The gas production behaviors of methane hydrate dissociation induced by depressurization and electrical heating are investigated in a Cuboid Pressure Vessel (CPV) with an effective volume of 1.5 L. The vertical well located at the axis of the vessel is used as the production well, and a resistance heating wire is distributed uniformly in the inner surface of the well for heat injection. Hydrate samples with the similar phase saturations are prepared and then decomposed under depressurization and electrical heating. A total of five experimental runs have been carried out with different production pressure (3.50, 4.50, and 5.50 MPa) and electrical heating power (0, 25, and 50 W). It is found that methane hydrate can be dissociated continuously in the CPV in each run, which proves the feasibility of the used method for hydrate exploitation in porous media. Compared with the pure depressurization case (run 3), both the gas production and hydrate dissociation rates could be increased to a much higher level when a relatively slow heat injection rate is supplied from the well. In addition, the net energy E_net can be recovered with a much faster rate under constant electrical heating rate, and the final amount of E_net is only a little lower than that of run 3. They all indicate that the production efficiency of depressurization can be greatly enhanced by employing the electrical heating simultaneously. A maximum E_net can be obtained in each case with constant electrical heating, and it is suggested that the production process should be terminated before E_net begins to drop. The gas production performance is generally more favorable under lower production pressure and a higher electrical heating rate.

在有效容积为1.5 L的长方体压力容器（CPV）中研究了由减压和电加热引起的甲烷水合物分解的产气行为。位于容器轴线的垂直井用作生产井，并且电阻加热丝均匀地分布在井的内表面中以进行热注入。制备具有相似相饱和度的水合物样品，然后在减压和电加热下分解。在不同的生产压力（3.50、4.50和5.50 MPa）和电加热功率（0、25和50 W）下，总共进行了五次实验。发现每次运行中甲烷水合物可以在CPV中连续分解，证明了所用方法在多孔介质中水合物开采的可行性。与纯减压情况（实验3）相比，当从井中提供相对较慢的热注入速率时，产气量和水合物的离解速率都可以提高到更高的水平。另外，净能量在恒定的电加热速率下，E _net可以更快的速度回收，并且E _net的最终量仅比运行3的量低一点。所有这些都表明，通过使用Enet可以大大提高降压的生产效率。同时进行电加热。在恒定的电加热下，每种情况下均可获得最大的E _net，建议在E _net开始下降之前终止生产过程。在较低的生产压力和较高的电加热速率下，气体生产性能通常更有利。