Separator sub

Details Separator sub Separator sub

E - Fixed Constructions

21

B

255/25

E21B 21/08 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1204429

Abstract of the Disclosure 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.

437713

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