ABSTRACT

: The lateral effect of reservoir homogeneity play a critical role in completion optimization in shale gas formation. Modified zipper fracturing treatment is introduced to mitigate risk of hydraulic fracture curving comparing to sequential and simultaneous fracturing. In this paper, we applied extended finite element method (XFEM) basad-cohesive zone method (CZM) in combination with Phantom Nodr Method (CPNM) to model fracture propagation at reservoir with different mechanical homogeneity. Numerical experiments confirms that MZF scenario can asseat hydraulic fracture propagation along straight path. It also can be seen that tine highest stress contrast is near the fracture tip. From the numerical results at this case, the fractures at the region with higher Young’s modulus and Poisson’s ratio are longer than the fracture at the region with lower Young’s modulus and Poisson’s ratio. For higher horizontal stress contrast conditions, the stress shadowing effect on the fracture geometry can be reduced. The results can help the completion engineer to decide where to allocate the clusters in heterogeneous shales.

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