| Citation: | NI Xiaoxiao, SHI He, CHENG Rongchao, et al.A modified hectorite viscosifier and gelling agent for oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：133-138 doi: 10.12358/j.issn.1001-5620.2022.02.001
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A modified hectorite viscosifier and gelling agent, MLap-1, for oil based drilling fluids, has been developed through one-step sol-gel method using triethoxyoctylsilane and hectorite. Characterization of the product with IR spectroscopy, TGA, TEM and surface wettability has proved the success of the synthesis. Evaluation of MLap-1 showed that it can improve the emulsion efficiency and electric stability of 80∶20 (O/W) emulsion; at 0.3% concentration of MLap-1 the electric stability of the emulsion was at least 1,200 V, and the apparent viscosity and yield point of the emulsion were increased from 12 mPa·s and 0 Pa to 23 mPa·s and 10 Pa, respectively. A high density oil based drilling fluid treated with MLap-1, after aging at 200 ℃, had its yield point maintained at above 4 Pa, low-shear-rate yield point above 3 Pa, electric stability above 1,000 V, and filtration rate less than 5.0 mL. These data indicate that MLap-1 is able to maintain the oil based drilling fluid in good suspension stability, good emulsion stability and good filtration control. The development of MLap-1 can be used to technically support the deep and ultra-deep drilling with oil based drilling fluids.
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