Theoretical Study on the Application of SAGD Technology in Exploitation of Natural Gas Hydrate in Land Permafrost Region

Abstract:

Natural gas hydrate is regarded as clean energy with research and production value, which has become a hot research topic in the world. But so far, it is still in the research and production stage, no mature and stable gas hydrate production technology system has formed. The exploitation of natural gas hydrate in land permafrost region is relatively easy in contrast with the exploitation of natural gas hydrate in sea area, and the stable hole wall can form during the drilling process. The main natural gas hydrate exploitation methods are thermal stimulation method, depressurization method, displacement method and chemical inhibitor method. SAGD technology is also known as steam assisted gravity drainage, it has been rapidly developed in heavy oil and oil sands mining with very effective results, and is considered to be the most effective way of heavy oil exploitation. In this paper, the application of SAGD technology in natural gas hydrate exploitation in land permafrost region is analyzed, it is found that SAGD technology is feasible in the application of natural gas hydrate mining; however, it is very important to determine the distance between the 2 horizontal wells, and in the application, the upper well should be changed into a production well, while the lower one into the steam injection well.