Abstract
Parameter determination during an injectivity test relies on analytical models that fully foresee how pressure behaves when water is injected in the reservoir. Existing analytical models are able to depict both injection and falloff periods in single-layer reservoirs, but lack to describe the falloff period in multilayer systems. Therefore, this work attempts to extend the existing single-layer falloff formulation to multilayer reservoirs. The accuracy of the proposed solution was assessed by comparison with a numerical simulator. The suggested model was also used to determine the reservoir equivalent permeability.
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