A sand-production control system for gas production from clayey silt hydrate reservoirs |
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| Institution: | 1. Key Laboratory for Gas Hydrate of Ministry of Natural Resources, China Geological Survey, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;4. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;5. Guangzhou Marine Geological Survey, China Geological Survey, Ministry of Natural Resources, Guangzhou 510075, China |
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| Abstract: | Sand production is a crucial problem during the process of extracting natural gas from hydrate reservoirs. To deal with sand-production problems systematically, a sand-production control system (SCS) is first proposed in this paper, specialized for pore-distributed clayey silt hydrate reservoirs. Secondly, a nodal system analysis method (NSAM) is applied to analyze the sand migration process during hydrate exploitation. The SCS is divided into three sub-systems, according to different sand migration mechanisms, and three key scientific problems and advances in SCS research in China Geological Survey are reviewed and analyzed. The maximum formation sanding rate, proper sand-control gravel size, and borehole blockage risk position were provided for clayey hydrate exploitation wells based on the SCS analysis. The SCS sub-systems are closely connected via bilateral coupling, and coordination of the subsystems is the basis of maintaining formation stability and prolonging the gas production cycle. Therefore, contradictory mitigation measures between sand production and operational systems should be considered preferentially. Some novel and efficient hydrate exploitation methods are needed to completely solve the contradictions caused by sand production.© 2019 China Geology Editorial Office. |
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| Keywords: | Natural gas hydrate Hydrate exploitation Sand-production management Sand production Sand control Nodal system analysis |
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