泥浆地面降温联合隔热钻杆调控特深钻探井筒泥浆温度的分析研究OA

Ultra-high formation temperature poses a core challenge for extra-deep scientific drilling.To address the bottleneck where existing single cooling technologies fail to meet the temperature control requirements of a 13000 m wellbore,this study employs numerical simulation to evaluate the cooling performance of a combined approach integrating surface drilling fluid cooling and insulated drill pipe,with bottom-hole circulating temperature,maximum wellbore drilling fluid temperature,and return drilling fluid temperature as evaluation indices.The results indicate that applying the combined technology from 11000 to 13000 m can control the bottom-hole circulating temperature,maximum wellbore drilling fluid temperature,and outlet drilling fluid temperature at 285℃,291℃,and 63℃,respectively.Increasing the application length of insulated drill pipes can effectively reduce wellbore drilling fluid temperatures,and for every 0.1℃/100 m decrease in geothermal gradient,the bottom-hole circulating temperature and maximum wellbore drilling fluid temperature both decrease by 9℃.This research demonstrates that the combined technology can control key temperature parameters within a safe range for extra-deep drilling operations,providing a crucial theoretical basis for drilling engineering design and site selection,and offering technical support for the successful implementation of extra-deep scientific drilling projects.