SURFACTANT SYSTEM AS A SELF-DIVERTED ACID FOR WELL STIMULATION

摘要

A composition for acid stimulation of a subterranean formation, which is an acidizing fluid including a sulfobetaine surfactant, a polymeric associative thickener, and a short chain alcohol. The acidizing fluid comprises sufficient acid so as to be non-viscous when pumped into a wellbore and becomes viscous as acid is consumed by reaction with formation components and pH of the fluid rises.

主权项

1. A fluid composition for acid stimulating a formation, the fluid comprising:
(a) an aqueous medium comprising an acid; (b) a primary surfactant comprising a sulfobetaine which forms non-elongate micelles; (c) an associative thickener comprising a polymer comprising at least one hydrophobic group and at least one hydrophilic group; and (d) a short chain alcohol.