Method for enhancing shallow heavy oil reservoir production

Abstract

The method for enhancing shallow heavy oil reservoir production is an enhanced oil recovery method for shallow heavy oil reservoirs using cyclic steam polymer injection. The method involves injecting steam into the reservoir through an injection well, shutting down the well for three months to allow the steam to soak into the reservoir, then opening the well and injecting a viscous polymer concentration of 0.7 lb/STB into the reservoir. The cycle may be repeated three times over the life of the reservoir. The heated steam reduces the viscosity of the heavy oil, and the polymer displaces the oil to the production well. The method avoids the production rate drop normally associated with steam injection. Although continuous steam injection produces a higher cumulative oil production, cyclic steam polymer injection has lower capital cost and produces a better Net Present Value (NPV).