Brine-tolerant compositions comprising fatty acid or fatty ester reaction products of saccharide polymers

A composition comprising:

• an aqueous fluid;
• a neutral surfactant or a reaction product form thereof;
• a reaction product of a saccharide polymer and a fatty acid or a fatty ester, the saccharide polymer comprising a dextran, a dextrin compound, or any combination thereof, and the reaction product of the saccharide polymer and the fatty acid or the fatty ester and the reaction product form of the neutral surfactant, if present, being formed in the presence of an aqueous hydroxide base;
• and
• one or more zwitterionic surfactants;
• wherein a volume ratio of the one or more zwitterionic surfactants with respect to a combined volume of the one or more zwitterionic surfactants and the reaction product of the saccharide polymer and the fatty acid or the fatty ester is sufficient to make the composition brine-tolerant;
• wherein the one or more zwitterionic surfactants comprise at least one amphoacetate, at least one amphodiacetate, or any combination thereof, and a volume ratio of the at least one amphoacetate, the at least one amphodiacetate, or any combination thereof with respect to the combined volume of the one or more zwitterionic surfactants and the reaction product of the saccharide polymer and the fatty acid or the fatty ester ranges from about 0.1 to about 0.3.

A composition comprising:

• an aqueous fluid;
• a neutral surfactant or a reaction product form thereof;
• a reaction product of a saccharide polymer and a fatty acid or a fatty ester, the saccharide polymer comprising a dextran, a dextrin compound, or any combination thereof, and the reaction product of the saccharide polymer and the fatty acid or the fatty ester and the reaction product form of the neutral surfactant, if present, being formed in the presence of an aqueous hydroxide base;
• and
• one or more zwitterionic surfactants;
• wherein a volume ratio of the one or more zwitterionic surfactants with respect to a combined volume of the one or more zwitterionic surfactants and the reaction product of the saccharide polymer and the fatty acid or the fatty ester is sufficient to make the composition brine-tolerant;
• wherein the composition is non-emulsifying toward oleaginous fluids, and the one or more zwitterionic surfactants comprise at least one amphoacetate, at least one amphodiacetate, or any combination thereof.