AI Chat Paper
Note: Please note that the following content is generated by AMiner AI. SciOpen does not take any responsibility related to this content.
{{lang === 'zh_CN' ? '文章概述' : 'Summary'}}
{{lang === 'en_US' ? '中' : 'Eng'}}
Chat more with AI
Powered by AMiner. Clicking this button will take you away from SciOpen.
Home Petroleum Science Article
PDF (2.9 MB)
Cite
EndNote(RIS) BibTeX
Collect
Submit Manuscript AI Chat Paper
Show Outline
Outline
Show full outline
Hide outline
Outline
Show full outline
Hide outline
Original Paper | Open Access

In-situ laboratory study on influencing factors of pre-SC-CO2 hybrid fracturing effect in shale oil reservoirs

Yu-Xi Zanga, Hai-Zhu Wanga, Bin Wanga, Yong-Gang Yic, Tian-Yu Wanga, Ming-Liang Shia, Gang-Hua Tiana, Shou-Ceng Tiana,b( )
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
College of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay, 834000, Xinjiang, China
Engineering Technology Research Institute of Xinjiang Oilfield Company, Karamay, 834000, Xinjiang, China

Edited by Jia-Jia Fei and Min Li

Show Author Information

Abstract

Supercritical CO2 (SC-CO2) fracturing, being a waterless fracturing technology, has garnered increasing attention in the shale oil reservoir exploitation industry. Recently, a novel pre-SC-CO2 hybrid fracturing method has been proposed, which combines the advantages of SC-CO2 fracturing and hydraulic fracturing. However, the specific impacts of different pre–SC-CO2 injection conditions on the physical parameters, mechanical properties, and crack propagation behavior of shale reservoirs remain unclear. In this study, we utilize a newly developed “pre-SC-CO2 injection → water-based fracturing” integrated experimental device. Through experimentation under in-situ conditions, the impact of pre-SC-CO2 injection displacement and volume on the shale mineral composition, mechanical parameters, and fracture propagation behavior are investigated. The findings of the study demonstrate that the pre-injection SC-CO2 leads to a reduction in clay and carbonate mineral content, while increasing the quartz content. The correlation between quartz content and SC-CO2 injection volume is positive, while a negative correlation is observed with injection displacement. The elastic modulus and compressive strength exhibit a declining trend, while Poisson's ratio shows an increasing trend. The weakening of shale mechanics caused by pre-injection of SC-CO2 is positively correlated with the injection displacement and volume. Additionally, pre-injection of SC-CO2 enhances the plastic deformation behavior of shale, and its breakdown pressure is 16.6% lower than that of hydraulic fracturing. The breakdown pressure demonstrates a non-linear downward trend with the gradual increase of pre-SC-CO2 injection parameters. Unlike hydraulic fracturing, which typically generates primary fractures along the direction of the maximum principal stress, pre-SC-CO2 hybrid fracturing leads to a more complex fracture network. With increasing pre-SC-CO2 injection displacement, intersecting double Y-shaped complex fractures are formed along the vertical axis. On the other hand, increasing the injection rate generates secondary fractures along the direction of non-principal stress. The insights gained from this study are valuable for guiding the design of preSC-CO2 hybrid fracturing in shale oil reservoirs.

Keywords

Pre-CO2 hybrid fracturingFracture propagationFracture patternShale oil reservoir

References

 

Ao, X., Qi, Z., Xiang, Z., et al., 2020. Swelling of shales by supercritical carbon dioxide and its relationship to sorption. ACS Omega 5 (31), 19606-19614. https://doi.org/10.1021/acsomega.0c02118.
Crossref Google Scholar
 

Chen, K., Liu, X., Wang, L., et al., 2021. Influence of sequestered supercritical CO2 treatment on the pore size distribution of coal across the rank range. Fuel 306, 121708. https://doi.org/10.1016/j.fuel.2021.121708.
Crossref Google Scholar
 

Esteves, A.F., Santos, F.M., Pires, J.C.M., 2019. Carbon dioxide as geothermal working fluid: an overview. Renew. Sustain. Energy Rev. 114, 109331. https://doi.org/10.1016/j.rser.2019.109331.
Crossref Google Scholar
 

Fatah, A., Mahmud, H.B., Bennour, Z., et al., 2021. Effect of supercritical CO2 treatment on physical properties and functional groups of shales. Fuel 303, 121310. https://doi.org/10.1016/j.fuel.2021.121310.
Crossref Google Scholar
 

Hu, S., Zhao, W., Hou, L., et al., 2020. Development potential and technical strategy of continental shale oil in China. Petrol. Explor. Dev. 47 (4), 877-887. https://doi.org/10.1016/S1876-3804(20)60103-3.
Crossref Google Scholar
 

Isaka, B.A., Ranjith, P., Rathnaweera, T., 2019. The use of super-critical carbon dioxide as the working fluid in enhanced geothermal systems (EGSs): a review study. Sustain. Energy Technol. Assessments 36, 100547. https://doi.org/10.1016/j.seta.2019.100547.
Crossref Google Scholar
 
Kurowski, P., 2013. Engineering Analysis with SolidWorks Simulation 2013. SDC publications.
 

Lampe, D.J., Stolz, J.F., 2015. Current perspectives on unconventional shale gas extraction in the Appalachian Basin. J. Environ. Sci. Health, Part A 50 (5), 434-446. https://doi.org/10.1080/10934529.2015.992653.
Crossref Google Scholar
 

Li, L., Chen, Z., Su, Y.L., et al., 2021. Experimental investigation on enhanced-oil-recovery mechanisms of using supercritical carbon dioxide as prefracturing energized fluid in tight oil reservoir. SPE J. 26 (5), 3300-3315. https://doi.org/10.2118/202279-PA.
Crossref Google Scholar
 

Li, H., Jiang, X., Xu, Z., et al., 2022. The effect of supercritical CO2 on failure mechanisms of hot dry rock. Adv. Geo-Energy Res. https://doi.org/10.46690/ager.2022.04.07.
Crossref Google Scholar
 

Li, X., Wu, C., Zhao, S., et al., 2020. Technology for cementing shale oil reservoirs in Dagang Oilfield: study and application. Drill. Fluid Complet. Fluid 37 (2), 232-238. https://doi.org/10.3969/i.issn.1001-5620.2020.02.017.
Crossref Google Scholar
 

Liu, G., Pang, F., Chen, Z., 2000. Similarity criterion in hydraulic fracturing simulation experiments. J. Univ. Pet., China (Ed. Nat. Sci.) 24 (5), 45-48.
Crossref Google Scholar
 

Lu, Y., Chen, X., Tang, J., et al., 2019. Relationship between pore structure and mechanical properties of shale on supercritical carbon dioxide saturation. Energy 172, 270-285. https://doi.org/10.1016/j.energy.2019.01.063.
Crossref Google Scholar
 

Lu, Y., Liu, J., Tang, J., et al., 2022. Pore changes of slickwater-containing shale under supercritical CO2 treatment. Fuel 312, 122775. https://doi.org/10.1016/j.fuel.2021.122775.
Crossref Google Scholar
 

Memon, S., Feng, R., Ali, M., et al., 2022. Supercritical CO2-Shale interaction induced natural fracture closure: implications for scCO2 hydraulic fracturing in shales. Fuel 313, 122682. https://doi.org/10.1016/j.fuel.2021.122682.
Crossref Google Scholar
 

Middleton, R.S., Carey, J.W., Currier, R.P., et al., 2015. Shale gas and non-aqueous fracturing fluids: opportunities and challenges for supercritical CO2. Appl. Energy 147, 500-509. https://doi.org/10.1016/j.apenergy.2015.03.023.
Crossref Google Scholar
 

Mojid, M.R., Negash, B.M., Abdulelah, H., et al., 2021. A state-of-art review on waterless gas shale fracturing technologies. J. Petrol. Sci. Eng. 196, 108048. https://doi.org/10.1016/j.petrol.2020.108048.
Crossref Google Scholar
 

Pan, Y., Hui, D., Luo, P., et al., 2018. Experimental investigation of the geochemical interactions between supercritical CO2 and shale: implications for CO2 storage in gas-bearing shale formations. Energy Fuel. 32 (2), 1963-1978. https://doi.org/10.1021/acs.energyfuels.7b03074.
Crossref Google Scholar
 

Qin, L., Zhai, C., Liu, S., et al., 2016. Failure mechanism of coal after cryogenic freezing with cyclic liquid nitrogen and its influences on coalbed methane exploitation. Energy Fuel. 30 (10), 8567-8578. https://doi.org/10.1021/acs.energyfuels.6b01576.
Crossref Google Scholar
 

Ribeiro, L., Thoma, A., Bryant, J., et al., 2022. Lessons learned from the large-scale CO2 stimulation of 11 unconventional wells in the Williston Basin: a practical review of operations, logistics, production uplift, and CO2 storage. SPE Prod. Oper. 37 (4), 698-709. https://doi.org/10.2118/209159-PA.
Crossref Google Scholar
 
Roylance, D., 2001. Stress-strain Curves. Massachusetts Institute of Technology study, Cambridge.
 

Su, E., Liang, Y., Chang, X., et al., 2020. Effects of cyclic saturation of supercritical CO2 on the pore structures and mechanical properties of bituminous coal: an experimental study. J. CO 40, 101208. https://doi.org/10.1016/j.jcou.2020.101208.
Crossref Google Scholar
 
Sun, Z., Wang, H., Song, L., 2020. A case study of hydraulic fracturing in ordos shale under the combined use of CO2 and gelled fluid. In: SPE/AAPG/SEG Unconventional Resources Technology Conference. URTEC. Virtual. https://doi.org/10.15530/urtec-2020-2457.
Crossref
 

Tian, F., Liu, X., Zhang, S., et al., 2021. Continuous sand fracturing technology with slick water for continental shale oil in the Dagang Oilfield. Petrol. Drill. Tech. 49 (4), 118-124. https://doi.org/10.11911/syztjs.2021021.
Crossref Google Scholar
 

Wang, H., Li, G., He, Z., et al., 2018. Experimental investigation on abrasive supercritical CO2 jet perforation. J. CO 28, 59-65. https://doi.org/10.1016/j.jcou.2018.09.018.
Crossref Google Scholar
 

Wang, H., Li, G., Zheng, Y., et al., 2020. Research status and prospects of supercritical CO2 fracturing technology. Acta Pet. Sin. 41 (1), 116. https://doi.org/10.7623/syxb202001011.
Crossref Google Scholar
 

Wang, X., Li, J., Jiang, W., et al., 2022. Characteristics, current exploration practices, and prospects of continental shale oil in China. Adv. Geo-Energy Res. 6 (6), 454-459. https://doi.org/10.46690/ager.2022.06.02.
Crossref Google Scholar
 

Warpinski, N.R., Mayerhofer, M.J., Vincent, M.C., et al., 2009. Stimulating unconventional reservoirs: maximizing network growth while optimizing fracture conductivity. J. Can. Petrol. Technol. 48 (10), 39-51. https://doi.org/10.2118/114173-PA.
Crossref Google Scholar
 

Wu, Y., Tao, J., Wang, J., et al., 2021. Experimental investigation of shale breakdown pressure under liquid nitrogen pre-conditioning before nitrogen fracturing. Int. J. Min. Sci. Technol. 31 (4), 611-620. https://doi.org/10.1016/j.ijmst.2021.05.006.
Crossref Google Scholar
 

Xiao, Y., Li, Z., Wang, J., et al., 2022. Study on enhancing shale oil recovery by CO2 Pre-Pad energized fracturing in A83 block, ordos basin. Atmosphere 13 (9), 1509. https://doi.org/10.3390/atmos13091509.
Crossref Google Scholar
 

Yang, K., Zhou, J., Xian, X., et al., 2023. Effect of supercritical CO2-water-shale interaction on mechanical properties of shale and its implication for carbon sequestration. Gas Sci. Eng. 111, 204930. https://doi.org/10.1016/j.jgsce.2023.204930.
Crossref Google Scholar
 

Yi, Y., Huang, K., Li, J., et al., 2022. Effect of CO2 pre-pad in volume fracturing of conglomerate reservoirs in Mahu Sag, Junggar Basin. Xinjiang Petrol. Geol. 43 (1), 6. https://doi.org/10.7657/XJPG20220106.
Crossref Google Scholar
 

Zhang, C., Liu, S., Ma, Z., Ranjith, P., 2021. Combined micro-proppant and supercritical carbon dioxide (SC-CO2) fracturing in shale gas reservoirs: a review. Fuel 305, 121431. https://doi.org/10.1016/j.fuel.2021.121431.
Crossref Google Scholar
 

Zhang, K., Sang, S., Zhou, X., et al., 2021. Influence of supercritical CO2-H2 O-caprock interactions on the sealing capability of deep coal seam caprocks related to CO2 geological storage: a case study of the silty mudstone caprock of coal seam no. 3 in the Qinshui Basin, China. Int. J. Greenh. Gas Control 106, 103282. https://doi.org/10.1016/j.ijggc.2021.103282.
Crossref Google Scholar
 

Zhao, X., Huang, B., Xu, J., 2019. Experimental investigation on the characteristics of fractures initiation and propagation for gas fracturing by using air as fracturing fluid under true triaxial stresses. Fuel 236, 1496-1504. https://doi.org/10.1016/j.fuel.2018.09.135.
Crossref Google Scholar
 

Zheng, Y., Wang, H., Tian, G., et al., 2022. Experimental investigation of proppant transport in hydraulically fractured wells using supercritical CO2. J. Petrol. Sci. Eng. 217, 110907. https://doi.org/10.1016/j.petrol.2022.110907.
Crossref Google Scholar
 

Zhou, J., Hu, N., Xian, X., et al., 2019. Supercritical CO2 fracking for enhanced shale gas recovery and CO2 sequestration: Results, status and future challenges. Adv. Geo-Energy Res. 3 (2), 207-224. https://doi.org/10.26804/ager.2019.02.10.
Crossref Google Scholar
 

Zou, C., Zhu, K.L., 2019. Preface for the special issue of formation and enrichment of tight (shale) oil resources in Chinese continental basins. J. Asian Earth Sci. 178, 1-2. https://doi.org/10.1016/j.jseaes.2019.03.016.
Crossref Google Scholar
Petroleum Science
Volume 21 Issue 5,
October 2024
Pages 3547-3557
DOI: 10.1016/j.petsci.2024.05.020
Cite this article:
Zang Y-X, Wang H-Z, Wang B, et al. In-situ laboratory study on influencing factors of pre-SC-CO2 hybrid fracturing effect in shale oil reservoirs. Petroleum Science, 2024, 21(5): 3547-3557. https://doi.org/10.1016/j.petsci.2024.05.020

51

Views

0

Downloads

0

Crossref

0

Web of Science

0

Scopus

0

CSCD

Altmetrics
Received: 18 November 2023
Revised: 23 May 2024
Accepted: 25 May 2024
Published: 25 May 2024
© 2024 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Return