Method of drilling a borehole

Details Method of drilling a borehole Method of drilling a borehole

1986-08-28

1988-01-12

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175215, E21B 2112

Patent

active

047185031

ABSTRACT:
A method of drilling a borehole is provided using a drill bit coupled to the lower end of a pair of concentric drill pipes. During drilling a first low viscosity fluid, such as oil or water, is circulated through the pipes while a second fluid, such as a weighted viscosified mud, is kept stationary in the pipe/formation annulus.

REFERENCES:
patent: 1585969 (1926-05-01), Ferguson
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patent: 3416617 (1968-12-01), Elenburg
patent: 3416618 (1968-12-01), Kunnemann
patent: 3419092 (1968-12-01), Elenburg
patent: 3534822 (1970-10-01), Campbell
patent: 3596720 (1971-08-01), Elenburg
patent: 3664415 (1972-05-01), Carey
patent: 4171187 (1979-10-01), Reed

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