Radius of Investigation and its Generalization to Unconventional Reservoirs
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The concept of radius of investigation is generalized to heterogeneous reservoir conditions including unconventional reservoirs with horizontal wells and multistage hydraulic fractures with the help of fast marching methods (FMM). The validity of the the Eikonal equation approach is established by comparing the FMM solution with the analytic solution. The FMM solution corresponds closely with the analytic solution and it does not have the problem with the front resolution as is observed for the numerical simulation. Generalization to heterogeneous media is found to be very straight forward and require specification of the spatial variation of the diffusivity. The FMM method is used to compute and visualize the propagation of the pressure front in unconventional reservoirs and also to understand the stimulated reservoir volumes.
author list (cited authors)
Datta-Gupta, A., Xie, J., Gupta, N., King, M. J., & Lee, W. J.