ECO2N/T2WELL to initialize a depleted reservoir (low pore pressure)
Dear TOUGH/T2WELL Users.
I’m modeling CO₂ injection with T2WELL + ECO2N. The injection point is at the wellhead (top wellbore element). With a hydrostatic initialization I can inject CO₂ through the wellbore into the reservoir and the model behaves as expected.
Now I need to represent a depleted reservoir. In Lehua et al., 2011, “Transient CO₂ leakage and injection in wellbore–reservoir systems for geologic carbon sequestration” (Case 3), they note: “The initial pore pressure is arbitrarily set at a low value for the depleted reservoir.”
Question: Is it considered acceptable/best practice in ECO2N/T2WELL to manually set a lower initial pore pressure profile (vs hydrostatic) to represent depletion? Or are there recommended, more consistent ways?
1 reply
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The best approach is using an initial condition that can represent the real situation. For example, if the reservoir was depleted by 3 MPa, you can have the elements at well screen has a pressure 3 MPa lower than original pressure and set these elements to a large volume (v=1.0e50) and run the model to quasi-steady state.