Study on the influence of supercritical carbon dioxide adsorption effect on wellbore stability of shale formation
BAI Bing1，2，CHEN Mian1，2，JIN Yan1，2
(1. State Key Laboratory of Petroleum Resources and Prospecting，China University of Petroleum(Beijing)，Beijing 102249，
China；2. College of Petroleum Engineering，China University of Petroleum(Beijing)，Beijing 102249，China)
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.
白 冰1，2，陈 勉1，2，金 衍1，2. 超临界CO2吸附效应对页岩地层井壁稳定影响研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3508-3518.
BAI Bing1，2，CHEN Mian1，2，JIN Yan1，2. Study on the influence of supercritical carbon dioxide adsorption effect on wellbore stability of shale formation. , 2023, 42(S1): 3508-3518.
[1] 陈 勉，金 衍，卢运虎. 页岩气开发：岩石力学的机遇与挑战[J]. 中国科学：物理学•力学•天文学，2017，47(11)：6–18.(CHEN Mian，JIN Yan，LU Yunhu. Shale gas development：Opportunities and challenges for rock mechanics[J]. Scientia Sinica Physica Mechanica Astronmica，2017，47(11)：6–18.(in Chinese))
[2] 曾义金，周 俊，王海涛，等. 深层页岩真三轴变排量水力压裂物理模拟研究[J]. 岩石力学与工程学报，2019，38(9)：1 758–1 766. (ZENG Yijin，ZHOU Jun，WANG Haitao，et al. Research on true triaxial hydraulic fracturing in deep shale with varying pumping rates[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(9)：1 758–1 766.(in Chinese))
[3] 郭旭升，腾格尔，魏祥峰，等. 四川盆地深层海相页岩气赋存机制与勘探潜力[J]. 石油学报，2022，43(4)：453–468.(GUO Xusheng，TENG Geer，WEI Xiangfeng，et al. Occurrence mechanism and exploration potential of deep marine shale gas in Sichuan Basin[J]. Acta Petrolei Sinica，2022，43(4)：453–468.(in Chinese))
[4] 张金川，史 淼，王东升，等. 中国页岩气勘探领域和发展方向[J]. 天然气工业，2021，41(8)：69–80.(ZHANG Jinchuan，SHI Miao，WANG Dongsheng，et al. Fields and directions for shale gas exploration in China[J]. Natural Gas Industry，2021，41(8)：69–80.(in Chinese))
[5] 王瑞和，倪红坚，宋维强，等. 超临界CO2钻井基础研究进展[J]. 石油钻探技术，2018，46(2)：1–9.(WANG Ruihe，NI Hongjian， SONG Weiqiang，et al. The development of fundamental research on supercritical carbon dioxide drilling[J]. Petroleum Drilling Techniques，2018，46(2)：1–9.(in Chinese))
[6] 杜玉昆. 超临界CO2射流破岩机制研究[博士学位论文][D]. 青岛：中国石油大学(华东)，2012.(DU Yukun. Study on the rock-breaking mechanism of supercritical carbon dioxide jet[Ph. D. Thesis][D]. Qingdao：China University of Petroleum(East China)，2012.(in Chinese))
[7] 沈忠厚，王海柱，李根生. 超临界CO2连续油管钻井可行性分析[J]. 石油勘探与开发，2010，37(6)：743–747.(SHEN Zhonghou，WANG Haizhu，LI Gensheng. Feasibility analysis of coiled tubing drilling with supercritical carbon dioxide[J]. Petroleum Exploration and Development，2010，37(6)：743–747.(in Chinese))
[8] NOVOSAD Z，COSTAIN T. New interpretation of recovery mechanisms in enriched gas drives[J]. Journal of Canadian Petroleum Technology，1988，27(2)：54–60.
[9] 金 衍，陈 勉. 水敏性泥页岩地层临界坍塌时间的确定方法[J]. 石油钻探技术，2004，32(2)：12–14.(JIN Yan，CHEN Mian. A method for determining the critical time of wellbore instability at water- sensitive shale formations[J]. Petroleum Drilling Techniques，2004，32(2)：12–14.(in Chinese))
[10] 曹文科. 力学–化学–热耦合作用对各项异性页岩井壁稳定性影响规律研究[博士学位论文][D]. 北京：中国石油大学(北京)，2017. (CAO Wenke. Study of mechanical-chemical-thermal coupling effect on wellbore stability in anisotropic shale formation[Ph. D. Thesis][D]. Beijing：China University of Petroleum(Beijing)，2017.(in Chinese))
[11] DING L，NI H J，LI M K，et al. Wellbore collapse pressure analysis under supercritical carbon dioxide drilling condition[J]. Journal of Petroleum Science and Engineering，2018，161：458–467.
[12] 白 冰，陈 勉，金 衍. 超临界CO2渗流的流–固–热多场耦合机制研究[J]. 中国科学：物理学•力学•天文学，2023，53(2)：101–113.(BAI Bing，CHEN Mian，JIN Yan. Mechanism of hydro-mechanical-thermal field coupling for supercritical CO2 seepage[J]. Scientia Sinica Physica，Mechanica and Astronomica， 2023，53(2)：101–113.(in Chinese))
[13] AO X，LU Y Y，TANG J R，et al. Investigation on the physics structure and chemical properties of the shale treated by supercritical CO2[J]. Journal of CO2 utilization，2017，20：274–281.
[14] 陈钰婷. 超临界CO2作用下页岩力学特性研究[硕士学位论文][D]. 重庆：重庆大学，2016.(CHEN Yuting. Test study on the effects of supercritical CO2 on shale mechanical properties[M. S. Thesis][D]. Chongqing：Chongqing University，2016.(in Chinese))
[15] LYU Q，LONG X P，RANGITH P G，et al. Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2[J]. Energy，2018，147： 1 288–1 298.
[16] BAI B，NI H J，SHI X，et al. The experimental investigation of effect of supercritical CO2 immersion on mechanical properties and pore structure of shale[J]. Energy，2021，228：1–12.
[17] PAN Z J，CONNELL L D. A theoretical model for gas adsorption-induced coal swelling[J]. International Journal of Coal Geology，2007，69(4)：243–252.
[18] 周军平，鲜学福，姜永东，等. 基于热力学方法的煤岩吸附变形模型[J]. 煤炭学报，2011，36(3)：468–472.(ZHOU Junping，XIAN Xuefu，JIANG Yongdong，et al. A model of adsorption induced coal deformation based on thermodynamic approach[J]. Journal of China Coal Society，2011，36(3)：468–472.(in Chinese))
[19] HARPALANI S，PRUSTY B K，DUTTA P，et al. Methane/CO2 sorption modeling for coalbed methane production and CO2 sequestration[J]. Energy and Fuels，2006，20(4)：1 591–1 599.
[20] SAKUROV R，DAY S，WERI S，et al. Application of a Modified Dubinin-Radushkevich Equation to adsorption of gases by coals under supercritical conditions[J]. Energy and Fuels，2007，21(2)：992–997.
[21] 敖 翔，卢义玉，汤积仁，等. 页岩吸附CO2变形特性试验研究[J]. 煤炭学报，2015，40(12)：2 893–2 899.(AO Xiang，LU Yiyu，TANG Jiren，et al. Deformation properties of shale by sorbing carbon dioxide[J]. Journal of China Coal Society，2015，40(12)：2 893– 2 899.(in Chinese))
[22] SPAN R，WAGNER W. a new equation of state for carbon dioxide covering the fluid region from the triple-point temperature to 1 100 K at pressures up to 800 MPa[J]. Journal of Physical and Chemical Reference Data，2009，25(6)：1 510–1 596.
[23] FENGHOUR A，WAKEHAM W A，VESOVIC V. The viscosity of carbon dioxide[J]. Journal of Physical and Chemical Reference Data，1998，27(1)：31–44.
[24] VESOVIC V，WAKEHAM W A，OLCHOWY G A，et al. The transport properties of carbon dioxide[J]. Journal of Physical and Chemical Reference Data，1990，19(3)：763–808.
[25] 王元元. 超临界CO2对页岩力学参数的影响研究[硕士学位论文][D]. 北京：中国石油大学(北京)，2018.(WANG Yuanyuan. Effects of Supercritical Carbon Dioxide on Mechanical Parameters of Shale[M. S. Thesis][D]. Beijing：China University of Petroleum (Beijing)，2018.(in Chinese))
[26] 金 衍，陈 勉. 井壁稳定力学[M]. 北京：科学出版社，2012：45–48.(CHEN Mian，JIN Yan. Mechanics of wellbore stability[M]. Beijing：Science Press，2012：45–48.(in Chinese))
[27] NI H J，SONG W Q，WANG R H，et al. Coupling model for carbon dioxide wellbore flow and heat transfer in coiled tubing drilling[J]. Journal of Natural Gas Science and Engineering，2016，30：414–420.
2023, Vol. 42 
