Cement spacer fluid comprising quaternary surfactant, viscosifier, and proppant

A method of cementing a wellbore penetrating a subterranean formation, the method comprising:

• injecting into the wellbore a cement spacer fluid comprising a carrier fluid, a quaternary surfactant, a viscosifier, and a proppant;
• injecting a cement slurry into the wellbore;
• and
• allowing the cement slurry to set,
• wherein the carrier fluid comprises water;
• the proppant comprises ceramic particles, sand, a nut shell, gravel, glass, or a combination comprising at least one of the foregoing;
• the quaternary surfactant has a cation of R1 R2 R3 R4N+ and an anion, wherein R1, R2, R3 and R4 are each independently a straight or branched C1-30 alkyl group, a C7-30 alkylbenzyl group, a C7-30 arylalkyl group, a straight or branched C3-30 alkenyl group, a C1-30 hydroxyalkyl group, a C7-30 hydroxyalkylbenzyl group, or a polyoxyalkylene group;
• and the anion comprises a halide, a perchlorate, a thiocyanate, a cyanate, a carboxylate, an alkyl sulfate, an alkyl sulfonate, PF6−, AsF6−, SbF6−, NO2−, NO3−, SO4−, or BX4−, wherein X is a halide;
• the viscosifier comprises guar gums, guar derivatives, hydratable polysaccharides, xanthan gum, galactomannan gums, glucomannan gums, cellulose, cellulose derivatives, poly((meth)acrylic acid)s, poly((meth)acrylamides), copolymers of (meth)acrylic acid and (meth)acrylamide, C1-8 alkyl poly(meth)acrylates, clays, or a combination comprising at least one of the foregoing viscosifiers;
• and
• the cement spacer fluid comprises about 30 to about 100 wt % of the carrier fluid, about 0.05 to about 10 wt % of the quaternary surfactant, about 0.05 to about 10 wt % of the viscosifier, and about 1 to about 65 wt % of the proppant, each based on the weight of water in the cement spacer fluid.