Patent ID: 7645723

Claim:
A method of drilling in a subterranean formation comprising the steps of: providing an invert emulsion drilling fluid, the drilling fluid comprising: a continuous phase comprising at least one component selected from the group consisting of: paraffin hydrocarbons, esters, linear alpha olefins, mineral oil hydrocarbons, glyceride triesters, and naphthenic hydrocarbons, an internal phase comprising water, an emulsifier, a weighting agent, a modified fatty acid rheology modifier comprising dimeric and trimeric fatty acids, and a copolymer filtration control agent, wherein the drilling fluid suspends the weighting agent when stresses or forces associated with the drilling are reduced or removed from the drilling fluid; and produces substantially no pressure spike upon resumed stopped drilling, as detected by pressure-while-drilling equipment or instruments; and wherein the drilling fluid has substantially equal dial readings at 40° F. and at 120° F. when measured 3 rpm using a FANN viscometer at atmospheric pressure; and drilling in the subterranean formation with the drilling fluid.