This paper presents a case study of three producing coalbed-methane wells with various productivities in the Oak Grove field. Each well is examined in terms of geologic setting, stimulation effectiveness, simulator-predicted recoveries, and observed well performance to gain insights into the mechanisms responsible for variability in coalbed-methane will performance. Local variations in geology and reservoir properties significantly affected the effectiveness of hydraulic fracture treatments and, hence, gas production rates from these wells. Treating pressures were matched with a fracture model, and fracture geometry was estimated. A reservoir model; confirmed mechanisms responsible for production variations.