A real shale gas adsorption prediction method based on molecular simulation

A technology of molecular simulation and prediction method, which is applied in the direction of material absorption weighing, specific gravity measurement, and material analysis, and can solve the problem of large gap between adsorption amount and experimental value

Active Publication Date: 2021-12-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a real shale gas adsorption prediction method based on molecular simulation, so as to solve the problem that molecular models cannot be used to effectively characterize the various mineral components, contents and structures of real shale in the prior art, and the established molecular models The technical problem that the difference between the calculated adsorption amount and the experimental value is too large

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  • A real shale gas adsorption prediction method based on molecular simulation
  • A real shale gas adsorption prediction method based on molecular simulation
  • A real shale gas adsorption prediction method based on molecular simulation

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Embodiment 1

[0119] Such as figure 1 As shown in , a real shale gas adsorption prediction method based on molecular simulation includes the following steps:

[0120] S1. Obtain mineral composition information in shale through XRD diffraction experiment, including the following sub-steps:

[0121] S101, powdering the shale sample, including the following processing methods:

[0122] (1) The oil-bearing shale samples should be washed and processed to a fluorescence level below level 4;

[0123] (2) Dry the shale samples at a temperature lower than 60°C, cool to room temperature, and pulverize them for use;

[0124] (3) Grind the crushed rock samples until the total particle size is less than 40 μm or there is no graininess when kneaded by fingers.

[0125] S102. Extracting the clay minerals in the rock sample and making slices, including the following processing methods:

[0126] (1) Put the powdered sample in a 40ml tall beaker, add 10ml of distilled water to soak, and use a CQX-25-06 (...

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Abstract

The invention discloses a real shale gas adsorption prediction method based on molecular simulation, which includes obtaining mineral composition information in shale through XRD diffraction experiment; obtaining organic component information in shale through TOC experiment; and performing shale gas adsorption experiment Obtain adsorption experiment data; use the obtained real shale composition information to construct a multi-substance mixture molecular model, and simultaneously establish a gas molecular model; simulate and calculate the real shale gas adsorption amount under different pressures and temperatures; compare the calculated shale gas The error between the adsorption amount and the actual shale gas adsorption amount tested by the experiment is calculated, and the shale gas adsorption amount under higher pressure is calculated; the influence of different water content and different carbon dioxide content on the shale gas adsorption amount is simulated and calculated. The invention comprehensively obtains the phase type and unit cell structure information of clay minerals in shale, the type of kerogen functional group and the proportion information of TOC content, so that the established shale molecular simulation is more in line with the real situation of shale formations.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for predicting real shale gas adsorption capacity based on molecular simulation. Background technique [0002] With the adjustment of the energy structure, shale gas is playing an increasingly important role as a clean energy source. However, as the storage matrix of shale gas, shale has complex structural components and various occurrence modes, which lead to unclear understanding of the microscopic adsorption mechanism of shale gas. Therefore, it is necessary to study the occurrence mode and adsorption capacity of shale gas. Currently, there are two methods used to study shale gas (mainly CH4) adsorption in shale matrices, namely experimental and simulation methods. The results obtained by the experimental method are highly reliable, but only the adsorption amount can be obtained, and the microscopic adsorption mechanism cannot be displayed. At the same t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/20008G01N23/2055G01N9/00G01N25/20G01N21/3504G01N5/02G16C10/00
CPCG01N23/20008G01N23/2055G01N9/00G01N25/20G01N21/3504G01N5/02G16C10/00
Inventor 刘建仪文义民余凡袁华
Owner SOUTHWEST PETROLEUM UNIV
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