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Determination method for potential well deep distribution of methane adsorption by coal

A method for measuring methane and a technology for methane, which can be used in analytical materials, instruments, etc., and can solve problems such as basic assumptions that cannot be fully matched, and difficulties in efficient exploitation of methane reserves and coalbed methane.

Active Publication Date: 2017-07-04
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] However, unlike artificial homogeneous adsorption materials, coal is a natural multi-component heterogeneous adsorbent. Due to the diversity of functional groups and side chains of macromolecular structures on the surface of micropores of different coal ranks, the fractal characteristics of pore surface morphology, and Due to various reasons such as the complexity of the mineral structure of the coal rock components in coal, the depth of the potential well for methane adsorption has obvious non-uniformity
This makes the coal reservoir not fully consistent with the basic assumption of uniform potential well adsorption in the ideal Langmuir equation
This has brought great difficulties to the assessment of methane reserves in coal reservoirs and the efficient exploitation of coalbed methane.

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  • Determination method for potential well deep distribution of methane adsorption by coal
  • Determination method for potential well deep distribution of methane adsorption by coal
  • Determination method for potential well deep distribution of methane adsorption by coal

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Embodiment Construction

[0041] The technical solutions of the present invention are clearly and completely described below through examples.

[0042] The steps of a method for measuring the potential well distribution of coal adsorbed methane are as follows:

[0043] Step 1, lump coal coal sample preparation:

[0044] In order to ensure that the pore structure of the original coal body is not damaged, a 10 mm × 10 mm × 10 mm cubic coal sample is cut from the target lump coal, cleaned and dried for later use.

[0045] Step 2, the adsorption capacity test of the coal sample under the adsorption pressure of multiple measuring points under different constant temperature conditions:

[0046] Put the coal sample into the constant temperature adsorption instrument, carry out vacuum treatment on the coal sample, and then adjust the temperature to T 1 = 20°C, put the coal sample to be tested, and keep at constant temperature for 1 hour to ensure the internal temperature balance of the coal sample. Set a to...

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Abstract

The invention relates to a determination method for potential well deep distribution of methane adsorption by coal, which relates to a method for evaluating methane reserves in a coal reservoir, due to characteristic of uneven potential well depth of methane adsorption by raw coal body, multi-measuring point adsorption measurements under adsorption pressure and different constant temperature conditions can be carried out on a block coal sample; by using a Langmuir equation based on adsorption kinetics, the adsorption rate parameter b under different constant temperature conditions and the corresponding temperature T enable fitting calculation to obtain a proportion constant bm, the methane adsorption quantity under each constant temperature condition and adsorption pressure are subjected to segment fitting, quantity of different depths of potential wells can be calculated, and a potential well distribution histogram in a certain depth scope can be drafted. The method can be used for realizing accurate calculation of methane adsorption capability under different temperature and pressure conditions on the coal body, and can be used for accurately evaluating the coal bed gas content of the coal reservoir.

Description

technical field [0001] The invention relates to an evaluation method of methane reserves in coal reservoirs, in particular to the segmental fitting of the methane adsorption amount and adsorption pressure at multiple adsorption pressure measuring points under different constant temperature conditions, to carry out the methane potential well depth and quantity distribution curve in coal A statistical method for the determination of the potential well distribution of methane adsorbed by coal. Background technique [0002] The adsorption and storage method of methane in coal is mainly physical adsorption; that is, the result of mutual attraction between methane molecules and coal molecules under the action of van der Waals force. Methane molecules in coal have two forms: adsorbed state and free state, and about 90% of the methane molecules are in the adsorbed state. According to the adsorption kinetics, the adsorption potential well refers to the position where the local poten...

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Application Information

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IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 周动冯增朝王辰赵东蔡婷婷赵阳升
Owner TAIYUAN UNIV OF TECH
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