Evaluating the stability and volumetric flowback rate of proppant packs in hydraulic fractures using the lattice Boltzmann-discrete element coupling method

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外文摘要：The stability and mobility of proppant packs in hydraulic fractures during hydrocarbon production are numerically investigated by the lattice Boltzmann-discrete element coupling method(LB-DEM).This study starts with a preliminary proppant settling test,from which a solid volume fraction of 0.575 is calibrated for the proppant pack in the fracture.In the established workflow to investigate proppant flowback,a displacement is applied to the fracture surfaces to compact the generated proppant pack as well as further mimicking proppant embedment under closure stress.When a pressure gradient is applied to drive the fluid-particle flow,a critical aperture-to-diameter ratio of 4 is observed,above which the proppant pack would collapse.The results also show that the volumetric proppant flowback rate increases quadratically with the fracture aperture,while a linear variation between the particle flux and the pressure gradient is exhibited for a fixed fracture aperture.The research outcome contributes to-wards an improved understanding of proppant flowback in hydraulic fractures,which also supports an optimised proppant size selection for hydraulic fracturing operations.

外文关键词：

Numerical simulationHydraulic fracturingProppant flowbackClosure stressParticulate flow

作者：

Duo Wang、Sanbai Li、Rui Wang、Binhui Li、Zhejun Pan

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作者单位：

National Key Laboratory of Continental Shale Oil,Northeast Petroleum University,Daqing,163318,China

Institute of Unconventional Oil &Gas,Northeast Petroleum University,Daqing,163318,China

School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

National Center for Applied Mathematics Shenzhen(NCAMS),Southern University of Science and Technology,Shenzhen,518055,China

National Key Laboratory of Continental Shale Oil,Daqing Oilfield of CNPC,Daqing,163002,China

Daqing Oilfield Exploration and Development Research Institute,Daqing,Heilongjiang,163712,China

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基金：

Heilongjiang"Open Competition"project国家自然科学基金国家自然科学基金Northeast Petroleum University and Guangdong Basic and Applied Basic Research FoundationHeilongjiang Touyan Innovation Team Program

项目编号：

DQYT2022-JS-7585230402552174025

出版年：

2024

DOI：

10.1016/j.jrmge.2023.11.008

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(6)