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CSP performs poorly because the presence of continuous free methane saturation at the start of production cycles results in high gas mobility, and, consequently, quick methane production, quick pressure depletion, and a significant loss of oil viscosity reduction.
FAWAG may be implemented to solve the persistent challenge of high gas mobility during WAG.
MGI is a single-phase scheme and therefore affected by high gas mobility.
In zones with direct communication, there was an observed tendency of early gas breakthrough due to the high gas mobility.
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Rossen et al. (1995a) pointed out SAG foam processes can combine high gas injectivity with low mobility at the front of the foam bank, which offers an escape from the dilemma posed by early modeling, i.e., improved vertical sweep of gas with foam requires an increase in injection pressure (Shi et al. 1998).
Foam reduces the gas mobility by plugging high permeability 'thief' zones, and hence delays gas breakthrough and reduces the GOR.
However, a huge amount of gas trapped in the core indicated by the residual pressure drops as high as 4 psi across the whole core is beneficial enough to the gas mobility control.
Higher pressure differential (Δp) values by MRF experiments indicated greater reduction of gas relative permeability (gas mobility).
High-pressure differential values by injected CO2 slugs in both SAG1 and SAG2 cycles resulted in reduction in gas mobility due to generated foam inside the core.
High gas taxes.
Hurray for high gas prices!
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