Apparatus for reducing hydro-static pressure at the drill bit

Details Apparatus for reducing hydro-static pressure at the drill bit Apparatus for reducing hydro-static pressure at the drill bit

1986-06-02

1988-05-17

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

With below-ground conveyer or impeller for removal of cuttings

175106, 175107, 175323, 175324, E21B 402, E21B 2100

Patent

active

047444266

ABSTRACT:
A downhole tool positioned intermediate the mud motor and the drill bit, for reducing the hydro-static head near or around the bit. What is provided is an upper body portion threadably attachable to the mud motor and having an internal shaft with a bore therethrough for allowing mud to flow down the shaft rotatable during the the operation of the tool. The upper body portion further includes a gear member on the outer wall of the shaft for rotatably engaging the pair of upper gear members which imparts rotation to a pair of lower gear members for further imparting rotation to a fan member located in the lower portion of the tool. The lower portion of the tool member is flared to substantially engage the inner wall of the bore, with the interior of the lower flared portion housing the multi-vane fan so that upon rotation of the fan, the mud below the fan member is sucked into the fan through ports in the bottom of the tool, and out of lateral ports in the wall of the lower section, this movement of mud is effectively being "pulled" off of the bit to decrease the weight of the column of mud at the bit for more effective cutting. A second embodiment would include in the gearing section of the tool a bell gear member for imparting increased rotation to the fan member for more effective lowering of the weight of the mud at the bit.

REFERENCES:
patent: 2794617 (1957-06-01), Yancey
patent: 3656565 (1972-04-01), Fox
patent: 4049066 (1977-09-01), Richey
patent: 4137975 (1979-02-01), Pennock

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