Abstract

In 2014, more than 30,000 wells will be drilled in different unconventional plays across the US. As drilling density increases, chances are these new wells will be located in the vicinity of a producing unit. When the new well is being completed, the pressure depletion around the producing well affects the principal stress regime, creating low stress compartments that attract the majority of the slurry injected. This condition has been studied in the past for vertical wells and results confirmed that the asymmetric propagation of the fracture wings leaves vast sections of the reservoir un-stimulated affecting well performance. This study uses a dataset from the Williston basin to evaluate the impact of this condition in modern horizontal completions. Pore pressure maps from single well models are used to build a multi-well geomechanical model, a numerical fracture simulator is used to understand fracture geometry and quantify wing asymmetry and a multi-well production model is created to estimate the impact in ultimate recovery. Finally, this paper concludes with a series of recommendations regarding completion design and production strategy that can reduce the severity of fracture asymmetry and increase EUR.

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