Method for evaluating ultrasonic attenuation coefficient of coal rock based on fractal dimension

A technology of attenuation coefficient and evaluation method, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis and material analysis using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as difficulty in carrying out experiments and heavy workload, and achieve evaluation The effect of high accuracy, fast speed and less experimental data

Inactive Publication Date: 2019-04-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Using indoor experiments to evaluate the ultrasonic attenuation coefficient of coal rocks is a huge workload, and it is often difficult to carry out relevant experiments on the construction site. Therefore, a method that can quickly evaluate the acoustic attenuation coefficient of coal rocks for field work is needed

Method used

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  • Method for evaluating ultrasonic attenuation coefficient of coal rock based on fractal dimension
  • Method for evaluating ultrasonic attenuation coefficient of coal rock based on fractal dimension
  • Method for evaluating ultrasonic attenuation coefficient of coal rock based on fractal dimension

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Embodiment 1

[0088] A method for evaluating coal rock ultrasonic attenuation coefficient based on fractal and fractal dimensions, comprising the following steps:

[0089] A. Drill standard coal rock samples, and group coal rock samples according to the number of cleats, cleat density, and cleat development angle;

[0090] B. Construct the two-dimensional numerical models of each group of coal samples, and calculate the box dimension of each two-dimensional numerical model to

[0091] and attenuation coefficient;

[0092] C. Construct a box dimension calculation model based on the development of coal and rock cleats;

[0093] D. Analyze the correlation between the attenuation coefficient of the two-dimensional numerical model of coal and rock and the box dimension, and build an evaluation model for the attenuation coefficient based on the box dimension.

Embodiment 2

[0095] Based on the principle of the above-mentioned embodiment, this embodiment discloses a specific implementation manner, and the coal rock sample is taken from a certain work area in Yunnan.

[0096] A. Drill standard coal and rock samples. The standard coal and rock samples drilled are cylindrical, without obvious block, with flat end faces, and both ends are perpendicular to the core axis.

[0097] According to the cleat angle and cleat distribution, the standard rock samples are divided into three groups. In this embodiment, six coal rock samples are drilled and divided into three groups A, B, and C, such as Figure 1 to Figure 6 As shown, the coal rock samples are respectively recorded as A1, A2, B1, B2, C1, and C2. Among them, the cleats of the two coal samples in group A are evenly distributed, the number of cleats is different, and the cleat angles are similar; the cleats of the two coal samples in group B are evenly distributed, the cleat densities are not equal, a...

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Abstract

The invention discloses a method for evaluating the ultrasonic attenuation coefficient of a coal rock based on fractal dimension. The method is characterized by comprising the steps of: drilling and obtaining standard coal rock samples, and grouping the coal rock samples according to the cleat number, the cleat density and the cleat development angle; constructing two-dimensional numerical modelsof various groups of coal rock samples, and calculating the box dimension and the attenuation coefficient of each two-dimensional numerical model; constructing a box dimension calculation model basedon the cleat development condition of the coal rock; and, analyzing the correlational relationship of the attenuation coefficient of the two-dimensional numerical model of the coal rock and the box dimension, and constructing an attenuation coefficient evaluation model based on the box dimension. Fractal dimension is introduced; complex conditions of uneven cleat distribution, unequal cleat development density and different cleat and sound wave propagation directions are unified together, so that a new method for evaluating the acoustic attenuation of the coal rock is established; and the attenuation coefficient evaluation model determined in the method is high in evaluation accuracy, rapid in speed and less in required experimental data, and has very wide application prospect.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas resources, in particular to a method for evaluating the ultrasonic attenuation coefficient of coal rock based on fractal and fractal dimensions. Background technique [0002] The acoustic attenuation coefficient is an important parameter in the exploration and development of coalbed methane resources, and indoor ultrasonic testing is the most effective method for evaluating the acoustic attenuation coefficient of coal and rock. The development of cleats is one of the most significant characteristics of coal rocks. As a weak structure, cleats have a significant impact on the attenuation of coal-rock sound wave propagation. The development of cleats in coal rocks in different regions is often different, and their acoustic wave attenuation coefficients are also different. . The workload of evaluating the ultrasonic attenuation coefficient of coal rock by indoor exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11G01N29/44
CPCG01N29/11G01N29/4418G01N2291/015
Inventor 刘向君侯连浪张平梁利喜李丹琼程璐
Owner SOUTHWEST PETROLEUM UNIV
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