1998 Annual Report
Grigg, R.B. and Schechter, D.S.:
“Improved Efficiency of Miscible CO2 Floods and Enhanced Prospects of CO2 Flooding Heterogeneous Reservoirs,”
Annual Report, Contract No. DE-FG26-97BC15047, U.S. DOE, (July 1998).

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Abstract

The goal of this project is to improve the efficiency of miscible CO2 floods and enhance the prospects for flooding heterogeneous reservoirs. Results of the first year of the three-yr project are presented under three main topics:

  1. fluid and matrix interaction,
  2. conformance control/sweep efficiency, and
  3. reservoir simulation.
The study of the effect of oil saturation on foam showed that CO2-foam improves CO2 breakthrough time and oil recovery. Mixed surfactant foaming agents were tested to see if mixtures were detrimental or synergistic when analyzing foaming properties. One mixture of a nonionic and an anionic surfactant was found to have better foaming stability, mobility reduction and selective mobility reduction than the anionic surfactant alone. Simulation studies on a foam pilot area resulted in an accepted history match model. A laboratory study to aid in the development of a gravity drainage reservoir model was undertaken on the Wellman Unit.