Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions
•Fracturing-induced changes in microfractures were characterized quantitatively.•Permeability changes of microfractures after hydraulic fracturing were calculated.•Hydraulic fracturing increased the anisotropy of microfractures.•Horizontal in-situ stress difference controlled microfracture connectio...
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| Veröffentlicht in: | Fuel (Guildford) 2021-03, Vol.287, p.119566, Article 119566 |
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| creator | Mou, Pengwei Pan, Jienan Wang, Kai Wei, Jiang Yang, Yanhui Wang, Xianglong |
| description | •Fracturing-induced changes in microfractures were characterized quantitatively.•Permeability changes of microfractures after hydraulic fracturing were calculated.•Hydraulic fracturing increased the anisotropy of microfractures.•Horizontal in-situ stress difference controlled microfracture connection.•Permeability increased significantly vertically and parallel to the bedding plane.
The influence of hydraulic fracturing on coal microfractures (10–1000 μm) is an important part of the stimulation mechanism of coalbed methane (CBM) hydraulic fracturing, which is of great significance to improve the productivity of CBM. In this work, high-rank coal samples from Chengzhuang and Sihe Mine were selected for hydraulic fracturing simulation experiments, using stereoscopic microfracture scanning and binarization image processing methods, the mean aperture, surface density, connectivity, mean length and fracture porosity of microfractures were compared and analyzed under different in-situ stress conditions before and after hydraulic fracturing, and the permeability changes were calculated. It is found that hydraulic fracturing could increase the permeability of microfractures in coal seam significantly, and the permeability of microfractures after hydraulic fracturing was 0.43–14.82 times that before fracturing. Hydraulic fracturing did not induce new microfractures, but only the expansion of the original microfractures, which caused the mean aperture, mean length and fracture porosity of microfractures to increase by 39.85%, 47.70% and 115.59%, respectively. Stronger heterogeneity and larger horizontal in-situ stress difference will inhibit the expansion of microfractures. Under the same hydraulic fracturing conditions, there are larger interlayer differences for coal samples with stronger heterogeneity, and hydraulic fracturing will prioritize microfractures in the direction of parallel bedding planes. In addition, the smaller the horizontal in-situ stress difference, the microfractures expand uniformly during hydraulic fracturing, which is more conducive to the connection of microfractures. |
| doi_str_mv | 10.1016/j.fuel.2020.119566 |
| format | Article |
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The influence of hydraulic fracturing on coal microfractures (10–1000 μm) is an important part of the stimulation mechanism of coalbed methane (CBM) hydraulic fracturing, which is of great significance to improve the productivity of CBM. In this work, high-rank coal samples from Chengzhuang and Sihe Mine were selected for hydraulic fracturing simulation experiments, using stereoscopic microfracture scanning and binarization image processing methods, the mean aperture, surface density, connectivity, mean length and fracture porosity of microfractures were compared and analyzed under different in-situ stress conditions before and after hydraulic fracturing, and the permeability changes were calculated. It is found that hydraulic fracturing could increase the permeability of microfractures in coal seam significantly, and the permeability of microfractures after hydraulic fracturing was 0.43–14.82 times that before fracturing. Hydraulic fracturing did not induce new microfractures, but only the expansion of the original microfractures, which caused the mean aperture, mean length and fracture porosity of microfractures to increase by 39.85%, 47.70% and 115.59%, respectively. Stronger heterogeneity and larger horizontal in-situ stress difference will inhibit the expansion of microfractures. Under the same hydraulic fracturing conditions, there are larger interlayer differences for coal samples with stronger heterogeneity, and hydraulic fracturing will prioritize microfractures in the direction of parallel bedding planes. In addition, the smaller the horizontal in-situ stress difference, the microfractures expand uniformly during hydraulic fracturing, which is more conducive to the connection of microfractures.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/j.fuel.2020.119566</identifier><language>eng</language><publisher>OXFORD: Elsevier Ltd</publisher><subject>Apertures ; Bedding ; Coal ; Coal heterogeneity ; Coal mines ; Coal permeability ; Coalbed methane ; Energy & Fuels ; Engineering ; Engineering, Chemical ; Fractures ; Heterogeneity ; Hydraulic fracturing ; Image processing ; In-situ stress ; Interlayers ; Microfracture ; Permeability ; Porosity ; Science & Technology ; Stress ; Technology</subject><ispartof>Fuel (Guildford), 2021-03, Vol.287, p.119566, Article 119566</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Mar 1, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>89</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000604284900005</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-c328t-e537c9be30eb742c237a8f5a9b371ff3bb6887f2d7b57d72b9c416153ab00b273</citedby><cites>FETCH-LOGICAL-c328t-e537c9be30eb742c237a8f5a9b371ff3bb6887f2d7b57d72b9c416153ab00b273</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.fuel.2020.119566$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Mou, Pengwei</creatorcontrib><creatorcontrib>Pan, Jienan</creatorcontrib><creatorcontrib>Wang, Kai</creatorcontrib><creatorcontrib>Wei, Jiang</creatorcontrib><creatorcontrib>Yang, Yanhui</creatorcontrib><creatorcontrib>Wang, Xianglong</creatorcontrib><title>Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions</title><title>Fuel (Guildford)</title><addtitle>FUEL</addtitle><description>•Fracturing-induced changes in microfractures were characterized quantitatively.•Permeability changes of microfractures after hydraulic fracturing were calculated.•Hydraulic fracturing increased the anisotropy of microfractures.•Horizontal in-situ stress difference controlled microfracture connection.•Permeability increased significantly vertically and parallel to the bedding plane.
The influence of hydraulic fracturing on coal microfractures (10–1000 μm) is an important part of the stimulation mechanism of coalbed methane (CBM) hydraulic fracturing, which is of great significance to improve the productivity of CBM. In this work, high-rank coal samples from Chengzhuang and Sihe Mine were selected for hydraulic fracturing simulation experiments, using stereoscopic microfracture scanning and binarization image processing methods, the mean aperture, surface density, connectivity, mean length and fracture porosity of microfractures were compared and analyzed under different in-situ stress conditions before and after hydraulic fracturing, and the permeability changes were calculated. It is found that hydraulic fracturing could increase the permeability of microfractures in coal seam significantly, and the permeability of microfractures after hydraulic fracturing was 0.43–14.82 times that before fracturing. Hydraulic fracturing did not induce new microfractures, but only the expansion of the original microfractures, which caused the mean aperture, mean length and fracture porosity of microfractures to increase by 39.85%, 47.70% and 115.59%, respectively. Stronger heterogeneity and larger horizontal in-situ stress difference will inhibit the expansion of microfractures. Under the same hydraulic fracturing conditions, there are larger interlayer differences for coal samples with stronger heterogeneity, and hydraulic fracturing will prioritize microfractures in the direction of parallel bedding planes. In addition, the smaller the horizontal in-situ stress difference, the microfractures expand uniformly during hydraulic fracturing, which is more conducive to the connection of microfractures.</description><subject>Apertures</subject><subject>Bedding</subject><subject>Coal</subject><subject>Coal heterogeneity</subject><subject>Coal mines</subject><subject>Coal permeability</subject><subject>Coalbed methane</subject><subject>Energy & Fuels</subject><subject>Engineering</subject><subject>Engineering, Chemical</subject><subject>Fractures</subject><subject>Heterogeneity</subject><subject>Hydraulic fracturing</subject><subject>Image processing</subject><subject>In-situ stress</subject><subject>Interlayers</subject><subject>Microfracture</subject><subject>Permeability</subject><subject>Porosity</subject><subject>Science & Technology</subject><subject>Stress</subject><subject>Technology</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>HGBXW</sourceid><recordid>eNqNkM1KJDEUhYOMYI_6Aq4CLodq81NVSYEbaZxRENzoOiSpRNOWSZufEd_eFNW4FFeBy3fuzfkAOMNojRHuL7ZrW8y0JojUAR66vj8AK8wZbRju6C-wQpVqCO3xEfid0hYhxHjXrsDu1tupGK9NgsHC548xyjI5DW2UOpfo_BMMHr46HcN-tCfd03MTpX-BOsgJFj-aCEdnrYnGZ-h8k1wuMOXKp8r40WUXfDoBh1ZOyZzu32Pw-Pf6YXPT3N3_u91c3TWaEp4b01GmB2UoMoq1RBPKJLedHBRl2FqqVM85s2RkqmMjI2rQLe5rV6kQUoTRY3C-7N3F8FZMymIbSvT1pCAtHxAaSDdUiixUrZdSNFbsonuV8UNgJGazYitms2I2KxazNcSX0LtRwSbtZn1fwaq2Ry3hbb2BULdxWc7FN6H4XKN_fh6t9OVCmyrqvzNR7BOji0ZnMQb33T8_AcwEpFw</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Mou, Pengwei</creator><creator>Pan, Jienan</creator><creator>Wang, Kai</creator><creator>Wei, Jiang</creator><creator>Yang, Yanhui</creator><creator>Wang, Xianglong</creator><general>Elsevier Ltd</general><general>Elsevier</general><general>Elsevier BV</general><scope>BLEPL</scope><scope>DTL</scope><scope>HGBXW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7T7</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>P64</scope></search><sort><creationdate>20210301</creationdate><title>Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions</title><author>Mou, Pengwei ; Pan, Jienan ; Wang, Kai ; Wei, Jiang ; Yang, Yanhui ; Wang, Xianglong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-e537c9be30eb742c237a8f5a9b371ff3bb6887f2d7b57d72b9c416153ab00b273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Apertures</topic><topic>Bedding</topic><topic>Coal</topic><topic>Coal heterogeneity</topic><topic>Coal mines</topic><topic>Coal permeability</topic><topic>Coalbed methane</topic><topic>Energy & Fuels</topic><topic>Engineering</topic><topic>Engineering, Chemical</topic><topic>Fractures</topic><topic>Heterogeneity</topic><topic>Hydraulic fracturing</topic><topic>Image processing</topic><topic>In-situ stress</topic><topic>Interlayers</topic><topic>Microfracture</topic><topic>Permeability</topic><topic>Porosity</topic><topic>Science & Technology</topic><topic>Stress</topic><topic>Technology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mou, Pengwei</creatorcontrib><creatorcontrib>Pan, Jienan</creatorcontrib><creatorcontrib>Wang, Kai</creatorcontrib><creatorcontrib>Wei, Jiang</creatorcontrib><creatorcontrib>Yang, Yanhui</creatorcontrib><creatorcontrib>Wang, Xianglong</creatorcontrib><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Web of Science - Science Citation Index Expanded - 2021</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Biotechnology Research Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Computer and Information Systems Abstracts</collection><collection>Corrosion Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Materials Business File</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Copper Technical Reference Library</collection><collection>Materials Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Fuel (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mou, Pengwei</au><au>Pan, Jienan</au><au>Wang, Kai</au><au>Wei, Jiang</au><au>Yang, Yanhui</au><au>Wang, Xianglong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions</atitle><jtitle>Fuel (Guildford)</jtitle><stitle>FUEL</stitle><date>2021-03-01</date><risdate>2021</risdate><volume>287</volume><spage>119566</spage><pages>119566-</pages><artnum>119566</artnum><issn>0016-2361</issn><eissn>1873-7153</eissn><abstract>•Fracturing-induced changes in microfractures were characterized quantitatively.•Permeability changes of microfractures after hydraulic fracturing were calculated.•Hydraulic fracturing increased the anisotropy of microfractures.•Horizontal in-situ stress difference controlled microfracture connection.•Permeability increased significantly vertically and parallel to the bedding plane.
The influence of hydraulic fracturing on coal microfractures (10–1000 μm) is an important part of the stimulation mechanism of coalbed methane (CBM) hydraulic fracturing, which is of great significance to improve the productivity of CBM. In this work, high-rank coal samples from Chengzhuang and Sihe Mine were selected for hydraulic fracturing simulation experiments, using stereoscopic microfracture scanning and binarization image processing methods, the mean aperture, surface density, connectivity, mean length and fracture porosity of microfractures were compared and analyzed under different in-situ stress conditions before and after hydraulic fracturing, and the permeability changes were calculated. It is found that hydraulic fracturing could increase the permeability of microfractures in coal seam significantly, and the permeability of microfractures after hydraulic fracturing was 0.43–14.82 times that before fracturing. Hydraulic fracturing did not induce new microfractures, but only the expansion of the original microfractures, which caused the mean aperture, mean length and fracture porosity of microfractures to increase by 39.85%, 47.70% and 115.59%, respectively. Stronger heterogeneity and larger horizontal in-situ stress difference will inhibit the expansion of microfractures. Under the same hydraulic fracturing conditions, there are larger interlayer differences for coal samples with stronger heterogeneity, and hydraulic fracturing will prioritize microfractures in the direction of parallel bedding planes. In addition, the smaller the horizontal in-situ stress difference, the microfractures expand uniformly during hydraulic fracturing, which is more conducive to the connection of microfractures.</abstract><cop>OXFORD</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.fuel.2020.119566</doi><tpages>12</tpages></addata></record> |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Apertures Bedding Coal Coal heterogeneity Coal mines Coal permeability Coalbed methane Energy & Fuels Engineering Engineering, Chemical Fractures Heterogeneity Hydraulic fracturing Image processing In-situ stress Interlayers Microfracture Permeability Porosity Science & Technology Stress Technology |
| title | Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions |
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