摘要：Combining depressurization and other stimulation methods has been proven an efficient method for hydrate exploitation. In this work, we focused on the oceanic hydrate reservoir and numerically studied hydrate production by N2/air sweep combined with depressurization in horizontal well system. A series of field-scale simulations were conducted to investigate the influence of production pressure and gas injection timing on gas/water production, energy consumption and net energy production. The results indicated that N2/air sweep can effectively overcome the shortcomings in pure depressurization, thus achieving a much higher methane production efficiency, especially for mild depressurization conditions. Constrained by rapidly decreasing CH4 concentration around the production well, the enhancement of gas production and net energy production by gas sweep is temporary. The enhancement of net energy production mainly comes from increased CH4 production rather than reduced energy consumption of seawater lifting. Within the energy consumption items, gas separation is the dominant contributor. Under reasonable production pressure and injection timing, combining depressurization with gas sweep can significantly improve CH4 production efficiency and net energy production compared to pure depressurization. Process optimization should focus on the quality of produced gas, and based on this, we further provided the optimization directions and some specific strategies. ? 2025 Elsevier Ltd

ISSN号：0016-2361

卷、期、页：v 389,

发表日期：2025-06-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）

发表期刊名称：Fuel

通讯作者：杨建豪

第一作者：阚京玉,李智,徐振,李楠,陈光进

论文类型：期刊论文

论文概要：阚京玉,杨建豪,李智,徐振,李楠,陈光进，Evaluation of gas production from oceanic hydrate deposits by N2 sweep combined with depressurization，Fuel，2025，v 389,

论文题目：Evaluation of gas production from oceanic hydrate deposits by N2 sweep combined with depressurization