摘要：Hydrate reservoirs with underlying gas are promising for commercial exploitation because the dual-gas coproduction from hydrate and underlying free-gas zones is expected to increase gas yields. In addition, the exploitation of natural gas hydrate deposits mostly suffers from unexpected well pore clogging due to ice generation, hydrate reformation, and sand production. A novel method for forming Class 1G deposits with enriched underlying free gas is proposed and the influence of well closure and production pressure during dual-gas coproduction is investigated. Operational well closure enhances temperature recovery, induces sediment reexpansion, and inhibits gas production. In addition, with a delay in well closure, the above-mentioned influences weaken. The production pressure influences the internal temperature variation during gas production, and a higher production pressure weakens the aforementioned influence of well closure. A lower production pressure and later well closure operation simultaneously enhance gas production, inhibit temperature recovery, and bring a more pronounced sediment shrinkage, implying a competition between reservoir safety and economic benefits of hydrate exploitation. The obtained heat transfer, sediment deformation, and gas production relationships resulting from depressurization and well closure can be used as well-plugging indicators and as a reference for identifying optimum depressurization and well-closure strategies for hydrate reservoir exploitation.

关键字：Hydrate-bearing sediment; Underlying gas; Well closure; Class 1G deposit; Dual-gas co-production

ISSN号：0360-5442

卷、期、页：卷: 279

发表日期：2023-09-15

影响因子：0.000000

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：ENERGY

参与作者：Pang, Wei-Xin,Li, Qing-Ping

通讯作者：孙贤

第一作者：肖朋,王晓辉,孙漪霏,李兴洵,孙长宇,陈光进

论文类型：期刊论文

论文概要：孙贤,肖朋,王晓辉,孙漪霏,李兴洵,Pang, Wei-Xin,Li, Qing-Ping,孙长宇,陈光进，Study on the influence of well closure and production pressure during dual-gas co-production from hydrate-bearing sediment containing underlying gas，ENERGY，2023，卷: 279

论文题目：Study on the influence of well closure and production pressure during dual-gas co-production from hydrate-bearing sediment containing underlying gas