This paper presents a new approach to forecast the behaviour of an acid-fractured well by numerical simulation. Unlike the known conventional methods, the present technique applies the "Dual-Porosity System" theory.

Several wells were individually modeled successfully using their production history and all the pre-fracture and post-fracture pressure buildup tests in a single continuous run.

The forecasted pressures and oil rates were in good agreement with their actual values. Also, the fracture lengths imposed to match the post-frac history showed good agreement with the values derived from test analyses. This method, thus, provides a viable predictive tool and a means to support the well test interpretation results by respecting more precisely, as we believe, the flow pattern in the vicinity of the wellbore and within the fractured medium.

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