This paper examines the transient pressure response from slug tests in wells completed in multiple, hydraulically fractured coal seams. We developed a model for stimulated wells producing from commingled reservoirs, i.e., reservoirs in which the layers communicate only at the wellbore and not in the fracture or reservoir. With this model, we have investigated the effects of various reservoir properties on the slug test pressure behavior and have found that the characteristic pressure response depends more on the contrast between layer properties than their absolute values. We also present a method for correlating the slug test pressures from multi-layer and single-layer reservoirs, thus allowing us to use single-layer type curves to analyze slug tests.

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