Fracture network stimulation effect on hydrate development by depressurization combined with thermal stimulation using injection-production well patterns

Xiuping Zhong, Dongbin Pan, Ying Zhu, Yafei Wang, Lianghao Zhai, Xitong Li, Guigang Tu and Chen Chen

Energy, 2021, vol. 228, issue C

Abstract: In this study, the stimulation effect of the fracture network on hydrate development by depressurization combined with hot water injection (D + Tiw) utilizing injection-production well patterns was explored and the key fracture properties’ influences on stimulation effect were investigated. The results showed that D + Tiw significantly improved hydrate decomposition, but has a minimal enhancement on CH4 production owing its extremely low CH4 recovery ratio. The fracture network improved CH4 production of D + Tiw significantly. Water breakthrough of production wells has a strong influence on D + Tiw development performance; and, divided the influence of fracture conductivity on hydrate development into two opposite stages. The change in fracture spacing caused a hydrate decomposition mode transformation. Under larger fracture spacing, hydrate decomposition occurred in the piston-like decomposition mode and the effect of fracture spacing on hydrate development performance was minimal. However, when fracture spacing was small enough to transform the hydrate decomposition into a non-piston-like decomposition mode, hydrate decomposition and CH4 production rate increased sharply.

Keywords: Natural gas hydrate; Fracture network; Depressurization combined thermal stimulation; Stimulation effect (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:228:y:2021:i:c:s0360544221008501

DOI: 10.1016/j.energy.2021.120601

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