A Prediction Method for the Initiation Pressure of Pre-CO 2 Fracturing Considering the Modification of Rock Mechanical Parameters after CO 2 Treatment

A Prediction Method for the Initiation Pressure of Pre-CO 2 Fracturing Considering the Modification of Rock Mechanical Parameters after CO 2 Treatment | 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 A Prediction Method for the Initiation Pressure of Pre-CO 2 Fracturing Considering the Modification of Rock Mechanical Parameters after CO 2 Treatment Cuilong Kong, Yuxue Sun, Jianguang Wei, Guo Li, Ying Yang, Chao Tang, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4480003/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The utilization of CO 2 fracturing fluid presents a notable reduction in the challenges associated with reservoir opening, particularly in dense and unconventional reservoirs. The widespread adoption of this technique underscores its efficacy. The establishment of a more realistic CO 2 fracturing model serves to elucidate the intricate mechanisms underlying CO 2 fracturing transformation. Additionally, it furnishes a foundational framework for devising comprehensive fracturing construction plans. However, current research has neglected to consider the influence of CO 2 on rock properties during CO 2 fracturing, resulting in an inability to precisely replicate the alterations in the reservoir post-CO 2 injection into the formation. This disparity from the actual conditions poses a substantial limitation to the application and advancement of CO 2 fracturing technology. This work integrates the variations in physical parameters of rocks after complete contact and reaction with CO 2 into the numerical model of crack propagation. This comprehensive approach fully acknowledges the impact of pre-CO 2 exposure on the mechanical parameters of reservoir rocks. Consequently, it authentically restores the reservoir state following CO 2 injection, ensuring a more accurate representation of the post-fracturing conditions. The research findings reveal that post-CO 2 treatment, the elastic modulus of reservoir shale experiences a reduction of 12.5%, Poisson's ratio decreases by 11.8%, tensile strength decreases by 7.9%, permeability increased by 180%. Additionally, the pre-injection of CO 2 into the reservoir induces a notable increase in pore pressure in the near wellbore zone. In comparison with conventional numerical simulation methods, the approach outlined in this paper yields a reduction in the error associated with predicting fracturing pressure by 9.8%. The model and methodology presented herein serve as a practical tool for accurately forecasting the initiation pressure of CO 2 fracturing. Earth and environmental sciences/Solid earth sciences/Petrology Physical sciences/Energy science and technology/Fossil fuels/Petrol Physical sciences/Energy science and technology/Carbon capture and storage Rock Mechanical Properties Pre-CO2 Fracturing Extended Finite Element Method Initiation Pressure Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted 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. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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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-4480003","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":312198518,"identity":"35761da7-b26e-49fe-bdf7-5c6dee6e41a4","order_by":0,"name":"Cuilong Kong","email":"","orcid":"","institution":"Northeast Petroleum University","correspondingAuthor":false,"prefix":"","firstName":"Cuilong","middleName":"","lastName":"Kong","suffix":""},{"id":312198519,"identity":"984a3a6c-556a-491e-be73-b99380754319","order_by":1,"name":"Yuxue Sun","email":"","orcid":"","institution":"Northeast Petroleum 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Pressure","lastPublishedDoi":"10.21203/rs.3.rs-4480003/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4480003/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe utilization of CO\u003csub\u003e2\u003c/sub\u003e fracturing fluid presents a notable reduction in the challenges associated with reservoir opening, particularly in dense and unconventional reservoirs. The widespread adoption of this technique underscores its efficacy. The establishment of a more realistic CO\u003csub\u003e2\u003c/sub\u003e fracturing model serves to elucidate the intricate mechanisms underlying CO\u003csub\u003e2\u003c/sub\u003e fracturing transformation. Additionally, it furnishes a foundational framework for devising comprehensive fracturing construction plans. However, current research has neglected to consider the influence of CO\u003csub\u003e2\u003c/sub\u003e on rock properties during CO\u003csub\u003e2\u003c/sub\u003e fracturing, resulting in an inability to precisely replicate the alterations in the reservoir post-CO\u003csub\u003e2\u003c/sub\u003e injection into the formation. This disparity from the actual conditions poses a substantial limitation to the application and advancement of CO\u003csub\u003e2\u003c/sub\u003e fracturing technology. This work integrates the variations in physical parameters of rocks after complete contact and reaction with CO\u003csub\u003e2\u003c/sub\u003e into the numerical model of crack propagation. This comprehensive approach fully acknowledges the impact of pre-CO\u003csub\u003e2\u003c/sub\u003e exposure on the mechanical parameters of reservoir rocks. Consequently, it authentically restores the reservoir state following CO\u003csub\u003e2\u003c/sub\u003e injection, ensuring a more accurate representation of the post-fracturing conditions. The research findings reveal that post-CO\u003csub\u003e2\u003c/sub\u003e treatment, the elastic modulus of reservoir shale experiences a reduction of 12.5%, Poisson's ratio decreases by 11.8%, tensile strength decreases by 7.9%, permeability increased by 180%. Additionally, the pre-injection of CO\u003csub\u003e2\u003c/sub\u003e into the reservoir induces a notable increase in pore pressure in the near wellbore zone. 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