in the well and the support wheel 133 from being unable to retract in the event of power failure or loss of control.

[0084] The ground PLC control unit 210 is used to control the downhole measurement and control and control the working status of the first electromagnetic multi-way reversing valve 141 and the second electromagnetic multi-way reversing valve 142, which can better control the movement of the downhole wheeled traction device 100 in the horizontal well.

[0085] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A downhole wheeled traction device, characterized in that: The downhole wheeled traction device includes a traction device body, a hydraulic power unit, and multiple traction units; Multiple traction units are arranged along the extension direction of the main body. Each traction unit includes a drive arm, a support arm, a support wheel, a drive assembly, and a support assembly. The drive arm and the support arm are movably connected to the main body, and the support wheel is connected to the drive arm and the support arm. The drive assembly is connected to the support wheel via a transmission, the support assembly is connected to the support arm via a transmission, and both the drive assembly and the support assembly are connected to the hydraulic power unit. The drive assembly is used to drive the support wheel to rotate under the hydraulic drive of the hydraulic power unit; The support assembly is used to drive the support arm to extend radially outward along the main body under the hydraulic drive of the hydraulic power unit, so that the support wheel connected to the support arm abuts against the well wall, or to drive the support arm to retract radially inward along the main body, so that the support wheel connected to the support arm is housed in the main body and disengages from abutting against the well wall. The drive assembly includes a first hydraulic bidirectional motor and a mechanical transmission mechanism. The first hydraulic bidirectional motor is connected to the hydraulic power unit, and the mechanical transmission mechanism is connected to the first hydraulic bidirectional motor and the support wheel. The first hydraulic bidirectional motor is used to drive the support wheel to rotate through the mechanical transmission mechanism under the hydraulic drive of the hydraulic power unit; The support assembly includes a second hydraulic bidirectional motor and a support adjustment mechanism. The second hydraulic bidirectional motor is connected to the hydraulic power unit, and the support adjustment mechanism is drivenly connected to the second hydraulic bidirectional motor and the support arm. The second hydraulic bidirectional motor is used to drive the support arm to extend or retract relative to the main body through the support adjustment mechanism under the hydraulic drive action of the hydraulic power unit. The hydraulic power unit includes a hydraulic power module, a wireless PLC module, and a downhole monitoring and control module; The hydraulic power module is connected to the drive assembly and the support assembly through the downhole monitoring and control module. The hydraulic power module is used to deliver pressurized hydraulic oil to the drive assembly and the support assembly via the downhole monitoring and control module. The wireless PLC module is electrically connected to the hydraulic power module and the downhole measurement and control module, and the wireless PLC module is used for communication with external devices; The hydraulic power module includes a hydraulic oil tank, an oil filter, a hydraulic motor, and a hydraulic pump; The hydraulic pump is connected to the hydraulic oil tank through the oil filter, and the hydraulic motor is connected to the hydraulic pump for driving the hydraulic pump to pressurize the hydraulic oil in the hydraulic oil tank and pump it into the downhole monitoring and control module. The downhole monitoring and control module includes a first hydraulic pipeline, a second hydraulic pipeline, a first electromagnetic multi-way directional valve, a second electromagnetic multi-way directional valve, a first check valve, and a second check valve. One end of the first hydraulic line is connected to the hydraulic pump, and the other end of the first hydraulic line is connected to the P port of the first electromagnetic multi-way directional valve. The T port of the first electromagnetic multi-way directional valve is connected to the hydraulic oil tank, and both the A port and the B port of the first electromagnetic multi-way directional valve are connected to the drive assembly. One end of the second hydraulic line is connected to the hydraulic pump, and the other end of the second hydraulic line is connected to the P port of the second electromagnetic multi-way directional valve. The T port of the second electromagnetic multi-way directional valve is connected to the hydraulic oil tank, and both the A port and the B port of the second electromagnetic multi-way directional valve are connected to the support assembly. The first check valve is disposed in the first hydraulic line to unidirectionally guide the flow of the first hydraulic line from the hydraulic pump to the first electromagnetic multi-way directional valve. The second check valve is disposed in the second hydraulic line to unidirectionally guide the flow of the second hydraulic line from the hydraulic pump to the second electromagnetic multi-way directional valve.

2. The downhole wheeled traction device according to claim 1, characterized in that: Both the first electromagnetic multi-way directional valve and the second electromagnetic multi-way directional valve are Y-type three-position four-way electromagnetic directional valves. After de-energization, both the first electromagnetic multi-way directional valve and the second electromagnetic multi-way directional valve have their ports A and B connected to port T.

3. The downhole wheeled traction device according to claim 1, characterized in that: The downhole monitoring and control module also includes a pressure sensor and a flow sensor. The pressure sensor is used to detect the oil pressure of the hydraulic oil output by the hydraulic pump, and the flow sensor is used to detect the flow rate of the hydraulic oil output by the hydraulic pump.

4. The downhole wheeled traction device according to any one of claims 1-3, characterized in that: The downhole wheeled traction device includes five traction units, all of which are connected to the hydraulic power unit.

5. A downhole wheeled traction system, characterized in that: The downhole wheeled traction system includes a ground PLC control unit, a cable device, a ground measurement and control device, and a downhole wheeled traction device as described in any one of claims 1-4; The ground monitoring and control device is electrically connected to the ground PLC control unit, and the ground PLC control unit is electrically connected to the downhole wheeled traction device through the cable device.

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