Abstract
Understanding the hydraulic characteristics of the matrix frame, natural fractures, and created hydraulic fractures as a function of effective confining stress, is vital to design optimum stimulation treatments, and to predict reservoir performance via reservoir simulation, and to maximize productivity from these challenging reservoirs by following a smart depletion strategy. Critical parameters that are stress dependent in tight gas reservoirs are: matrix absolute and relative permeabilities, capillary pressure, and natural and hydraulic fracture conductivities. An experimental procedure was designed to simulate the reservoir permeability (matrix, natural fractures and induced fractures) reduction as a function of increasing effective stress.Depleting a tight gas reservoir at high pressure should be based on extensive study of how the matrix and natural fractures behave under pressure history. The smart depletion involves two possibilities: 1) maintaining high pressure depletion, 2) injecting non-fuel gas to produce the fuel gas at the required reservoir pressure.
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