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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

Active Publication Date: 2015-01-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for quantitatively evaluating the oil washing effect of cores using nuclear magnetic resonance technology, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the existing The quantitative inspection method of the core oil washing effect is time-consuming, complicated, and inefficient, and the damage to the core will seriously affect the follow-up experimental measurement of the core.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of rock core oil washing effect evaluation, and in particular relates to a method for quantitatively evaluating the oil washing effect of a rock core by using a nuclear magnetic resonance (NMR) technology. The method comprises the following steps: (1) volatilizing an oil washing solvent and drying; (2) measuring gas porosity and gas void volume; (3) measuring the NMR T2 spectrum of the rock core and the NMR T2 spectrum of a standard sample; (4) obtaining residual oil volume; (5) obtaining residual oil porosity; and (6) obtaining residual oil saturation, thereby evaluating the oil washing effect of the rock core. According to the method, the time of a measurement process is short, and the efficiency of measurement is effectively improved; during measurement, the measurement is non-contact and non-destructive measurement, no damage to the rock core can be caused, and the measured rock core cannot affect the subsequent experiment measurement of the rock core; meanwhile, quantitative parameters, such as the porosity of the rock core, the residual oil volume, the residual oil porosity, the residual oil saturation and the NMR T2 spectrum of residual oil, can be simultaneously obtained, so that the applicable range is wide.

Description

technical field [0001] The invention relates to the technical field of evaluating the oil-washing effect of rock cores, and relates to a method for quantitatively evaluating the oil-washing effect of rock cores by using nuclear magnetic resonance technology. Background technique [0002] At present, the inspection method of core oil washing effect at home and abroad is usually the fluorescence analysis method, which can be divided into qualitative and quantitative analysis methods according to its accuracy. The principle is to use a fluorescence analyzer to detect the fluorescence color and intensity of rock samples, cuttings, or organic solvents soaked in rock samples, and evaluate the residual oil content qualitatively or quantitatively based on comparison with standard samples; in addition, there are indirect measurements Particle density comparison method, this method has strict requirements on lithology, large error, and poor applicability. In the fluorescence analysis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 王雪亮高秋涛姚万鹏房涛陈海波王新云
Owner BC P INC CHINA NAT PETROLEUM CORP
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