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US09328280B2 Additives for oil-based drilling fluids 有权
油基钻井液添加剂

Additives for oil-based drilling fluids
Abstract:
An additive for a wellbore treatment fluid comprising a sulfonated asphalt compound comprising particles having a D90 particle size of less than about 215 μm. A wellbore treatment fluid comprising (i) an oleaginous component and (ii) a sulfonated asphalt wherein the sulfonated asphalt comprises particles having a D90 of less than about 215 μm.
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