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Method for quantitatively characterizing content of open holes in coal

A quantitative characterization and open-pore technology, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem of inability to quantitatively characterize the entire area of ​​the hysteresis loop, incomplete data, and failure to consider mercury injection pressure compression Problems such as the rule of action change

Active Publication Date: 2020-08-11
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, their research is limited to the calculation of the hysteresis coefficient under a single pressure, and cannot quantitatively characterize the entire area of ​​the hysteresis loop; moreover, the compression effect of the mercury injection pressure on the coal matrix and the change law of the low-temperature liquid nitrogen adsorption curve are not considered in the calculation process , resulting in the calculated data not being able to completely and truly reflect the content of open pores in the coal

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  • Method for quantitatively characterizing content of open holes in coal
  • Method for quantitatively characterizing content of open holes in coal
  • Method for quantitatively characterizing content of open holes in coal

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Embodiment Construction

[0040] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments, which are only used to explain the present invention and do not limit the protection scope of the present invention.

[0041] like figure 1 As shown, a method for quantitatively characterizing the open pore content in coal includes the following steps,

[0042] Step 1: Carry out the mercury porosimetry test on the collected coal samples. The test uses the AutoPore-IV9500 automatic mercury porosimeter, and the test is carried out in accordance with the Chinese oil and gas industry standard SY / T 5346-2005. The test uses pure coal, which is uniformly broken into 1 -2mm; Before the test, the sample is dried to a constant weight in a drying oven, and then tested. During the test, the mercury injection pressure range of the instrument is 0.034-227.5MPa, and the corresponding pore diameter range is 5...

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Abstract

The invention discloses a method for quantitatively characterizing the content of open holes in coa. The method comprises the following steps of 1, carrying out mercury intrusion method test on a collected coal sample to obtain a corresponding mercury intrusion method hysteresis loop area and mercury injection and removal curves; 2, synchronously carrying out a low-temperature liquid nitrogen absorption / desorption test on the collected coal sample to obtain a corresponding low-temperature liquid nitrogen absorption / desorption hysteresis loop area and an absorption / desorption curve; 3, distinguishing an open hole type coal sample or an ink bottle hole type coal sample according to the hysteresis loop type of the low-temperature liquid nitrogen absorption / desorption curve obtained in the step 2; and 4, characterizing the open hole content of the coal with the corresponding hole diameter according to the hole type distinguishing result of the coal sample in the step 3 and the corresponding hole diameter. The method is advantaged in that the method can completely and accurately identify the content of the open holes in the coal, and can be applied to other unconventional natural gas reservoirs, such as shale gas reservoirs and sandstone gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of coal rock open pores measurement, in particular to a method for quantitatively characterizing the open pores content in coal. Background technique [0002] China is rich in coalbed methane resources, second only to Russia and Canada. Efficient mining of coalbed methane has important practical significance for ensuring safe production of coal mines and improving my country's energy structure. As a complex porous organic medium, coal is the carrier and migration channel of coalbed methane, which has a significant impact on the enrichment and development of coalbed methane. Effective pores in coal include two basic types: open pores and semi-closed pores. According to the mercury injection / removal curve and the "pore hysteresis loop" characteristics of low-temperature liquid nitrogen adsorption / desorption, the connectivity and basic shape of pores can be qualitatively Evaluation. [0003] Open pores have ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088G01N2015/0813
Inventor 杨兆彪张争光秦勇游振江赵俊龙李庚周斌扬
Owner CHINA UNIV OF MINING & TECH
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