Self diverting matrix acid
AssigneeSchlumberger Technology Corporation
InventorsMarieliz Garcia-Lopez De Victoria, Yenny Christanti, Golchehreh Salamat, Zhijun Xiao
Life of this patent
Estimating the term…
Abstract
A method is described for treating a subterranean formation with a low viscosity fluid system that contains a surfactant or mixture of surfactants that does not divert fluid flow in the formation, but that develops the ability to divert flow as the fluid flows through the formation. The fluid optionally contains a formation-dissolving agent. The fluid is used in matrix acidizing, acid fracturing, and diversion.
Claims25
A method of treating a subterranean formation penetrated by a wellbore comprising injecting into said formation a treatment fluid comprising a viscoelastic surfactant system and an alcohol selected from methanol, ethanol, propanol, and mixtures thereof, at a viscoelastic surfactant concentration insufficient to divert fluid flow in the formation.
A method of treating a subterranean formation penetrated by a wellbore comprising injecting into said formation a treatment fluid comprising an anionic viscoelastic surfactant system at an anionic viscoelastic surfactant concentration insufficient to divert fluid flow in the formation.
A method of diverting a fluid injected into a subterranean formation penetrated by a wellbore comprising injecting into said formation a non-diverting treatment fluid comprising a surfactant system that does not form a viscoelastic fluid and allowing said fluid to become a diverting fluid as it flows through said formation.
A method of treating a subterranean formation penetrated by a wellbore comprising injecting into said formation a treatment fluid comprising a non-viscoelastic mixture of viscoelastic surfactants that aggregates into a viscosity-enhancing configuration as the fluid passes through the formation.
A method of treating a subterranean formation penetrated by a wellbore comprising injecting into said formation a treatment fluid comprising a non-viscoelastic mixture of one or more than one viscoelastic surfactant and one or more than one non-viscoelastic surfactant that aggregates into a viscosity-enhancing configuration as the fluid passes through the formation.
Dependencies are inferred from the claim text.