Abstract
Abstract This paper presents an analysis technique for characterizing reservoirs from production performance. Unique to this technique is the incorporation of the instantaneous bottom-hole flowing pressure (BHFP) to both the production rate and to the cumulative production for a well depleting a reservoir. This allows a single rate/cumulative analysis for wells producing with constant BHFP, constant rate, and wells with variable rate or variable BHFP (including wells with shutins). This solution provides a powerful diagnostic type-curve which can be generated with almost any wellbore/reservoir situation encountered. Extension of the method to gas reservoirs through use of pseudopressure and viscosity-compressibility normalization allows these wells to be analyzed using the slightly-compressible fluid solution. Well performance during transient flow and depletion flow are examined. Simulation results are compared with the analytic solution. The use of spreadsheets to perform well test analysis is also demonstrated.
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