Downhole traction system

Patent metadata

Field	Value
Publication number	US-12264544-B2
Application number	US-202318508923-A
Country	US
Kind code	B2
Filing date	Nov 14, 2023
Priority date	Apr 28, 2023
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A downhole traction system includes a driving system and a downhole wheeled tractor. The driving system is connected with the downhole wheeled tractor; the downhole wheeled tractor comprises a tractor body, a power unit and a plurality of traction units; the plurality of traction units are arranged along the extension direction of the tractor body; each of the traction units comprises a driving arm, a supporting arm, a supporting wheel, a driving assembly and a supporting assembly; the driving arm and the supporting arm are movably connected with the tractor body; and the supporting wheel is connected with the driving arm and the supporting arm. When the supporting assembly drives the supporting arm to extend along the radial direction of the tractor body under the hydraulic drive action of the hydraulic power unit, the supporting wheel can be abutted against the well wall.

First claim

We claim:

1. A downhole traction system, comprising a driving system and a downhole wheeled tractor, wherein the driving system is connected with the downhole wheeled tractor; the downhole wheeled tractor comprises a tractor body, a power unit and a plurality of traction units; the plurality of traction units are arranged along the extension direction of the tractor body; each of the traction units comprises a driving arm, a supporting arm, a supporting wheel, a driving assembly and a supporting assembly; the driving arm and the supporting arm are movably connected with the tractor body; and the supporting wheel is connected with the driving arm and the supporting arm;
wherein the power unit comprises an optical fiber nipple, a downhole measurement and control module, and a downhole control nipple; an optical transmitter and a pulse code modulation (PCM) electrical transceiver are installed in the optical fiber nipple; a downhole pressure sensor, a downhole speed sensor and a downhole displacement sensor are installed in the downhole measurement and control module; and the downhole control nipple is composed of a liquid storage tank, a control module and an exhaust port.

2. The downhole traction system according to claim 1 , wherein the power unit comprises a hydraulic power module, a wireless PLC module, and a downhole measurement and control module;
the hydraulic power module is connected with the driving assembly and the supporting assembly through the downhole measurement and control module, and the hydraulic power module is used for conveying pressurized hydraulic oil to the driving assembly and the supporting assembly through the downhole measurement and control module;
the wireless PLC module is electrically connected with the hydraulic power module and the downhole measurement and control module, and the wireless PLC module is used for communication connection with external equipment.

3. The downhole traction system according to claim 2 , wherein the driving assembly comprises a first hydraulic bidirectional motor and a mechanical transmission mechanism, the first hydraulic bidirectional motor is connected with the hydraulic power unit, and the mechanical transmission mechanism is in transmission connection with the first hydraulic bidirectional motor and the supporting wheel;
the first hydraulic bidirectional motor is used for driving the supporting wheel through the mechanical transmission mechanism to rotate under the hydraulic drive action of the hydraulic power unit.

4. The downhole traction system according to claim 2 , wherein the supporting assembly comprises a second hydraulic bidirectional motor and a supporting and regulating mechanism; the second hydraulic bidirectional motor is connected with the hydraulic power unit; and the supporting and regulating mechanism is in transmission connection with the second hydraulic bidirectional motor and the supporting arm;
the second hydraulic bidirectional motor is used for driving the supporting arm to extend or retract relative to the tractor body through the supporting and regulating mechanism under the hydraulic drive action of the hydraulic power unit.

5. The downhole traction system according to claim 2 , wherein the driving assembly is in transmission connection with the supporting wheel; the supporting assembly is in transmission connection with the supporting arm, and the driving assembly and the supporting assembly are connected with a hydraulic power unit;
the driving assembly is used for driving the supporting wheel to rotate under the hydraulic drive action of the hydraulic power unit; and the supporting assembly is used for driving the supporting arm to radially extend along the tractor body under the hydraulic drive action of the hydraulic power unit, so that the supporting wheel connected with the supporting arm is abutted against a well wall, or for driving the supporting arm to radially retract along the tractor body, so that the supporting wheel connected with the supporting arm is stored in the tractor body and not abutted against the well wall.

6. The downhole traction system according to claim 5 , wherein the hydraulic power module comprises a hydraulic oil tank, an oil filter, a hydraulic motor and a hydraulic pump; the hydraulic pump is communicated with the hydraulic oil tank through the oil filter, and the hydraulic motor is in transmission connection with the hydraulic pump and is used for driving the hydraulic pump to operate to pressurize the hydraulic oil in the hydraulic oil tank and pump into the downhole measurement and control module.

7. The downhole traction system according to claim 6 , wherein the downhole measurement and control module comprises a first hydraulic pipeline, a second hydraulic pipeline, a first electromagnetic multi-way reversing valve, a second electromagnetic multi-way reversing valve, a first check valve and a second check valve;
one end of the first hydraulic pipeline is communicated with the hydraulic pump, and the other end of the first hydraulic pipeline is communicated with P port of the first electromagnetic multi-way reversing valve; T port of the first electromagnetic multi-way reversing valve is communicated with the hydraulic oil tank; and A port and B port of the first electromagnetic multi-way reversing valve are communicated with the driving assembly;
one end of the second hydraulic pipeline is communicated with the hydraulic pump, and the other end of the second hydraulic pipeline is communicated with P port of the second electromagnetic multi-way reversing valve; T port of the second electromagnetic multi-way reversing valve is communicated with the hydraulic oil tank; and A port and B port of the second electromagnetic multi-way reversing valve are communicated with the supporting assembly;
the first check valve is arranged on the first hydraulic pipeline to conduct the first hydraulic pipeline in one direction from the hydraulic pump to the first electromagnetic multi-way reversing valve, and the second check valve is arranged on the second hydraulic pipeline to conduct the second hydraulic pipeline in one direction from the hydraulic pump to the second electromagnetic multi-way reversing valve;
the first electromagnetic multi-way reversing valve and the second electromagnetic multi-way reversing valve are Y-type three-position four-way electromagnetic reversing valves, and the A port and the B port of the first electromagnetic multi-way reversing valve and the second electromagnetic multi-way reversing valve are communicated with the T ports after power failure;
the downhole measurement and control module further comprises a pressure sensor and a flow sensor; the pressure sensor is used for detecting the oil pressure of hydraulic oil outputted by the hydraulic pump, and the flow sensor is used for detecting the flow of hydraulic oil outputted by the hydraulic pump.

8. The downhole traction system according to claim 5 , wherein the driving system comprises a ground driving system, a PLC control unit, a cable device and a ground measurement and control device; the ground measurement and control device is electrically connected with the ground PLC control unit; and the ground PLC control unit is electrically connected with the downhole wheeled tractor through the cable device.

9. The downhole traction system according to claim 1 , wherein the power unit comprises a control valve group, a downhole pressure sensor, a downhole speed sensor, a downhole displacement sensor and a mud continuous wave generator.

10. The downhole traction system according to claim 9 , wherein the driving system is a mud driving system.

11. The downhole traction system according to claim 10 , wherein

Assignees

• Univ Chengdu Technology

Inventors

• Zhao Jianguo
• Liu Qingyou
• Zhu Haiyan
• Wan Min
• Wang Guorong
• Dong Xuecheng
• Luo Xu
• Pei Yingju
• Wang Xingming

Classifications

• E21B23/14

  for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells · CPC title

• E21B47/13

  by electromagnetic energy, e.g. radio frequency · CPC title

• E21B47/06

  Measuring temperature or pressure · CPC title

• E21B47/09

  Locating or determining the position of objects in boreholes or wells {, e.g. the position of an extending arm}; Identifying the free or blocked portions of pipes · CPC title

• E21B23/001 Primary

  Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole · CPC title