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A Calculation Method of Critical Parameters and Phase Diagram of Fluid in Organic Pores of Shale Gas Reservoirs

A calculation method and technology of shale gas reservoirs, applied in calculation, computer-aided design, design optimization/simulation, etc.

Active Publication Date: 2022-05-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of equation only considers the pore size, ignoring the influence of pore shape

Method used

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  • A Calculation Method of Critical Parameters and Phase Diagram of Fluid in Organic Pores of Shale Gas Reservoirs
  • A Calculation Method of Critical Parameters and Phase Diagram of Fluid in Organic Pores of Shale Gas Reservoirs
  • A Calculation Method of Critical Parameters and Phase Diagram of Fluid in Organic Pores of Shale Gas Reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A calculation method for the critical parameter of C1 (methane) in the pores of organic matter in shale gas reservoirs, which is calculated according to the following steps (see Table 3 for the specific parameters used in the calculation):

[0082] S1: First obtain SEM images of shale reservoirs, such as figure 1 As shown, the image processing software Image J is used to extract the pores, and the extraction results are as follows: figure 2As shown, the ellipse fitting of irregular pores can obtain the fitted image and the parameters of each pore, including the fitted ellipse major axis and minor axis, such as image 3 As shown, the schematic diagrams of cylindrical pores and slit-shaped pores are derived from the prior art.

[0083] S2: Calculate the thickness of the adsorption layer of methane fluid, the calculation formula is as follows:

[0084]

[0085]

[0086]

[0087] in m , n is the coefficient; MW is the molecular weight; r p is the pore rad...

Embodiment 2

[0131] A method for calculating critical parameters and phase diagrams of multi-component fluids in organic matter pores in shale gas reservoirs, which is calculated according to the following steps:

[0132] S1: First obtain SEM images of shale reservoirs, such as figure 1 As shown, the pores were extracted using the image processing software Image J, and the extraction results are as follows: figure 2 As shown, the ellipse fitting of irregular pores can obtain the fitted image and the parameters of each pore, including the fitted ellipse major axis and minor axis, such as image 3 shown.

[0133] S2: Calculation of Adsorbed Layer Thickness for Multicomponent Fluids δ ad ,Calculated as follows:

[0134]

[0135]

[0136]

[0137]

[0138] in δ ad is the thickness of the adsorption layer of the multicomponent fluid, δ ad(i) for the first i The thickness of the adsorption layer of a component fluid, X i is the first i The mole fraction of each componen...

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Abstract

A method for calculating critical parameters and phase diagrams of fluids in organic pores in shale gas reservoirs. By fitting the molecular simulation results of existing circular pores and slit pores, the offset of critical parameters in irregular pores is constructed to be related to no Then, the improved PR-EOS model in the pores of shale organic matter is established, and the critical parameters and phase diagrams of the fluid in the pores of shale are obtained by solving the relationship between the pore sizes. The method for calculating the critical parameters of the fluid in the organic pores of the shale gas reservoir and the calculation method of the phase diagram provided by the invention realizes the calculation of the critical parameters in the pores of the shale organic matter considering the pore shape and adsorption characteristics at the same time, and can analyze and recognize the pore size and pore shape at the same time. Influence law on fluid phase state.

Description

technical field [0001] The invention relates to the technical field of gas reservoir development, in particular to a method for calculating critical parameters and phase diagrams of fluids in organic matter pores of shale gas reservoirs. Background technique [0002] As an unconventional oil and gas resource, shale gas plays an important role in the energy structure and has attracted widespread attention. Shale gas exploration and development has achieved some success, but shale gas exploration and development still faces many challenges. Compared with conventional gas reservoirs, fluids in shale gas reservoirs are more sensitive to relative temperature and pressure. At present, the mechanism of fluid phase transition and microscopic migration in confined spaces is still unclear. Inaccurate model descriptions of phase behavior can lead to biased yield predictions. Therefore, it is of great significance to accurately calculate the dynamic parameters of shale gas reservoir ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/28G01N23/2251G06F113/08G06F119/14
CPCG06F30/20G06F30/28G01N23/2251G06F2113/08G06F2119/14
Inventor 苏玉亮付金刚郝永卯李蕾王文东张雪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)