Separator sub with annular flow passage

Details Separator sub with annular flow passage Separator sub with annular flow passage

1982-09-27

1984-12-18

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175339, 175337, 210788, E21C 708

Patent

active

044886071

ABSTRACT:
Apparatus and methods are disclosed for drilling a well. A separator sub includes a cyclone separator which separates a stream of drilling mud into a less dense first portion and more dense second portion. The stream of drilling mud flows downward in an annular stream around the cyclone separator and then flows into a lower end of the cyclone separator. The less dense first portion of the stream of drilling mud is directed from the cyclone separator 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 directed upward from the cyclone separator and 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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