首页|Coupled THMC model-based prediction of hydraulic fracture geometry and size under self-propping phase-transition fracturing

Coupled THMC model-based prediction of hydraulic fracture geometry and size under self-propping phase-transition fracturing

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The Self-Propping Phase-transition Fracturing Technology(SPFT)represents a novel and environmentally friendly approach for a cost-effective and efficient development of the world's abundant unconventional resources,especially in the context of a carbon-constrained sustainable future.SPFT involves the coupling of Thermal,Hydraulic,Mechanical,and Chemical(THMC)fields,which makes it challenging to understand the mechanism and path of hydraulic fracture propagation.This study addresses these challenges by developing a set of THMC multifield coupling models based on SPFT parameters and the physical/chemical characteristics of the Phase-transition Fracturing Fluid System(PFFS).An algorithm,integrating the Finite Element Method,Discretized Virtual Internal Bonds,and Element Partition Method(FEM-DVIB-EPM),is proposed and validated through a case study.The results demonstrate that the FEM-DVIB-EPM coupling algorithm reduces complexity and enhances solving efficiency.The length of the hydraulic fracture increases with the quantity and displacement of PFFS,and excessive displacement may result in uncontrolled fracture height.Within the parameters considered,a minimal differ-ence in fracture length is observed when the PFFS amount exceeds 130 m3,that means the fracture length tends to stabilize.This study contributes to understanding the hydraulic fracture propagation mechanism induced by SPFT,offering insights for optimizing hydraulic fracturing technology and treatment parameters.

Sustainable development,SelfPropping phaseTransition fracturing technology,ThermalHydraulicMechanicalChemical coupling,FEMDVIBEPM,Hydraulic fracture propagation

Nanlin Zhang、Fushen Liu、Liangliang Jiang、Pinqiang Mo、Jingwen Xiao、Qi Song、Yuhao Luo

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Computing Center for Geotechnical Engineering,College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zijingang,China

Research Center of Coastal and Urban Geotechnical Engineering,College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zijingang,China

Engineering Research Center of Urban Underground Development of Zhejiang Province,Hangzhou 310058,China

Department of Chemical and Petroleum Engineering,University of Calgary,Calgary,AB T2N1N4,Canada

State Key Laboratory of Intelligence Construction and Healthy Operation and Maintenance of Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China

Safety,Environment and Technology Supervision Research Institute,Petro China Southwest Oil and Gas Field Company,Chengdu 610041,China

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2024

10.1007/s40789-024-00727-4

国际煤炭科学技术学报(英文)

国际煤炭科学技术学报(英文)

CSTPCD
ISSN：2095-8293
年,卷(期)：2024.11(6)