Improving recovery ef?ciency by CO2 injection at late stage of steam assisted gravity drainage

The high recovery performance of steam-assisted gravity drainage (SAGD) makes it a popular option for heavy oil resources. Currently, most the reservoirs developed by SAGD in China are late development phase, with energy consumption due to reduced thermal ef?ciency. use wind-down processes involving CO2 combination steam is considered as viable alternative limit consumption, and also reduce amount greenhouse gas emissions leaving behind reservoir. Study reveals that dissolution demulsi?cation chamber temperature reaches 200 ?C, solid phase deposition induced crude can viscosity emulsi?ed more than 50%. When extraction only 0.016 kg/m3 , rock wettability changes from lipophilic hydrophilic, higher reservoir temperature, stronger hydrophilicity is, which reduces adhesion power facilitates stripping surface. Numerical simulation studies have been carried out utilizing STARS obtain ef?cient utilization improved characteristics. Heat loss baseline 1.77 times injection process, but factor 2.48% higher. At initial stage injection, continues its lateral expanding, increases at about 6%. One year after channeling results lower traditional 38.4% injected stored this study. Cited as: Gong, H., Yu, C., Jiang, Q., Su, N., Zhao, X., Fan, Z. Improving ef?ciency assisted drainage. Advances Geo-Energy Research, 2022, 6(4): 276-285. https://doi.org/10.46690/ager.2022.04.02