Experiment simulation method and device for exploiting natural gas hydrate through water current erosion method

Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to anexperiment simulation method and device for exploiting natural gas hydrate through a water current erosion method. Aiming at the insufficiencies existing in the current hydrate exploiting process, based on the influence of water flowing on the stable existence of the hydrate, through the decomposition of the hydrate caused by the chemical potential difference between the hydrate phase and the environmental water phase generated in the water flowing process and the influence of the water flowing speed on the decomposition speed of the hydrate in combination with other hydrate exploiting methods like a pressure drop exploiting method and a heat injection exploiting method, the experimentsimulation method and device for exploiting the natural gas hydrate through the water current method are provided. The experiment simulation method and device provide a basisfor safely and efficiently exploiting the hydrate and also is significant in subsequent study of a natural gas hydrate exploiting method.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and in particular relates to an experimental simulation method and device for natural gas hydrate exploitation by a water flow erosion method. Background technique [0002] As an alternative new energy source, natural gas hydrate has the characteristics of high energy density, large reserves, sustainability, and environmental friendliness, and has broad prospects for exploitation and development. Realizing the exploitation of natural gas hydrate can effectively change my country's energy consumption structure, which is of great significance to the development of my country's energy industry. Gas hydrate, as an unstable complex composed of water and natural gas, can only be formed when the phase is below equilibrium. Factors affecting the phase balance of gas hydrate mainly include: chemical potential, temperature, pressure, etc. Once some of these conditions chang...

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Problems solved by technology

The water flow erosion method solves the problems existing in other mining methods: First, it solves the reservoir temperature sudden change caused by a large amount of hydrate decomposition and endothermic heat, as well as a large amount of gas caused by increased pressure and accelerated flow during other methods of hydrate mining. This will lead to formation icing and secondary hydrate formation, which will reduce reservoir permeability and affect mining efficiency and safety.

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