Organic acid treating fluids with viscoelastic surfactants and internal breakers

摘要: An aqueous fluid system that contains an dicarboxylic acid solution, a viscoelastic surfactant as gelling agent to increase the viscosity of fluid, and internal breaker such mineral oil and/or fish controllably break provides self-diverting treatment subterranean formations. The may be at least one oil, polyalphaolefin saturated fatty acid, is unsaturated acid. VES does not yield until organic starts spend. Full typically occurs about 6.0 pH. allows fully viscosify spent pH higher, but spent-acid gelled reaching reservoir temperature, controllable over time can achieved.