Preparation device and preparation method of mixed wettability sandstone microscopic model

Abstract

The invention discloses a preparation device and a preparation method of a mixed wettability sandstone micromodel.The preparation device comprises a fixing frame and a light source located above the fixing frame, and the fixing frame comprises a frame body, a plurality of light shielding plates sequentially arranged on the frame body at intervals from top to bottom and a clamping and fixing plate located below the light shielding plates; the clamping and fixing plate is used for fixing a sandstone microscopic model, a plurality of light-transmitting channels are prefabricated in the light-shading plates respectively, light-shading areas which are sequentially increased or decreased from top to bottom are arranged in the light-transmitting channels, and the positions of the light-shading areas of every two adjacent light-shading plates correspond to each other; light emitted by the light source can sequentially pass through the multiple light-transmitting channels and then irradiate the sandstone micro-model. According to the application, the light source is arranged above the fixing frame, so that light emitted by the light source can irradiate the plurality of light shielding plates, and irradiates the microscopic model positioned on the bottom light shielding plate through the light transmission channels on the light shielding plates, so that the microscopic model has the characteristics of mixing and wetting.

Description

technical field [0001] The invention relates to the field of microscopic model preparation, in particular to a preparation device and preparation method of a mixed wettable sandstone microscopic model. Background technique [0002] Sandstone is a kind of source rock which is composed of sedimentary clastic rock with more than 50% of quartz and feldspar, and accumulated in the basin through weathering, denudation and transportation. Among them, there are pore structures developed to different degrees in the sandstone reservoir. When the sandstone reservoir is under the influence of engineering disturbances such as mining or fracturing, the fluid with high osmotic pressure and high hydraulic gradient will be in the pores under the action of pressure difference. The gas-water two-phase unsaturated flow occurs in the structure, and the wettability of the sandstone reservoir is an important factor determining the gas-water two-phase unsaturated flow. [0003] Specifically, the r...

AI Technical Summary

Problems solved by technology

However, the complex mixed-wet characteristics in sandstone reservoirs have not been accurately characterized

In other words, changing the wettability of the microscopic model as a whole will make the wettability everywhere in the microscopic model equal, and the microscopic model cannot simulate the mixed-wet characteristics of real sandstone reservoirs

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