Method of acidizing a subterranean formation with diverting foam or fluid

A method for stimulating a formation penetrated by a well with a diverting agent of a gelled or thickened foam or fluid, the method comprising:

• (A.) introducing into the well an amidoamine oxide gelling agent and an acid, water and/or brine, optionally mixed with a, gas, wherein the amidoamine oxide gelling agent is of the formula:
• wherein R1 is a saturated or unsaturated, straight or branched chain aliphatic group of from about 7 to about 30 carbon atoms, R2 is a straight chain or branched, substituted or unsubstituted divalent alkylene group of from 2 to about 6 carbon atoms, R3 and R4 are independently selected from alkyl or hydroxyalkyl groups of from 1 to about 4 carbon atoms or R3 and R4 together with the nitrogen atom to which these groups are bonded form a heterocyclic ring of up to 6 members;
• and R5 is hydrogen or a C1-C4 alkyl or hydroxyalkyl group and further wherein the amidoamine oxide gelling agent and acid, water or brine and, optionally, gas forms a diverting agent of a gelled or thickened fluid or foam;
• and
• (B.) introducing an acid stage into the well either prior to or subsequent to the formation of the gelled or thickened fluid or foam,
• wherein the diverting agent diverts the flow of the acid stage from high permeability portions of the formation to low permeability portions of the formation and further wherein the amidoamine oxide gelling agent comprises amidoamine oxide neat or amidoamine oxide in a nonaqueous solvent.

A method of stimulating a subterranean formation penetrated by a well with a diverting agent, the process comprising:

• (A.) introducing into a high permeability zone of the formation a fluid comprising (i.) an amidoamine oxide gelling agent and (ii.) an acid, wherein the amidoamine oxide gelling agent is of the formula:
• wherein R1 is a saturated or unsaturated, straight or branched chain aliphatic group of from about 7 to about 30 carbon atoms, R2 is a straight chain or branched, substituted or unsubstituted divalent alkylene group of from 2 to about 6 carbon atoms, R3 and R4 are independently selected from alkyl or hydroxyalkyl groups of from 1 to about 4 carbon atoms or R3 and R4 together with the nitrogen atom to which these groups are bonded form a heterocyclic ring of up to 6 members;
• and R5 is hydrogen or a C1-C4 alkyl or hydroxyalkyl group;
• (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 wherein the amidoamine oxide gelling agent comprises amidoamine oxide neat or amidoamine oxide in a nonaqueous solvent.