SLAUGHTER ESTATE UNIT TERTIARY MISCIBLE GAS PILOT RESERVOIR DESCRIPTION

A reservoir description for the Slaughter Estate Unit tertiary pilot and surrounding area and the procedure that was used to obtain it are discussed. The procedure is based on matching waterflood performance prior to pilot miscible gas injection with a black oil reservoir simulator. An initial estimate of the reservoir description is obtained from petrophysical data and single-well pressure transient tests. The initial estimate is then modified by a trial and error procedure until a good match between the actual and calculated waterflood performance is obtained. It was determined that the Slaughter Estate Unit tertiary pilot had an original oil in place (OOIP) of 642,400 STB left bracket 102 133 stock-tank m**3 right bracket . A waterflood prediction derived from the reservoir description in this work indicates that a primary-plus-secondary recovery through Sept. 30, 1983, of 49. 6% OOIP would have been obtained from the pilot if waterflood operations had been continued.