The 555' Pool, discovered in 1957 and unitized in 1961, is located on the northwestern nose of the Buena Vista Hills anticline in the western San Joaquin basin, Kern County, California. The trap is a combination of stratigraphic pinch-out and anticlinal rollover with approximately 750 ft of closure. Two distinct productive intervals in the upper Miocene Stevens Sand are present, namely, the massive sand zone, comprising thick (< 1,000 ft) turbidite channel sands, and the Interbeds zone, comprising interbedded sands and shales about 500 ft thick. Cumulative oil production for the Massive and Interbeds zones is 44.9 MMBO (44% recovery of OOIP) and 4.2 MMBO (35% recovery of OOIP), respectively. Workover results in the middle to late 1980s led to incremental improvement in production rates and the realization that substantially more reserves may be located behind pipe within the field limits. A multidisciplinary task-force reviewed all available historical core, log, drill-stem test, and production data in addition to workover results and gas identification logs. This review resulted in an improved reservoir description, better geological reservoir characterization, and the identification of possible reserves not accessed by then-current completions. Reserve estimates were made by simultaneous solution using material balance and volumetric methods.more » This study projected a significant increase in the remaining recoverable reserves. New workover wells have resulted in substantial improvement in production rates and an amended interpretation of the location of the oil band.« less
'%3e%3cpath fill='%23012169' d='M0 0v30h60V0z'/%3e%3cpath stroke='%23fff' stroke-width='6' d='m0 0 60 30m0-30L0 30'/%3e%3cpath stroke='%23C8102E' stroke-width='4' d='m0 0 60 30m0-30L0 30' clip-path='url(%23b)'/%3e%3cpath stroke='%23fff' stroke-width='10' d='M30 0v30M0 15h60'/%3e%3cpath stroke='%23C8102E' stroke-width='6' d='M30 0v30M0 15h60'/%3e%3c/g%3e%3c/svg%3e)