Real-time testing device for molecular adsorption mechanism on surface of natural gas hydrate and testing method

Abstract

The present invention provides a real-time testing device for molecular adsorption mechanism on the surface of natural gas hydrate, which comprises a natural gas cylinder, a constant temperature tank,a computer, a data acquisition circuit, a driving circuit, a microscopic observation device and a visual high pressure reaction kettle. Natural gas is stored in the natural gas cylinder, and a gas outlet of the natural gas cylinder communicates with a gas inlet of the visual high pressure reaction kettle. The visual high pressure reaction kettle comprises a kettle body, which communicates with the constant temperature tank. A circulating medium is stored in the constant temperature tank for reducing the temperature of the kettle body. A QCM probe is arranged in the kettle body; a QCM chip isplaced in the QCM probe and connected with one end of the driving circuit; and the other end of the driving circuit is connected with the computer. A receiving terminal of the data acquisition circuitis connected with the QCM chip; an output terminal of the data acquisition circuit is connected with the computer; and the QCM chip is driven by the driving circuit to vibrate so a stable vibration frequency is generated. The data acquisition circuit collects the vibration frequency of the QCM chip in real time and transmits it to the computer. The microscopic observation device is located abovethe visual high pressure reaction kettle.

Description

technical field [0001] The invention relates to the field of natural gas hydrates, in particular to a real-time testing device and testing method for molecular adsorption mechanism on the surface of natural gas hydrates. Background technique [0002] Natural gas hydrate is an ice-like solid hydrate formed by methane molecules and water molecules under low temperature and high pressure conditions. At present, the research methods for the surface adsorption mechanism of gas hydrate at the microscopic level mainly include molecular dynamics simulation and micro-force observation devices. Among them, the micro-observation force devices mainly include atomic force microscopes and other devices for testing surface mechanics. However, this type of test device can only partially understand the adsorption characteristics of the surface of natural gas hydrate, and cannot measure the mechanical changes and surface adsorption of natural gas hydrate in the process from formation to deco...

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Problems solved by technology

[0003] In view of this, the present invention provides a real-time test device for the molecular adsorption mechanism of natural gas hydrate surface, which solves the problem that the existing test device cannot test the mechanical changes and surface adsorption conditions of natural gas hydrate surface molecular adsorption from formation to decomposition in real time The present invention also provides a real-time test method for the molecular adsorption mechanism of natural gas hydrate surface. Using the test method provided by the present invention, the real-time measurement of the surface adsorption mechanism of natural gas hydrate from formation to decomposition can be realized.

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