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Author:

Wang, Song (Wang, Song.) | Zhou, Jian (Zhou, Jian.) (Scholars:周剑) | Zhang, Luqing (Zhang, Luqing.) | Han, Zhenhua (Han, Zhenhua.) | Kong, Yanlong (Kong, Yanlong.)

Indexed by:

EI Scopus SCIE

Abstract:

Abundant natural fractures (NFs) in hot dry rock (HDR) reservoirs serve as a crucial element in hydraulic fracturing technology and reservoir production. Nevertheless, the interaction mechanism between hydraulic fractures (HFs) and natural fracture networks (NFNs) remains poorly understood. This study combines the novel hydro-grain-based model (hydro-GBM) and discrete fracture network (DFN) model to investigate the effects of insitu stress, fracture number, and fracture length on hydraulic fracturing behaviors in mineral-scale granite with NFNs. Results indicate that as the complexity of NFs increases, the stress shadow effect is amplified during HF propagation, while the spatial arrangement of NFs governs the propagation of secondary paths. Additionally, a downward trend is observed in average activity levels of acoustic emission (AE) events and proportions of large events within NFs and matrix. Damage and activation degrees in both NFs and matrix decrease with an increase in the number of NFs. The inability of main hydraulic paths to propagate over long distances can be attributed to the dispersion of fracturing fluid and the rapid decay of pressure within densely distributed, short NFs. These numerical findings shed light on the process of HFs activating NFNs and provide valuable insights for enhancing heat extraction efficiency in HDR reservoirs.

Keyword:

Natural fracture network Particle flow code Hydraulic fracturing Grain -based model Hot dry rock Fluid -solid coupling algorithm

Author Community:

  • [ 1 ] [Wang, Song]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
  • [ 2 ] [Zhang, Luqing]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
  • [ 3 ] [Han, Zhenhua]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
  • [ 4 ] [Kong, Yanlong]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
  • [ 5 ] [Wang, Song]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 6 ] [Zhou, Jian]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 7 ] [Wang, Song]Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
  • [ 8 ] [Zhang, Luqing]Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
  • [ 9 ] [Kong, Yanlong]Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
  • [ 10 ] [Wang, Song]Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
  • [ 11 ] [Zhang, Luqing]Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
  • [ 12 ] [Han, Zhenhua]Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
  • [ 13 ] [Kong, Yanlong]Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China

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Source :

ENERGY

ISSN: 0360-5442

Year: 2024

Volume: 295

9 . 0 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 17

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

Affiliated Colleges:

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