Large-scale natural gas hydrate formation and decomposition geological environment simulation system and method

Abstract

The invention provides a large-scale natural gas hydrate formation and decomposition geological environment simulation system. The large-scale natural gas hydrate formation and decomposition geological environment simulation system comprises a natural gas hydrate reservoir simulation cavity, a stratum temperature control system, a gas-liquid injection system, an exploitation well system, a production system, a pressure sensor, a displacement sensor and an information acquisition control system; the gas-liquid injection system is in communication with the bottom of a cavity; the exploitation well system is arranged inside the cavity; the production system is connected with the output end of the exploitation well system; the output end of the production system is connected with the input endof the gas-liquid injection system; the pressure sensor is arranged in a simulation layer; the displacement sensor is arranged in the simulation layer; and the information acquisition control systemis electrically connected with the pressure sensor, a temperature control device, the gas-liquid injection system, the production system and the displacement sensor. The invention further provides a simulation method, in-situ geological stratification construction of the natural gas hydrate reservoir in the sea area is achieved, the geological environment system simulation requirement in the large-scale natural gas hydrate forming and decomposing process is met, and the defect that a small-scale simulation system is difficult to achieve pressure gradient changes in a real natural gas hydrate reservoir is overcome.

Description

technical field [0001] The invention relates to the technical field of marine natural gas hydrate development, and more specifically, to a large-scale natural gas hydrate formation and decomposition geological environment simulation system and method. Background technique [0002] Natural gas hydrate (commonly known as combustible ice) is a crystalline clathrate compound formed by gas molecules (mainly methane molecules in nature) and water molecules under high pressure and low temperature environmental conditions. It is estimated that natural gas hydrates contain about twice the carbon content of all fossil fuels combined. Natural gas hydrate has attracted extensive attention from the international community due to its large reserves, wide distribution, high energy density, and clean and pollution-free products after combustion. Natural gas hydrate exists in the seabed sediments or cracks between sedimentary layers in solid form. The decomposition of natural gas hydrate re...

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Problems solved by technology

[0005] The present invention overcomes the technical defect that the existing natural gas hydrate formation and decomposition simulation device cannot truly invert the natural gas hydrate decomposition seepage field, heat transfer field, mass transfer characteristics and phase change characteristics, and is not suitable for large-scale natural gas hydrate exploitation research , to provide a large-scale natural gas hydrate formation and decomposition geological environment simulation system and method

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