Experimental studies on the short term effect of CO2 on the tensile failure of sandstone

Experimental studies on the short term effect of CO2 on the tensile failure of sandstone
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CO2对砂岩拉伸破坏短期影响的实验研究

DOI:
10.1016/j.egypro.2014.11.364
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发表时间:
2014
期刊:
Energy Procedia
影响因子:
--
通讯作者:
Xiaochun Li
Xiaochun Li
中科院分区:
其他
文献类型:
--
作者:
Mingze Liu;Bing Bai;Xiaochun Li

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向地层注入CO2可能引起地层岩石的拉伸破坏。本文研究了CO2对砂岩拉伸破坏行为的短期影响,并分析了水的复合作用对砂岩拉伸破坏行为的影响。采用空心柱法对砂岩样品在干、干CO2、水湿和湿CO2 4种孔隙流体条件下进行压裂。实验结果表明,在相同孔隙流体条件下,试样的有效破裂压力在1.0- 6.0MPa范围内与有效围压呈线性关系;水的存在导致拉伸强度略微减弱5.638%。但无论是否有水的共同作用,CO2气体对砂岩的拉伸破裂行为影响都不明显。研究结果可为CO2封存地层力学稳定性评价提供参考。
The injection of CO2to the formation may cause the tensile failure of the formation rock. The short term effect of CO2on the tensile failure behavior of sandstone with or without the combined effect of water was investigated in this paper. Hollow cylinder method was adopted to fracture the sandstone samples under four types of pore fluid condition: dry, dry with CO2, water wet and wet with CO2. The experimental results indicated that the effective fracturing pressure of the samples under the same pore fluid condition varied linearly with the effective confining pressure in the range of 1.0-6.0 MPa. Existence of water resulted in a slight weakening of 5.638% on the tensile strength. But the tensile fracturing behavior of the sandstone was not obviously affected by gaseous CO2with or without the combined effect of water. The findings can be a reference for the mechanical stability evaluation of the formation in CO2storage.
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