By OGJ editors
– Rex Energy Corp., State College, Pa., reported encouragement from a single-well alkaline surfactant polymer test in the Middagh Unit in Lawrence field in Illinois.

The test consisted of a chemical tracer to validate the chemical recipe formulated by the University of Texas and to measure oil saturation before and after ASP injection. Estimated residual oil saturation was 28% before ASP injection and 8% afterward, which equates to 20% of pore volume recovered or 27% of original oil in place recovered.

The company said the results exceed by 55% the recoverable oil assumption used by outside to estimate the potential of this process in Lawrence field even though they are based on a single well test only.

Rex Energy is preparing the unit for ASP injection starting in August 2010 across the 15-acre initial flood area.

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