The Infill Drilling Predictive Model (IDPM) is in a style similar to previous Enhanced Oil Recovery Predictive Models which were developed for and in conjunction with the Chemical Task Group of the National Petroleum Council (NPC) for use in the 1982-1984 NPC study on enhanced oil recovery (EOR) potential. The model is designed to conform to the methodology and structure of the suite of models used in that study. This insures that all models calculate and report predicted oil recovery and economics in an identical manner. As do the other models, the IDPM contains an extensive set of default equations to calculate non-critical reservoir properties, flood properties, and economic criteria. The Department of Energy, Bartlesville Project Office, supported the NPC and has maintained the models since the NPC study was completed.