Abstract

The development of fields located in the Colombian Foothills face important challenges related to fluid compositional character, highly heterogeneous and stressed tectonic environments. Complex and high cost operations make well productivity maximization a key component for an optimal reservoir management strategy. Based on this high risk scenario and on the uncertainties related to complex geological heterogeneities, a coupled simulation excercise has been performed in order to estimate the best engineering solution that allows completing and producing future wells under the optimal scenario of initial and sustained productivity, operational flexibility and mitigation of investment risk.

The study herein presented includes a complete sensitivity analysis and uncertainty assessment of four different well completion schemes for production: a single vertical well, a vertical hydraulically fractured well and two multilateral wells, one with one producing branch and other with two producing branches. In all cases, a non-linear hypoelastic constitutive model was fully coupled to the reservoir simulator and permeability changes were included based on its dependence on the mean effective stress.

Results suggests that geomechanics effects can lead to significant variations in final recovery depending on completion scheme. This input becomes now critical for final well designs specially in naturally fractured - highly anisotropic zones in which conventional approaches have led to rapid water encroachment and/or near wellbore permeability reduction due to increased effective stress.

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