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Performance of near-miscible simultaneous water and CO2 injection for oil recovery in secondary and tertiary modes

Seyyedsar, S. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Simultaneous water and CO2 injection has been performed on a sandstone core to evaluate oil recovery under the secondary and tertiary near-miscible injection modes. It is demonstrated that secondary SWACO2 injection as well as tertiary flood is an effective method for the oil/residual oil recovery from oil saturated/water-flooded porous media. In the secondary SWACO2 injection, the ultimate oil recovery increases by increasing SWAG ratio from 0.2 to 0.4 but due to some limits, e.g. topological effects, prohibiting contacting of injected gas with residual oil in pores, altering SWAG ratio from 0.4 to 0.6 showed no effect on ultimate oil recovery. Secondary SWACO2 injection can recover higher fraction of the oil than tertiary SWACO2 injection. Higher oil recovery results from the oil being more accessible by the injected gas due to less water-shielding effect. The results of this work can be helpful to better recognition and selection of gas-based oil recovery methods to be implemented in depleted reservoirs
  4. Keywords:
  5. Carbon dioxide ; Floods ; Oil shale ; Oil wells ; Petroleum reservoir evaluation ; Petroleum reservoirs ; Porous materials ; Secondary recovery ; Depleted reservoirs ; Injection mode ; Oil recoveries ; Residual oil ; Sandstone cores ; Topological effects ; Water injection
  6. Source: 76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 ; Nov , 2014 , p. 1007-1011
  7. URL: https://pureapps2.hw.ac.uk/portal/en/publications/performance-of-nearmiscible-simultaneous-water-and-co2-injection-for-oil-recovery-in-secondary-and-tertiary-modes%28979f420c-9c0d-4767-9ae9-e76eb68371e2%29/export.html