Abduction of underground carbon dioxide is considered a safe and effective way to address the growing greenhouse effect. How to deal with the risk of leakage of carbon dioxide during storage is a difficult problem.China has made significant progress in real-time dynamic monitoring of the carbon dioxide flooding process, which helps to solve this problem.
On the 9th, the reporter learned from the Institute of Rocks and Soil Mechanics of the Chinese Academy of Sciences that the researchers used Bragg's fiber sensing technology for real-time dynamic monitoring of the process of carbon dioxide displacement in different states for the first time, revealing stress induced by the injection pressure of carbon dioxide. Field Variation Characteristics and Migration Edge Laws.
According to the researcher, the deep underground salt bed is considered the ideal location for long-term storage of carbon dioxide due to its wide distribution and large storage capacity. However, due to changes in the reservoir stress field and the existence of natural fractures, faults and other structures and geological structures, carbon dioxide has a risk of leakage during storage.
Based on this, real-time monitoring of the carbon dioxide migration process has become an important issue in the international academic community. However, previous studies have not had the simultaneous monitoring of stress field changes and migration fronts in the real-time migration of carbon dioxide under storage conditions.
Researchers at the Institute of Rock and Soil Mechanics of the Chinese Academy of Sciences have used a core displacement caliper to simulate the process of stable displacement of supercritical carbon dioxide in the laboratory. The experimental results show that the dynamic response of the core surface deformation is related to the injection pressure of carbon dioxide and maintains a linear growth relationship.
According to reports, Bragg fiber wire sensor is a new type of fiber sensor developed in recent years. According to the results of the measurement of the fiber Bragg grid in the experiment, the monitoring technology can observe the migration path of the carbon dioxide fluid and the corresponding border information so that it can be applied to on-site leak monitoring of carbon dioxide storage.
Currently, the results of the research were published in the internationally renowned academic journal "Greenhouse Gas: Science and Technology".
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