Molecular simulation method for shale gas adsorption hysteresis phenomenon

A molecular simulation, shale gas technology, applied in the field of oil and gas exploration, can solve problems such as the influence of pore connectivity that cannot be considered

Active Publication Date: 2021-02-26
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Compared with GCMC simulation, this simulation method can realize the deformation of pore structure, but still cannot consider the in

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  • Molecular simulation method for shale gas adsorption hysteresis phenomenon
  • Molecular simulation method for shale gas adsorption hysteresis phenomenon
  • Molecular simulation method for shale gas adsorption hysteresis phenomenon

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[0041]The present invention will be further described below in conjunction with the drawings and embodiments.

[0042]In this example, the adsorption hysteresis of methane and carbon dioxide in the shale kerogen-quartz composite system is taken as an example to illustrate the specific implementation of the present invention.

[0043]according tofigure 1 The process shown:

[0044]S1. Simulation system initialization.

[0045]Construct the initial cuboid simulation box, the dimensions of the box in the x, y, and z directions are 45×45×400First, randomly put 15 IA-type kerogen molecules (C251H385O13N7S3), then randomly put 3 LJs with a diameter of 30 into the boxAnd 4 LJs with a diameter of 20Combine the upper end surface of the simulation box in the z direction with a graphite sheet, and combine the lower end surface of the box in the z direction with a quartz layer to form an initialized simulation system.

[0046]S2. Simulate system cohesion.

[0047]The graphite sheet in the initial system is used ...

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Abstract

The invention provides a molecular simulation method for a shale gas adsorption hysteresis phenomenon. The method comprises the following steps: S1, initializing a simulation system; S2, coagulating the simulation system; S3, modeling the simulation system; S4, obtaining the relationship between the shale gas chemical potential and the pressure; S5, setting a gas adsorption/desorption molecular simulation method; S6, simulating a shale gas adsorption process; S7, simulating a shale gas desorption process; and S8, performing shale gas adsorption hysteresis phenomenon analysis. By constructing the gas adsorption simulation device and combining with the proposed DCV-GCMD-F simulation method, the adsorption and desorption physical process of the reducing gas in the complex nano-pore structureof the shale can be maximized on the molecular scale, the adsorption hysteresis phenomenon of the supercritical gas obtained by experimental testing is reproduced, and the micromechanism of adsorptionhysteresis is explained. According to the technical scheme provided by the invention, the occurrence behavior and the desorption mechanism of the supercritical gas in the complex nano-pores of the shale can be found out, so that a theoretical basis is laid for the productivity potential tapping of the shale gas and the design of targeted production increasing measures.

Description

Technical field[0001]The invention relates to a molecular simulation method for shale gas adsorption hysteresis, and specifically belongs to the technical field of oil and gas exploration.Background technique[0002]Shale gas is rich in resources, has the characteristics of high heating value, easy storage and transportation, and environmental protection. It is one of the most important replacement resources for conventional oil and gas resources. However, the special reservoir conditions and seepage characteristics of shale gas reservoirs determine the characteristics of rapid natural decline and low natural productivity. At present, shale gas reservoirs are mostly developed in depletion, and the recovery rate is generally less than 30%. How to extract more shale gas from shale gas reservoirs is a hot and difficult point in current shale gas reservoir development research.[0003]Shale gas is mainly produced from the kerogen in shale. Kerogen is an amorphous organic matter, and its mac...

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Application Information

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IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 黄亮周文王璐徐浩周秋媚邹杰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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