A method for testing wettability and pore size of materials using 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, The effect of high sensitivity and short test time
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Embodiment 1
[0029] 1. Select water as the infiltration solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve THETEMO in water, and prepare it into an aqueous solution of TEMPO with a concentration of 10mM;
[0030] 2. Inject TEMPO aqueous solution into the sample tubes of Model A1, Model A2, Model A3, Model A4, Model A5, and Model A6, infiltrate the stacked glass beads, and aspirate the aqueous solution in the upper free state 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 the FID signals of model A1, model A2, model A3, model A4, model A5, and model A6, and calculate and record the peak area of nmR spectra of model A1, model A2, model A3, model A4, model A5, and model A6;
[0032] 4. Under the same experimental conditions as step 3, apply microwave excitation, microwave power is 5W, model A1, model A2, model A3, model A4, model A5, mode...
Embodiment 2
[0041] 1. Select 5# mineral oil as the infiltration solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve TEMPO in 5# mineral oil, and formulate a TEMPO mineral oil solution with a concentration of 10mM;
[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, infiltrate the stacked glass beads, and aspirate the mineral oil solution in the upper free state of the sample tube after the infiltration is completed;
[0043] 3. Conduct NMR experiments on model A1, model A2, model A3, model A4, model A5, and model A6, collect the FID signals of model A1, model A2, model A3, model A4, model A5, and model A6, and calculate and record the peak area of nmR spectra of model A1, model A2, model A3, model A4, model A5, and model A6;
[0044] 4. Under the same experimental conditions as step 3, apply microwave excitation, microwave power is 5W, model A1, model A2, model A3, model ...
Embodiment 3
[0054] 1. Select water as the infiltration solution, select TEMPO (tetramethylpiperidine nitrogen oxide) as the free radical, dissolve THETEMO in water, and prepare it into an aqueous solution of TEMPO with a concentration of 10mM;
[0055] 2. The permeability of sandstone with permeability of 950md, 100md, 50md and 3md was selected for testing, and the four kinds of sandstone were named sandstone B1, sandstone B2, sandstone B3 and sandstone B4 according to the permeability rate from large to small, and the average aperture of sandstone B1, sandstone B2, sandstone B3 and sandstone B B was measured by mercury pressure method as 22.1um, 9.7um, 7.5um, 0.8um, and sandstone B1, sandstone B2, Sandstone B3 and sandstone B4 were infiltrated by TEMPO aqueous solution, and after the infiltration was completed, each sandstone was removed and the residual water on the surface of each sandstone was erased;
[0056] 3. Conduct NMR experiments on sandstone B1, sandstone B2, sandstone B3 and sand...
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