Diagnosis of Horizontal Injectors with Distributed Temperature Sensors

摘要

We present an interpretation methodology for analysis of temperature profiles obtained in horizontal injectors with fiber optic distributed temperature sensors. We consider injection as a non-isothermal process, due to the contrast in the temperature of injected fluid and reservoir fluid. We examine the particular case of water injection in an oil-bearing reservoir and analyze a field case with a notable temperature contrast downhole (222 °F reservoir, 100 °F water). We examine the behavior of the wellbore temperature profile during injection, shut-in, and post-shut-in periods, for both short-term and long-term injection (days to months). We present a methodology for estimation of the injectivity profile along the length of the well during short-term injection, and discuss issues associated with interpretation of long-term data. The proposed methodology can be applied to injection testing of producing wells.