Method and device for measuring heat conduction coefficient of natural gas hydrate in porous medium

Abstract

The invention discloses a method and a device for measuring the heat conduction coefficient of a natural gas hydrate in a porous medium. The device provided by the invention comprises a pressure stabilizing gas-liquid supplying module, a temperature control module, a heat conduction coefficient measuring module and a data collecting module; the hydrate generation and the heat conduction coefficient determining are carried out in a high-pressure reaction kettle. The axis of the reaction kettle is provided with a resistance wire which can provide stable power so as to continuously heat up a porous medium containing the hydrate; three thermoelectric couples are distributed additionally on the cross section, in which the central point of the resistance wire is positioned, of a kettle body, and are used for analyzing the stable-station transmission characteristics of heat along the cross section in heating. According to the method and the device, a stable-station measurement technique is combined, and can be used for measuring the effective heat conduction coefficient of the porous medium containing the hydrate, comprehensively studying the saturability degrees of different hydrates, heat conduction coefficient models under different temperatures and pressures and different deposition particles, and provides a theory basis for practical exploiting of the natural gas hydrates.

Description

technical field [0001] The invention relates to a method and a device for measuring the thermal conductivity of natural gas hydrate in porous media. Background technique [0002] Natural gas hydrate, also known as combustible ice, is a white crystalline compound formed by natural gas and water under certain conditions (temperature, pressure, gas saturation, salinity, etc.). As a new type of potential energy, natural gas hydrate has huge reserves. It is considered to be one of the most promising new energy sources that can replace petroleum and other fossil energy sources, and has been widely found in seabed sediments and terrestrial permafrost regions. [0003] The commercial value of natural gas hydrate production in the field is affected by many geological conditions, among which the thermal conductivity of the formation is one of the key factors affecting the rate of hydrate decomposition and gas production. Thermal conductivity reflects the heat transfer capability of p...

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Problems solved by technology

Due to the phase transition process of hydrate decomposition and formation in the solid phase, the measurement and research of the thermal conductivity of hydrate-containing porous media is more complicated. The current research on the thermal conductivity characteristics of hydrate formations is still in the stage of theoretical analysis, and there is a lack of sufficient research. Experimental data support and verification, so the heat transfer mechanism of hydrate-containing porous media is not perfect, and cannot provide reliable theoretical guidance for actual hydrate production

[0004] Conventional experimental devices and instruments for measuring the thermal conductivity of substances are mostly operated under normal temperature and pressure conditions, but for porous media containing hydrates, due to the influence of the stable conditions of the hydrate itself (low temperature, high pressure), it is difficult to use conventional thermal conductivity measuring instruments. measurement, it is necessary to develop a special experimental device

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