Experimental method and device for simulating exploitation of gas hydrates

Abstract

The invention provides an experimental method and a device thereof for simulating the exploitation of gas hydrates, wherein the method includes: underlying gas hydrates are generated in a reaction kettle which is provided with water-containing porous medium fill areas. In the step, experimental gas is led in from the lower part of the reaction kettle, thereby spreading the gas from bottom to top into the porous medium fill areas to generate hydrates. Then the hydrates generated are decomposed by adopting a voltage drop method, a heat injection method and or a chemical injection method; and thegas produced after decomposition of the hydrates is discharged out of the reaction kettle, thus simulating the process of exploitation of hydrates. In addition, the invention also provides a device specially designed for implementing the experimental method. The method and the device not only can make three-dimensional simulation of generation circumstance of the gas hydrates in marine sedimentsand the gas hydrates symbiotic with underlying free gas, but also can simulate exploitation of the hydrates by combining a single principle with a multi principle, and can realistically simulate the exploitation process of the gas hydrates.

Description

technical field [0001] The invention relates to an experimental method and device for simulating the exploitation of natural gas hydrate, which generates natural gas hydrate in a porous medium and adopts different exploitation modes to perform three-dimensional exploitation simulation of hydrate, and belongs to the technical field of marine natural gas hydrate exploitation. Background technique [0002] Gas hydrates are widely distributed in the slopes of continental islands, uplifts of active and passive continental margins, very low continental shelf oceans and deep water environments, and hydrates can store 160-180 m3 per cubic meter. 3 natural gas. It is generally believed that natural gas hydrate, as a clean and efficient energy source, will occupy an important position in the future energy structure. The exploration and development of gas hydrate as an energy resource has been highly valued by governments and research institutions all over the world, and the research ...

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Problems solved by technology

[0009] CN 101050697A and CN 101046146A respectively propose a one-dimensional and two-dimensional exploitation simulation experimental device for natural gas hydrate. However, these devices cannot simulate the hydrate formation environment in which natural gas hydrate and underlying free gas coexist in actual seabed sediments

For the research on the three-dimensional production process of gas hydrate, the current research is mainly to establish mathematical physical models and adopt numerical simulation methods (refer to the literature: Bai Yuhu, Li Qingping, Li Xiangfang, Du Yan. Simulation of gas hydrate reservoir production of underlying gas .Science Bulletin. 2008, Vol. 53, No. 18: 2244-2250; Zuo Lin, You Changfu. Numerical Simulation of Natural Gas Hydrate Production at Fixed Well Pressure. Journal of Tsinghua University (Natural Science Edition), Vol. 48, No. 11, 2008 Period), lack of effective experimental simulation means

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