Injection well cleaning fluids and related methods

A composition comprising:

• 0.5 wt % to about 5 wt % of a surfactant blend comprising an alkoxy carbonate surfactant and an internal olefin sulfonate surfactant;
• salt water having a total dissolved solids (TDS) of about 15,000 mg/L to about 50,000 mg/L;
• an organic acid present at about 0.001 wt % to about 0.05 wt % of the cleaning fluid;
• and
• an acidizing fluid comprising water and an acid selected from the group consisting of hydrofluoric acid, hydrochloric acid, acetic acid, formic acid, phosphoric acid, and combinations thereof, where the acid is present in a sufficient amount to cause the acidizing fluid to have a pH of about 1.5 to about 5.5;
• wherein the composition has an interfacial tension at 60° C. with crude oil having a viscosity 2.5 cP at 60° C. and viscosity of 0.5 cP at 90° C. of about 0.1 mN/m or less.

A composition comprising:

• 0.5 wt % to about 5 wt % of a surfactant blend comprising an alkoxy carbonate surfactant and an internal olefin sulfonate surfactant;
• salt water having a total dissolved solids (TDS) of about 15,000 mg/L or greater;
• about 0.001 wt % to about 0.05 wt % of an organic acid selected from the group consisting of acetic acid, formic acid, glycolic acid, lactic acid, succinic acid, malic acid, oxalic acid, citric acid, benzoic acid, salicylic acid, butyric acid, ascorbic acid, and any combination thereof;
• and
• an acidizing fluid comprising water and an acid selected from the group consisting of hydrofluoric acid, hydrochloric acid, acetic acid, formic acid, phosphoric acid, and combinations thereof, where the acid is present in a sufficient amount to cause the acidizing fluid to have a pH of about 1.5 to about 5.5;
• wherein the composition has an interfacial tension at 60° C. with crude oil having a viscosity 2.5 cP at 60° C. and viscosity of 0.5 cP at 90° C. of about 0.1 mN/m or less.