Patent ID: 11905461
Assignee: CHEVRON U.S.A. INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
1. A method for stimulating an unconventional subterranean formation comprising:
(a) providing an existing wellbore in fluid communication with an unconventional subterranean formation, wherein the existing wellbore has a pressure that is less than original reservoir pressure;
(b) injecting a foamed composition through the existing wellbore into the unconventional subterranean formation, the foamed composition comprising a surfactant package comprising a primary foaming surfactant, wherein the foamed composition is injected at a pressure and flowrate effective to increase the existing wellbore pressure;
(c) contacting the foamed composition with a rock matrix of the unconventional subterranean formation for a period of time; and
(d) producing fluids from the unconventional subterranean formation through the wellbore;
wherein step (b) comprises:
combining a foam precursor solution with an expansion gas to form the foamed composition above ground, and injecting the foamed composition through the existing wellbore into the unconventional subterranean formation; or
combining a foam precursor solution with an expansion gas downhole to form the foamed composition in situ within the existing wellbore.