Patent ID: 8640774
Filing Date: 2014-02-04
Classification: C09K,E21B

Abstract:
1. A method of treating a portion of a subterranean formation, comprising: providing a water-in-oil emulsion having an oil phase (O) and an aqueous phase (A) at an O/A ratio of from about 1:8 to about 10:1, wherein the water-in-oil emulsion includes the oil phase which is a continuous phase and comprises an inert hydrophobic liquid, the aqueous phase which is a dispersed phase of distinct particles in the oil phase and comprises water and a water soluble polymer, and surfactants, wherein the water soluble polymer comprises from 10 to 25 weight percent of the water-in-oil emulsion; inverting the water-in-oil emulsion by adding it to water to form a friction reducing treatment solution; and introducing the treatment solution into the portion of the subterranean formation; wherein the treatment solution provides at least comparable viscosity build to a treatment solution made from a water-in-oil emulsion of the same composition containing 15 wt % more water soluble polymer.