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OH – ET – VA - LL: Analysis of Dynamic Data in Shale Gas Reservoirs – Part 1 – Version 2 (December 2010)
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Some authors suggested that a second (compound) linear flow could occur later towards the
whole well+fractures group, as illustrated below. Such linear flow should be driven this time by
the perimeter of the SRV rather than the sum of individual fracture lengths. If both linear
regimes could be detected and quantified, then the uncertainty on the permeability would go.
Though possible in theory, we are somewhat sceptical about this. First it is inconsistent with
the assumptions that permeability is so low that only the SRV will be seen during the
commercial life of the wells. In this respect, finding a second linear flow outside the SRV seems
to be a poor excuse for a mismatch of the original straight line. Looking at the physical
geometry using an analytical or numerical model seems a better idea. In the unlikely case
where such flow exists and can be captured, it will also be present in the analytical and
numerical models. We will not devote a specific study on this hypothesis.