Methods for cementing wellbores utilizing spacer fluids that include surfactant packages

A method for cementing a wellbore, the method comprising:

• introducing a spacer fluid into the wellbore such that at least a portion of a drilling fluid positioned in the wellbore is displaced by the spacer fluid, the spacer fluid comprising:
• from 80 wt. % to 99 wt. % of an aqueous based fluid, based on the total weight of the spacer fluid;
• and
• from 1 wt. % to 20 wt. % of a surfactant package, based on the total weight of the spacer fluid, wherein the surfactant package comprises all surfactants in the spacer fluid, and wherein the surfactant package comprises at least 99 wt. %, based on the total weight of the surfactant package, of the combination of:
• from 10 wt. % to 40 wt. % of one or more alkyl ether carboxylates, based on the total weight of the surfactant package, wherein the one or more alkyl ether carboxylates consist of the formula R1-(OCH2CH2)nCOO−, wherein R1 is an alkyl group with 7 to 28 carbons, and wherein n is from 2 to 25;
• from 10 wt. % to 40 wt. % of one or more alcohol ethoxylates, based on the total weight of the surfactant package;
• and
• from 20 wt. % to 80 wt. % of one or more zwitterionic surfactants, based on the total weight of the surfactant package;
• and
• introducing a cement slurry into the wellbore such that at least a portion of the spacer fluid is displaced by the cement slurry.