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Features on Pressure Drop and Methods to Evaluation Reserves of Commingled Unconsolidated Sand Reservoir

The static test data of past years the Sebei gas field are classified. The reason why the pressure drop-down curve are straight, or ascends or curves downward are analyzed with the characteristic of water influx, reperforating, transfer layers, sand burial, sand control, layers and wells interference of the typical wells. Then, two revised material balance models based on the deviation of pressure drop curve are introduced to calculate the dynamic reserve of this gas field with different pressure drop curves. It was proved that the method is an effective approach to evaluate precisely dynamic reserves of gas wells.