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Method for correcting gas loss volume of coal rock or shale

A calibration method and gas volume technology, applied in shale experiments and coal and rock fields, can solve problems such as accurate measurement of natural gas loss, algorithm or correction method correction without loss of gas volume, and error, so as to achieve accurate loss of gas volume and solve inaccurate measurement and calculation. or incalculable effects

Inactive Publication Date: 2018-09-18
PETROCHINA CO LTD
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Problems solved by technology

However, none of the gas loss measurement methods in the prior art can accurately measure the loss of natural gas, so there is a large error in the gas loss measurement method
[0004] However, there is no method for correcting the algorithm or correction method for the loss of gas volume in the prior art

Method used

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  • Method for correcting gas loss volume of coal rock or shale
  • Method for correcting gas loss volume of coal rock or shale
  • Method for correcting gas loss volume of coal rock or shale

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0028] see figure 1 and figure 2 As shown, according to an embodiment of the present invention, a method for correcting gas loss in coal or shale is provided, comprising the following steps:

[0029] Step S10: Injecting natural gas and water into the pressure vessel provided with the coal rock or shale sample, and making the pressure in the pressure vessel reach a predetermined value;

[0030] Step S20: Control the pressure in the pressure vessel through the back pressure valve set on the pressure vessel, so that the pressure in the pressure vessel is gradually reduced to the atmospheric pressure value within the first predetermined time; The back pressure valve on the pressure vessel is used to control the pressure in the pressure vessel, so that the pressure in the pressure vessel...

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Abstract

The embodiments of the present application disclose a method for correcting the gas loss volume of coal rock or shale. The method comprises: injecting natural gas and water into a pressure container,and making the pressure in the pressure container achieve a predetermined value; controlling the pressure in the pressure container; controlling the pressure in the pressure container to make the pressure in the pressure container maintain at an atmospheric pressure within a second predetermined time; measuring to obtain a gas loss volume, a desorbed gas volume and a residual gas volume; calculating according to the gas loss volume, the desorbed gas volume and the residual gas volume to obtain the proportion coefficient of the gas loss volume; and changing the parameter of the first predetermined time and / or the second predetermined time and circulating the step to obtain the corresponding proportion coefficient of the gas loss volume at different first predetermined time and / or second predetermined time. With the method of the present invention, the problem that the measurement of the gas content is inaccurate or the gas content cannot be calculated due to the long loss time on the site can be solved according to the relationship between the proportion coefficient of the gas loss volume and the first predetermined time and the second predetermined time.

Description

technical field [0001] The invention relates to the technical field of coal rock and shale experiments, in particular to a method for correcting gas loss in coal rock or shale. Background technique [0002] In the prior art, in determining the gas loss measurement method of coal rock or shale, standard methods such as formulas are used for measurement, or a mathematical model with fixed motion is used for determination, such as patent [0003] CN104863579B. However, none of the gas loss measurement methods in the prior art can accurately measure the loss of natural gas, so there are large errors in the gas loss measurement methods. [0004] However, there is no method for correcting the algorithm or correction method for the lost gas volume in the prior art. By obtaining the lost gas volume, a more accurate estimate can be made on the amount of coal or shale that can be mined. Contents of the invention [0005] Embodiments of the present invention provide a novel method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00G01N7/14
CPCG01N7/00G01N7/14
Inventor 邓泽田文广孙粉锦何东博李贵中
Owner PETROCHINA CO LTD
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