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International Journal of Petroleum and Geoscience Engineering
IJPGE 2021, 15 pages - Article ID: IJPGE-2109182112396
A New Immiscible Water Alternating Gas (I-WAG) Scheme for Improvement of Displacement Efficiency in Dipping Reservoirs
EOR Center, UniversitiTeknologi PETRONAS, Seri Iskandar, Malaysia
Tulsa University, Tulsa, USA
ABSTRACT
The success of the hydrocarbon recovery improvement via water alternating gas injection is closely related to the microscopic displacement and macroscopic sweep efficiencies by maximizing the three-phase zones and optimizing force balance. Although the WAG process improves the sweep efficiency by controlling the mobility of gas in the cycle of water injection, the improvement will not be optimum in dipping reservoirs. In such reservoirs, a water and gas injection scheme plays an important role in the optimization of sweep and displacement efficiencies. In this paper, the efficiency of various WAG injection schemes toward the improvement of recovery factor will be presented. A new injection scheme is proposed. In the new proposed scheme, water is injected from down dip, and gas is injected from up dip in the first cycle. In the second cycle, gas is injected from down dip, and water is injected from up dip. Water and gas injection locations will alternatively change in each cycle of injection. Different parameters are studied including mobility ratio, anisotropy ratio (kv/kh), injection rate, WAG injection cycle. The results show that the proposed scheme has a significant improvement on the displacement efficiency and three-phase zone size and hence yields higher hydrocarbon recovery.
Immiscible Water Alternating Gas (I-WAG); Displacement Efficiency; Dipping Reservoirs; Improvement Oil Recovery Factor; Three-Phase Zone.