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Calculation method of flow process of single-component gas in anisotropic coal seam

An anisotropy and flow process technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of not considering the anisotropy of coal seams, and the inability to simulate mixed gas pressure injection to enhance coalbed methane mining, etc., to achieve numerical simulation Effect

Active Publication Date: 2018-06-12
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Therefore the program can only simulate pure CO 2 Pressure injection enhances coalbed methane recovery, but cannot simulate mixed gas (such as CO 2 and N 2 mixed gas) pressure injection to enhance coalbed methane recovery
[0010] The above prior art has at least the following disadvantages: the anisotropy of the coal seam is not considered and all are developed by foreign companies or institutions

Method used

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  • Calculation method of flow process of single-component gas in anisotropic coal seam
  • Calculation method of flow process of single-component gas in anisotropic coal seam
  • Calculation method of flow process of single-component gas in anisotropic coal seam

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specific Embodiment approach

[0036] The calculation method of the single-component gas flow process in the anisotropic coal seam of the present invention, its preferred embodiment is:

[0037] include:

[0038] The model expression of gas flow governing equation in coal is:

[0039]

[0040] In the formula:

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057] Neglecting the infinitesimal term in Equation 4.73 gives:

[0058]

[0059] In any time step, the Gauss-Seidel iteration format for solving Equation 4.90 is:

[0060]

[0061] where i is the ith iteration step.

[0062] According to the following basic assumptions:

[0063] Coal contains double pores, which are joints with larger size and pores with smaller size. The gas moves laminarly in the joints, and its motion law conforms to Darcy's law. The gas diffuses in the coal matrix, and its mot...

specific Embodiment

[0071] Basic assumptions:

[0072] Coal contains double porosity, which are joints with larger size and pores with smaller size. The gas moves laminarly in the joints, and its motion law conforms to Darcy's law. The gas diffuses in the coal matrix, and its movement law conforms to Fick's law.

[0073] Coal only contains single-component gas, which exists in the free state in the joints and pores, and exists in the adsorbed state on the surface of the joints and pores.

[0074] The gas in the joint is a Newtonian fluid, and its motion law conforms to Newton's law of viscosity.

[0075] All physical processes of gas in coal (including laminar flow, diffusion, adsorption and desorption) are isothermal processes.

[0076] The adsorption and desorption of gas in coal conform to the Langmuir isotherm adsorption equation, and the adsorption and desorption are reversible processes.

[0077] The solid skeleton of coal is immobile and its deformation velocity is zero.

[0078] The in...

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Abstract

The invention discloses a method for calculating a flow process of single-component gas in an anisotropic coal seam. A model expression of a flow control equation for gas in coal is defined in the specification. The anisotropy of the coal seam is fully considered, so that numerical simulation of the flow process of the single-component gas in the anisotropic coal seam is realized.

Description

technical field [0001] The invention relates to a calculation method for simulating gas flow in coal, in particular to a calculation method for single-component gas flow process in anisotropic coal seam. Background technique [0002] At present, there are three types of computer programs for simulating gas flow in coal, namely commercial programs specially used for numerical simulation of coalbed methane mining, non-commercial programs independently developed by researchers for numerical simulation of coalbed methane mining, and COMSOL multiphysics Field coupling simulation program. The main function of the first two types of programs is to carry out numerical simulation and prediction of coalbed methane mining, and to analyze the sensitivity of coalbed methane mining to different parameters, that is, to perform sensitivity analysis (Sensitivity Analysis). Since COMSOL has a powerful PDE solution function and can directly solve partial differential equations, this program c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 王凯臧杰吴雅琴
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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