A method of fracturing a subterranean formation, the method including
injecting a fracturing fluid into the well, wherein said fracturing fluid
includes: an oleaginous fluid; and an amine surfactant having the
structure ##STR00001## wherein R is a C.sub.12-C.sub.22 aliphatic
hydrocarbon; R' is an independently selectable from hydrogen or C.sub.1
to C.sub.3 alkyl; A is NH or O, and 1.ltoreq.x+y.ltoreq.3; and oil-wet
proppant material. Additionally, the method includes pressurizing the
fluid so as to cause the subterranean formation to fracture and allow the
proppant materials to enter the crack, adding acid to the fluid so as to
change the oil-wet proppant materials into water-wet proppant materials,
and washing the well with an aqueous based wash solution.