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Core NMR Is Suitable For Field Applications In Oilfields
Oct 30, 2017

Core magnetic resonance is a multi-functional high-performance nuclear magnetic equipment, can simulate the stratigraphic environment to rock samples to impose axial pressure, Rock Core NMR & MRI confining pressure and temperature conditions, can achieve oil flooding, water flooding and gas drive experiments, the real simulation of geo-mining environment.

Core nuclear magnetic resonance technical indicators:

1, magnet type: permanent magnet;

2, the magnetic field strength: 0.5 ± 0.05T, Rock Core NMR & MRI the instrument main frequency: 21.3MHz;

3, probe coil diameter: 60mm;

Core Nuclear Magnetic Resonance Application Solution:

Study on High Temperature and High Pressure Environment

Air flooding, oil flooding, water flooding experiment

Experimental seepage mechanism analysis;

Dynamic, timely access to the process of oil, water saturation and oil - bearing changes in the situation;

Displacement environment, fluid distribution, two - dimensional imaging

Core nuclear magnetic resonance as many parameters, rapid detection, no pollution, low cost, simple operation and so on, suitable for field applications. Based on the core analysis of nuclear magnetic resonance (NMR), the effect of fluid content on the shape of the magnetic resonance relaxation time curve is analyzed. Rock Core NMR & MRI The relaxation time spectrum of the core of saturated different fluids is analyzed and analyzed, and the T1 / T2 values are analyzed. A new method of fluid identification using T1 / T2 value is calculated; the magnetic porosity is calculated at different echo intervals, the influence of the echo interval size on the porosity calculation is studied; Rock Core NMR & MRI the empirical formula is used to calculate the applicability of the magnetic permeability; The new model is used to calculate the reliability of the NMR permeability. Based on the pore structure data obtained by the mercury intrusion method, the pore structure is studied by using the NMR relaxation time. The traditional method of nuclear magnetic resonance fluid identification is based on the difference in the longitudinal relaxation time between water and hydrocarbons and the difference in diffusion rate for fluid identification.

Characteristics of Core Nuclear Magnetic Resonance

a, two-dimensional imaging at any level

b, Rock Core NMR & MRI multi-level two-dimensional imaging

c, pore imaging observation

d, moisture content distribution rheological imaging observation

e, high pressure displacement environment fluid distribution changes in two-dimensional imaging

Analysis of on - site drilling cuttings and borehole coring

1, nuclear magnetic cuttings logging analysis

2, lithologic logging reservoir evaluation, reduce the amount of heart, greatly increasing the reservoir geological information. Rock Core NMR & MRI Real-time access to reservoir geological information, Rock Core NMR & MRI to guide the production

3, nuclear magnetic resonance borehole coring analysis

4, to provide mobile water content, quickly determine the flooding situation

Calibration of nuclear magnetic logging scale

Core NMR can carry out nuclear magnetic resonance logging scale calibration work, greatly improve the accuracy of nuclear magnetic logging interpretation

Core magnetic resonance (NMR) is applied to the pore structure of carbonate reservoirs and the identification of fluid properties. However, due to the heterogeneity of carbonate reservoirs, the multi - solution and complexity of conventional logging responses are made. The use of nuclear magnetic resonance logging to reflect the reservoir pore structure and fluid properties can overcome the shortcomings of conventional logging. Based on a large number of core NMR experiments, the relationship between the transverse relaxation T2 spectrum, Rock Core NMR & MRI the relationship between T2 spectrum and pore throat structure, the influence of particle size, the influence of fracture hole, the change rule of T2 cutoff The relationship between porosity and permeability parameters of nuclear magnetic analysis and pore parameters of conventional analysis has been achieved. Rock Core NMR & MRI The experimental results show that the magnetic resonance T2 distribution spectrum reflects the pore structure of the rock, which reflects the pore size distribution and has a good effect in evaluating the pore structure and reservoir effectiveness of carbonate rocks. Rock Core NMR & MRI The effect of resonance measurement is very small and the lower limit of particle size is 2mm. The cuttings drilled by the grinding PDC bit or with the cuttings are not suitable for the application of nuclear magnetic resonance technology. The T2 cutoff value of the carbonate formation is not The T2 distribution spectrum can not effectively reflect the parameters of fractured porosity, but the T2 spectrum can qualitatively identify the reservoirs of pore development.