Experimental and Simulation Studies of Oil Recovery Via Immiscible and Near Miscible Simultaneous Water and CO2 Injection in an Iranian Reservoir

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Seyyedsar, Mehdi | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43741 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Taghikhani, Vahid; Ghazanfari, Mohammad Hossein
Abstract:
A simultaneous water and CO2 injection study using sandstone cores with 21°API Sarvak (Azadegan field) oil has performed to evaluate oil recovery under four injection modes: secondary immiscible, secondary near-miscible, tertiary immiscible, and tertiary near-miscible. It is demonstrated that swag injection (secondary and tertiary) is an effective method for the recovery of significant amount of oil or residual oil from water-flooded porous media, but there is always some bypassing (at the pore level) of the oil due to topological effects, water-shielding and dead-end pores. In non-homogeneous porous medium, oil recovery is depending to SWAG ratio in immiscible and near-miscible conditions. Secondary SWAG injections can recover higher fraction of the remaining oil than tertiary SWAG injections. Higher oil recovery results from the oil being more accessible by gas due to less water-shielding effect
Keywords:
Carbon Dioxide ; Miscible Injection ; Immiscible Injection ; Near Miscible Condition ; Compositional Simulation ; History Matching ; Simultaneous Water and Gas (SWAG)Injection