Feasibility Analysis And Study Of CO₂ Flooding In Block 14

Block 14 of Horqin Oilfield is a structure-lithologic reservoir,which belongs to low permeability development reservoir.At present,the main way of development is waterflooding.Due to the long mining time,the current water injection development is poor,the water injection effect and the initial contrast is not obvious,well has been serious water channeling phenomenon,not suitable for water injection development,the need to change the development mode.According to the geological characteristics of the oilfield and the actual production situation,the GRE reservoir integrated numerical simulation software was used to model and simulate the remaining oil distribution in Block 14,and the CO2 test well group was studied.Through the CO2 expansion test of formation oil injection,the study and determination of minimum miscible pressure between crude oil and CO2,and the experiment of CO2 flooding,the effect of CO2 flooding in Block 14 is analyzed,and the results of reservoir CO2 adaptability are analyzed.The injection scheme design was carried out in the experimental area screened out from Block 14.By comparing the development results of three kinds of models,such as simple carbon dioxide drive development,gas-water injection development and conventional water drive development,the development method of gas-water alternation was determined by the optimization of numerical simulation scheme.