A method for detecting the displacement front of carbon dioxide flooding
A carbon dioxide and detection method technology, applied in the direction of measuring devices, material analysis using sound waves/ultrasonic waves/infrasonic waves, instruments, etc., can solve problems such as deviations in measurement results, high experimental costs, penetration capabilities, and radiation protection limitations, and achieve Strong penetrating ability, good linearity and fast effect
Inactive Publication Date: 2018-08-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
The two methods of CT method and NMR method have the characteristics of high experimental cost, not suitable for frequent use, etc., and are limited by penetration ability and radiation protection, and have strict restrictions on the size of the experimental model, experimental environment, experimental materials and experimental procedures.
The microwave method is only suitable for low water saturation, and at high saturation due to the interaction between the solvent and the absorbent and the change of the refractive index with the saturation, the measurement results often deviate, and it is not suitable for gas Case
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[0024] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0025] Such as Figure 1 to Figure 7 Shown, a kind of detection method of carbon dioxide flooding displacement front of the present embodiment, described method comprises:
[0026] Obtaining the arrival time of the first wave at the same position of the rock core at different times through an ultrasonic probe; the arrival time of the first wave is directly read out by an ultrasonic instrument and software, and the calculation formula for obtaining the arrival time of the first wave through the software belongs to the prior art.
[0027] Based on the known core height, calculate the average speed of sound at the same position of the ultrasonic probe at different times;
[0028] Arrange the average speed of sound at the same position at different times in chronological order and connect them through curves;
[0029] Based on the curve obtained for the mean ve...
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The invention relates to a method for detecting the displacement front of carbon dioxide flooding. It includes obtaining the arrival time of the first wave at the same position of the rock core at different times through the ultrasonic probe; calculating the average sound velocity at the same position of the ultrasonic probe at different times based on the known core height; , and connected by a curve; based on the obtained average sound velocity curve, find the abrupt point of the curve; the time point corresponding to the abrupt point is the time point when the gas displacement front reaches the position measured by the ultrasonic probe. This detection method is a non-intrusive method, which does not affect the fluid distribution inside the core; and has better linearity; compared with the CT method and NMR method, this detection method has strong penetration ability, fast speed, low cost, and is safe and harmless ; Compared with the microwave method, this detection method is suitable for gas detection, and the measurement results are not prone to deviation.
Description
technical field [0001] The invention relates to a method for detecting the displacement front of carbon dioxide flooding. Background technique [0002] For low permeability reservoirs, supercritical CO 2 Compared with ordinary gas flooding and water flooding, flooding has more obvious technical advantages, supercritical CO 2 It has gas-like diffusivity and liquid solubility, and has the characteristics of low viscosity and low surface tension, making supercritical CO 2 The fluid can quickly penetrate into the core of the pores, improve the oil-water mobility ratio, and thus greatly increase the recovery factor. At the same time, CO in the atmosphere 2 Sequestration in the ground can reduce the impact of greenhouse gases on the atmospheric environment. Therefore, supercritical CO 2 flooding in enhanced oil recovery and CO 2 Underground storage has great application prospects, in-depth research on supercritical CO 2 The seepage law and oil displacement mechanism of the ...
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IPC IPC(8): G01N29/024
CPCG01N29/024G01N2291/02433
Inventor 华陈权车新跃杨毅森邢兰昌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)