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Calculation method for wettability of coal/shale in high-pressure environment

A calculation method and high-pressure environment technology, applied in complex mathematical operations, surface/boundary effects, design optimization/simulation, etc., can solve problems such as lack of consideration of wettability change factors

Pending Publication Date: 2022-07-05
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for calculating the wettability of coal / shale in a high-pressure environment, which solves the lack of consideration of gas adsorption and the relationship between water-gas-coal / shale in the process of measuring the wettability of coal / shale in the prior art Interaction between wettability changing factors

Method used

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  • Calculation method for wettability of coal/shale in high-pressure environment
  • Calculation method for wettability of coal/shale in high-pressure environment
  • Calculation method for wettability of coal/shale in high-pressure environment

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Embodiment 1

[0087] For demonstration, the present invention provides a specific application embodiment, and the operation steps are as follows:

[0088] 1. Sample preparation and loading

[0089] Select the middle-rank coal sample in the Ordos Basin, pulverize the coal sample to obtain coal sample particles with a diameter of about 1 cm, put it in a drying oven to dry to a constant weight, and weigh 19.88 g; vacuum the sample with saturated water for 48 hours to ensure that the sample is Fully saturated water. Take the fully saturated water sample, wipe off the excess water on the surface of the fully saturated water sample, and put the fully saturated water sample into the PEEK high pressure resistant sample chamber.

[0090] 2. Select the low-field NMR measurement parameters and set the ambient temperature

[0091] The CPMG (Carr-Purcell-Meiboom-Gill) measurement sequence is selected, and the specific measurement parameters are as follows: echo time (TE)=0.3ms, stacking times (SCANS)=...

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Abstract

The invention provides a method for calculating wettability of coal / shale in a high-pressure environment, which comprises the following steps: step 1, in a high-pressure CO2 environment, adsorbing water and CO2 adsorbing gas are adsorbed on the surface of the coal / shale, and the surface of the coal / shale has wettability characteristics of a mixed surface; step 2, obtaining a wettability expression of the surface of the coal / shale adsorbed with the gas by combining the relational expression of the wettability of the liquid on the mixed surface with the conditions in the step 1; 3, obtaining an expression of the wetting angle of the surface of the coal / shale which is not adsorbed by the gas by combining the wetting angle Young equation with the'sharp-kink 'approximation theorem; and step 4, obtaining an expression of the surface wetting angle of the coal / shale adsorbed with the gas in the high-pressure CO2 environment in combination with the updating. According to the method, the problem that in the coal / shale wettability measurement process in the prior art, the wettability change factor caused by gas adsorption and water-gas-coal / shale interaction is lacked to be considered is solved.

Description

[0001] Field of study [0002] The invention belongs to coalbed methane, shale gas exploration and development and CO 2 The technical field of reservoir wettability measurement and evaluation in the process of geological storage, particularly relates to a calculation method of the wettability of coal / shale in a high pressure environment. Background technique [0003] Wettability refers to the ability of a liquid to spread on a solid surface. The judgment of the wettability of coal / shale in a high-pressure gas environment is important for CBM and shale gas development, and the CO of coal or shale reservoirs. 2 Containment is critical. The wettability of coal / shale in high-pressure gas environment is an important factor affecting the distribution of gas and water in the formation and the two-phase seepage process of gas and water in the process of natural gas development. At the same time, for shale layers, the judgment of wettability is to evaluate it as CO 2 Important indic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N13/02G06F17/11G06F30/25
CPCG01N13/00G01N13/02G06F30/25G06F17/11G06F2119/14G01N2013/0283
Inventor 刘大锰孙晓晓姚艳斌蔡益栋
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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