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The Principle Of Core NMR
Jul 18, 2017

Core NMR can be conveniently used to analyze cores and drilling debris in field and exploratory wells. The instrument can measure cores up to 1.5 inches in diameter and is controlled by windows-based laptops. The system is tightly assembled in two of aerial suitcases and can be easily and safely transported in the air and land.

· Compact Instrument for field and flow testing

· Resonant frequency 2MHz

· Probe diameter up to 40 mm

· User can set all measurement parameters

Core NMR is essential for nuclear magnetic logging, and a large number of early nuclear magnetic resonance research work has laid a solid foundation for NMR logging. The preliminary research work includes the main principle of the application of the porous rock nuclear magnetic logging, Rock Core NMR & MRI such as fluid surface relaxation, body relaxation and diffusion relaxation characteristics, rock porosity, permeability, pore structure, wettability and relaxation characteristics of the relationship between the binding fluid, and the relaxation characteristics of the movable fluid, a lot of experiments have been carried out on the differences of oil, Rock Core NMR & MRI water and gas relaxation characteristics, and the hypotheses and approximations in the analysis and processing of the experimental data are fully elaborated, for the application of NMR logging data to the physical parameters of the rocks and the identification of oil, gas and water , the prediction of capacity and other aspects of the application Foundation.

The application of core NMR to this kind of oil and gas resources development has important guiding role. The characteristics of NMR T2 spectrum response, nuclear magnetic porosity, T2 cutoff value of movable fluid and rock specific surface distribution were studied by using NMR and gas-water centrifugation. Rock Core NMR & MRI Research results show that the T2 spectrum of shale can be divided into 3 types, namely Unimodal T2 spectrum, Shuangfeng T2 spectrum with isolated right peak and Shuangfeng T2 spectrum of the left and right peaks, and most of the T2 relaxation time is less than 10ms, and the fractured pores in the reservoir account for about 9.16% of the total pore space. Based on NMR T2 spectra, the surface of shale ratio is mainly distributed in 3.59-80.51μm-1. Rock Core NMR & MRI The magnetic porosity of shale is generally smaller than that of water, and the average error is about 22.33%, which is related to the pore of clay and the development of fracture porosity. Based on the experimental results of gas-water centrifuge, the T2 cutoff value of NMR movable fluid in shale reservoir is calculated at 3.87-16.68ms, the average is 8.29ms, Rock Core NMR & MRI the average of the free gas saturation of the reservoir Matrix Rock is about 9.72%.