TY - JOUR
T1 - Shore hardness measurements of sub-bituminous coal microlithotypes
AU - Barbosa, Karina
AU - Esterle, Joan
AU - Van De Wetering, Nikola
AU - Chen, Zhongwei
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/2
Y1 - 2020/1/2
N2 - This paper presents the results of the surface hardness of coal, estimated with the Shore Scleroscope Rebound Hardness tester. The Shore hardness can be related to fracture toughness and tensile strength, which are important input parameters for fracture stimulation design of coal seam gas reservoirs. The Shore hardness experiments were performed on low rank coal specimens from an open cut mine from the Surat-Clarence-Moreton Basin, and a borehole from the Surat Basin, Australia. All measurements were conducted on polished coal surface confined within epoxy blocks following similar preparation required for coal petrographic analyses. The resulting indentations and microlithotypes were analysed under the microscope, then associated to the Shore hardness number. Three common microlithotypes were identified for the sub-bituminous specimens tested: vitrite, clarite and carbominerite. Results indicate the hardest microlithotype is clarite, followed by vitrite, and then carbominerite. Quantification of the micromechanical properties is possible using simple Shore hardness tests, and opportunities to improve fracture propagation may be further explored from this work.
AB - This paper presents the results of the surface hardness of coal, estimated with the Shore Scleroscope Rebound Hardness tester. The Shore hardness can be related to fracture toughness and tensile strength, which are important input parameters for fracture stimulation design of coal seam gas reservoirs. The Shore hardness experiments were performed on low rank coal specimens from an open cut mine from the Surat-Clarence-Moreton Basin, and a borehole from the Surat Basin, Australia. All measurements were conducted on polished coal surface confined within epoxy blocks following similar preparation required for coal petrographic analyses. The resulting indentations and microlithotypes were analysed under the microscope, then associated to the Shore hardness number. Three common microlithotypes were identified for the sub-bituminous specimens tested: vitrite, clarite and carbominerite. Results indicate the hardest microlithotype is clarite, followed by vitrite, and then carbominerite. Quantification of the micromechanical properties is possible using simple Shore hardness tests, and opportunities to improve fracture propagation may be further explored from this work.
KW - Coal microlithotype
KW - Fracture propagation
KW - Mechanical properties
KW - Scleroscope
UR - http://www.scopus.com/inward/record.url?scp=85075088278&partnerID=8YFLogxK
U2 - 10.1016/j.coal.2019.103341
DO - 10.1016/j.coal.2019.103341
M3 - 文章
AN - SCOPUS:85075088278
SN - 0166-5162
VL - 217
JO - International Journal of Coal Geology
JF - International Journal of Coal Geology
M1 - 103341
ER -