Tractor

Tractor serves as a dragging device when the logging tools go through the oil tube in the horizontal well.

Compostion:
Tractor is composed of two parts: surface system and down hole tools, including down hole tractor, surface control system and the software.
1.Surface System
The surface system consists of surface controller and portable PC. It can realize the following functions:
Power supply the down hole tools
Select different power supply modes for logging tool working or tractor working
Control the drive back-up mechanism and traction mechanism
Monitor the working state of back-up and traction devices
Adjust the traction speed by changing the voltage
Support the down electronic section and surface PC communication. The system consists of the following equipment:
2.Down Tools
Downhole tools consist of six detachable parts, including upper centralizer, measuring sub (CCL and tension), electronic circuit section, back-up section, traction section, lower centralizer.

Security of Tractor

As the underground environment is extremely complex in the horizontal wells, successful operation depends on the reliability and security of the tractor. The back-up section applies the electromagnetic clutch device, which ensures that the back-up arm automatic withdraws when the circuit fails. The weak point of the cut-off method can be adopted in the right position, so as to lead the tractor and down tools to the ground in case of getting stuck in the well.