Abstract
Summary This paper presents a procedure for interpreting data acquired with permanent downhole pressure sensors in association with surface or downhole rate measurements. The usefulness of this data source in reservoir description and well performance monitoring is illustrated. Unlike previously published examples, this interpretation is based on the analysis of a stream of data acquired over a long period of time, thus taking advantage of the continuous nature of the measurements. Three field cases are presented using the pressure and rate data in decline-curve analysis for wells with a variable downhole flowing pressure. Because such an interpretation is conducted while production continues, the interpretation is particularly well suited for a well or group of wells under extended testing that are equipped with downhole gauges and are flowing through surface separation and metering systems. Wells completed with both permanent downhole rate and pressure measurements are also ideal candidates for this analysis. Finally, the influence of the pressure sensor long-term drift and the rate measurement error on the interpretation results and future forecasts are investigated.
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