超临界CO2压裂强化页岩气开采与CO2地质封存一体化技术：结果、现状和挑战

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超临界CO2压裂强化页岩气开采与CO2地质封存一体化技术：结果、现状和挑战

Advances in Geo-Energy Research, 2019, 3(2): 207-224

原文网址: https://www.yandy-ager.com/index.php/ager/article/view/137

        超临界二氧化碳(ScCO2)压裂强化页岩气开采与CO2地质封存一体化技术具有广阔的应用前景，可以减少页岩气开发过程水资源的消耗，在提高页岩气采收率的同时实现CO2封存。基于室内试验，理论模型和现场验证，研究多相多组分气体(ScCO2，气态CO2和CH4等)环境下复杂页岩气储层力学、流动特性具有重要意义。

       近日，重庆大学周军平副研究员等综述ScCO2射流破岩机理、ScCO2压裂机理、CO2/CH4在页岩中的竞争吸附现象、多场耦合条件下CO2提高页岩气采收率过程多组分多相CO2/CH4流动机理、以及页岩层中CO2封存潜力等关键科学问题的进展。结果表明，ScCO2射流具有较强的岩石侵蚀能力和破岩能力，且破岩门限压力比水射流低。相比水力压裂技术，ScCO2压裂页岩的起裂压力比水力压裂低50%左右，且更能形成复杂体积缝网。现场试验表明，ScCO2压裂技术显著提高了页岩气产量。最后，指出了该技术所面临的挑战，并提出了今后需要进一步研究的问题。

Supercritical CO2 fracking for enhanced shale gas recovery and CO2 sequestration: Results, status and future challenges

Junping Zhou, Nan Hu, Xuefu Xian, Lei Zhou, Jiren Tang, Yong Kang, Haizhu Wang

(Published: 2019-05-01)

CorrespondingAuthor and Email:

Junping Zhou, zhoujp1982@sina.com;

ORCID: https://orcid.org/0000-0002-7218-3235

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Citation: Zhou, J., Hu, N., Xian, X., Zhou, L., Tang, J., Kang, Y., Wang, H. Supercritical CO2 fracking for enhanced shale gas recovery and CO2 sequestration: Results, status and future challenges. Advances in Geo-Energy Research, 2019, 3(2): 207-224, doi: 10.26804/ager.2019.02.10.

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ArticleType: Original article

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Abstract：

    Supercritical carbon dioxide (ScCO2)-based fracturing technology associating with CO2 enhanced shale gas recovery is a promising technology to reduce the water consumption and could provide the potential for CO2 sequestration. Advancing the understanding of complex gas shale reservoir behavior in the presence of multiphase and multicomponent gases (ScCO2, gaseous CO2 and CH4 etc.) via laboratory experiments, theoretical model development and field validation studies is very important. In this paper, the progress of some key scientific problems such as the mechanism of ScCO2 drilling and completion, the ScCO2 fracturing technology, the competition adsorption behaviors of CO2/CH4 in shale, the coupled multiphase and multicomponent CO2/CH4 flow during the CO2 enhanced shale gas recovery process and the CO2 sequestration potential in shale formation were discussed. The results indicated that the ScCO2 jet has a stronger rock erosion ability and requires much lower threshold pressure than water jet. The fracture initiation pressure of ScCO2 is about 50% lower than that of hydraulic fracturing, and the volume of rock fractured by ScCO2 is several times larger than that of hydraulic fracturing. Field test shown that the shale gas production rate was significant increased by the ScCO2-based fracturing technology. Finally, the challenges of the technique will face and the further research is needed in the future is exposed.

Keywords: Shale gas, supercritical carbon dioxide fracturing, competition adsorption, CO2 enhanced shale gas recovery, multiphase flow, CO2 sequestration.

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