Method for quantitatively evaluating oil washing effect of rock core by using nuclear magnetic resonance (NMR) technology
A nuclear magnetic resonance and quantitative evaluation technology, applied in the direction of nuclear magnetic resonance analysis, etc., can solve the problems of complex process, influence of core measurement, and time-consuming measurement process, and achieve the effect of short time, wide application range and improved measurement efficiency
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Embodiment 1
[0012] Embodiment 1, the method for quantitatively evaluating the oil washing effect of the rock core by nuclear magnetic resonance technology is carried out according to the following steps: the first step, after the oil washing of the rock sample to be tested is finished, first volatilize the remaining oil washing solvent on the rock sample to be tested , and then dry the rock sample to be tested until there is no moisture; the second step is to measure the gas pore volume of the rock sample to be tested and the total volume of the rock sample to be tested; the third step is to measure the NMR T of the rock sample to be tested respectively 2 Spectra and NMR T of standard samples 2 spectrum; the fourth step is to calculate the residual oil volume by the formula: residual oil volume=(a×V×RG×NS) / (A×rg×ns), where a is the nuclear magnetic resonance T of the standard sample 2 The area of the spectrum, V is the volume of the standard sample, RG is the receiving gai...
Embodiment 2
[0013] Embodiment 2, as the preference of above-mentioned embodiment, standard sample is known nuclear magnetic resonance T 2 Standard oil samples with spectral characteristics or actual oil samples from the same block as the rock samples to be tested.
Embodiment 3
[0014] Embodiment 3, as the preference of the above-mentioned embodiment, the specific operation method for volatilizing the remaining oil washing solvent on the rock sample to be tested is: placing the rock sample to be tested in a fume hood to volatilize the remaining oil washing solvent until it is ready to be tested. There is no residual oil washing solvent on the rock sample.
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