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Swelling and Mechanical Property Change of Shale and Sandstone in Supercritical CO2

초임계 CO2에 의한 셰일 및 사암의 물성변화 및 스웰링에 관한 연구

  • Received : 2012.08.20
  • Accepted : 2012.08.24
  • Published : 2012.08.31

Abstract

In this study, a method is devised to implement a supercritical $CO_2$ ($scCO_2$) injection environment on a laboratory scale and to investigate the effects of $scCO_2$ on the properties of rock specimens. Specimens of shale and sandstone normally constituting the cap rock and reservoir rock, respectively, were kept in a laboratory reactor chamber with $scCO_2$ for two weeks. From this stage, a chemical reaction between rock surface and the $scCO_2$ was induced. The effect of saline water was also investigated by comparing three conditions ($scCO_2$-rock, $scCO_2-H_2O$-rock and $scCO_2$-brine(1M)-rock). Finally, we checked the changes in the properties before and after the reaction by destructive and nondestructive testing procedures. The swelling of shale was a main concern in this case. The experimental results suggested that $scCO_2$ has a greater effect on the swelling of the shale than pure water and brine. It was also observed that the largest swelling displacement of shale occurred after a reaction with the $H_2O-scCO_2$ solution. The results of a series of the destructive and nondestructive tests indicate that although each of the property changes of the rock differed depending on the reaction conditions, the $H_2O-scCO_2$ solution had the greatest effect. In this study, shale was highly sensitive to the reaction conditions. These results provide fundamental information pertaining to the stability of $CO_2$ storage sites due to physical and chemical reactions between the rocks in these sites and $scCO_2$.

Keywords

CCS(carbon capture & storage);Laboratory experiment;Supercritical $CO_2$;Rock properties;Swelling

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Cited by

  1. Reaction in High Pressure Condition vol.26, pp.4, 2016, https://doi.org/10.7474/TUS.2016.26.4.293

Acknowledgement

Grant : CO2 해양지중저장 기술개발

Supported by : 한국해양과학기술진흥원