| Study of the Reservoir Damage during Cyclic Injection and Extraction Process in the Hutubi Gas Storage |
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| 作者姓名： | Wang Jianbo Ge Hongkui Wang Xiaoqiong Liu Tongyuan Liu Dunqing Zhang Yanjun Wu Shan |
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| 作者单位： | Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China;China University of Petroleum(Beijing) at Karamay, Karamay 834000, Xinjiang, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China,Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China |
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| 基金项目： | This project was supported by the Study on Multi-scale Mechanism in the Tianshan Area Using Large Airgun Source (Grant No.201508008),the National Science and Technology Major Project (Grant No.2017ZX05039-004). |
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| 摘 要： | During the injection and extraction process in gas storage,cyclic loading stress is applied to the reservoir pore structure,affecting the capacity and service life of gas storage. To study the influence of cyclic injection and extraction on reservoir physical property,a finite-element model of reservoir elastoplastic damage under the effect of pore pressure is established based on elastoplastic mechanics and fatigue-damage mechanics. Considering the mechanical property of the Hutubi reservoir and the injection-extraction mode of gas storage,the finite-element model is used to study the pore pressure and porosity change,fault safety,and ground surface deformation. The results show that the change in pore pressure and porosity,the deformation of the Hutubi fault,as well as the uplift and sink of the grounds surface are controlled by the fatigue damage of the reservoir pore structure during the injection-extraction process. After a 6-year service life, the cumulative deformation of the reservoir pore reaches its limit,causing pore structure collapse and porosity decrease. As a result,storage capacity declines and the ground surface starts to sink. Through this study,the safety of the Hutubi gas storage is evaluated,and some suggestions for field operations are offered.
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| 关 键 词： | Gas storage Injected/extracted Fatigue damage Porosity |
| 收稿时间： | 2018/5/22 0:00:00 |
Study of the Reservoir Damage during Cyclic Injection and Extraction Process in the Hutubi Gas Storage |
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| Wang Jianbo,Ge Hongkui,Wang Xiaoqiong,Liu Tongyuan,Liu Dunqing,Zhang Yanjun,Wu Shan.Study of the Reservoir Damage during Cyclic Injection and Extraction Process in the Hutubi Gas Storage[J].Earthquake Research in China,2018,32(2):288-300. |
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| Authors: | Wang Jianbo Ge Hongkui Wang Xiaoqiong Liu Tongyuan Liu Dunqing Zhang Yanjun and Wu Shan |
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| Institution: | Unconventional |
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| Abstract: | During the injection and extraction process in gas storage, cyclic loading stress is applied to the reservoir pore structure, affecting the capacity and service life of gas storage. To study the influence of cyclic injection and extraction on reservoir physical property, a finite-element model of reservoir elastoplastic damage under the effect of pore pressure is established based on elastoplastic mechanics and fatigue-damage mechanics. Considering the mechanical property of the Hutubi reservoir and the injection-extraction mode of gas storage, the finite-element model is used to study the pore pressure and porosity change, fault safety, and ground surface deformation. The results show that the change in pore pressure and porosity, the deformation of the Hutubi fault, as well as the uplift and sink of the ground''s surface are controlled by the fatigue damage of the reservoir pore structure during the injection-extraction process.After a 6-year service life, the cumulative deformation of the reservoir pore reaches its limit, causing pore structure collapse and porosity decrease. As a result, storage capacity declines and the ground surface starts to sink. Through this study, the safety of the Hutubi gas storage is evaluated, and some suggestions for field operations are offered. |
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| Keywords: | Gas storage Injected/extracted Fatigue damage Porosity |
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