Modeling interaction between natural fractures and hydraulic fractures in block cave mining

Q. He, F. Suorineni, J. Oh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Hydraulic fracturing has been utilized as a pre-conditioning method in block cave mining to improve cavability and fragmentation sizes in recent years. A successful hydraulic fracturing operation depends largely on the interaction between natural fractures and hydraulic fractures. This process has been extensively studied in the oil & gas industry where hydraulic fractures are commonly vertical planar types. In this case, the effects of natural fracture dip angle and vertical in-situ stress are neglected. However, in block cave mining, hydraulic fractures are generally horizontal radial types. The applicability of the existing conclusions for block cave mining needs to be examined. In this paper, the interaction between natural fractures and horizontal radial hydraulic fractures is investigated by theoretical analysis and numerical modeling. It indicates that both natural fracture dip angle and approach angle influence the interaction result, as well as all the three in-situ stresses. It shows that hydraulic fractures are more likely to cross natural fractures if rock tensile strength is sufficiently low, or the product of flow rate and fluid viscosity is sufficiently high. Rock masses in block cave mining have mixed-qualities. High flow rate and fluid viscosity are recommended in regions where hydraulic fractures are not able to cross natural fractures.

Original languageEnglish
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Pages562-570
Number of pages9
ISBN (Electronic)9781510810518
Publication statusPublished - Jan 1 2015
Externally publishedYes
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: Jun 29 2015Jul 1 2015

Publication series

Name49th US Rock Mechanics / Geomechanics Symposium 2015
Volume1

Conference

Conference49th US Rock Mechanics / Geomechanics Symposium
CountryUnited States
CitySan Francisco
Period6/29/157/1/15

Fingerprint

caves
Caves
hydraulics
cave
Hydraulics
modeling
interactions
in situ stress
dip
Hydraulic fracturing
viscosity
fracturing
fluid
hydraulic fracturing
Hydraulic mining
gas industry
flow velocity
tensile strength
Rocks
Flow rate

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

He, Q., Suorineni, F., & Oh, J. (2015). Modeling interaction between natural fractures and hydraulic fractures in block cave mining. In 49th US Rock Mechanics / Geomechanics Symposium 2015 (pp. 562-570). (49th US Rock Mechanics / Geomechanics Symposium 2015; Vol. 1). American Rock Mechanics Association (ARMA).

Modeling interaction between natural fractures and hydraulic fractures in block cave mining. / He, Q.; Suorineni, F.; Oh, J.

49th US Rock Mechanics / Geomechanics Symposium 2015. American Rock Mechanics Association (ARMA), 2015. p. 562-570 (49th US Rock Mechanics / Geomechanics Symposium 2015; Vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

He, Q, Suorineni, F & Oh, J 2015, Modeling interaction between natural fractures and hydraulic fractures in block cave mining. in 49th US Rock Mechanics / Geomechanics Symposium 2015. 49th US Rock Mechanics / Geomechanics Symposium 2015, vol. 1, American Rock Mechanics Association (ARMA), pp. 562-570, 49th US Rock Mechanics / Geomechanics Symposium, San Francisco, United States, 6/29/15.
He Q, Suorineni F, Oh J. Modeling interaction between natural fractures and hydraulic fractures in block cave mining. In 49th US Rock Mechanics / Geomechanics Symposium 2015. American Rock Mechanics Association (ARMA). 2015. p. 562-570. (49th US Rock Mechanics / Geomechanics Symposium 2015).
He, Q. ; Suorineni, F. ; Oh, J. / Modeling interaction between natural fractures and hydraulic fractures in block cave mining. 49th US Rock Mechanics / Geomechanics Symposium 2015. American Rock Mechanics Association (ARMA), 2015. pp. 562-570 (49th US Rock Mechanics / Geomechanics Symposium 2015).
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