Abstract: A treatment composition may contact an oil-based mud (OBM) filter cake formed over at least part of a wellbore for cleaning the filter cake by incorporating more oil and/or filter cake particles into the treatment composition as compared to an otherwise identical filter cake absent the treatment composition. The treatment composition may include, but is not limited to, a surfactant, an aqueous-based fluid, an agent, an optional second acid, and combinations thereof. The agent may be or include long chain alcohols, phenol derivatives, fatty esters, a first acid, and combinations thereof. The first acid may be or include a diacid. The diacid may be a polycarboxylic diacid, such as but not limited to [N-(1,2-dicarboxyethylene)D,L asparagine acid] (IDS), polyaspartic acid (DS), ethylenediamine-disuccinic acid (EDDS), [N,N-bis(carboxylmethyl)L-glutamic acid] (GLDA), methylglycinediacetic acid (MGDA), salts thereof, derivatives thereof, and combinations thereof.

Abstract: A treatment composition may contact an oil-based mud (OBM) filter cake formed over at least part of a wellbore for incorporating more oil and/or filter cake particles into the treatment composition as compared to an otherwise identical filter cake absent the treatment composition. The treatment composition may include, but is not limited to, a surfactant, an aqueous-based fluid, an agent, an optional second acid, and combinations thereof. The agent may be or include long chain alcohols, phenol derivatives, fatty esters, a first acid, and combinations thereof. The first acid may be or include citric acid, oleic acid, tartaric acid, stearic acid, linoleic acid, linolenic acid, aromatic dicarboxylic acids, oxalic acid, malonic acid, succinic acid, glutaric acid, boric acid, adipic acid, a diacid, a triacid, a tetraacid, and combinations thereof.

Abstract: A gravel packing fluid and method for gravel packing a wellbore using a gravel packing fluid comprising an invert emulsion comprising oil as an external phase, clear brine as an internal phase, and a quantity of emulsifier effective to produce a stable invert emulsion, the external phase of the gravel packing fluid further comprising gravel wetting agent.

Abstract: Invert emulsion drilling system fluids comprising an oleaginous continuous phase and a non-oleaginous dispersed phase, the dispersed phase comprising organofunctional compound(s) effective to provide shale inhibition. The organofunctional compound(s) may be used either as a supplement to or as a substitute for metallic salts.

Abstract: Invert emulsion drilling system fluids comprising an oleaginous continuous phase and a non-oleaginous dispersed phase, the dispersed phase comprising organofunctional compound(s) effective to provide shale inhibition. The organofunctional compound(s) may be used either as a supplement to or as a substitute for metallic salts.