Numerical Simulation of Seepage in Shale Oil Reservoirs Under Hydraulic Fracturing: From Core-Scale Experiment to Reservoir-Scale Modeling

Yanfang Gao (), Di Wang (), Zupeng Chen, Yanchao Li, Shijie Shen, Dengke Li, Xuelin Liang and Zhi Huang
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Yanfang Gao: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
Di Wang: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
Zupeng Chen: Department of Geology, Northwest University, Xi’an 710069, China
Yanchao Li: Department of Geology, Northwest University, Xi’an 710069, China
Shijie Shen: Department of Geology, Northwest University, Xi’an 710069, China
Dengke Li: Department of Geology, Northwest University, Xi’an 710069, China
Xuelin Liang: Department of Geology, Northwest University, Xi’an 710069, China
Zhi Huang: Department of Geology, Northwest University, Xi’an 710069, China

Energies, 2024, vol. 17, issue 22, 1-25

Abstract: In this study, finite element software was used to simulate seepage at the core scale, the stress sensitivity of the shale core of the stripe layer and fractures was evaluated, and the production optimization design of reservoir C in block B of the oilfield under different fracturing parameters and wellbore parameters was simulated. The coupled finite element model of reservoir seepage stress was established; the pore elasticity model was used to determine the reservoir deformation; the seepage followed Forchheimer’s law and Darcy’s law; and finally, the liquid production was calculated to optimize the production plan. The results showed that the permeability under the same stress conditions increased nonlinearly with the increase in the striatal angle at the core scale, the permeability under the same effective stress conditions decreased gradually with the increase in the shale/fringe thickness ratio, and the elastic modulus and Poisson’s ratio of the proppant decreased. The permeability stress sensitivity was stronger. In the reservoir-scale model, the production pressure difference was the most significant factor affecting shale oil production, followed by the number of fractures and the length of the horizontal zone wellbore, and the elastic modulus of the proppant and Poisson’s ratio had the least impact on production.

Keywords: shale oil reservoirs; finite elements; numerical simulation; stress sensitivity; cracks (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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