Patent ID: 9085724
Filing Date: 2015-07-21
Classification: C09K,E21B,G05B

Abstract:
1. An oil-based fluid composition for use in downhole applications comprising: from about 30 vol.% to about 70 vol.% of an oil base fluid comprising blends of biodegradable, non-toxic, non-hazardous solvents including biodegradable isoparaffins, terpenes, or mixtures and combinations thereof having low viscosities, having a flashpoint of >80° C. (175° F.), is foamable, having a pour point of about 19° F. (−7.2° C.), and has an operating temperature range up to about 450° F., and an additive comprising at least a foaming agent and a gas in concentrations sufficient to produce a foamed downhole fluid having a foam height of at least 150 mL and a half life of at least 2 minutes, where the foaming agents are selected from the group consisting of fluoroaliphatic polymeric esters foaming agents, silicon foaming agents, or mixtures and combinations thereof, and where the oil-based fluid composition comprises a foamed oil-based drilling fluid, a foamed oil-based completion fluid, a foamed oil-based fracturing fluid, or a foamed oil-based stimulating fluid.