Experimental study on stress sensitivity of underground gas storage
Experimental study on stress sensitivity of underground gas storage
复制标题
地下储气库应力敏感性试验研究
DOI：
10.1016/j.petrol.2020.107577
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发表时间：
2020-12
影响因子：
--
通讯作者：
Zhang Nan
中科院分区：
文献类型：
--
作者：
Shao Jiaxin;You Lijun;Kang Yili;Gao Xinping;Chen Mingjun;Meng Sen;Zhang Nan
有效应力和有效应力作用时间的增加降低了岩石裂隙的渗透率。XG地下储气系统建于碳酸盐岩地层。裂缝是碳酸盐岩孔缝性地层的主要渗流通道。地下储气库多周期注采过程中的交变应力使裂缝周期性地张开和闭合。这导致了地层的应力敏感性，降低了岩石裂缝的渗透率。本文以XG地下储气库碳酸盐岩地层典型岩样为研究对象，进行了应力敏感实验、气速敏感实验和考虑有效应力作用时间的应力敏感实验。对实验过程中岩样的渗透率进行了测量。利用扫描电子显微镜对岩石试件在应力敏感性试验前后以及考虑有效应力作用时间的应力敏感性试验前后的断裂壁进行了分析。探讨了有效应力和有效应力作用时间对地下储气库渗透性的影响机理。采用应力敏感系数法评价应力敏感性。结果表明，考虑有效应力作用时间的断裂试件和基质试件的应力敏感性比应力敏感性试验有所提高。随着有效应力作用时间的增加，岩石的弹塑性变形增加了裂隙壁上微凸体的破裂。此外，微裂缝的产生降低了岩石的强度。微凸体的破裂和微裂隙的产生增强了岩石的应力敏感性。此外，注采压力梯度过大导致的精细运移也增加了应力敏感性。
The increase in effective stress and effective stress action time reduces the permeability of rock fractures. XG underground gas storage systems are constructed in carbonate formations. Fractures constitute the main seepage channel of pore-fracture carbonate formation. Alternating stress during multi-cycle injection-production of underground gas storage causes the fractures to open and close periodically. This leads to stress sensitivity of the formation and reduces the permeability of rock fractures. In this work, typical rock samples of carbonate formation in XG underground gas storage were selected as the research object, and stress sensitivity experiments, gas speed sensitivity experiments and stress sensitivity experiments considering effective stress action time were carried out. The rock sample permeability during the experiment was measured. The fracture walls of rock samples before and after the stress sensitivity experiments and stress sensitivity experiment considering the effective stress action time were analyzed by SEM. The influence mechanism of effective stress and effective stress action time on permeability of underground gas storage was explored. Stress sensitivity coefficient method was used to evaluate stress sensitivity. The results show that the stress sensitivity of fracture and matrix samples considering effective stress action time was enhanced compared with stress sensitivity experiments. With the increase in effective stress action time, the elastic-plastic deformation of rock increased the breaking of micro-convex bodies on the fracture wall. Moreover, micro-fractures were generated to reduce rock strength. The breaking of micro-convex bodies and the generation of micro-fractures strengthened the stress sensitivity of rocks. Moreover, fine migration caused by excessive injection-production pressure gradient also increased the stress sensitivity.
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影响因子：
--
作者：
E. Gundersen;François Renard;D. Dysthe;K. Bjørlykke;B. Jamtveit
通讯作者：
E. Gundersen;François Renard;D. Dysthe;K. Bjørlykke;B. Jamtveit
影响因子：
--
作者：
You L;Xue K;Kang Y;Liao Y;Kong L
通讯作者：
Kong L
影响因子：
5.2
作者：
J. Gaillard;Cheng Chen;S. H. Stonedahl;B. Lau;D. Keane;A. Packman
通讯作者：
J. Gaillard;Cheng Chen;S. H. Stonedahl;B. Lau;D. Keane;A. Packman
DOI：
10.2118/1110-0088-jpt
发表时间：
2010-11
期刊：
Journal of Petroleum Technology
影响因子：
--
作者：
D. Denney
通讯作者：
D. Denney
DOI：
10.1016/j.ijrmms.2006.02.004
发表时间：
2006-09-01
影响因子：
7.2
作者：
Fabre, Geraldine;Pellet, Frederic
通讯作者：
Pellet, Frederic