A kind of pressure-holding transfer type triaxial device and method for natural gas hydrate core sample

Abstract

The invention relates to a natural gas hydrate rock core sample dwell transfer-type triaxial apparatus and a method thereof, which belongs to the technical field of natural gas hydrate base physical property measurement. The apparatus comprises a rock core transfer apparatus, a triaxial apparatus host, a confining pressure and aperture pressure control system, a computer data acquisition and a control system. By using the triaxial apparatus, a rock core is transferred from a sample storage device to the rock core transfer apparatus; the rock core transfer apparatus and the triaxial apparatus host are subjected to abutting joint and locked; a dwell rock core is transferred to a triaxial pressure chamber by the dwell rock core, an original plastic sleeve of the rock core is removed, and the rock core is sleeved by a rubber membrane, and pressure control and motion control are required during whole course of a hydrate dwell rock core transfer process. The apparatus realizes transfer of the hydrate dwell rock core, and realizes deposit intensity measurement under original cementation structure condition and consolidating condition of the hydrate, mechanical property of a practical storage layer is obtained, and the method has important meaning for revealing the destroy mechanism of the practical storage layer and evaluating the risk of exploitation geology of the natural gas hydrate.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate basic physical property measurement, and relates to a pressure-holding and transfer-type triaxial device and method for a natural gas hydrate core sample. Background technique [0002] Many researchers believe that natural gas hydrate can replace traditional fossil fuels such as coal and oil to become a new generation of energy because of its huge reserves and clean and pollution-free combustion. It is widely distributed in the outer margins of the continent and permafrost. % of land and 90% of ocean waters are potential areas for gas hydrates, and it is estimated that the methane content in global gas hydrates is about 1.8×10 16 m 3 , which is equivalent to twice the total carbon content of currently proven fossil fuels (coal, oil and natural gas); in addition, natural gas is a clean energy source, which produces less carbon dioxide than coal and oil, and does not Harmful gases such...

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Problems solved by technology

However, at present, the existing domestic triaxial instrument can only perform mechanical tests on natural gas hydrate artificial cores in the laboratory, and the requirements for experimental conditions are relatively high; there is no domestic method that can directly test the mechanical properties of natural gas hydrate pressure-holding core samples. The researched experimental device cannot obtain the shear strength, volume change, permeability, creep strength and other data of the in-situ state core of marine gas hydrate

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