Visual test method and system for simulating rough single-cross fracture multiphase seepage

Abstract

The invention provides a visual test method and system for simulating rough single-cross fracture multiphase seepage, wherein the test method comprises the following steps: S10, collecting a rock masssample on site, carrying out the statistics of the roughness of a fracture surface, and determining fractal characteristic parameters; S20, outputting a three-dimensional rough fracture model grid file; S30, preparing transparent or opaque three-dimensional rough fracture model samples with different roughness; S40, assembling a test device according to a single-fracture or cross-fracture test object; S50, simulating a fluid displacement process under the action of pressure difference, and carrying out a rough fracture medium multiphase displacement test; S60, collecting test data; and S70, arranging and analyzing the multiphase seepage characteristics of the rough fractured medium. The displacement mechanism of multiphase fluid in the fractures with different roughness and opening degrees can be systematically studied, and certain guiding significance is achieved for study of the water seal mechanism of a rough fractured rock mass of an underground water seal oil depot.

Description

technical field [0001] The invention relates to the technical field of underground water-sealed caverns, in particular to a visual test method and system for simulating multiphase seepage in rough single-intersecting fissures. Background technique [0002] The underground water-sealed oil depot is one of the best ways to store oil. During its construction and operation, the reliability of the water seal is the object that needs to be paid attention to. Most of the underground water-sealed oil depots are built in the granite body, and the seepage of the granite body mainly occurs in the cracks of the rock mass. Therefore, the water seal of underground water-sealed oil storage can be generalized as a dynamic process of mutual displacement of water, oil and gas in fractured media. [0003] The surface of natural granite cracks has a certain roughness. The fBm method is a mathematical model proposed by Mandelbrot and Ness, which can be used to describe irregular surfaces such a...

AI Technical Summary

Problems solved by technology

Chinese Invention Patent Application CN201610574998.5 A Quantitative Visual Simulation System and Test Method for Seepage in Rough Fracture Networks, and CN201910655846.1 Device and Method for Visualizing Fissure Seepage Using Magnetic Fluid Simulation Both involve visual simulation of fissure seepage, but their The research is not on the displacement of medium fluid in fractures, let alone the displacement of multiphase fluids, nor the acquisition of rough fractures and their influence on the displacement process of multiphase fluids. There are few studies on the influence of phase fluid displacement process, and there are no related test devices and test methods.

Images