The method of stimulation by acidification using agent of formation of viscoelastic gel

摘要

The "method of stimulation by acidification using agent of formation of viscoelastic gel".The present invention relates to a method of acidification of an underground formation that involves the use of a composition containing a solution of a surfactant of viscoelastic and amidoamina oxideAn acidifying solution containing HF.The composition typically contains from about 0.1 to about 8% by weight of surfactant solution and about 92 to about 99.9% by weight of an acid solution containing HF.The composition is pumped into the subterranean formation. Since the acid reacts, the composition viscosifica and makes an agent of autodesvio created in situ.When the acid is subsequently spent, the viscosity of the fluid low finally returning to a state of low viscosity, allowing for easy cleaning.The process enables selective acidification areas less permeable formation and more uniform stimulation of formation hydrocarbon carrier.