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Efficient Experimental Design for Optimal Oil Recovery through Field Scale - Gas Assisted Gravity Drainage (GAGD) Proces
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Unlike the conventional gas injection modes of CGI and WAG, the Gas Assisted Gravity Drainage (GAGD) process takes advantage of natural segregation of reservoir fluids to provide gravity stable oil displacement. Therefore, CO2 has been considered for immiscible injection in the Wasson Oil Field, located at West Texas. The GAGD process has been applied using the compositional reservoir simulation and PVT modeling to reduce the water cut and increase oil recovery.
The GAGD process consists of placing a horizontal producer near the bottom of the payzone and injecting gas through existing vertical wells that have been used in prior waterfloods. As the injected gas rises to the top to form a gas zone, oil and water drain down to the horizontal producer.
In this study, compositional simulations of GAGD process and regular CO2 miscible flooding have been done on the Wasson Oil Field. A five-spot with 4 vertical injectors and one horizontal producer has been considered for regular CO2 injection and GAGD process in five years of production, respectively. The Latin Hypercube sampling has been adopted for generating multiple simulation runs in order to find out the most influential factors affecting the flow responses and to get the optimal solution.