Method for manufacturing real coal two-dimensional microfluid model

Abstract

The invention provides a method for manufacturing a real coal two-dimensional microfluid model. The method comprises the following steps of: 1, scanning a columnar coal sample by using a CT (Computed Tomography) instrument to obtain a real fracture network; 2, a wire cutting machine is adopted, and blocky coal rock of 7.2 * 7.2 * 1.5 cm is cut on the large coal sample; 3, placing the real coal rock block on a silica gel grinding tool with the inner wall size of 8 cm * 8 cm * 2 cm, and pouring the epoxy resin glue until the epoxy resin glue is solidified; step 4, inputting the real fracture network or the simplified fracture into a laser marking machine, and etching the fracture on the surface of the blocky coal sample; and step 5, manufacturing a PET film of 7.2 * 7.2 cm, adding a silica gel coating with a nanometer thickness on one surface of the PET film through a coating process, and then bonding the PET film with the coal rock through the silica gel coating, so that the accuracy and controllability of the experiment are ensured, and the PET film and the nanometer silica gel coating have excellent light transmittance, so that the research on the basic theory of coal bed gas migration is facilitated. The method has important significance in improving the coal bed gas recovery ratio.

Description

technical field [0001] The invention designs the field of coal bed gas development, and in particular relates to a method for making a real coal two-dimensional microfluidic model. Background technique [0002] At present, with the continuous development of my country's coalbed methane industry, the continuous deepening of coalbed methane-related development theories, the mechanism of gas-water two-phase migration and the improvement of low-production well productivity have increasingly become research hotspots and difficulties; The research and development of the problem is mainly divided into two categories: real sandstone microscopic model and glass simulation model. [0003] As a pore-fracture dual medium, coal has strong heterogeneity, and the coal-rock fracture network is mainly used as a channel for gas-water migration in the process of coalbed methane development. The gas-liquid or liquid-liquid flow in the tunnel is different from the gas-liquid flow in the cracks t...

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Problems solved by technology

[0003] As a pore-fracture dual medium, coal has strong heterogeneity, and the coal-rock fracture network is mainly used as a channel for gas-water migration in the process of coalbed methane development. The gas-liquid or liquid-liquid flow in the tunnel is different from the gas-liquid flow in the cracks to be studied in the field of coalbed methane, and the material used in the existing coal model is glass material, and the glass material is obtained through the existing wet engraving method. Etching and dry etching cannot reach the nanoscale level or the microscopic model made of real sandstone slices as raw materials. During the production process, adhesives need to be added to change the surface properties of the core, and the observation effect is poor, and the fluid inside the observation channel cannot be reached. The purpose of flow, adsorption, and diffusion, on the other hand, when making microscopic models, sandstone with well-developed pores is often selected, which has certain limitations. Microscopic models used in the petroleum industry in the past are not suitable for gas in pore-scale coal reservoirs. Therefore, it is necessary to design a method for making a real coal two-dimensional microfluidic model to solve the above problems

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