Chemical EOR in a Conventional Heavy Oil Reservoir

Ivan Ulovich



This talk shows that waterflood recoveries in conventional heavy oil reservoirs are mainly driven by viscous and gravity forces. Always plot gravity vs. capillary numbers (Cinar, 2006); Capillary imbibition is an important factor as well but its magnitude has to be investigated further; High Sorw from the history match shows that contact angle hysteresis can be an important factor. Accounts for viscous fingering as per (Doorwar & Mohanty, 2017); A sand transport model is a useful tool to estimate the preferential locations and properties of a wormhole network. Limitations of the STM in STARS forces to use DP/DP formulation; Foamy oil effects could be modeled with a conventional solution-gas model; Polymer flood is a very efficient EOR process for heavy oil reservoirs; Viscous forces improve vertical sweep efficiency; VRR < 1.0 improves oil recovery due to lower BHP, higher injection rate, and fluid expansion (solution-gas/foamy oil effects); It is very important to obtain accurate adsorption values from the lab as RFs are very sensitive to this parameter.