When cold water is injected into a reservoir at initial temperature conditions, the sands around the water injector into which injection occurs will be cooled down to virtually the temperature of the injected water. The resulting temperature distribution can be described by simple expressions even in the case of a multi-layered reservoir. The presence of such a cold water bank has a strong bearing on injection performance. In order to arrive at a correct interpretation of pressure fall-off surveys conducted in water injectors it is essential to take the temperature distribution into account. Some field examples will be discussed.

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