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http://dx.doi.org/10.9720/kseg.2016.1.101

Physical and Mechanical Properties of Cements for Borehole and Stability Analysis of Cement Sheath  

Kim, Kideok (Geologic Environment Research Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Hikweon (Geologic Environment Research Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Taehee (Geologic Environment Research Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Gyo-Won (Department of Geology, Kyungpook National University)
Publication Information
The Journal of Engineering Geology / v.26, no.1, 2016 , pp. 101-115 More about this Journal
Abstract
We carried out laboratory material tests on two cements (KS-1 ordinary Portland and Class G) with changing W/S (Water/Solid) and the content of fly ash in order to evaluate their physical and mechanical properties. The specimens of KS-1 ordinary Portland cement were prepared with varying W/S (Solid=cement) in weight, while those of Class G cement were prepared with changing the content of fly ash in volume but maintaining W/S (Solid=cement+fly ash). The results of the material tests show that as the W/S in KS-1 ordinary Portland cement and the content of fly ash in Class G cement increase, the properties (density, sonic wave velocity, elastic constants, compressive and tensile strengths, thermal conductivity) decrease, but porosity and specific heat increase. In addition, an increase in confining pressure and in the content of fly ash leads to plastic failure behavior of the cements. The laboratory data were then used in a stability analysis of cement sheath for which an analytical solution for computing the stress distribution induced around a cased, cemented well was employed. The analysis was carried out with varying the injection well parameters such as thickness of casing and cement, injection pressure, dip and dip direction of injection well, and depth of injection well. The analysis results show that cement sheath is stable in the cases of relatively lower injection pressures and inclined and horizontal wells. However, in the other cases, it is damaged by mainly tensile failure.
Keywords
geological CO2 storage; well integrity; cement sheath damage; physical properties; mechanical properties; KS-1 ordinary Portland cement; Class G cement;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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