Gels for Conformance Improvement in Gas EOR Flooding
The sequence followed during our core experiments is listed in Table 1. First, at ambient conditions, the cores were saturated with brine and porosities were determined (Step 1 of the sequence on the following page). All subsequent steps were performed at 41°C. Three experiments were performed at 900 psi (61 atm), while three others were performed at 1500 psi (102 atm). When saturating a given core, the brine composition was the same as that used in preparing the gelant formu- lation. Cores were mounted so that the flow was horizontal. Steps 1 through 4 were performed to charac- terize permeabilities, porosities, and brine and gas mobilities. The rock properties were similar for the dif- ferent core experiments. Brine permeability averaged 650 md, and porosity averaged 0.21. During injection with back pressures of 900 or 1500 psi, the mobility of brine was the same as that at atmospheric pressure.
Figure 1: Schematic of the coreflood setup
