Analysis of flow data from the DOW/DOE L. R. Sweezy No. 1 well

This topical report presents the results of work to-date on the analysis and simulation of flow and pressure data from the testing of the L.R. Sweezy No. 1 well. Analysis of drawdown data indicates a formation permeability of around 126 md, and a flow-rate dependent skin. The conventional analysis techniques were, however, found to be inadequate for analyzing the buildup data. The formation properties inferred from the drawdown were used together with the CHARGR simulator to simulate the production history of the Sweezy well. The calculated drawdown response displays excellent agreement with the measured data; such agreement was, however, not obtained for the buildup phase of the tests. Parametric calculations designed to investigate the anomalous buildup response suggest that this behavior may be the result of stress-induced hysteresis in formation properties, shale recharge, and long-term formation creep. A research program to further characterize the observed pressure response is outlined