ABSTRACT:

The goal of this study is to explore potential stress shadow patterns associated with hydraulic fracture swarms such as those encountered in the recent stimulated rock volume (SRV) drill-through projects in the Eagle Ford and Midland Basin, TX. Whereas stress shadow modeling typically follows simulation of simplified hydraulic fracture planes, the modeling presented here focuses on morphological complexity similar to what has been observed in the subsurface core and image log data. Conceptual hydraulic fracture swarms are created by merging iterative variants of modeled hydraulic fractures. Then a proprietary boundary element modeling code based on the triangular elastic dislocation method is used to simulate stress perturbation effects due to pressurization of the fracture network. Internal pressure in the fractures is modeled as a crack-normal dislocation with a smooth aperture decay function. The wide range of stress shadow results complement subsurface data (e.g., distributed acoustic sensing - DAS, time-lapse microseismic, and downhole pressure gauges, etc.) that reveal pressure interference during stimulation and depletion to be non-uniform, dynamic, and difficult to predict using deterministic approaches.

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