Method for measuring oil-water distribution by using DP-MRI

A distribution method, oil-water technology, applied in the direction of using double resonance for analysis, double resonance for measurement, and nuclear magnetic resonance for analysis, etc., can solve the problems of limited application, increased test time, inability to effectively distinguish, etc., to ensure reliability. , the effect of improving sensitivity and short measurement time

Active Publication Date: 2019-08-02
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

However, under low-field conditions, different fluids are often distinguished by the relaxation or diffusion properties of the sample, but due to the heterogeneity of the material structure and the difference in fluid distribution, different fluids may have the same relaxation or diffusion properties, which cannot be effectively distinguish
In addition, the lower sensitivity and resolution of NMR greatly increases the testing time of samples, and further limits the application of conventional MRI methods in measuring oil-water distribution.

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  • Method for measuring oil-water distribution by using DP-MRI
  • Method for measuring oil-water distribution by using DP-MRI
  • Method for measuring oil-water distribution by using DP-MRI

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Embodiment 1

[0027] 1. Make glass bead models to simulate porous materials containing oil and water, glass bead models (such as figure 1 Shown) is made as follows: take a quartz tube 1 with a diameter of 10mm, one end of the quartz tube 1 is open, and the other end is sealed, and the glass beads 2 with a particle diameter of 3-5mm are randomly stacked in the 10mm quartz tube. Contains relaxation reagent MnCl 2 Water and mineral oil containing free radical TEMPO (tetramethylpiperidine nitrogen oxide) are layered to infiltrate the glass beads in the quartz tube. The upper layer is the oil phase and the lower layer is the water phase. TEMPO can strengthen the oil phase under DNP conditions. NMR signal, MnCl 2 It can enhance the relaxation of the aqueous phase and suppress the NMR signal of the aqueous phase under DNP conditions;

[0028] 2. Place the glass bead model in the sample area of ​​a 0.06T DNP magnetic resonance imaging system. In this system, the static magnetic field is provided ...

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Abstract

The invention discloses a method for measuring oil-water distribution by using DP-MRI. The method comprises the following steps: 1, adding free radicals for DNP enhanced water phase or oil phase NMR signals into a to-be-measured sample containing oil and water; 2, performing an MRI experiment on the to-be-detected sample, and acquiring an MRI image without DNP enhancement of the to-be-detected sample; 3, applying microwave excitation under the same MRI experiment condition as the step 2, and carrying out DNP-MRI testing: collecting an MRI image of the to-be-tested sample after DNP enhancement;and 4, comparing the MRI image after DNP enhancement with the MRI image without DNP enhancement, wherein in the MRI image after DNP enhancement, the area with enhanced MRI signal intensity is a selective enhanced fluid phase distribution area, and the area with unobviously changed MRI signal intensity is a non-selective enhanced fluid phase distribution area. The method is simple, convenient to operate, short in measurement time and high in measurement efficiency.

Description

technical field [0001] The invention belongs to the technical field of nuclear magnetic resonance applications, and in particular relates to a method for measuring oil-water distribution by using DNP-MRI, which can be applied to analyze fluid distribution and flow laws in porous materials. Background technique [0002] Porous materials such as reservoir rocks are rich in different fluid phases such as oil and water. The distribution of oil and water in rock formations is a key issue in the exploration of seepage / displacement laws. The acquisition of two-phase distribution information is helpful for understanding two-phase saturation. Important parameters such as degree and relative permeability can provide reference for reservoir evaluation and development. [0003] NMR technology is widely used in the study of the structure and fluid properties of porous materials such as rock cores due to its non-destructive testing characteristics. [0004] Under high-field NMR, using oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081G01N24/12G01R33/62G01R33/448Y02A90/30G01R33/56509
Inventor 陈黎陈俊飞刘朝阳张震冯涛冯继文陈方
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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