Petroleum engineering

it can be observed in figure 05 that as M≥15, gas recovery starts to decrease. This is because at
higher aquifer sizes, more water break into the well during its early life and bypasses the gas.
Therefore, volumetric displacement efficiency decreases and more gas trapped into the reservoir
(Ali, 2014).
1
Q
Production rate is also one among the apparent key considerations in a depletion scheme of a
reservoir underlain by an active water drive because of the potential water coning that may affect
the ultimate recovery.
A
Results show that, a low withdrawal rate below a critical coning rate will produce a water free gas over a long period of time while a high producing rate may considerably reduce a well’s effective producing life but the latter is somehow economically
attractive.
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Gas production rate

Field production life and water breakthrough time for different gas production rates

Field production life and water breakthrough time for different gas production rates

(After Tran et al, 2018).

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Reservoir horizontal permeability

Reservoir horizontal permeability

Tran et al, 2018 simulated the reservoir horizontal permeability in Sand20 reservoir in the
range 100-800md. They found that there is a negligible change in the gas and oil recoveries