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Abstract

Several common reservoir production conditions result in flow at a constant pressure; then, a constantly changing well-flowing pressure is recorded. Nowadays, most well-test analysis methods assume constant-rate production especially since gas shale wells are normally tested by recording the flow rate values under constant pressure conditions. In such cases, well testing could be eliminated in many cases as being of little value or economically unjustifiable because of the resulting production loss when compared with what can be obtained from constant wellbore pressure production data. Then, this paper presents a transient-rate analysis for artificially fractured vertical wells flowing under constant pressure in homogenous deposits with circular/square shape. Expressions for reservoir characterization using both TDS and conventional techniques are introduced and successfully tested with field and synthetic examples.