天然气水合物被誉为最有研究价值和开采价值的清洁能源,已经成为当今世界能源研究的热点。但到目前为止还未形成成熟稳定的天然气水合物开采技术体系,仍处于研究和试采阶段。陆域冻土天然气水合物开采与海域天然气水合物开采相比相对比较容易,在钻进过程中能够形成较稳定的孔壁。天然气水合物开采的主要方法有热激法、降压法、置换法和化学抑制剂法。SAGD(Steam Assisted Gravity Drainage)技术也叫蒸汽辅助重力驱油技术,在重油、油砂开采中得到了迅速发展,取得了非常有效的成果,被认为是目前重油开采最有效的方法。对SAGD技术应用到陆域冻土天然气水合物开采中进行理论分析研究,经过分析发现将SAGD技术应用到天然气水合物开采中是可行的,但确定两口水平井之间的距离是关键,且在应用时要将上部井变为生产井,下部井变为注汽井。 As a clean energy with the most research value and mining value, natural gas hydrate has become a hot spot in energy research in the world today. However, no mature and stable natural gas hydrate mining technology system has been formed so far, and it is still in the stage of research and trial production. Compared with the natural gas hydrate exploitation in the offshore gas field, the exploitation of natural gas hydrate in the continental frozen land is relatively easy, and the more stable pore wall can be formed during drilling. The main methods of gas hydrate mining are heat shock method, depressurization method, displacement method and chemical inhibitor method. SAGD (Steam Assisted Gravity Drainage) technology, also known as steam-assisted gravity oil displacement technology, has been developed rapidly in heavy oil and oil sands mining and has achieved very good results. It is considered as the most effective method for heavy oil recovery. The SAGD technique is applied to the theoretical analysis of the natural gas hydrate in the continental frozen land. After analysis, it is feasible to apply SAGD technology to the natural gas hydrate mining. However, it is the key to determine the distance between two horizontal wells. When applied, the upper well should be turned into a production well and the lower well into a steam injection well.