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针对华北油田南部地区地层粘土矿物以伊蒙混居为主共夹杂石膏的特点，优选了MMH钻井液体系。加入MMH正电胶的目的是提高钻井液的流变性、抑制性，为了控制滤失量还必需加入降滤失剂。加入降滤失剂后，影响到正电胶的正电性能。为了解决这一矛盾，经3年来大量的室内试验和12口井的现场应用，摸索出了以MMH为主体处理剂、BXJ为降滤失剂、NPAN为辅助降粘剂所组成的MMH钻井液体系。一般地层控制MMH的加量为0．2～0．3kg／m，降滤失剂BXJ一般加量为0．4％，需要降粘时加入少量NPAN。该体系具有独特的流变性，携砂能力强，能明显提高机械钻速，提高对油层的保护效果。
In view of the characteristic of mixed clays in the strata of southern Huabei Oilfield, mainly mixed with Yimeng, the MMH drilling fluid system was optimized. The purpose of adding MMH positive rubber is to improve the drilling fluid rheology, inhibition, in order to control the amount of fluid loss must also be added to the fluid loss reducer. After adding fluid loss agent, affecting the positive electrical properties of positive rubber. In order to solve this contradiction, MMH drilling fluid with MMH as main treating agent, BXJ as filtrate reducer and NPAN as assistant viscosity reducer was found out after a large number of laboratory tests in 3 years and field applications of 12 wells. system. Generally, the amount of MMH added in formation control is 0.2 ~ 0.3kg / m, the loss of additive BXJ is 0.4%, and a small amount of NPAN is needed when the viscosity is reduced. The system has a unique rheology, sand carrying capacity, can significantly improve the ROP, improve the protective effect of the reservoir.