Abstract
The hydrate dissociation and gas production behaviours are studied in a Cuboid Pressure Vessel (CPV) using depressurization and electrical heating method with a central vertical well through experimental simulation. Hydrate samples with the same initial saturations are synthesized in the CPV, which is a novel three-dimensional pressure vessel with the inner effective volume of 1.5 L. A total of four experimental runs (namely Run 1, Run 2, Run 3 and Run 4) are carried out with the heating power of 50, 50, 30 and 0W, respectively, and the corresponding production pressures are 3.5, 4.0, 4.0 and 4.0MPa, respectively. The temperature change, the gas production, the hydrate dissociation and the obtained net energy are analyzed. The results of the gas production and the obtained net energy indicate the commercial feasibility of the well design and the electrical heating method for hydrate exploitation. The results of the hydrate dissociation and production time show that all the hydrate in the CPV can be dissociated completely with the electrical heating method in a shorter time when comparing with the pure depressurization method. The electrical heating will be effective in the process of gas recovery from hydrate deposits.
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