Pressure Test Analysis of Gas Bearing Formations

摘要

The Reservoir Characterization Instrument (RCI~SM), a new generation wireline formation tester developed at Western Atlas, is capable of controllign fluid sampling operations from the surface, and acquiring and analyzing corresponding rate-pressure data in real-time to estimate formation pressures and core-scale permeabilites. These data, along with fluid properties derived from the collected samples, are essential in evaluating reservoir performances, and designing well completions and surface facilities. For interpretation of pressure test data in liquid saturated formations, a Formation Rate Analysis (FRA~SM) technique has been developed recently. The technique is not directly applicable to gas formations because compressibility, density and viscosity of gas are strong functions of pressure. Moreover, appreciable temperature changes and inertial pressure drop or non-Darcy flow effects may occur during gas formation testing.