Abstract
In the process of gas hydrate exploitation, methane leakage needs to be monitored in real time, so an in-situ electrical monitoring system for methane leakage is designed. The monitoring system is mainly composed of monitoring cable, acquisition station, power module and general control platform. According to the electrical principle, the system carries out regional monitoring on the seabed formation, forms the resistivity map, and realizes methane leakage monitoring. The cost of the monitoring system is low, and it can be remotely controlled or automatically collected data according to the preset program, so the system has good application and research value.
Highlights
Natural gas hydrate is considered to be the most potential energy in the 21st century[1], but the development of natural gas hydrate will face the risks of methane leakage, seabed subsidence, submarine landslide, pockmarks and so on[2,3,4,5,6,7]
In order to ensure the safety of the project, it is necessary to monitor the leakage of methane gas in real time in the process of natural gas hydrate exploitation
There are some limitations in the above methods, the monitoring range of methane leakage monitoring technology of submarine buoy is small and has a certain lag, the operation cost of DSS is high, and it takes a lot of labour and material resources to obtain the monitoring data each time
Summary
Natural gas hydrate is considered to be the most potential energy in the 21st century[1], but the development of natural gas hydrate will face the risks of methane leakage, seabed subsidence, submarine landslide, pockmarks and so on[2,3,4,5,6,7]. The mainstream monitoring methods are the bottom mounted submarine buoy integrated with methane concentration sensor and horizontal multi beam sonar device, as well as the air trap device[8,9]. The former can monitor methane concentration in water in real time, while the latter can monitor gas leakage rate. Resistivity imaging method has many practical applications in monitoring gas storage and migration, gas content in pore space[13,14,15] Both model and in-situ experiments show that resistivity imaging technology can effectively describe the spatial distribution of non-conductive medium in pore space and preliminarily estimate its saturation. We uses the resistivity acquisition technology to design an in-situ electrical monitoring system to monitor methane leakage
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