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Method for calculating thermal conductivity of sandstone by utilizing the mineral components

A technology of mineral composition and thermal conductivity, which is used in material analysis using wave/particle radiation, analysis of materials, and thermal conductivity of materials. It can solve problems such as spatial layout damage and thermal conductivity errors, and avoid thermal conductivity Numerical, rock thermal conductivity data is accurate, the effect of reducing research funding

Active Publication Date: 2020-11-17
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the calculation basis of these commonly used mathematical methods is based on the fact that the minerals that make up the sandstone are regularly arranged in the sandstone, and when the mineral data in the sandstone are obtained experimentally, the minerals in the sandstone are in the original spatial arrangement and geometric combination relationship, However, since the more commonly used modern experiments to obtain mineral composition data in sandstones are geochemical methods: the spatial layout of mineral particles in sandstones is completely destroyed, so there are certain limitations in using these mathematical models to calculate the thermal conductivity of sandstones. error

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  • Method for calculating thermal conductivity of sandstone by utilizing the mineral components
  • Method for calculating thermal conductivity of sandstone by utilizing the mineral components
  • Method for calculating thermal conductivity of sandstone by utilizing the mineral components

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Embodiment Construction

[0030] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The main calculation steps of the present invention are as follows:

[0032] Step 1. Wash the collected sandstone samples to remove the floating soil and other substances on the surface of the samples, so as not to affect the later XRD laboratory measurement of sandstone minerals.

[0033] Step 2, put the clean sandstone sample into a vacuum drying oven for vacuum drying at a drying temperature of 50°C. The drying time needs to be more than 24h, until the weight of the sample no longer changes.

[0034] Step 3, taking out the dried sample, crushing, crushing, and taking out and classifying the mineral particles therein.

[0035] Step 4, using the Archimedes buoyancy method to measure the density value ρ of each mineral in the sample:

[0036]

[0037] In the formula, ρ sample is the density of the sample to be tested, w...

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Abstract

According to the method for calculating the thermal conductivity of the sandstone by utilizing the mineral components, the thermal conductivity value of the sandstone is predicted and calculated by utilizing existing mineral data, so that the measurement of the thermal conductivity value of a drilled sample is avoided, and the research expenditure in research work such as geodetic heat flow is reduced; according to the method, the thermal conductivity value of the sandstone is calculated by utilizing the volume content percentage of minerals in the sandstone, so that the phenomenon that weightpercentage data measured by an XRD (X-Ray Diffraction) experiment does not accord with the mineral content of a traditional thermal conductivity prediction model is avoided; according to the method,the rock thermal conductivity data is calculated by utilizing the density of the sample minerals, and experimental data is more accurate than original rock thermal conductivity data calculated by utilizing the general density value of the minerals and conforms to actual conditions.

Description

technical field [0001] The invention relates to the technical field of calculating the thermal conductivity of sandstone, in particular to a method for calculating the thermal conductivity of sandstone by using mineral components. Background technique [0002] In the process of studying geothermal disasters in coal mining areas and geothermal resources in development areas, accurate calculation of sandstone thermal conductivity is of great significance for the later research on lithospheric geothermal, terrestrial heat flow, and rock conduction. The thermal conductivity of rocks determines the transfer efficiency and speed of the lithosphere in the process of heat conduction, and is the most important parameter in the thermodynamic properties of rocks. However, due to the limitations of the method of measuring the thermal conductivity of rocks in the laboratory, especially for the laboratory thermal conductivity measurement of drilling cuttings samples, it is difficult for e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18G01N9/08G01N23/207
CPCG01N25/18G01N9/08G01N23/207G01N2223/056G01N2223/1016
Inventor 吴财芳蒋秀明
Owner CHINA UNIV OF MINING & TECH
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