Measured temperature behaviour over the reservoir section in a production or injection well is influenced by various factors,including reservoir presence, reservoir quality,completion architecture and fluid flow profile.In the producing section of a well,temperature is dominated by effects resulting from flow,and the relative proportion of the fluid phases.This temperature can be used to estimate a production profile including the relative amount of fluid produced at each interval.Oil,gas and water fluid phases have different thermal properties and in a controlled environments,the temperature can help define the proportion of each phase being produced. In conventional production logging,tool strings include a temperature sensor.Temperature can also be obtained by deploying optical DTS(Distributed Temperature Sensing)in the well. This paper discusses some of the parameters that control temperature behaviour in producing wells.How sensitive the temperature is relative to these parameters and how unique that production profile is when back- calculated from temperature data. A robust flow profile was build using conventional production logging data using the temperature as an additional constraint.A series of flow scenarios were identified with production logs from offset wells and used in sensitivity analysis modelling.This was the basis for a feasibility study for DTS deployment. Several cases were found where the temperature profile was identical to a chosen base case temperature,for very different inflow scenarios.These different scenarios were significant enough to impact well remediation or reservoir management decisions.This paper presents the critical parameters used in DTS profile analysis and the associated uncertainty for this environment.The addition of qualitative DAS (Distributed Acoustic Sensing)data will be demonstrated as a key input to help constraint the possible scenarios and achieve a more unique solution.
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