Strain analysis for early leakage detection and geomechanical monitoring at CO2 storage sites using distributed fiber optic strain sensing

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2024-12-02 DOI:10.1016/j.fuel.2024.133937
Rasha Amer , Ziqiu Xue , Tsutomu Hashimoto , Takeya Nagata
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引用次数: 0

Abstract

When CO2 is injected into deep saline aquifers, the resulting pressure build-up may cause microseismicity, fault reactivation, and induce damaging earthquakes. Continuous strain data are needed to measure vertical strain migration. Deploying a fiber-optic cable behind a well casing for subsurface geomechanical monitoring offers the opportunity to continuously track the deformation (strain) along the fiber-optic cable. In this study, we conducted three water injection field tests and measured the strain profiles by using distributed fiber optic strain sensing (DFOSS) technique. The first water injection test results showed that the two fiber cable strain measurements at approximately the same distance from the injection well had a strain sensitivity difference of approximately 10 με. The strain sensitivities from wells with different monitoring distances were almost the same. Strain profiles from the other two injection tests showed that the strain responses reveal alternation of sand/silt and reservoir heterogeneity, despite the distances from the injector. In the second injection test, the delayed strain response appeared 10 m above the injection zone associated with the pressure breakdown. In the third test, the DFOSS showed high strain sensitivity with increasing injection pressure, and it could capture a leakage that occurred in the upper zone. The high strain sensitivity of the armored cable, which showed almost the same sensitivity as the flat cable, provides insights into the cable design for deep-well applications. Thus, our results demonstrate the high potential of using DFOSS for caprock and wellbore integrity, leakage monitoring, and geomechanical modeling at geological CO2 storage sites.
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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