Patent ID: 7510009
Filing Date: 2009-03-31
Classification: C09K,Y10S

Abstract:
1. A method of stimulating a subterranean formation penetrated by a well with a diverting agent, the method comprising: (A) introducing into a high permeability zone of the formation a fluid comprising (i) an amidoamine oxide gelling agent and (ii) hydrochloric acid which, subsequent to introduction into the formation, forms a gelled diverting agent in-situ in the formation, wherein the strength of the hydrochloric acid is between from about 20 to about 28% and further wherein the amidoamine oxide gelling agent is of the formula: wherein R (B) increasing the viscosity of the fluid in the formation by spending the acid; and (C) subsequently introducing acid into the well, the flow of the subsequently introduced acid being diverted to a low permeability portion of the formation.