低密度全油基钻井液体系是以0#柴油为基液,配合有机土、润湿剂、有机土增效剂、增黏提切剂、降滤失剂、碱度控制剂、密度减轻剂等添加剂配制而成,其密度下限可以控制在0.8~0.85g/cm3。在塔中11-2H水平井钻井过程中,该钻井液体系具有抑制性强、流变性好、润滑性好等特点,能够满足水平井等复杂井的要求,尤其适合低压地层和欠平衡钻井的需要。 Low-density oil-based drilling fluid system is 0 # diesel-based liquid, with organic soil, wetting agent, organic soil synergist, viscosity enhancer, filtrate reducer, alkalinity control agent, density reducing agent Such as additives formulated from the lower limit of its density can be controlled at 0.8 ~ 0.85g / cm3. During the drilling of the 11-2H horizontal well in Tazhong, the drilling fluid has the characteristics of strong inhibition, good rheology and good lubricity, which can meet the requirements of complex wells such as horizontal wells, and is especially suitable for low pressure formations and underbalanced drilling need.