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System and method for accurately measuring dynamic change of porosity of loaded coal rock

A technology of dynamic change and porosity, applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as high maintenance and operating conditions, low measurement accuracy, and increased measurement error

Active Publication Date: 2015-01-07
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) At present, some methods of measuring coal porosity use water immersion, and the measurement accuracy is low. Due to the effect of liquid surface tension, the liquid cannot fully immerse into small pores, which increases the measurement error
[0005] (2) Using methods such as 3D imaging, the equipment is expensive, and the maintenance and operating conditions are high, so it is rarely used in actual measurement
[0006] (3) Using the true and false density method to measure, the coal rock needs to be ground into powder, and the tested coal rock sample can no longer be used for other determinations such as mechanical properties, and there are also major limitations
[0007] (4) The previous coal-rock porosity measurement system cannot realize the dynamic porosity measurement function under the action of external loads. In actual production, coal rocks are in various stress fields such as gravity field and tectonic stress field, so external loads must be considered. In order to study the porosity of coal rock more realistically and reliably

Method used

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  • System and method for accurately measuring dynamic change of porosity of loaded coal rock
  • System and method for accurately measuring dynamic change of porosity of loaded coal rock
  • System and method for accurately measuring dynamic change of porosity of loaded coal rock

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Embodiment 1

[0031] Such as figure 1 As shown, a system for accurately measuring the dynamic change of the porosity of loaded coal rocks includes a triaxial pressure chamber 23 and a triaxial servo press 22, the upper pressure head 8 of the triaxial servo press 22, the lower pressure The head 9 is located in the triaxial pressure chamber 23, which also includes a heat-shrinkable tube 13 between the upper pressure head 8 and the lower pressure head 9 for loading the coal rock sample 12; the bottom end of the upper pressure head 8, The top of the lower pressure head 9 is respectively blocked on the top and bottom of the heat shrinkable tube 13, the bottom surface of the upper pressure head 8 is provided with a first porous plate 10, and the top surface of the lower pressure head 9 is provided with a second porous plate 11 , the upper pressure head 8 is provided with an upper air channel, and the lower pressure head 9 is provided with a lower air channel, the upper air channel communicates w...

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Abstract

The invention discloses a system and a method for accurately measuring the dynamic change of the porosity of loaded coal rock. The system comprises a vacuum-pumping device, a helium supply device, a porosity measurement device, a porosity variation measurement device and a three-axis servo press used for applying load. The system is capable of accurately measuring the dynamic change of the porosity of the coal rock under the loading condition, and can be used for accurately measuring the porosity of the coal rock sample under the specific load and accurately measuring the dynamic change of the porosity of the coal rock sample in the loading process.

Description

technical field [0001] The invention belongs to the technical field of measuring the porosity of loaded coal rocks, and in particular relates to a system and method for accurately measuring the dynamic changes in the porosity of loaded coal rocks, which is suitable for safe mining of coal resources, development of coal bed methane, oil, natural gas, etc. The field laboratory measures the porosity of coal and rock, and studies the change law of coal and rock porosity with load. Background technique [0002] my country is rich in coal resources, and coal contains a large amount of gas. Whether it is to prevent and control coal seam gas as a disaster factor, or to develop and utilize gas as a resource, it is necessary to study the law of gas migration in coal rocks. Coal rock is a typical porous material, and gas flows along the pores in coal rock. Under the action of external load, the coal rock mass deforms, which causes the corresponding deformation of the channel through w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N7/10
Inventor 王登科魏建平李志强夏玉玲刘勇彭明付启超王洪磊
Owner HENAN POLYTECHNIC UNIV
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