One of the main activities of a reservoir engineer is to manage the production and injection of fluids in a reservoir. By managing the production and injection it is possible to react to the breakthrough of the injected fluids and control the rate at which BSW and GOR increase in the production wells. In wells completed in more than one target zone the reservoir management can be done by restraining or just closing the interval through which the injected fluids are inflowing. However to identify the interval through which the water or gas is produced in this kind of well is not an easy task, being the track of the paths through which the injected fluids flow in the reservoir (as well as in the neighborhood of the well) the main challenge of the reservoir management.

In this paper a set of data of different wells of a Santos Basin Pre-salt reservoir is presented. Intelligent completions with more than one target zone are installed in these wells and the temperature data of each zone are analyzed. Simplified analytical models are employed to describe the various regime flows observed in these wells, thus providing some insights in order to characterize the flow.

Temperature data of production and injection wells are analyzed in different scenarios were the gas and/or water saturation modifies near the wells. The main hypothesis adopted in this work is that the change in temperature behavior is associated to the modification of the saturation of the different fluids in the reservoir.

This paper aims at estimating the length of the modified saturation region near the injection well by assuming that the thermal diffusion is predominant. By doing so the problem is described by the energy balance equation and the boundary and initial conditions depends on the condition of the well (if it is operating or closed).

This methodology is further extended to analyze the change of fluids saturation near production wells in order to provide some insight about the breakthrough of injected fluids.

By comparing the theoretical response of the methodology presented in this paper to that observed in the wells it is possible to make some conclusions about (i) the injection profile in wells where the isolation between the zones in the well's neighborhood was lost during the stimulation of the formation and (ii) about the distribution of the injected fluid in the reservoir near the wells, whose isolation between zones was not lost during the stimulation.

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