US Patent 7851415 Adaptive cementitious composites for well completions

An adaptive cementitious composite composition, comprising: a coarse particulate material such as sand or proppant; a series of other particulate or fibrous materials; and a carrier fluid; the sand and other particulate materials being present as a series of coarse, medium and fine particle sizes in ratios selected to provide an optimized packing volume fraction; wherein the sand or proppant is coated with a resin and at least one of the other particulate or fibrous materials is a material that can be modified when placed at a downhole location.