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Gas loss calculation method

A loss and gas technology, applied in the field of gas loss calculation, which can solve problems such as inaccuracy

Inactive Publication Date: 2014-08-13
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0027] Similarly, the power exponent method uses the desorption strength of the cuttings after a period of desorption to calculate the initial desorption strength of the cuttings just exposed, and the obtained power exponent k not accurate

Method used

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Embodiment 1

[0050] A gas loss calculation method, which includes the following steps:

[0051] 1) According to AQ1047-2007 "Direct Measurement Method of Gas Pressure in Underground Coal Seam of Coal Mine", the measured gas pressure is P=0.6MPa.

[0052] 2) Measure the coal seam gas content on site according to GB / T-23250 "Direct Determination Method of Coal Seam Gas Content Underground", and record the desorption time t (the time interval is 1min), and the cumulative desorption amount over time t V t (read the number every 1min),

[0053] Table 1 On-site gas desorption measurement table

[0054]

[0055] 3) Collect coal sample cuttings during drilling, wrap them in plastic bags and send them to the laboratory for corresponding adsorption and desorption tests; specifically:

[0056] Put the collected coal sample drilling cuttings into the adsorption system, pre-evacuate for 10h, then fill with methane to the coal seam gas pressure P=0.6MPa, and let the adsorption balance for 24h, s...

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Abstract

The invention relates to a method for calculating gas loss according to a relation between an accumulated desoprtion value and the time. A large quantity of experiments show that the relational equation between the accumulated desorption value in the initial stage after pressure of coal cuttings is released is V=A(t / T)<n>, but the power exponent n is not a constant, is related to the gas pressure and is changed along with the time; accurate determination of the power exponent n of the accumulated desorption value is a key for calculation of the gas loss. In order to accurately calculate the gas loss, the method comprises the steps of 1, firstly evaluating the gas pressure of a coal seam through on-site measurement; 2, recording the observation time t, the accumulated desorption value Vt with the time t, the total desorption time T and the loss time t0 during the on-site measurement of the gas content; 3, measuring the value of n in a lab under a condition of the gas pressure of the coal seam to be measured: obtaining a unitary regression relational equation between lnVt and ln[(t+t0)n-t0n] through Excel by a least square method, wherein an intercept is ln(A / Tn), and substituting the n value and the T value to obtain an A value; and 4, substituting the A value, the T value the n value into V=A(t0 / T)<n> to obtain the gas loss V.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas content measurement, and in particular relates to a gas loss calculation method. Background technique [0002] Coal seam gas content is one of the main parameters of coal seam gas, and it is an important basic parameter for mine ventilation design, gas emission prediction, gas outburst prediction, and gas drainage design. [0003] The gas content is composed of three parts: loss, desorption, and residual volume. The desorption volume and residual volume can be measured more accurately, while the gas loss volume is mainly calculated through the desorption law. The main calculation methods are: method and exponent method. [0004] Method: It is based on the exposure of the coal sample for a period of time t internal cumulative desorption V and It is determined in a linear relationship, that is: [0005] [0006] In the formula: a, b are undetermined constants, when =0, V = a, th...

Claims

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Application Information

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IPC IPC(8): G01N7/00
Inventor 史广山魏风清韩世英崔益鸣
Owner HENAN POLYTECHNIC UNIV
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