Abstract
Humic acid acetamide compounds with lipophilic property could dissolve or disperse in oil phase, so they were an important fluid loss additive for oil-based drilling fluids. Compared with water-soluble humic acid derivatives, the fluid loss-reducing mechanism of them was different. With analyzing the mechanism of increasing the flow resistance of liquid phase, bridging plugging, plugging pore and improving the quality of mudcake, the fluid loss-reducing mechanism of lipophilic humic acid acetamide compounds is investigated.
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