Effect of Radial Well Guidance on Hydraulic Fracturing Crack Propagation Mechanism

doi:10.11885/j.issn.1674-5086.2017.10.27.02

Abstract

Abstract: To study the effect of radial well guidance on cracks and understand the pattern of hydraulic fracturing crack propagation, a fluid-solid coupled three-dimensional crack propagation model is constructed based on the extended finite element theory and further used to simulate the hydraulic crack propagation process induced by radial well guidance. In particular, the effect of three factors (radial well azimuthal angle, horizontal stress difference, and radial well radius) on the guidance of hydraulic crack propagation are discussed. The concept of a "guidance factor" is first proposed in this study and used as a quantitative parameter for evaluating the guiding performance of the radial well. The results revealed that the guiding performance in hydraulic crack propagation can be affected by all three factors, including radial well azimuthal angle, horizontal stress difference, and radial well radius. Specifically, a smaller radial well azimuthal angle, a larger horizontal stress difference, and a larger radius for the radial well can enable a strong guiding ability for the radial well and therefore realize a decent guiding performance, and vice versa. Finally, the accuracy of the numerical simulation results is validated by large-scale true triaxial hydraulic fracturing simulation tests.

Key words: crack propagation, radial well, extended finite element, hydraulic fracturing, numerical simulation

CLC Number:

TE355

GONG Diguang, CHEN Junbin, QU Zhanqing, GUO Tiankui. Effect of Radial Well Guidance on Hydraulic Fracturing Crack Propagation Mechanism[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 122-130.

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