Citation: | CHEN Qiang, LIU Kun, LIANG Yu, SUN Jianye, LI Yanlong, WU Nengyou, LIU Changling. DEVELOPMENT OF CH4-CO2 OPTICAL FIBER GAS SENSOR MONITORING INSTRUMENT FOR NATURAL GAS HYDRATE PRODUCTION WELL[J]. Marine Geology Frontiers, 2021, 37(10): 78-84. doi: 10.16028/j.1009-2722.2020.178 |
The development of natural gas hydrate has attracted great attention from all over the world. Japan, China and some other countries have successfully implemented the trial production at sea, which further confirmed the resource potential and development feasibility of gas hydrate. However, the monitoring methods for gas composition in production well are far from perfect up to date, which restricts the production process evaluation and risk prediction. Based on the principles of TDLAS, a set of gas composition sensing and monitoring system for methane and carbon dioxide is designed, and the miniaturization and anti-interference improvement are realized according to the gas hydrate production well conditions. It is verified that the developed optical fiber gas composition monitoring instrument is effective and stable for measurement of CH4 with concentration above 50×10−6 and CO2 with concentration above 100×10−6.
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Schematic diagram of TDLAS gas sensor system
Prototype of TDLAS gas sensor in laboratory
The relations between current and wavelength or power of laser with central wavelength of 1654 nm at different temperatures
Structure diagram of multi reflection long optical path gas absorption cell
Methane concentration calibration results
Carbon dioxide concentration calibration results
Wavelength division multiplexing sensing gas chamber protective sleeve
Optimization of ground equipment
Labview software control interface
CH4 concentration calibration results
CO2 concentration calibration results
CH4 gas concentration stability test results
CO2 gas concentration stability test results