Research and Application of Optimization of Drilling Fluid System in Adjustment Wells in Bohai Oilfield
Due to the characteristics of reservoir geological sedimentation and stratigraphic well pattern,as well as the damage of long-term water injection development to the original pressure system of the formation in Bohai Oilfield,in the process of drilling,it mainly faces the problems of complex pressure system,water-sensitive soft mud shale formation grouting and low-pressure depletion reservoir protection.The rheological stability and pressure plugging capacity of the PEC drilling fluid system were optimized in the laboratory,which could significantly improve the rheological stability of the drilling fluid drilling in water-sensitive shale,and at the same time,it could greatly improve the pressure plugging capacity of the drilling fluid,and the reservoir protection effect was good,and the permeability recovery value was above 90%.The optimized drilling fluid system was successfully applied in the Bohai Oilfield,and the rheology of the slurry section was stable,the drilling efficiency was significantly improved,the well construction period was shortened,the development timeliness was improved,and the application effect was good,which met the dual requirements of drilling engineering safety and reservoir protection in the pressure exhaustion formation of Bohai Oilfield.
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