Method for researching fractal particle size of multistage fracturing propping agent and fracture characteristic parameter of rock mass

Abstract

The invention relates to the method for researching the fractal particle size of a multistage fracturing propping agent and the fracture characteristic parameter of a rock mass, which comprises the following steps of: (1) selecting a particle screen, and forming propping agent particles with fractal characteristic; (2) preparing the sorted first order of propping agent particles into a fracturing liquid; (3) injecting the prepared fracturing liquid into a test piece, and calculating the fractured wall opening degree of the test piece; (4) preparing the second order of propping agent particles sorted in the step (1) into a fracturing liquid, and calculating the rock mass fracture opening degree after secondary fracturing; (5) preparing the third order of propping agent particles sorted in the step (1) into a fracturing liquid, and calculating the rock mass fracture opening degree after multistage fracturing; and (6) taking down the test piece, and calculating the fractal dimensionality of the fractured wall of the test piece. In the invention, the field multistage fracturing process is simulated, and the relationship between different propping agent particle sizes and the roughness of the fractured wall of fractured rock and the relationship between particle size and fracture opening degree can be determined.

Description

1. Technical field: [0001] The invention relates to a fractal design method for multi-stage hydraulic fracturing sand distribution in oil and natural gas, mining, rock and soil engineering, and specifically relates to a method for studying the fractal particle size of multi-stage fracturing proppant and rock mass fracture characteristic parameters. 2. Background technology: [0002] In the field of oil and natural gas, coal rock mass and other reservoir mining technologies, it is necessary to fracturing the reservoir rocks. The liquid is pumped into the well to generate high pressure at the bottom of the well, and the high pressure drives the water flow to squeeze into the rock mass, overcome the tensile strength of the rock mass, cause the rock mass to rupture, and form a fracture channel with a certain conductivity. Effectively communicate reservoirs to increase oil and gas production speed. At present, the description of the roughness of the fracture wall of hydraulicall...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for studying the fractal particle size of multi-stage fracturing proppant and rock mass fracture characteristic parameters, which is used to solve the existing problem that the relationship between fracturing fluid and rock mass fracture wall cannot be measured and described

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