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Identification method for moisture wetting front in rock and soil medium, and verification system thereof

A technology of geotechnical medium and identification method, which is applied in the field of infrared radiation feature application and geotechnical medium research, and can solve the problems of lack of universality and generalization of moisture migration and wetting front.

Active Publication Date: 2018-10-12
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for identifying the wetting front of water in rock-soil media, so as to solve the problem in the prior art that there is no universal and generalizable theoretical method for describing the wetting front of water migration in rock-soil media

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  • Identification method for moisture wetting front in rock and soil medium, and verification system thereof
  • Identification method for moisture wetting front in rock and soil medium, and verification system thereof
  • Identification method for moisture wetting front in rock and soil medium, and verification system thereof

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Embodiment Construction

[0071] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0072] In the present invention, as Figure 8 As shown, it is necessary to obtain an infrared thermal image and a criterion parameter, and then compare the two. Specifically, it is first necessary to establish the relationship equation between infrared radiation temperature and water content in unsaturated porous media. In order to describe more clearly how to establish this relationship equation, the first law of thermodynamics is quoted as follows:

[0073]

[0074] In the formula, is the total energy of the system; is the heat absorbed by the system from the outside; The work done by the system to the outside world;

[0075] Taking a hexahedral micro-control volume in the unsaturated porous rock-soil medium, the total energy of the micro-body per unit time:

[0076]

[0077] in, is the internal energy per unit mass ...

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Abstract

The invention provides an identification method for the moisture wetting front in a rock and soil medium, and a verification system thereof. The identification method comprise the following steps: calculating a value according to a formula shown in the description, wherein T is the temperature, k is the unsaturated permeability coefficient, hc is the maximum capillary rise height, hm is the matrixsuction head at a micro-control body in water-bearing rock soil, and xyz is the coordinate; and obtaining the infrared radiation thermogram of the water-bearing rock soil by using an infrared thermalimager, and regarding the position, meeting the formula, in the infrared radiation thermogram as the position of the moisture wetting front. A quantitative description equation of the infrared radiation temperature and the water content of the water-bearing rock is derived, and the identification formula of the moisture wetting front is derived based on the equation, so the method is simple, andcan be widely applied.

Description

technical field [0001] The invention relates to the technical fields of infrared radiation feature application and rock-soil medium research, in particular to a method for identifying a moisture front in rock-soil medium. Background technique [0002] In the field of oil and gas production, oil and gas displacement is one of the effective methods to enhance oil recovery. Monitoring the displacement front plays an important role in judging the flow direction, seepage velocity, and reservoir connectivity of gas in the reservoir, and has great influence on oilfields. Gas injection dynamic monitoring plays an important guiding role; in coal mine gas control, high-pressure air displacement of coal seam gas is one of the effective measures to eliminate coal and gas outburst accidents, and the displacement front is the displacement front of high-pressure gas. The movement characteristics of the front can obtain the development of fractures in the coal seam, the permeability, and th...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/246
Inventor 张芳张秀莲付成功
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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