Patent ID: 7417010

Claim:
A method of treating a subterranean formation, the method comprising: injecting down a well bore into the formation an emulsion (a) having an internal aqueous phase comprising a water-soluble oil or gas field chemical or an aqueous dispersion of a water-dispersible oil or gas field chemical and an external oil phase comprising a liquid hydrocarbon and an oil-soluble surfactant; injecting into the formation a demulsifier (b) comprising a solution of a surfactant having a cloud point temperature of above 40° C. dissolved in a solvent selected from the group consisting of monoethylene glycol, tetraethylene glycol, butylethylene glycol, butyldiethylene glycol, water, xylene and toluene; and generating an admixture of emulsion (a) and demulsifier (b) within the formation.