E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/25
E21B 21/00 (2006.01) E21B 47/18 (2006.01)
Patent
CA 2023351
The present invention discloses a double guided slide valve apparatus for producing pressure pulses in drilling mud medium flowing through a drill string casing.
Feld Dagobert
Baker Hughes Incorporated
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
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