Abstract: Beta-glucan compositions and methods of making and using the same, such as for treatment of a subterranean formation. A beta-glucan composition includes a beta-glucan and water. Shearing the beta-glucan composition at a shear rate of up to a maximum shear rate of about 300,000 s?1 or less provides a sheared beta-glucan composition having a viscosity at standard temperature and pressure at 6 rpm of at least about 30 cps and a Filterability Ratio of less or equal to than about 1.5.

Abstract: Refined beta-glucans, such as scleroglucan or schizophyllan, and methods of making and using the same, such as for treating subterranean formations. A method of making a refined beta-glucan includes filtering a solution of a crude beta-glucan.

Abstract: Described herein is a beta glucan material, comprising 1,3-1,6 beta glucan, that when solubilized achieves a filterability ratio ranging from 1 to 2, preferably 1 to 1.5, and a viscosity ratio ranging from 1.5 to 4. The solubilized beta glucan materials has desired viscosity build and filterability property for EOR applications.

Abstract: Described herein is a beta glucan material, comprising solid 1,3-1,6 beta glucan, that when solubilized, under specified solubilization procedure, has a filterability ratio less than about 1.5. Further described herein is beta glucan material wherein greater than 50% of ultimate viscosity can be recovered after running specified solubilization procedure for one pass and greater than 70% after two passes. Also described herein is a beta glucan material that when solubilized, under specified solubilization procedure, has less than 10% viscosity loss during filtration.