超临界CO2吸附效应对页岩地层井壁稳定影响研究

doi:10.13722/j.cnki.jrme.2022.0722

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Abstract When supercritical CO2 is used as drilling fluid to drill shale formation，wellbore stability is one key issue. The interactions between supercritical CO2 and shale are complex. When oil and gas resources are developed with supercritical CO2，the research is little for the influence of supercritical CO2 adsorption on wellbore stability of shale formation. In this study，for the multi-physics coupling process of supercritical CO2 seepage，the influence of supercritical CO2 adsorption on deformation and mechanical properties of shale are considered. Based on the transport and thermodynamic properties of supercritical CO2，the multi-physics coupling models of wellbore stability for supercritical CO2 drilling are established for considering adsorption effect. The finite element numerical method is used to analyze the distribution of formation temperature，pore pressure and stress with time and space in the process of supercritical CO2 drilling，meanwhile，the influence of supercritical CO2 adsorption on wellbore stability of shale are studied. The results indicate that the adsorption-induced solid deformation has little effect on formation temperature and pore pressure，whereas，the stress are influenced greatly by adsorption. The stress value will increase when adsorption-induced strain is considered，while the stress value will decrease when adsorption-enhanced elastic modulus is considered. If adsorption-induced strain is neglected，the risk of wellbore collapse will be slightly underestimated，whereas，if adsorption-enhanced elastic modulus is ignored，the risk of wellbore instability will be greatly underestimated. When the depth exceeds 1 200 m，the collapse pressure is greater than wellbore pressure，the wellbore collapse will occur. This paper can provide theoretical guidance for wellbore stability analysis for supercritical CO2 drilling.

Key words： rock mechanics supercritical CO2 drilling multi-physics fields coupling wellbore stability cycling time adsorption effect

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	Articles by authors
	BAI Bing1
	2
	CHEN Mian1
	2
	JIN Yan1
	2

Cite this article:

BAI Bing1,2,CHEN Mian1, et al. Study on the influence of supercritical carbon dioxide adsorption effect on wellbore stability of shale formation[J]. , 2023, 42(S1): 3508-3518.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0722 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3508

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