Patent ID: 6017854
Filing Date: 2000-01-25
Classification: C09K,Y10S

Abstract:
A method for drilling a borehole in a subterranean formation, the method comprising the steps of:(a) rotating a drill bit in the borehole; and(b) introducing a drilling fluid into the borehole (i) to pick up drill cuttings and (ii) to carry at least a portion of the drill cuttings out of the borehole,where the drilling fluid comprises:(A) one or more non-aqueous fluids and(B) one or more viscosifying/fluid loss agents selected from the group consisting of styrene-ethylene/butylene-styrene block copolymers, styrene-ethylene/propylene block copolymers, styrene-isoprene-styrene block copolymers, glyceryl-tris-12-hydroxystearate, and mixtures thereof.