REMOVING FINES FROM A SPENT AQUEOUS WELL TREATING FLUID

摘要

Method of removing fines from a spent aqueous well treating fluid containing fines, a water-soluble polymer, a salting-out anion and/or a slightly soluble calcium or magnesium compound comprising the steps of: (a) raising the pH of the aqueous well treating fluid to allow agglomeration of the fines and precipitation of the water-soluble polymer; and (b) separating the agglomerates from the aqueous well treating fluid.