Tracer Breakthrough Time for the Rate-Pressure Doublet

Abstract

A pressure transient analysis method is presented for interpreting breakthrough time between a constant rate well and a constant pressure well. The wells are. modeled as two line sources in an infinite reservoir where the first well injects at a constant pressure and the second well produces at a constant rate. The effects of transient pressure conditions, the distance between the wells, the flowrate, and the tracer injection time on breakthrough time are examined. The first arrival of injected fluid at the production well is significantly longer under transient condition than under steady state condition for. the ratepressure model when the injection pressure is equal to initial reservoir pressure. An injection pressure larger than initial reservoir pressure significantly reduces the breakthrough time, and may yield a breakthrough time significantly smaller than the breakthrough time for the steady state case.