Dow Corning Corporation

Charles W Olsen, Jr

Donald Taylor Liles

Diane Marie Kosal

Julie Cook

Vicki Lynn Berry

Susan Jane Gelderbloom

Christian Francis C Rome

A silicone MQ resin based composition provides the oil industry with Fluid Loss Control (FLC) additives for water based drilling muds which are non-damaging. The composition is capable of achieving zero fluid seepage through filter cake, and a short build time for the initial filter cake, while not reducing the return flow of oil from producing formations. The composition is stable in saturated salt at 120&#xb0; C. and elevated pressures. The composition comprises solid particles of silicone resin with a glass transition temperature more than 70&#xb0; C., and it contains solid particles of silicone resin with a particle size distribution in which ( ) at least 90 volume percent of solid particles of silicone resin have an average major axis diameter of 40 &#x3bc;m or less than 40 &#x3bc;m, and (ii) at least 10 volume percent of solid particles of silicone resin have an average major axis diameter of 2 &#x3bc;m or less.

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Midland, MI, United States of America

Charles W Olsen, Jr