Patent ID: 8653011

Claim:
A method, comprising: forming a gellable organic-based fluid system comprising a viscoelastic surfactant; dissolving a low molecular weight nitrogen compound in the fluid system, wherein the nitrogen compound is selected from the group consisting of, thiourea, guanidine and mixtures thereof, wherein the nitrogen compound is present in the fluid system in an amount and a form effective to increase initial viscosity of the fluid system at 100/s and reduce break time of the fluid system, relative to the fluid system without the nitrogen compound; and gelling the fluid system, whereby the gelled fluid system has a greater viscosity at 100/s upon initial gel formation and is subject to breaking at a faster rate, relative to a similar fluid system sans the low molecular weight nitrogen compound; and breaking the gel, whereby the gel is broken at a faster rate than the similar fluid system without the nitrogen compound under similar conditions.