Paper: An Intergrated Study of A Portion of The Foster (GrayburgSan Andres) Field, Ector County, Texas

A cooperative two-phase study of the Grayburg/San Andres reservoir is being conducted in response to the United States Department of Energy's (DOE) Class II Oil Program. The study's purpose is to preserve access to existing wellbores by identifying additional reserves. Phase I was an integrated Geological, Geophysical, and Engineering study to determine if state-of-the art technologies, including 3D seismic and sequence stratigraphy, could be integrated into a reservoir simulation to enhance oil recoveries in this 66 year old field. At the end of Phase I, recommendations for new drills, deepenings, and workovers were made. Data gathering in Phase II included taking cores in three new drills to evaluate stratigraphy, running pressure buildup and production tests and injection profiles in existing wells, and RFT's and modern log suites in new drills and deepenings to evaluate reservoir conditions. Attribute analysis of the 3D data was integrated into the decision making process during Phase II. The results of three new drills, one deepening, four workovers, and two conversions to injection were to increase production by 50%. Injection water quality has been improved and a waterflood realignment implemented.