Method for measuring liquid flow in saturated porous medium

Abstract

The invention provides a method for measuring a liquid flow in a saturated porous medium. The method belongs to the technical field of experimental mechanics testing, and comprises the steps of continuously downwards flowing fluorescence pore fluid in a porous transparent medium, producing a sector laser light by a laser through the transparent medium, entering a saturated transparent porous medium, and acting with fluorescent particles in the flowed pore fluid to produce a laser speckle effect; shooting laser speckle plane images in the transparent saturated porous medium at different times through a digital camera, carrying out correlation analysis, acquiring movement displacement, a speed value and a vector of the fluorescent particles, and obtaining the flowing speed magnitude and a vector diagram of the pore fluid; finally combining with a calibration parameter of the digital camera to obtain actual displacement and speed value, and obtaining flowing speed magnitude distribution and direction of the fluid in the saturated transparent porous medium. The method provided by the invention is used for researching a speed field change rule of seepage in the saturated porous medium in a natural world, and has significance on researching oil gas flowing and mining.

Description

technical field [0001] The invention belongs to the technical field of experimental mechanics testing, and relates to a method for measuring liquid flow in saturated porous media, in particular to the use of transparent particle media and pore liquid with matching refractive index to form saturated porous media and digital image correlation technology to measure saturated porous media A method of pore fluid flow in a medium. Background technique [0002] Porous media such as rocks, sand, soil, grains, and industrially produced granular products are ubiquitous in nature and industry. The flow of pore liquid in saturated porous media is a problem that researchers pay more attention to. This basic problem is very important for understanding the mechanism of liquid flow in porous media, and it can be applied to the flow, drainage and infiltration of oil and gas in porous media such as rock and soil. And other important engineering problems are very important. The flow of pore ...

AI Technical Summary

Problems solved by technology

The flow of pore liquid in porous media such as rock mass can be measured by nuclear magnetic resonance imaging, but because this technology is relatively expensive, it is difficult to be widely used, and it is also difficult to apply to discrete granular media such as sand and soil.

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