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OH – ST - ET: Analysis of Dynamic Data in Shale Gas Reservoirs – Part 2
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4 - Nonlinear numerical model without desorption
In the next stage we use the numerical model. We match the same geometry as the analytical
model, and fracture interferences are taken into account. However, instead of using
pseudopressures we account for nonlinearities and simulate the real gas diffusion. At this stage
we do not take the desorption into account.
4.1 - Matching with the nonlinear numerical model
As in the previous section we start with the current parameters, coming from the nonlinear
regression using the analytical model. The simulated production is far above the real data. We
then fine tune the parameters in order to get a better match.
History match with the numerical model before refinement
5000
15000
25000
Gas rate [Mscf/D]
5E+8
1.5E+9
2.5E+9
Gas volume [scf]
qg
Qg
qg model
Qg model
0
1000
2000
3000
4000
5000
6000
Time [hr]
4000
9000
Pressure [psia]
Pi
p
Production history plot (Gas rate [Mscf/D], Pr ssure [psia] vs Time [hr])