Glenn Pool Field, Oklahoma: A case of improved production from a mature reservoir

a mature field, and yet contains substantial amounts of potentially remaini ng recoverable reserves. Glenn Pool is a giant oil field that has produced over 330 MMbbl (million barrels) oil from the Pennsylvanian Bartlesville (G lenn) sandstone using primary and secondary methods, with limited tertiary recovery efforts. Despite a long history of production, some production tra cts have recovered a total of only 21% of original oil in place, with many wells currently exhibiting water cuts of 99% or higher. Results reported here are part of a reservoir characterization and manageme nt effort aimed at improving recovery in Glenn Pool held, This effort invol ves an industry-academic-government partnership included within the U.S. De partment of Energy's Class I (fluvial-deltaic reservoir) initiative. Focus of the Glenn Pool Project has been on the field. A combination of detailed geologic study, geostatistical modeling, and reservoir simulation has been employed to design and implement improved recovery strategies. A crucial re sult of this work has been a reinterpretation of Bartlesville depositional systems and facies architecture in northeastern Oklahoma. With only one-qua rter of the total implementation plan in effect, oil production more than d oubled, exceeding expectations. Water production, however, remains high. Ad ditional management plans are under consideration.