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Method for determining relative permeability of rocks

A relative permeability, permeability technology, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve problems such as the inability to quickly and accurately determine the relative permeability of rocks

Active Publication Date: 2018-08-24
HOHAI UNIV
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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problem that the relative permeability of rock cannot be determined quickly and accurately in the prior art, the present invention provides a method for determining the relative permeability of rock, which can accurately and quickly determine the relative permeability of rock under the condition of specific water saturation Rate

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  • Method for determining relative permeability of rocks
  • Method for determining relative permeability of rocks
  • Method for determining relative permeability of rocks

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Embodiment

[0039] Taking the sandstone sample as an example, the relative permeability of the rock sample is determined by the following steps:

[0040] Step 1: Sandstone samples are taken from the same block, which are standard cylinder samples of Φ50mm×50mm, and prepared into rock samples with different water saturations. The water saturation of each rock sample is shown in Table 1.

[0041] Table 1 Water saturation of each rock sample

[0042]

[0043] Step 2: Using the tight rock material gas permeability test device disclosed by the applicant in the invention patent No. ZL201340085675.6, titled "A tight rock material gas permeability test device and calculation method", set the rock sample In the pressure chamber, control the confining pressure loading system to load the confining pressure to the preset value of 1Mpa;

[0044] Step 3: After the confining pressure is stabilized, control the air pressure loading system to introduce argon gas to apply gas osmotic pressure. The osmo...

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Abstract

The invention discloses a method for determining relative permeability of rocks. The method comprises the following steps: (1) preparing rock samples with different water saturation; (2) applying confining pressure to the rock samples to a preset value, applying gas permeation pressure after the confining pressure is stable, then maintaining the permeation pressure constant and loading the confining pressure step by step, and measuring and recording the gas effective permeability of the rock samples with different water saturation under specific permeation pressure and different confining pressure; (3) calculating the gas measuring relative permeability of the rock samples with different water saturation under different confining pressure, drawing the curve relationship between the water saturation and the relative permeability, and obtaining the function relationship between the water saturation and the relative permeability through curve fitting, so as to determine the relative permeability of the rocks under specific water saturation. The effective permeability under different confining pressure is measured by loading the confining pressure step by step, so that the relative permeability is calculated, and the functional relationship between the water saturation of the rock samples and the relative permeability is constructed, and the relative permeability of the rocks can be determined conveniently and accurately.

Description

technical field [0001] The invention relates to a method for determining rock permeability, in particular to a method for determining relative rock permeability, which belongs to the field of rock engineering. Background technique [0002] In the field of geotechnical engineering, the existence of seepage field has a significant impact on rock mechanical properties, and the problem of gas-liquid two-phase flow in porous media has always been a hot spot of concern. At the same time, in the mining of coalbed methane and shale gas and the disposal of nuclear waste, the relative permeability of gas seriously affects the mining efficiency of coalbed methane and shale gas and the safety of nuclear waste disposal, while the water saturation in rocks has a great impact on gas Relative permeability has a more significant effect. Therefore, it is particularly important to accurately measure the gas relative permeability of rocks with different water saturations. [0003] The key to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 王环玲刘士奇徐卫亚贾朝军向志鹏姜自华王震程志超
Owner HOHAI UNIV
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