Testing device and method for adhesive force between gas hydrate and mineral particles

Abstract

The invention provides a testing device and method for adhesive force between gas hydrate and mineral particles. The device comprises an atomic power microscope, a thermal insulation glove box, a low-temperature sample table, a circulating cooling fan, a high-pressure air source, a pump and a liquid nitrogen tank, wherein the atomic power microscope, a high-pressure cavity and refrigeration equipment are combined to realize the in-situ synthesis of a gas hydrate sample on the low-temperature sample table and keep the gas hydrate stable, and external force required when the gas hydrate and themineral particles are separated under a constant-pressure low-temperature condition is obtained through the single-point force curve technology of the atomic power microscope, wherein external force is adhesive force between the hydrate and the mineral particles. By use of the device, the adhesive force between the hydrate and the mineral particles can be conveniently and accurately measured, andthe device has an obvious practical value for evaluating the mechanical property of a hydrate reservoir and guiding sea area hydrate development.

Description

technical field [0001] The invention relates to the field of testing the adhesion of microparticles, in particular to a testing device and method for the adhesion between gas hydrates and mineral particles. Background technique [0002] Gas hydrate is one of the most potential unconventional and clean alternative energy sources after shale gas, coalbed methane and tight gas. It is mainly a crystallized ice-like "cage compound" formed by small molecule hydrocarbon gases such as methane and water under high pressure and low temperature conditions. It is estimated that the gas hydrate reserves in the South my country Sea alone are about 85 trillion cubic meters. Its exploitation and utilization are of great significance to alleviate the pressure of my country's energy shortage and adjust the energy structure. In May 2017, my country has successfully launched a trial mining project of gas hydrates in the Shenhu area of ​​the South China Sea, but how to safely, efficiently, long...

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Problems solved by technology

[0004] Generally, AFM can only be tested at normal pressure, and its detection laser will heat the probe, and when the temperature is higher than the gas hydrate phase equilibrium temperature, it will produce a phase change, so how to maintain the gas hydrate sample during the test Stability is the key issue whether this technology can be applied in the field of gas hydrate testing

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