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 test system and a low-field nuclear magnetic resonance multi-probe quantitative test method special for hydrate.The test system comprises a low-field nuclear magnetic resonance analyzer, a confining pressure-adding low-temperature high-pressure probe, a confining pressure-free low-temperature high-pressure probe, a confining pressure-free normal-temperature normal-pressure probe, a temperature confining pressure control module, a pore fluid supply module and an industrial personal computer. Through combined use of the confining pressure-adding low-temperature high-pressure probe, the confining pressure-free low-temperature high-pressure probe and the confining pressure-free normal-temperature normal-pressure probe and the improved design of the structure as well as by adoption of a multi-probe combined use mode, research on integration of hydrate-containing deposit low-field nuclear magnetic resonance measuring signal quantitative calibration and hydrate-containing deposit pore scale behavior measuring analysis is realized, research on the hydrate-containing deposit pore scale behavior featureis facilitated, and foundation is laid for discussion on hydrate-containing deposit basic physical property parameter change micromechanism.

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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