油基钻井液是一种重要的钻井液，油基钻井液具有抗侵蚀、抗高温、润滑性好、有利于井壁稳定以及对储层污染程度小等特点。有机土是油基钻井液中一种亲油胶体，主要功用是增粘提切和降滤失。因此，对现有有机土应用于白油中进行了室内评价。结果表明，现有有机土大部分在白油中成胶率较低，成胶率在50%以下；少数有机土可以在白油中达到成胶率标准且有效提高基液的粘度，但滤失量较大。%Oil-based drilling fluid is akind ofimportant drillingfluid;ithas good characteristics, such as erosion resistance, high temperature resistance, lubricity, borehole wall stability and friendly to the reservoir.Organic clay is an important additive in oil base drilling fluid, whose main effect is to thicken and increase the yield point of the drilling fluid.In this paper, laboratory evaluationof the effect of organic clay in white oil-based drilling fluidwas carried out. The results show that most of the existing organic clay gelling rateisbelow 50% in white oil. A few of organic clay gelling ratecan reachtothestandardand effectively improve the viscosity of the white oil-base drilling fluids. But the filtrationlossis very large.
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