松辽盆地头台油田油热协同开发注采参数优化OA

In the context of global low-carbon energy transition,the resource utilization of residual heat in reservoirs has become a crucial direction for sustainable oilfield development.Taking Block T of Toutai Oilfield in Songliao Basin as the research object,study on the technical and economic feasibility of converting low-efficiency oil produc-ers into geothermal wells is conducted.A coupled thermal recovery model for reservoirs is established based on the CMG-STARS platform to quantitatively analyze the effects of water injection temperature,injection-production flow rate and production timing on heat extraction performance.The results show that,sidetracking and fracturing fol-lowed by"oil production first,then geothermal conversion"development maximizes the benefits of low-productivity oil wells.Simulation prediction indicates that the optimal timing for converting to geothermal development is when oil production declines to 1.3 t/d after 4 years of oil production.Under the same injection rate,increasing injection temperature from 5℃ to 20℃ reduces the produced water temperature difference,with cumulative heat extraction decreased by 16％.However,at the same temperature,when the injection flow rate increases from 300 m³/d to 1440 m³/d,heat production doubles,while the produced fluid temperature decreases by 11.5℃.The optimal injec-tion-production scheme is recommended to be an injection temperature of 20℃ and a water injection rate of 480 m³/d,achieving a 10-year cumulative heat extraction of 420 TJ,which meets the heating requirement of the joint sta-tion.In the 5th year of thermal recovery,heat loss rate exceeds the critical value of 10％,formation temperature re-covery reaches a peak of 9.42℃,and thermal regeneration efficiency systematically declines thereafter,forming a thermal modification zone with a radius of 35 m.The research provides a theoretical basis for the implementation of"oil-geothermal co-production"project in oilfields and has promotion value for low-carbon utilization of unconven-tional resources.