In the last several years, interest in developing unconventional oil and gas reservoirs has grown tremendously. Most of these unconventional reservoirs have very low permeability which makes them unable to produce at economic flow rates without massive stimulation treatments or special recovery processes. Bakken Shale play is one of these reservoirs which horizontal wells with hydraulic fracture treatments have been proven to be an effective method for its development. In this study, to evaluate the performance of hydraulically fractured horizontal wells in the Bakken Shale play, a rigorous analytical model has been developed to predict the productivity of a tight multi-layered reservoir drained by a horizontal well with a longitudinal fracture. This model rigorously couples flow in the matrix to flow in the fracture, and then to flow in the wellbore to account for the fracture conductivity and wellbore hydraulics, respectively.

History matching of production data for Bakken wells reveals that the developed model provides a reliable tool for predicting the productivity of this type of well-reservoir configuration. Moreover, using this model to study the key factors influencing the well performance indicates that length of fractured portion of the lateral is the primary factors affecting the well productivity, while conductivity of fracture has an insignificant effect on productivity, which means using better proppant or fluid has minimal effect on productivity.

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