Low-field nuclear magnetic resonance multi-probe quantitative test system and method special for hydrate

Abstract

The invention discloses a low-field nuclear magnetic resonance multi-probe quantitative testing system and method for hydrates. The normal temperature and pressure probe, the temperature confining pressure control module, the pore fluid supply module and the industrial computer, through the combined use and structure of the low temperature and high pressure probe with confining pressure, the low temperature and high pressure probe without confining pressure and the normal temperature and pressure probe without confining pressure The improved design of the multi-probe method realizes the quantitative calibration of low-field NMR measurement signals of hydrate-containing sediments and the integrated research of the pore-scale behavior measurement and analysis of hydrate-containing sediments, which facilitates the pore-scale behavior of hydrate-containing sediments. The characteristic research lays the foundation for the exploration of the microcosmic mechanism of the basic physical parameters of hydrate-bearing sediments.

Description

technical field [0001] The invention belongs to the field of basic physical property testing of unconventional oil and gas reservoir engineering and geotechnical engineering, and specifically relates to a special low-field nuclear magnetic resonance multi-probe quantitative testing system and method for hydrates. Background technique [0002] Gas hydrate is widely distributed in deep ocean stratum environment and permafrost stratum environment in nature. It is rich in natural gas and is considered as an important potential alternative energy source. The dissociation of gas hydrates will weaken the reservoir strength and release a large amount of potent greenhouse gases, and it is also considered as a possible mechanism for inducing engineering geological disasters and global climate change. Therefore, natural gas hydrate has received extensive attention worldwide, and researchers from various countries have carried out a lot of research work from different angles, and on thi...

AI Technical Summary

Problems solved by technology

However, the pore-scale behavior of hydrate-bearing sediments is more complex than that of conventional geotechnical materials, and the corresponding measurement experiments need to be carried out under low temperature and high pressure conditions, resulting in the existing low-field NMR measurements such as mercury porosimetry and dehumidification methods. The signal quantitative calibration method fails, and the low-field NMR quantitative test technology has encountered unprecedented challenges in the field of natural gas hydrate research, and the corresponding experimental test methods and supporting experimental test systems are still relatively scarce

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