Mud shale isothermal adsorption experiment curve correction method and mud shale isothermal adsorption experiment curve correction apparatus

A technology of isothermal adsorption and experimental curve, applied in the direction of analyzing materials, instruments, etc., can solve problems such as deviation

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[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 adsorptio

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  • Mud shale isothermal adsorption experiment curve correction method and mud shale isothermal adsorption experiment curve correction apparatus
  • Mud shale isothermal adsorption experiment curve correction method and mud shale isothermal adsorption experiment curve correction apparatus
  • Mud shale isothermal adsorption experiment curve correction method and mud shale isothermal adsorption experiment curve correction apparatus

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[0029] First embodiment

[0030] Please refer to figure 2 This embodiment provides a method for correcting shale isotherm adsorption experimental curve, which is applied to a device for correcting shale isotherm adsorption experimental curve, and the method includes:

[0031] Step S200: Based on the filling influence of the methane adsorption phase volume on the free space volume, obtain the excess adsorption amount of methane gas at each pressure point;

[0032] In this embodiment, the excess adsorption of methane gas at each pressure point is an expression related to the free space volume of a sample tank filled with a shale sample. The inventor of this scheme found in 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 In the past, when using the existing calculation method, the free space volume...

Example

[0064] Second embodiment

[0065] Please refer to Figure 8 This embodiment provides a shale isotherm 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 influence of the methane adsorption phase volume on the free space volume;

[0067] The conversion module 820 is configured to obtain the absolute adsorption amount of methane gas at each pressure point based on the excess adsorption amount of methane gas at each pressure point;

[0068] The fitting calculation module 830 is configured to obtain the free space volume, Langmuir volume, and Langmuir pressure by fitting calculation according to the gas pressure of the methane gas and the absolute adsorption amount.

[0069] Please refer to Picture 9 In this embodiment, specifically, the measurement module 810 may include the following units:

[0070] The setting unit 811 is used to se...

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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. . Therefore, the existing shale isothermal adsorption experiments cannot correctly obtain the amount of gas adsorbed by shale. Contents of ...

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Application Information

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IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 方帆孙冲朱忠云庄丽张倩倩喻燕平方子和
Owner CHINA PETROLEUM & CHEM CORP
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