Apparatus for reducing annular back pressure near the drill bit

Details Apparatus for reducing annular back pressure near the drill bit Apparatus for reducing annular back pressure near the drill bit

1976-04-19

1977-09-20

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175 67, 175107, 175324, 417336, E21B 1700

Patent

active

040490661

ABSTRACT:
An apparatus adapted to be connected in a drill string is disclosed. It utilizes an axially located turbine which is driven by the mud flow through the drill string. The turbine is supported by a shaft and connected to an appropriate gear train. The gear train rotates an outer sleeve which has multiple turns of an external screw thereon. The screw or helix extends toward the wall of the drill bore. The helix lifts the column of mud in the annular space above the drill bit away from the drill bit thereby reducing the back pressure just above the drill bit. This improves the jetting action of the mud pumped through the drill bit and provides for a more rapid excavation of the immediate vicinity, thereby increasing the rate of penetration of the drill bit.

REFERENCES:
patent: 1880214 (1932-10-01), Simmons
patent: 2635852 (1953-04-01), Snyder
patent: 2794617 (1957-06-01), Yancey
patent: 2849214 (1958-08-01), Hall
patent: 2976027 (1961-03-01), Alliman
patent: 3656565 (1972-04-01), Fox
patent: 3971450 (1976-07-01), Fox

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