The unconventional reservoir engineer is required to evaluate increasingly complex data. In additional to the rapid advancement of technology used to complete and stimulate unconventional resources, there has been a proliferation of type curve procedures (i.e. pressure and rate transient analysis), decline techniques, and reservoir modelling strategies in the literature. Specific challenges are the analysis of single and multi-phase flow form hydraulically stimulated horizontal and multi-lateral wells. Although state of the art simulation techniques can be used to model any complex reservoir and well architecture, restrictions on data quality, project schedules, and budgets do not always allow for detailed simulation and analysis. Furthermore, initialization of the numerical model often requires some form of analytical modelling as a precursor to the larger model.

However, complex scenarios production analysis or forecasting of horizontal wells, dual and tri-laterals, fracture horizontals as well heterogeneous reservoirs can be simplified by using an proxy model which is accurate (if not exact) with respect to long-term deliverability and resource/reserve estimation. Complex wells and reservoirs can be modelled and analyzed by using a simple homogenous reservoir with effective permeability, skin, and wellbore radius combinations. Examples will demonstrate this procedure would allow for the use of simple analytical software tools in lieu of simulation, or the generation of reliable forecasts in the absence of completion/reservoir data

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