Process and universal downhole motor for driving a tool

Details Process and universal downhole motor for driving a tool Process and universal downhole motor for driving a tool

1976-03-29

1977-03-15

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

418 88, E21B 312

Patent

active

040119173

ABSTRACT:
The process enables, while starting from the same basical members, assembled in two different arrangements, to drive an earth-boring tool such as a bit, a milling cutter, a core barrel or the like with a reduced speed or a fast speed, according to the prevailing boring conditions. The downhole motor comprises a shaft and a body constituted by two helicoidal gears arranged within each other, providing an encapsulation preferably of right-handed pitch and having K and K+1 teeth. For providing a reduced speed the body is rotatably mounted and the tool is connected to said body. The shaft is angularly fixed and free to undergo a nutation movement. The resulting speed is the relative speed of rotation between the said body and the said shaft. For providing a fast rotation speed, the body is angularly and radially fixed. The helicoidal shaft meshes with the body and is supported in order freely to rotate around a crank system. The tool is connected to the crank.

REFERENCES:
patent: 2898087 (1959-08-01), Clark
patent: 3112801 (1963-12-01), Clark et al.
patent: 3443482 (1969-05-01), Lummus et al.
patent: 3489231 (1970-01-01), Garrison et al.
patent: 3603407 (1971-09-01), Cark
patent: 3838949 (1975-10-01), Makino
patent: 3840080 (1974-10-01), Berryman

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