부산대학교 도서관

The deep shale gas drilling has high risk, such as the poor drillability and significant changes in formation lithology. It is necessary to optimize drilling parameters. This research established the geological, mechanical model and rock mechanical models. It can monitor drilling friction, torque, mechanical specific energy, and ECD by real-time tracking optimization software. The results show that the field drilling fluid density can be optimized based on the formation three-pressure profile. This method was successfully applied in the drilling process of deep shale gas wells in the West Chongqing block, and it avoided complex situations such as well control and well collapse. The real-time tracking software EPDOS DMI analyzes the influence of drilling parameters on the mechanical penetration rate and specific energy, such as weight on bit, rotating speed, and working pressure difference. The mechanical penetration rate and mechanical specific energy can timely and accurately judge the bit wear. This research can provide technical support for the safe and efficient drilling of deep shale gas. [ABSTRACT FROM AUTHOR]