Production analysis of actual data shows long-term transient flow geometries with boundaries in a large number of gas wells which are produced from tight gas reservoirs. In this paper, long-term linear and bilinear flows caused by the presence of natural fracturing are discussed. Linear and bilinear flows as a source of matrix block drainage are investigated. Systematic methodologies to analyze production data for estimation of reservoir properties and OGIP under linear, bilinear, and boundary dominated flows in tight gas wells are described. Application of these methodologies in various actual tight gas wells from industrial sources and validation of these procedures by using numerical simulation are shown. Long-term transient flows and short fracture half-length in various post hydraulic fractured wells suggest the convenience to develop tight gas fields with a tighter spacing between wells.

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