Detection method of carbon dioxide oil displacement displacing front

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 low cost

Inactive Publication Date: 2017-12-26
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 material

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  • Detection method of carbon dioxide oil displacement displacing front
  • Detection method of carbon dioxide oil displacement displacing front
  • Detection method of carbon dioxide oil displacement displacing front

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[0024] The present invention will be further described below in conjunction with the drawings and embodiments:

[0025] Such as Figure 1 to Figure 7 As shown, the method for detecting the front edge of carbon dioxide flooding in this embodiment includes:

[0026] The first wave arrival time at the same position of the core is obtained by an ultrasonic probe; the first wave arrival time is directly read by an ultrasonic instrument and software, and the calculation formula for obtaining the first wave arrival time through the software belongs to the prior art.

[0027] Based on the known height of the core, the average sound velocity at the same position of the ultrasonic probe at different times is calculated;

[0028] Arrange the average sound velocity at different moments at the same location in chronological order and connect them by curves;

[0029] Based on the obtained average sound velocity curve, find the mutation point of the curve;

[0030] The time point corresponding to the ...

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Abstract

The invention relates to a detection method of carbon dioxide oil displacement displacing front. The method comprises the following steps: obtaining the first wave arrival time of a same position of a rock core at different time by an ultrasonic probe; based on the known height of the rock core, calculating the average sound speed of the same position at different time; arranging the average sound speed of the same position at different time in a time order, connecting the points by a curve, based on the obtained average sound speed curve, and finding the change point of the curve; wherein the time point corresponding to the change point is the time point when the gas displacing front reaches the position detected by the ultrasonic probe. The detection method is a non-inserting method, does not affect the distribution of fluids in the rock core, and has better linearity. Compared with a CT method and a NMR method, the detection method has the advantages of stronger penetration performance, quicker speed, lower cost, more safety, and harmlessness. Compared with a microwave method, the detection method is suitable for gas containing detection, and the measurement results are more accurate.

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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Application Information

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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)
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