Application and research of quantitative water injection to improve oil recovery in Tahe carbonate oil field

Carbonate reservoirs in the Tahe oil field are featured by great burial depth and strong heterogeneity. Oils mainly reserved in dissolved pores, caves and fractures, while fractures worked as the main seepage way. As formation energy decreases in oil field, water injection has become a most promoted way to supply energy thanks to high economic returns. According to the principle of material balance, with acid fracturing curve, water flooding curve and energy curve, we calculated the volume of water, made a better understanding of the relationships between water injection and recovery, and then optimized injection-production parameters, to improve the water flooding efficiency and oil recovery.