ESTIMATION OF FREE-HYDROCARBON RECOVERY FROM DUAL-PUMP SYSTEMS

Free-product hydrocarbon which floats on the water table may be recove red using single-pump and dual-pump systems. The factors that affect t he long-term free-product recovery using dual-pump systems include the free-product thickness as measured in monitoring wells, the ground-wa ter pumping rate, hydrocarbon density and viscosity, and the soil perm eability. This paper presents a simple model for prediction of free-pr oduct recovery using dual-pump systems. The model predicts the long-te rm rather than short-term recovery rates, and lends itself to spreadsh eet calculations on microcomputers. A particularly simple form arises for cases where the drawdown is small. An application for estimating r ecovery from a dual-pump system is presented, and limitations of the m odel are summarized.