Novel Water-Based Mud for Low-Permeable Reservoir in South China Sea

Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result technical such as hole-cleaning openhole horizontal intervals. Hence, novel fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed boast high low shearing rate viscosity, provide promising cutting, carrying, suspension capabilities. Furthermore, performed well protection, with a permeability recovery of more than 90%. The also have inhibition capabilities linear expansion mud shale 10%, rolling up to 96.48%. Field application results no pipe-stuck encountered during tripping interval when using fluid. Moreover, fluids, skin factor reduced from 20.0 −3.0, daily oil production double what expected. It concluded meets demand intervals improves protection well.