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首页> 外文期刊>Journal of natural gas science and engineering >An analytical solution to simulate the effect of cement/formation stiffness on well integrity evaluation in carbon sequestration projects
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An analytical solution to simulate the effect of cement/formation stiffness on well integrity evaluation in carbon sequestration projects

机译：一种模拟解决方案，可模拟固井/地层刚度对固碳项目井完整性评估的影响

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摘要

Cement Sheath integrity has been gain more attention due to the increase of carbon sequestration activities in the recent years. Sealing ability of cement sheath can be lost because mechanical disruption in the CO2 injection wells. Cement sheath mechanical failure can occur in the CO2 injection wells. This paper proposes an analytical solution to address this issue. Cement sheath and formation rock stiffness are considered in the proposed model to simulate the cement sheath sealing ability on different depth of the formation. Both mechanical properties of cement and formations are evaluated and analyzed. Real field example is also provided. Young's modulus of cement sheath is identified as a major factor that affects the sealing ability of cement sheath. The sealing ability of cement sheath in shale formation is better than that in sandstone formation. Weak cement has better sealing ability than strong cement. The critical failure point lies at the top of sandstone formation. This model can also be used to design and optimize the cement system of new CO2 injection wells in carbon sequestration projects. (C) 2015 Elsevier B.V. All rights reserved.
机译：由于近年来固碳活动的增加，水泥护套的完整性受到了越来越多的关注。由于二氧化碳注入井中的机械破裂，水泥护套的密封能力可能会丧失。二氧化碳注入井中可能发生水泥护套机械故障。本文提出了解决此问题的分析解决方案。所提出的模型考虑了水泥鞘和地层岩石的刚度，以模拟不同地层深度下的水泥鞘密封能力。水泥和地层的机械性能均经过评估和分析。还提供了实地示例。水泥护套的杨氏模量被认为是影响水泥护套密封性能的主要因素。页岩地层中水泥护套的封闭能力要好于砂岩地层。弱水泥比强水泥具有更好的密封能力。关键破坏点位于砂岩地层的顶部。该模型还可用于设计和优化固碳项目中新的二氧化碳注入井的水泥系统。 （C）2015 Elsevier B.V.保留所有权利。

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