Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing

Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing Chaojun Fan, Hao Sun, Lei Yang, Mingkun Luo, Bin Xiao, Lei Wang, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3829513/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 Oct, 2024 Read the published version in Scientific Reports → Version 1 posted 13 You are reading this latest preprint version Abstract The controlled shock wave (CSW) fracturing is an effective method for enhancing permeability of coal seam to promote gas extraction. Based on Fick's law, Darcy's law, the ideal gas law and the Langmuir equation, a damage-seepage-deformation coupling mathematical model of CSW fracturing in coal seam combined with the maximum tensile stress and the Mohr-Coulomb criterion is established. This model is implemented into COMSOL Multiphysics to simulate the coal seam CSW fracturing and subsequent gas extraction. When the shock wave and isotropic in-situ stress are applied on the borehole wall, the coal damage zone is an annular shape, and the permeability in the damage zone increases sharply. The CSW can effectively increase the efficiency of gas extraction and reduce the gas pressure and gas content in coal seam. With the increase of CSW action times, the damage in coal mass reaches a threshold and tends to be stable after several shocks. The damage area and the gas extraction efficiency are positively correlated with the shock intensity. Under the anisotropic ground stress, the larger diversity of the stress in different directions is, the more obvious damage extension in the fractured coal along the maximum stress direction is. Ground stress can inhibit the extension of cracks in the CSW fractured coal seam. This inhibition effect becomes more obvious with the increase of in-situ stress. Physical sciences/Energy science and technology/Fossil fuels Earth and environmental sciences/Solid earth sciences/Petrology Controllable shock wave Low permeability coal seam Gas extraction Permeability enhancement Numerical simulation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 15 Oct, 2024 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 26 Aug, 2024 Reviews received at journal 25 Aug, 2024 Reviewers agreed at journal 13 Aug, 2024 Reviewers agreed at journal 16 Jul, 2024 Reviews received at journal 11 Mar, 2024 Reviewers agreed at journal 08 Mar, 2024 Reviewers agreed at journal 24 Feb, 2024 Reviewers agreed at journal 24 Feb, 2024 Reviewers invited by journal 24 Feb, 2024 Editor assigned by journal 22 Feb, 2024 Editor invited by journal 11 Jan, 2024 Submission checks completed at journal 03 Jan, 2024 First submitted to journal 02 Jan, 2024 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-3829513","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":265019093,"identity":"16b1dbb3-3a79-45ae-a430-95bec86c3784","order_by":0,"name":"Chaojun Fan","email":"","orcid":"","institution":"Liaoning Technical University","correspondingAuthor":false,"prefix":"","firstName":"Chaojun","middleName":"","lastName":"Fan","suffix":""},{"id":265019094,"identity":"d7d83077-bd70-4ae9-a239-a9cf921dc415","order_by":1,"name":"Hao Sun","email":"","orcid":"","institution":"Liaoning Technical 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permeability coal seam, Gas extraction, Permeability enhancement, Numerical simulation","lastPublishedDoi":"10.21203/rs.3.rs-3829513/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-3829513/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe controlled shock wave (CSW) fracturing is an effective method for enhancing permeability of coal seam to promote gas extraction. Based on Fick's law, Darcy's law, the ideal gas law and the Langmuir equation, a damage-seepage-deformation coupling mathematical model of CSW fracturing in coal seam combined with the maximum tensile stress and the Mohr-Coulomb criterion is established. This model is implemented into COMSOL Multiphysics to simulate the coal seam CSW fracturing and subsequent gas extraction. When the shock wave and isotropic in-situ stress are applied on the borehole wall, the coal damage zone is an annular shape, and the permeability in the damage zone increases sharply. The CSW can effectively increase the efficiency of gas extraction and reduce the gas pressure and gas content in coal seam. With the increase of CSW action times, the damage in coal mass reaches a threshold and tends to be stable after several shocks. The damage area and the gas extraction efficiency are positively correlated with the shock intensity. Under the anisotropic ground stress, the larger diversity of the stress in different directions is, the more obvious damage extension in the fractured coal along the maximum stress direction is. Ground stress can inhibit the extension of cracks in the CSW fractured coal seam. This inhibition effect becomes more obvious with the increase of in-situ stress.\u003c/p\u003e","manuscriptTitle":"Modelling of enhanced gas extraction in low permeability coal seam by controllable shock wave fracturing","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-01-05 05:52:39","doi":"10.21203/rs.3.rs-3829513/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2024-08-26T08:00:13+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-08-25T10:32:08+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"283126732806261317603567580274478827586","date":"2024-08-13T14:03:07+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"291216738988457912692548841032297775564","date":"2024-07-16T08:04:07+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-03-11T07:24:03+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"3577208a-c941-49ca-93b6-b8f4e27260b8","date":"2024-03-08T09:24:49+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"9bdea551-0558-4509-a0be-ce913b263812","date":"2024-02-24T10:12:42+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"554d8025-7850-4a74-a724-d8e32560e936","date":"2024-02-24T09:49:03+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2024-02-24T07:09:45+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2024-02-22T08:49:03+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2024-01-11T07:55:40+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2024-01-03T15:30:16+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2024-01-02T12:34:08+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"2785a3ef-948b-49fe-89fb-073b5e3e3cba","owner":[],"postedDate":"January 5th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":27930864,"name":"Physical sciences/Energy science and technology/Fossil fuels"},{"id":27930865,"name":"Earth and environmental sciences/Solid earth sciences/Petrology"}],"tags":[],"updatedAt":"2024-10-21T15:59:06+00:00","versionOfRecord":{"articleIdentity":"rs-3829513","link":"https://doi.org/10.1038/s41598-024-74259-x","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2024-10-15 15:56:51","publishedOnDateReadable":"October 15th, 2024"},"versionCreatedAt":"2024-01-05 05:52:39","video":"","vorDoi":"10.1038/s41598-024-74259-x","vorDoiUrl":"https://doi.org/10.1038/s41598-024-74259-x","workflowStages":[]},"version":"v1","identity":"rs-3829513","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-3829513","identity":"rs-3829513","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}