In an effort to better understand the geologic and engineering factors that explain the production performance of the tight Clinton sandstone of Eastern Ohio, logs, completion data, and production performance records were evaluated for a number of Clinton sandstone wells in east central Ohio.
The wells were divided into low slope (linear) and high slope (radial) groups based on plots of log cumulative production versus log time. The distributions of expected recoveries from these two groups of wells were compared using the chi square and Pearson's P-M correlations, and were found to be significantly different. The linear wells had a median expected ultimate production of less than 20 MMcf (5.7 × 105 m3) while the radial group had a median of more than 50 MMcf (1.4 × 106 m3). Some of the wells tended to be located in contiguous trend areas. The distance to the drainage boundary was also calculated for the linear and radial wells. The median length for the linear wells is about 500 feet (150 m) while the median radius for the radial wells is about 2,000 feet (600 m).
The intent of this paper is to provide industry with a methodology that can be used to calculate reservoir parameters, such as size and geometry, which are important in designing stimulations and in estimating reserves.