Shale isothermal adsorption experiment curve correction method and device
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A technology of isothermal adsorption and experimental curves, which is applied to the analysis of materials, instruments, etc.
Active Publication Date: 2021-03-23
CHINA PETROLEUM & CHEM CORP +1
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Therefore, the existing shale isothermal adsorption experiments cannot correctly obtain the amount of gas adsorbed by shale
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no. 1 example
[0030] Please refer to figure 2 , the present embodiment provides a method for calibrating the isothermal adsorption experiment curve of mud shale, which is applied to a device for calibrating the isothermal adsorption experiment curve of mud shale, and the method includes:
[0031] Step S200: Obtain the excess adsorption capacity of methane gas at each pressure point based on the filling effect of the methane adsorption phase volume on the free space volume;
[0032]In this embodiment, the excess adsorption amount of methane gas at each pressure point is an expression related to the free space volume of the sample tank filled with the shale sample. The inventors of this scheme found in the experimental research that because methane gas is adsorbed on the pores and surfaces of shale, the adsorption phase fills part of the pore space, that is, the free space volume of free gas is reduced, and the reduced volume is calculated When using the existing calculation methods, the vo...
no. 2 example
[0065] Please refer to Figure 8 , this embodiment provides a shale isothermal adsorption experiment curve correction device 800, which includes:
[0066] The measurement module 810 is used to obtain the excess adsorption amount of methane gas at each pressure point based on the filling effect of the methane adsorption phase volume on the free space volume;
[0067] A conversion module 820, configured to obtain the absolute adsorption capacity of methane gas at each pressure point based on the excess adsorption capacity of methane gas at each pressure point;
[0068] The fitting calculation module 830 is used to obtain the free space volume, Langmuir volume and Langmuir pressure through fitting calculation according to the gas pressure of the methane gas and the absolute adsorption amount.
[0069] Please refer to Figure 9 , in this embodiment, specifically, the measurement module 810 may include the following units:
[0070] The setting unit 811 is used to set the free sp...
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Abstract
The invention provides a mud shale isothermal adsorption experiment curve correction method and a mud shale isothermal adsorption experiment curve correction apparatus, and relates to the technical field of shale gas exploration and development. The mud shale isothermal adsorption experiment curve correction method comprises: obtaining the excess methane gas adsorption amounts under each pressurepoint based on the filling influence of a methane adsorption phase volume on a free space volume; obtaining the absolute methane gas adsorption amounts under each pressure point based on the excess methane gas adsorption amounts under each pressure point; and according to the methane gas pressure and the absolute methane gas adsorption amounts, carrying out fitting calculation to obtain the free space volume, the Langmuir volume and the Langmuir pressure. According to the present invention, the free space volume of the sample is not determined with helium gas, the excess adsorption amount is corrected by considering the influence of the methane adsorption phase volume on the free space volume, and the excess adsorption amount is distinguished from the absolute adsorption amount, such thatthe accurate mud shale isothermal adsorption experiment curve is obtained.
Description
technical field [0001] The invention relates to the technical field of shale gas exploration and development, in particular to a method and device for correcting a shale isothermal adsorption experiment curve. Background technique [0002] In recent years, with the exploration and development of unconventional shale gas reservoirs, the evaluation of methane adsorption gas content and reservoir capacity in shale gas reservoirs has become a necessary test item, and one of the methods is isothermal adsorption test. [0003] However, for shale, many methane adsorption curves obtained by existing measurements are abnormal, and the adsorption curve often turns downward, that is, the phenomenon of "inverted adsorption" or "negative adsorption" occurs in the middle and high pressure section, which deviates from the Langmuir theoretical curve. . The main reasons are problems with the free space volume measurement method and the failure to distinguish between excess and absolute adso...
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