Abstract

Re-fracturing has been suggested to address the rapid decline of oil production in the Bakken Formation. Creating new fractures between the pre-existing ones allows access to the unstimulated reserves and consequently increases production. This study aims to optimize the completion design parameters of the Re-fracturing in the Bakken formation. A numerical model was built using a physics-based simulator that combines hydraulic fracturing, geomechanics, and reservoir numerical modeling as a continuous simulation. The study conducted sensitivity analyses to evaluate the effect of different completion parameters on the re-fractured well performance, including the time between the initial fracture stimulation and re-fracturing, the injection volume of the re-fracturing fluid, and the design of the re-fracturing treatment to achieve better oil production performances. The study found that the re-fracturing operations can lead to promising results, with a significant increase in the incremental oil recovery. Overall, the outcomes of this study provide valuable insights for optimizing re-fracturing operations in the Bakken formation and similar unconventional reservoirs. It shows how the depleted zone affects the propagation of new fractures beyond the depleted area. As a result of this study, higher injection volumes with moderate fracture spacing and shorter time before refracturing resulted in a better performance.

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