The Nuclear Magnetic Resonance Experimental Study Of CH₄ Transporting In Coal Body

Coalbed methane (in short as CBM or gas) is the strategic alternative energy in 21st century. Its exploitation is highly emphasized all over the world. As the special geological conditions in China, the theory of storage and transport of CBM which is to fit Chinese situation has been not established until now. And the existed theories are not clear and definite in the mechanism and rule. So new experiment method to test the theories is needed at urgent.Nuclear Magnetic Resonance (NMR) as an advanced non-damaged measurement technique provides a new research way. The moulding coal with larle pore rate replace the nature coal in this article, base on the adsorption and desorption of CBM,With the triaxial osmoscope made up of non-magnetic polycarbonate material was designed and developed, by change confining pressure, axial pressure and pore pressure,study the characteristic of adsorption.Dissertated the basic principle of NMR and the CBM of NMR as well as the NMRI& NMR spectrum technique. From the NMRI experiment we can find that CH₄ can image, In the NMR spectrum experiment, find the relationship between the relaxation time and the conditon of presence about CBM.From the new experimental view, novelly the NMRI&NMR spectrum technique were introduced into the research of storage and transport of CBM. The coherent theories were studied and the NMRI & NMRspectrum experiments were real-time and visually measured. The mechanism of storage and transport of CBM was disclosed. The theory of storage and transport of CBM was expanded and tested. According to the research of theory and experiment, the effective technical measures to improve the output of CBM will be found. The research has important practical application significance and theoretical value.