Viscosificante composition, process of ativacao of hydroxyethyl cellulose and process of increasing the viscosity of the aqueous solution

摘要

An effective viscosifying composition for brines, especially heavy brines having a density greater than 1.618 g/ml comprises from 10 to 25% by weight of hydroxyethyl cellulose in a polar organic liquid, e.g. an aliphatic glycol, triol or amide, which liquid when uniformly mixed with hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to polar organic liquid of 1:2, produces a mixture with substantially no free liquid present after remaining quiescent for one week at ambient temperature in a sealed container, said composition having been aged for a period of time sufficient to activate the hydroxyethyl cellulose.