Hydraulically operated downhole motor

Details Hydraulically operated downhole motor Hydraulically operated downhole motor

1977-06-13

1978-07-04

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Below-ground storage of motivating energy

175 95, 175107, E21B 308

Patent

active

040983595

ABSTRACT:
A hydraulic motor for use in a drill string is disclosed. The motor incorporates a closed hydraulic system having a piston exposed to variations in mud flow pressure. The piston reciprocates and by its movement pumps hydraulic fluid in a closed hydraulic circuit. A motor is driven. The motor is supported on a hollow drive shaft. The drive shaft extends through the tool. It is hollow to permit mud flow to continue to the drill bit attached therebelow. The motor is attached to the exterior and rotates the shaft. The hydraulic fluid from the motor is returned to a reservoir and flows in a closed circuit from it. All of the equipment is in a closed elongate housing threading into the drill string.

REFERENCES:
patent: 3088529 (1963-05-01), Cullen et al.
patent: 3596722 (1971-08-01), Allard

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