Research on online temperature and corrosion monitoring system for oil shale in situ heater
Hao Yang,
Junshan Ren,
Hao Zeng,
Tianyu Sun
Affiliations
Hao Yang
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, 197 Baisha Road, Changping District, Beijing 100083, China; State Center for Research and Development of Oil Shale Exploitation, 197 Baisha Road, Changping District, Beijing 100083, China; School of Engineering and Technology, China University of Geosciences (Beijing) 29 Xueyuan Road, Haidian District, Beijing 100083, China
Junshan Ren
School of Engineering and Technology, China University of Geosciences (Beijing) 29 Xueyuan Road, Haidian District, Beijing 100083, China
Hao Zeng
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, 197 Baisha Road, Changping District, Beijing 100083, China; State Center for Research and Development of Oil Shale Exploitation, 197 Baisha Road, Changping District, Beijing 100083, China
Tianyu Sun
School of Engineering and Technology, China University of Geosciences (Beijing) 29 Xueyuan Road, Haidian District, Beijing 100083, China
The harsh environment during in situ heating of oil shale significantly impacts the structure and materials of downhole heaters. This paper presents the design of an online temperature and corrosion monitoring system for downhole in situ heaters in oil shale wells, utilizing thermocouple technology for temperature monitoring and fiber optic grating technology for corrosion monitoring. The system enables high-precision temperature measurements up to 500â¯Â°C using thermocouples and real-time, high-sensitivity corrosion monitoring via fiber optic grating technology. The measured corrosion rates are consistent with those obtained from the weight loss method and inductive probe method but exhibit faster response times. The monitoring system adopts oil pipes as the lowering carrier, with fiber optic grating installed along the horizontal section. Data are efficiently transmitted through wired transmission technology, combined with a short-section mounting structure and a nano-aerogel thermal insulation protection device to ensure the systemâs applicability and stability under high-temperature and high-pressure conditions. The online monitoring system developed in this paper provides a solution for designing and monitoring the performance of oil shale in situ heaters in the field.
