冷冻屏障强化水合物降压开采数值模拟研究

Numerical simulation study of freezing barrier enhanced depressurization of hydrate exploitation

摘要:

随着全球能源需求的增加，海洋天然气水合物作为潜在的清洁能源受到广泛关注。然而，水合物开采过程中甲烷泄漏和海洋生态破坏问题仍亟待解决。本研究提出了一种基于冷冻屏障的新型水合物开采方法，旨在提升开采效率的同时降低环境风险。冷冻屏障通过在水合物储层上覆层形成固态冰屏障，有效抑制气体扩散、增强储层稳定性并防止海水入侵，同时避免传统开采方法对生态环境的破坏。通过数值模拟对比SH7站点和AT1站点的情况，结果显示，在低渗透率的SH7站点，冷冻屏障使甲烷回收率提升16%，产气量增加17.89%；而AT1站点因屏障位置差异未显现同等效果。研究结果表明，合理配置冷冻屏障为水合物的安全、环保开采提供了有效的技术支持，具有良好的应用前景。

Abstract:

With the increase in global energy demand， marine natural gas hydrates have received widespread attention as a potential source of clean energy. However， methane leakage and marine ecological damage during hydrate extraction remain pressing challenges. In this study， a novel natural gas hydrate extraction method based on a freezing barrier is proposed， which aims to enhance the extraction efficiency and reduce the environmental risks. Through the formation of a solid ice barrier over the hydrate reservoir， the freezing barrier can effectively inhibit gas diffusion， enhance reservoir stability， and prevent seawater intrusion， while avoiding the ecological damage caused by traditional extraction methods. Numerical simulations comparing the SH7 site and the AT1 site show that in the low-permeability SH7 site， the freezing barrier increases the methane recovery rate by 16% and gas production by 17.89%， while the AT1 site does not show the same effect due to the difference in the barrier location. The results of the study show that the rational configuration of the freezing barrier provides effective technical support for the safe and environmentally friendly exploitation of natural gas hydrates and has good application prospects.