Method for constructing shale adsorption gas adsorption phase density model and calculating absolute adsorption capacity

A construction method and adsorption phase technology, applied in the field of exploration, can solve the problem of not comprehensively considering the impact, etc., and achieve the effect of high accuracy and improved accuracy

Active Publication Date: 2019-11-22
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Many researchers have proposed empirical values ​​or empirical calculation formulas for various gas adsorption phase densities. These research results mainly assume that the gas adsorption phase density is a constant value or a constant value at a certain temperature, and the effects of pressure and temperature on the adsorption phase density are not considered comprehensively. influences

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  • Method for constructing shale adsorption gas adsorption phase density model and calculating absolute adsorption capacity
  • Method for constructing shale adsorption gas adsorption phase density model and calculating absolute adsorption capacity
  • Method for constructing shale adsorption gas adsorption phase density model and calculating absolute adsorption capacity

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Embodiment 1

[0029] like figure 1 A method for constructing a shale adsorbed gas adsorption phase density model is characterized in that it comprises the following steps:

[0030] S10. Obtain the gas phase density ρ of the adsorbate at different pressure points at the temperature T1 g , and the gas phase density ρ g Regression into a polynomial function related to pressure p;

[0031] S20. Construct the organic pores and inorganic pores of shale into oxygen-containing functionalized graphite slit pore structure and illite slit pore structure respectively, construct the slit pore structure model of the adsorbent and construct a variety of slit pores , obtain the excess adsorption capacity and adsorption phase volume of adsorbate in shale under different temperatures, different pressures, and different pore sizes by means of molecular simulation, and calculate the absolute adsorption capacity;

[0032] S30. Constructing an excess adsorption capacity model under the comprehensive influence...

Embodiment 2

[0037] Based on the principles of the above embodiments, the adsorbate in this embodiment takes methane as an example, and discloses a specific implementation method.

[0038] S10. Obtain the gas phase density of methane under different pressures at a certain temperature in the NIST database, and regress the gas phase density into a polynomial function related to pressure, and its expression is:

[0039] ρ g =a 0 +a 1 p+a 2 p 2 +a 3 p 3 .

[0040] The coefficients of the fitted polynomials are shown in Table 1.

[0041] Table 1 Values ​​of coefficients of methane density regression formula

[0042]

[0043]

[0044] S20. Construct the organic pores and inorganic pores of shale into oxygen-containing functionalized graphite slit pore structure and illite slit pore structure respectively, and use Material studio6.0 software to construct the slit pore structure model of the adsorbent respectively and construct There are many kinds of slit holes, including 1nm, 1.5n...

Embodiment 3

[0074] Based on the above embodiments, this embodiment discloses a method for calculating the absolute adsorption capacity of shale adsorbed gas, which includes the following steps:

[0075] SS1: Calculate the adsorption phase density ρ according to the adsorption phase density calculation model constructed by any method of claims 1 to 5 a ;

[0076] SS2: Obtain the gas phase density ρ of the adsorbate gas at temperature T and pressure P g ;

[0077] SS3: Calculate the excess adsorption amount n of the adsorbate gas at temperature T and pressure P ex ;

[0078] SS4: Calculate the absolute adsorption amount, which is:

[0079] no ad =n ex / (1-ρ g / ρ a ).

[0080] Based on the example of embodiment 2 methane, the excess adsorption amount of methane obtained in the shale sample is converted into an absolute adsorption amount, and the results are as follows Figure 5 shown. It can be seen from the figure that the difference between the excess adsorption amount and the a...

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Abstract

The invention discloses a method for constructing a shale adsorption gas adsorption phase density model and calculating absolute adsorption capacity. The method comprises the following steps: regressing gas phase density into a polynomial function related to pressure; constructing a slit pore structure model of the adsorbent, and obtaining excess adsorption capacity, adsorption phase volume and absolute adsorption capacity of adsorbate in shale at different temperatures, different pressures and different pore diameters through a molecular simulation means; constructing an excess adsorption capacity model; obtaining the contribution rate of the adsorbing capacity of the adsorbate in the graphite pores to the adsorbing capacity of the shale sample under different pressure points; obtaining an adsorption phase density model of the adsorbate in the graphite slit holes and an adsorption phase density model of the adsorbate in the illite holes under different temperatures, different pressures and different hole diameters; and constructing a calculation model of the adsorbate adsorption phase density in the shale. The model is based on contribution rate, pressure, temperature and aperturedata, and the adsorption phase density calculated by the model is high in accuracy, so that the calculation accuracy of the absolute adsorption capacity is improved.

Description

technical field [0001] The invention relates to the technical field of exploration, and more specifically relates to a method for constructing a shale adsorbed gas adsorption phase density model and calculating an absolute adsorption amount. Background technique [0002] In 2015, the U.S. Energy Information Administration (EIA) released a report on the evaluation results of shale gas resources in 46 countries including the United States, pointing out that the technically recoverable resources of shale gas in the world are 214.49×1012m 3 , showing the huge development potential of global shale gas resources. The natural gas components in shale gas reservoirs are mainly methane, and shale adsorbed gas is generally mainly methane gas. The temperature of the shale shale reservoir exceeds the critical temperature of methane by 191K, that is, the methane isothermal adsorption experiment of shale is carried out indoors, and the experimental temperature also exceeds the critical te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 熊健黄林林刘向君梁利喜李玮魏晓琛
Owner SOUTHWEST PETROLEUM UNIV
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