Figure 1. The faster rate of oil recovery per pore volume (PV) of gas injected results in an earlier cash flow and higher IRR by lowering operating costs/bo recovered-- while operating at lower, immiscible pressures.
Figure 2. Remediation by CO of a swelling clay (5%)-quartz (95%) mixture damaged by a prior injection of low TDS water. Please note the increase of effective permeability from 1.8 md to 8.8 md and increase of 480%.
Figure 3. Application of the mixed gas (EORGAS) for marginally economic waterfloods having only a 1% oil cut. Please note the significant increase in additional oil recovered and the rate of recovery-at immiscible, existing waterflood pressures-as compared to pure CO2.
Figure 4. Demonstration of the effectiveness of the CO “workhorse” to recover oil by itself and at a faster rate-and higher volume-as compared to pure CO2, while still operating at low pressures. Also post CO injection, pure CO2 was sequentially injected and ultimately recovered the residual oil. Thus, the compatibility of the CO and CO2 has been demonstrated.
Figure 5. Heavy Oil Recovery, by the mixed gas (EORGAS) at existing reservoir conditions with no external heating required (80° F, 1850 psi). The CO facilitates low temperature recovery due to mobilization of the asphaltenes and associated long chain hydrocarbons to the well bore.