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膨润土是常用的水基钻井液配浆材料,可以起到调节钻井液密度、携带岩屑、改善流体黏度等作用。我国的膨润土资源丰富,但是以低品级的钙基膨润土为主,很难直接应用于钻井液配浆,需要对其进行提纯、钠化及有机化改性,使其达到钻井液的使用要求。本文对目前钻井液用膨润土的改性方法进行了总结,并对高性能钻井液用膨润土的制备及其发展方向进行了展望。
Bentonite is commonly used water-based drilling fluid with pulp material, can play a role in regulating drilling fluid density, carry debris, improve fluid viscosity and so on. Bentonite is rich in resources in our country. However, it is difficult to apply bentonite to low-grade calcium bentonite directly. Therefore, it needs to be purified, sodium and organic modified to meet the requirement of drilling fluid. In this paper, the modification methods of bentonite for drilling fluid are summarized, and the preparation and development of bentonite for drilling fluid with high performance are prospected.