Core oil/water calibration method based on nuclear magnetic resonance transverse relaxation spectrum line

A technology of nuclear magnetic resonance and transverse relaxation, which is used in the analysis of nuclear magnetic resonance, material analysis through resonance, and measurement devices.

Active Publication Date: 2019-11-01
SHANGHAI UNIV
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  • Abstract
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  • Core oil/water calibration method based on nuclear magnetic resonance transverse relaxation spectrum line
  • Core oil/water calibration method based on nuclear magnetic resonance transverse relaxation spectrum line
  • Core oil/water calibration method based on nuclear magnetic resonance transverse relaxation spectrum line

Examples

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Embodiment 1

[0033] see Figure 1 to Figure 5 , this example is based on the core oil / water calibration method of nuclear magnetic resonance transverse relaxation lines. The corresponding relationship between the resonance T2 relaxation signal peak area is tested, that is, the calibration result of the oil / water mass or volume and the signal amplitude is obtained more accurately without affecting the experimental operation process, and the calibration is realized; the specific implementation steps as follows:

[0034] 1) Clean and dry the experimental core, and weigh the mass of the dry core in m R0 And use the gas porosity tester to test the core pore volume V 0 ;

[0035] 2) Turn on the industrial computer of the nuclear magnetic resonance displacement device and preheat;

[0036] 3) Put the dry core into the holder, load the appropriate ring pressure and adjust the parameters of the nuclear magnetic resonance instrument, and perform a T test on the core base. 2 Spectrum test, inver...

Embodiment 2

[0050] see Figure 1 to Figure 5 and Table 1 to Table 3.

[0051] Table 1 Core Physical Property Parameters

[0052]

[0053] Table 2 NMR T2 spectral line peak area and saturation S 1 -14 The relationship between weighing and water quality in the process of drying core

[0054] Duration (min) weighing (g) Water content (g) Peak area 1.00 82.470 0.000 640.000 3.00 83.156 0.686 1356.600 4.00 83.510 1.040 1618.485 6.00 84.922 2.452 2764.481 saturation 95.604 13.134 9647.394

[0055] Table 3 The relationship between the oil peak area of ​​the NMR T2 spectrum and the volume of diesel oil produced and the volume of oil in the displacement process

[0056]

[0057] This example is an oil / water calibration method for heterogeneous core water flooding and foam flooding.

[0058] 1. For the experimental core (code S 1 -14) wash and dry, weigh dry core quality m R0 =82.47g and utilize the gas porosity tester to test the ...

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Abstract

The invention relates to a core oil/water calibration method based on a nuclear magnetic resonance transverse relaxation spectrum line (see Fig. 1 for the block diagram of the operation procedure). According to the method, in the process of saturating a core with oil/water before a core flooding experiment, the corresponding relationship between the oil/water mass or volume in the core and the peak area of a nuclear magnetic resonance T2 relaxation signal is tested, that is, a more accurate calibration result of the oil/water mass or volume and the signal amplitude is obtained without affecting the experimental operation procedure, so that the calibration is achieved. By using the calibration result, the change of the oil/water mass or volume in the core can be directly obtained by testingthe T2 relaxation spectrum line in the core flooding process, and the mass/volume and the recovery ratio of the produced oil/water can be further determined. According to the scheme of the invention,the key information of a nuclear magnetic resonance core flooding experiment is calibrated in real time based on the nuclear magnetic resonance T2 relaxation spectrum and the actual core flooding experiment, so that the accuracy and reliability of the experimental data can be improved, and the interference to the subsequent core flooding experiment cannot occur.

Description

technical field [0001] The invention relates to a core oil / water calibration method based on nuclear magnetic resonance transverse relaxation spectrum lines, and belongs to the technical field of chemical flooding enhanced recovery in petroleum engineering. Background technique [0002] In the middle and late stage of oilfield development, tertiary oil recovery technology is usually used to enhance the recovery factor. In the field of petroleum engineering, the core indoor displacement experiment is mainly carried out to evaluate the injection-production effect, that is, the water / oil saturation of the core is used to evaluate the displacement effect of the core. The content and distribution of crude oil and water in the core, as well as the flow law, can reflect the physical parameters of the reservoir pores, the distribution of residual oil, and determine the injection-production method. However, since the core is an opaque material, the actual data is difficult to measur...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081G01N24/082Y02A90/30
Inventor 王文昌狄勤丰贾欣昌陈锋狄锐李原杨培强
Owner SHANGHAI UNIV
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