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The use of organophilic clays as additives for providing proper rheological and filtration properties in non-aqueous drilling fluids (NADFs) has long been a topic of study. Currently, most of these clays are based on the modification of bentonite with quaternary ammonium salts. As new NADF systems emerging, novel clay-modification technologies are needed urgently to obtain more effective organophilic clays for specific drilling fluids. This paper introduced a modified rectorite designed for biodiesel-based drilling fluid (BBDF). Through a suspension production technique, rectorite, a clay mineral formed by dioctahedral mica layer and dioctahedral smectite layer with a 1:1 type of layer structure and a peculiar banded structure, was modified by non-ionic surfactants. The swell behavior of the modified rectorite in invert biodiesel emulsion was investigated. Effects of this novel organophilic clay on the electrical …