Production of either wells completed in low permeability reservoirs or damaged wells has been possible because of hydraulic fractaring. The estimation of both the geometric and flow characteristics of a fracture represent a useful information for the calibration of fracture design methods and permits fore casting well flow behavior.

Transient pressure well test analysis has been used with success to estimate well conditions and reservoirs parameters. Conventional methods of interpretation are based on radial flow theory. This is a limitation when applied to fractured wells because they exhibit other type of flow at different times in a test.

Several authors have presented different techniques to calculate both reservoir and fracture parameters. These methods include the linear flow graph (Δp vs t), the bilinear flow graph (Δp vs Lt), the semilog graph (Δp vs log t) and type curve matching. Among these techniques, the type curve method deserves special attention because it allows both the analysis of pressure data and the detection of different flow regimes.

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