Design and Experimental Research of a Wellhead Overflow Monitoring System for Open-Circuit Drilling of Natural Gas Hydrate

Chao Zhong (), Jing’an Lu and Dongju Kang
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Chao Zhong: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Jing’an Lu: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Dongju Kang: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China

Energies, 2022, vol. 15, issue 24, 1-11

Abstract: Natural gas hydrate is easy to decompose and leak due to the changes in temperature and pressure during drilling, which causes safety accidents. Early monitoring of wellhead overflow is a practical and effective measure to prevent overflow blowouts and other accidents. Herein, a wellhead methane monitoring system for the open-circuit drilling of marine natural gas was designed. The system consisted of an overwater acoustic reception part and an underwater self-contained methane monitoring part, matching the construction environment of marine natural gas hydrate exploitation. Compared with the existing gas logging technology (measurement while drilling), the monitoring and early warning of wellhead methane content were realized at all stages of drilling, casing running, cementing, completion and fracturing in the process of natural gas hydrate exploitation. System communication and data acquisition tests were completed at different water depths through sea trials, which verified the effectiveness of the system design. The research results provide important theoretical and technical implications for promoting the development of early spill monitoring technology at the wellhead of open-circuit drilling for marine gas hydrates.

Keywords: natural gas hydrate; open-circuit drilling; wellhead monitoring; methane concentration; trial (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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