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发明公开
CN105647493A 一种强抑制强封堵钻井液及其制备方法 有权

一种强抑制强封堵钻井液及其制备方法
摘要：
本发明公开一种钻井液，按重量份数计，含有3-5%膨润土，0.1-0.5%高粘度羧甲基纤维素钠，0.1-0.6%低粘度羧甲基纤维素钠，0.05-0.3%的降失水剂，0.3-2.0%褐煤树脂；0.1-3.0%KCl；0.05-0.5%Na2CO3;1.0-5.0%聚合醇；0.05-0.5%具包被作用的阳离子聚胺（简称为阳离子聚胺）；0.05-0.3%具降滤失及抑制作用的胺基化合物（简称为胺基化合物）；水为余量。该钻井液体系具有双重抑制作用，防塌性能好，能有效解决泥页岩水化分散膨胀及井壁坍塌等实际问题。
摘要（英）：

The invention discloses a drilling fluid, which comprises, by weight, 3-5% of bentonite, 0.1-0.5% of high viscosity sodium carboxymethyl cellulose, 0.1-0.6% of low viscosity sodium carboxymethyl cellulose, 0.05-0.3% of a fluid loss reducer, 0.3-2.0% of brown coal resin, 0.1-3.0% of KCl; 0.05-0.5% of Na2CO3, 1.0-5.0% of polymeric alcohol, 0.05-0.5% of cationic polyamine with coating effect (called cationic polyamine for short), 0.05-0.3% of an amino compound with filtrate loss reduction and inhibition effects (called amino compound for short), and the balance water. The drilling fluid system has dual inhibition effects, and good anti-collapse performance, can effectively solve clay shale hydrated dispersion expansion, borehole wall collapsing and other practical problems.

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