Degradation of Well Cement by CO2 under Geologic Sequestration Conditions
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- 作者：Barbara G. Kutchko ; Brian R. Strazisar ; David A. Dzombak ; Gregory V. Lowry ; Niels Thaulow
- 刊名：Environmental Science & Technology
- 出版年：2007
- 出版时间：July 1, 2007
- 年：2007
- 卷：41
- 期：13
- 页码：4787 - 4792
- 全文大小：1216K
- 年卷期：v.41,no.13(July 1, 2007)
- ISSN：1520-5851
文摘
Experiments were conducted to assess the durability ofcements in wells penetrating candidate formations for geologicsequestration of CO2. These experiments showed asignificant variation in the initial degradation (9 days ofexposure) based on the curing conditions. The high-temperature (50 
C) and high-pressure (30.3 MPa) curingenvironment increased the degree of hydration and causeda change in the microstructure and distribution of theCa(OH)2(s) phase within the cement. Cement cured at 50 Cand 30.3 MPa (representing sequestration conditions)proved to be more resistant to carbonic acid attack thancement cured at 22 C and 0.1 MPa. The cement cured at50 C and 30.3 MPa exhibited a shallower depth ofdegradation and displayed a well-defined carbonatedzone as compared to cement cured under ambient conditions.This is likely due to smaller, more evenly distributedCa(OH)2(s) crystals that provide a uniform and effectivebarrier to CO2 attack.
C) and high-pressure (30.3 MPa) curingenvironment increased the degree of hydration and causeda change in the microstructure and distribution of theCa(OH)2(s) phase within the cement. Cement cured at 50 Cand 30.3 MPa (representing sequestration conditions)proved to be more resistant to carbonic acid attack thancement cured at 22 C and 0.1 MPa. The cement cured at50 C and 30.3 MPa exhibited a shallower depth ofdegradation and displayed a well-defined carbonatedzone as compared to cement cured under ambient conditions.This is likely due to smaller, more evenly distributedCa(OH)2(s) crystals that provide a uniform and effectivebarrier to CO2 attack.