SYNERGISTIC ORGANOPHILIC CLAY MIXTURE AS AN ADDITIVE TO OIL-BASED DRILLING FLUIDS
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United States of America Patent
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Jun 30, 2016
app pub date -
Mar 10, 2015
filing date -
Mar 10, 2015
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Abstract
An organophilic clay mixture having a first organophilic clay that is modified attapulgite clay and/or modified sepiolite clay, together with an organophilic modified bentonite clay, may be used as a rheological additive to improve the ultra-low shear rate viscosity of oil-based or synthetic oil-based drilling fluids (O/SBMs) and to increase the carrying capacity of the oil mud, while reducing the high shear rate readings. The clays are modified by treating them with quaternary amines and/or quaternary ammonium salts. The organophilic clay mixture significantly yields stable gels that are non-progressive compared to each individual organophilic clay used separately.
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