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Evaluation method of shale methane adsorption capacity considering multiple adsorption mechanisms

A shale and methane technology, applied in the field of unconventional natural gas exploration and development, to achieve reasonable and accurate results

Active Publication Date: 2022-03-15
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

At present, although there are many isothermal adsorption models for methane in shale, none of the models considers the difference in the methane density of the adsorbed phase in pores of different sizes. The methane density of the adsorbed phase in different isothermal adsorption models is considered to be the same.
According to the conclusion of molecular dynamics simulation research, in the micropores, methane molecules are affected by the superposition of the adsorption potential of the pore wall, so that the molecular arrangement of the adsorption phase is closer and the density is higher, which is not found in the existing research on isotherm adsorption models. to distinguish

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  • Evaluation method of shale methane adsorption capacity considering multiple adsorption mechanisms
  • Evaluation method of shale methane adsorption capacity considering multiple adsorption mechanisms
  • Evaluation method of shale methane adsorption capacity considering multiple adsorption mechanisms

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Embodiment 1

[0063] The data used in this example comes from the shale sample 4-08 adsorption data in the disclosure (Tian et al., 2016), which is taken from the Sichuan Basin Reef Dam, and the experiment is used in volume equipment and equipment in 35.4 ° C, 50.4 ° C and 65.4. Conditions under ° C, the concentration adsorption experiment data obtained figure 1 And Table 1.

[0064] In the chemical database of the National Standards and Technology Research Institute, the free phase methane density under different temperatures and pressure conditions is obtained, as shown in Table 1.

[0065] The equivalent temperature adsorption experimental data measured at different temperatures was fitted and calculated at different temperatures and the fitting R. 2 As shown in table 2. The fitted parameter is brought into the DA-TBET model, and the calculation results are compared with the experimental data, such as figure 2 Indicated. As can be seen from Table 2, equipped with different temperatures 2 Ove...

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Abstract

The invention discloses a method for evaluating the ability of shale to absorb methane considering multiple adsorption mechanisms. Based on the differences in the adsorption mechanisms in nanopores of different sizes and the differences in the methane density of the adsorption phase under different adsorption mechanisms, the adsorption and multiple The DA-TBET isothermal adsorption model established by the joint characterization of molecular layer adsorption has a clear physical background, overcomes the shortcomings of the current adsorption model, and evaluates the methane adsorption capacity of shale more reasonably and accurately. In addition, the present invention is not only used for evaluating the ability of shale to absorb methane, but also for evaluating the ability of coal seam samples to absorb methane, and has important application value in the exploration and development of unconventional natural gas.

Description

Technical field [0001] The present invention relates to the field of unconventional natural gas exploration and development, and in particular, to a shale adsorption methane capacity assessment method considering multiple adsorption mechanisms. Background technique [0002] The reasonable and accurate assessment of shale adsorption methane capacity is an important basis for the high efficiency development of shale gas, and has a pivotal position in gas reservoir development. By reasonable and accurate assessment of lesion adsorbentation capabilities, the geological reserves of gas reservoir can be calculated, and the research and adjustment of shale gas reservoir development and adjustment is important, and related research is widely concerned. [0003] Indoor and other temperature adsorption experiments are an important method for studying shale adsorbent capabilities. The researchers have carried out a large number of experimental improvement and innovation and theoretical deri...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20G06F2119/14
Inventor 赵玉龙刘香禺张烈辉张芮菡唐慧莹郭晶晶
Owner SOUTHWEST PETROLEUM UNIV
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