COMPOSITION MATERIAL comprising the adduct or reaction product of at least one inorganic clay species with at least one crystalline, mixed layered metal hydroxide and process for the preparation of composite material

摘要

Novel compositions useful as fluid gelling agents, especially for use in subterranean applications such as drilling fluids, are prepared by reacting an aqueous dispersion of a clay, such as bentonite, with an aqueous gel of a monodispersed mixed metal layered hydroxide of the formula LimDdT(OH)(m+2d+3+na)Aan, where D is a divalent metal, such as Mg, T is a trivalent metal, such as Al, and A represents other monovalent or polyvalent anions, the formula being described in detail in the disclosure.