Abstract
Abstract The estimation of the reservoir permeability, a variable of great importance in hydraulic fracture design, is frequently inaccessible because candidate wells either do not flow or a pretreatment pressure transient test would be inordinately long (and expensive). A methodology for the interpretation of a fracture calibration treatment has been developed that allows the calculation of the permeability in addition to the traditional results of the "leakoff coefficient", closure pressure and fluid efficiency. Here, gas reservoir field cases are presented and interpreted with this method. A log-log diagnostic plot of the rate-normalized pressure and its derivative was employed to account for a multi-rate injection (fluid leakoff) and it is used to identify the transient reservoir response during fracture closing. The reservoir permeability can then be estimated from a specialized plot. This procedure is verified by a pressure match.
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