针对钻探工程带来的环境污染问题，以研发一套环保水基钻井液体系为目标出发，选择瓜儿豆胶（GHV-90）、预糊化淀粉（GK-K325）、改性蓖麻油（PCMAS5）作为处理剂，通过正交实验确定环保水基钻井液最佳配比：1%钠基膨润土(Na-B) + 0.6% GHV-90 + 1.5% GK-K325 + 1% PCMAS5，将该环保钻井液与特殊地层钻井液进行对比，开展线性膨胀试验、滚动回收试验、岩芯渗透压缩试验、抗污染实验和生物毒性测试，最后引入专家意见建立模糊评价模型。结果表明：定量化界定该环保水基钻井液综合性能属于良好级次。

In response to the environmental pollution caused by drilling engineering, to develop an environment-friendly water-based drilling fluid system. Guar gum (GHV-90), pregelatinized starch (GK-K325), and modified castor oil (PCMAS5) were selected as additives. Adopting orthogonal experimental design method, the optimal formulation of the drilling fluid was: 1% sodium based bentonite(Na-B) + 0.6% GHV-90 + 1.5% GK-K325 + 1% PCMAS5. A comparison was made between this environment-friendly drilling fluid and special formation drilling fluids, conducting linear expansion tests, rolling recovery tests, core permeability compression tests, anti-pollution experiments, and biotoxicity tests. Finally, expert opinions were introduced to establish a fuzzy evaluation model. The results show that the comprehensive performance of the environment-friendly water-based drilling fluid is quantitatively rated as good.