Study on the Flow Behavior of Wellbore Fluids of a Natural Gas Hydrate Well with the Combined Depressurization and Heat Injection Method

Natural gas hydrate (NGH) is a kind of clean energy with great potential because its huge reserves. There are several effective methods for exploiting sediments such as depressurization, thermal excitation, inhibitor injection and displacement, etc. Among these methods, the combined depressurization heat method considered very promising method, which solves problem insufficient supply during process. In this paper, mechanism exploitation NGH analyzed, multiphase flow models well production established, respectively, parallel horizontal system method. The laws fluids in wellbore were obtained, factors affecting temperature pressure distributions analyzed. results study show that water produced simultaneously process electric submersible pump has influence on wellbore, there sudden skips at position. Increasing depth working frequency will reduce risk continuous discharge from annulus. rate can both improve effect injection. This provides theoretical guidance extraction optimization NGH.