Patent ID: 7527097

Claim:
A method of fracturing a subterranean formation, the subterranean formation being in fluid communication with the surface via a well, the method comprising: a) injecting a fracturing fluid into said well, wherein said fracturing fluid includes: an oleaginous fluid; and an amine surfactant having the structure wherein R is a C 12 -C 22 aliphatic hydrocarbon; R′ is an independently selectable from hydrogen or C 1 to C 3 alkyl; A is NH or O, and 1≦x+y≦3; and oil-wet proppant material; b) pressurizing said fluid so as to cause the subterranean formation to fracture and allow the proppant materials to enter said crack; c) adding acid to said fluid so as to change the oil-wet proppant materials into water-wet proppant materials and; d) washing said well with an aqueous based wash solution.