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Abstract This paper describes the status of a 23-acre, six-pattern steamflood pilot in the thick (300 ft) steeply-dipping (10 °) Monarch sand, Section 26-C, Midway-Sunset Field after 18 months of steam injection. The steamflood response shows a significant increase in oil production (520 B/D) relative to cyclic stimulation response. The response is significantly affected by preferential permeability, areal confinement and localized barriers to vertical flow. The observation well temperature profiles confirm that the low permeability zone just above the steam injection interval is at least a local barrier to vertical steam flow. Differences between steamflood performance and previous simulator predictions were due to reservoir heterogeneities not accounted for in the simulator study. Introduction A six-pattern steamflood pilot was initiated in November 1975 in the thick Monarch sand of the Midway-Sunset field. The main objective of the pilot was to demonstrate that a very thick, dipping, heavy oil reservoir can be steamflooded successfully. The design and simulation of the pilot are described in a previous paper. Based on log data obtained prior to the coring of the pilot observation wells, the Monarch sand was thought to be reasonably homogeneous. Examination and analysis of the cores showed that this was not the case. These results were used to develop a geologic model which is described in a companion publication. This model and References and illustrations at end of paper. |
