By-pass sub

Details By-pass sub By-pass sub

E - Fixed Constructions

21

B

E21B 7/00 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2280248

A bypass sub which will automatically bypass fluid flow in excess of a selected optimal flow rate for a downhole mud motor. A spring biased mandrel within a housing is driven downwardly by increased fluid flow, and driven upwardly by spring force upon decreased fluid flow, to control the alignment of a port in the mandrel with a bypass port in the housing, thereby maintaining a desired rate of fluid flow to the downhole motor.

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