Method for testing wettability and pore size of material by utilizing dynamic nuclear polarization enhancement
A technology of dynamic nuclear polarization and pore size, which is applied to the analysis of nuclear magnetic resonance, analysis of materials, suspensions and porous materials, etc., can solve the problems that cannot effectively reflect the change of wetting phase, and achieve high test efficiency, Improved sensitivity and shorter testing time
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Embodiment 1
[0029] 1. Select water as the wetting solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve TEMPO in water, and prepare a TEMPO aqueous solution with a concentration of 10 mM;
[0030] 2. Inject the TEMPO aqueous solution into the sample tubes of model A1, model A2, model A3, model A4, model A5, and model A6 respectively, infiltrate the glass beads stacked in it, and absorb the free state aqueous solution in the upper layer of the sample tube after the infiltration is completed ;
[0031] 3. Conduct NMR experiments on model A1, model A2, model A3, model A4, model A5, and model A6, collect FID signals of model A1, model A2, model A3, model A4, model A5, and model A6, calculate and record the model Spectral peak areas of the NMR spectra of A1, Model A2, Model A3, Model A4, Model A5, and Model A6;
[0032] 4. Under the same experimental conditions as in step 3, microwave excitation is applied, and the microwave power is 5W. Model A1, model A...
Embodiment 2
[0041] 1. Select 5# mineral oil as the immersion solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve TEMPO in 5# mineral oil, and prepare a TEMPO mineral oil solution with a concentration of 10 mM;
[0042] 2. Inject TEMPO mineral oil solution into the sample tubes in Model A1, Model A2, Model A3, Model A4, Model A5, and Model A6 respectively, infiltrate the stacked glass beads, and absorb the free state of the upper layer in the sample tube after the infiltration is completed. mineral oil solution;
[0043] 3. Conduct NMR experiments on model A1, model A2, model A3, model A4, model A5, and model A6, collect FID signals of model A1, model A2, model A3, model A4, model A5, and model A6, calculate and record the model Spectral peak areas of the NMR spectra of A1, Model A2, Model A3, Model A4, Model A5, and Model A6;
[0044]4. Under the same experimental conditions as in step 3, microwave excitation is applied, and the microwave power is ...
Embodiment 3
[0054] 1. Select water as the wetting solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve TEMPO in water, and prepare a TEMPO aqueous solution with a concentration of 10 mM;
[0055] 2. Select sandstone with permeability of 950md, 100md, 50md, and 3md for testing. The four kinds of sandstone are named sandstone B1, sandstone B2, sandstone B3, and sandstone B4 according to the permeability from large to small. The sandstone is measured by mercury porosimetry. The average pore diameters of B1, sandstone B2, sandstone B3, and sandstone B are 22.1um, 9.7um, 7.5um, and 0.8um in sequence. Sandstone B1, sandstone B2, sandstone B3, and sandstone B4 are infiltrated with TEMPO aqueous solution, and taken out after infiltration each sandstone and wipe off the residual moisture on the surface of each sandstone;
[0056] 3. Carry out NMR experiments on sandstone B1, sandstone B2, sandstone B3 and sandstone B4, collect FID signals of sandstone B1, san...
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