CO2 Sequestrated EOR

1. Does FCM displacement yield a single-phase transition zone separating the injected solvent from the crude oil?

FCM: Is it piston-like with the most efficient recovery?

Whether, MCM drive remains to be analogous to near miscible process?

Whether, the vaporization zone of intermediate components and extraction zone of C5 through C30remain developed in MCM, which results in residual saturation lower than immiscibility but greater than FCM?

2. Under reservoir conditions, whether, the first contact miscible generally occur?

In other words, would it remain technically and economically feasible to inject a gas that is first-contact-miscible (FCM) with the oil?

Instead, whether, the injected gas is designed to develop miscibility by the net transfer of components from the oil into the gas (a vaporizing gas drive) or from the gas to the oil (a condensing gas drive)?

How about

(a) ‘Net Transfer of CO2Molecules getting dissolved into the Oil’?

(b) ‘Light to Intermediate Components of Oil’ ‘Getting Vaporized by CO2Gas’?

3. If the contents of heavy components in the crude oils remain to be high, and if the temperatures of the reservoirs remain to be high; then, could a miscible phase be achieved under reservoir pressure conditions?

Dr Suresh Kumar Govindarajan

Professor [HAG]

IIT–Madras 04-March-2025