Core flood test procedure

Effective Viscosity Calculation in Cores at Sor- The calculation procedure for effective viscosity was complicated by the fact that oil was produced during the polymer floods. That caused k, or to increase from flood to flood, thereby changing the reference, AP>w> for each polymer solution tested. The basic equation for calculating the effective viscosity was... 

Polymer flow tests consisted of sequentially injecting 300-ppm polymer, 600-ppm polymer, and brine. Solutions were prepared and used in a manner that minimized chemical degradation. Each flood sequence was continued until both effluent polymer concentration and resistance factor stabilized. In some cases, polymer injection was terminated before fluid of injection concentration was produced. Details of the experimental procedure are included in Appendix A. The resistance factor at a given stage of the polymer flood was determined as the ratio of the flowing pressure drop at that stage to the initial brine pressure drop at the same rate. Figs. 1 and 2 exhibit the extremes of concentration response observed with these cores. Core 55 rapidly attained a produced concentration equal to the injected concentration, while Core 42 reached a maximum produced concentration of about 96 percent of injected. 

The objective of this study was to determine the polymer flood potential in Pengrowth s East Bodo Reservoir through coreflood tests. A waterflood was conducted first on a single core, followed by a polymer flood. In this procedure, the incremental recovery of the polymer flood above waterflood recovery is clearly defined. The coreflood was conducted on reservoir core samples selected by Pengrowth with synthetic brine and oil samples from the East Bodo Reservoir to match reservoir conditions. 

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