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Journal of the Korean Society of Hazard Mitigation 2015;15(3):201-206.
Published online June 30, 2015.
CO₂ 포화 염수 투과실험에 따른 유정시멘트의 성분분석
김영진, 윤태섭, 염광수, 김광염, 김정중
Analysis of Oil Well Cement Composition after Penetration Experiment with CO₂-saturated Brine
Young Jin Kim, Tae Sup Yun, Kwang Soo Youm, Kwang Yeom Kim, Jung Joong Kim
Abstract
The integrity of oil well cement (OWC), cured under high temperature and pressure, may degrade upon the exposure to the CO₂-sat-urated brine. In this study, a test setup was devised to examine the composition changes of hardened OWC due to the migration of CO₂-saturated brine under high temperature and pressure. The Class G OWC cured at ambient conditions was used for the test set-up. The estimated pH of the brine saturated with CO₂ for 24 hours under 10 MPa and 40oC was 3.14. The 3D micro computed tomog-raphy enables the evaluation of the spatial configuration of internal structures for carbonated produced by Ca(OH)2 in the hydrated OWC, corroborated by X-ray diffraction analyses that reveal the increment of CaCO₃. Moreover, 29Si Nuclear Magnetic Resonance results showed the carbonation of calcium silicate hydrates (C-S-H) in the hydrated OWC.
Key Words: Carbonation; Bicarbonation; Oil well cement; Penetration experiment
요지
지중의 높은 압력과 온도에서 양생되는 유정공 시멘트 (Oil Well Cement, OWC)는 CO₂ 포화 염수에 의하여 열화될 수 있다. 본 연구에서는 CO₂ 포화 염수에 의한 OWC의 미세구조 변화를 연구하기 위하여 지중과 동일한 온도와 압력조건 하에서 CO₂ 포화 염수를 투과시키는 방법을 개발하였다. 표준 양생된 Class G OWC 시편이 사용되었다. 압력 10 MPa에서 48시간동안 CO₂를 융해시킨 포화 염수의 pH는 3.14로 계산되었다. OWC내 수산화칼슘이 CO₂와 반응하여 생성된 탄산칼슘에 대한 3차원 미세단층촬영으로 시편내부의 분포양상을 확인하였고, X선 회절분석을 통해 탄산칼슘의 증가추이를 확인하였다. 또한, 칼슘-실리케이트 수화물의 탄산화를 29Si 핵자기공명 분석을 통해 확인하였다.
핵심용어: 이산화탄소; 탄산화; 유정시멘트; 미세구조; 고온고압 투과실험; CO₂
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