Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1982-09-27
1984-10-09
Leppink, James A.
Boring or penetrating the earth
Processes
Boring with specific fluid
175339, 210788, E21B 2100
Patent
active
044756038
ABSTRACT:
Apparatus and methods are disclosed for drilling a well. A separator sub is used to separate a stream of drilling mud into a less dense first portion and more dense second portion. The less dense first portion of the stream of drilling mud is directed downward to a drill bit so that the drilling mud adjacent the drill bit has a density less than an initial density of the stream of drilling mud. The more dense second portion of the stream of drilling mud is ejected into a well annulus with an upward component of velocity and thereby reduces a hydrostatic drilling mud pressure adjacent the drill bit.
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Garvey Charles C.
Leppink James A.
Petroleum Instrumentation & Technological Services
Starinsky Michael
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