DOWNHOLE HYDRAULIC TRACTOR Russian patent published in 2018 - IPC E21B23/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used to deliver geophysical instruments and other equipment to directional and horizontal wells. Tractor comprises a body, a tank that is connected to the first filter and connected to the suction line of the pump connected to the motor, as well as with the first filter, with the second filter and with the safety valve, the valve being equalized with the tank and with the first pressure transducer, and the second pressure transducer connected to the temperature sensor, which is connected to the pump head, the second filter being connected to a first distributor which is connected to the first valve and the second valve, which in turn is connected to the first, second, third and fourth hydraulic cylinders, wherein the first distributor is connected to a second distributor, which in turn is connected to a first control valve connected to the first, second, third and fourth logic valves, with the possibility of providing fluid supply to the first, second, third and fourth hydraulic motors, which in turn are connected to the fifth, sixth, seventh and eighth logical valves, and the second distributor is connected to the second control valve and to the tank.

EFFECT: technical result consists in increasing the reliability of the operation of a downhole hydraulic tractor.

1 cl, 1 dwg