Degradation of well cement by CO2 under geologic sequestration conditions

被引：433
作者：
Kutchko, Barbara G.
Strazisar, Brian R.
Dzombak, David A.
Lowry, Gregory V.
Thaulow, Niels
机构：
[1] United States Department of Energy, National Energy Technology Laboratory, Pittsburgh
[2] Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh
[3] RJ Lee Group, Incorporated, Monroeville
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2007年 / 41卷 / 13期
关键词：
D O I：
10.1021/es062828c
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Experiments were conducted to assess the durability of cements in wells penetrating candidate formations for geologic sequestration of CO2. These experiments showed a significant variation in the initial degradation (9 days of exposure) based on the curing conditions. The high-temperature (50°C) and high-pressure (30.3 MPa) curing environment increased the degree of hydration and caused a change in the microstructure and distribution of the Ca(OH)2(s) phase within the cement. Cement cured at 50°C and 30.3 MPa (representing sequestration conditions) proved to be more resistant to carbonic acid attack than cement cured at 22°C and 0.1 MPa. The cement cured at 50°C and 30.3 MPa exhibited a shallower depth of degradation and displayed a well-defined carbonated zone as compared to cement cured under ambient conditions. This is likely due to smaller, more evenly distributed Ca(OH)2(s) crystals that provide a uniform and effective barrier to CO2 attack. © 2007 American Chemical Society.
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页码：4787 / 4792
页数：6
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