Research on Effect of Hydraulic Fracturing Process on Natural Fractures Expansion
In order to solve the problem of difficult collapse and collapse of hard roof,numerical simulation software was used to simulate hydraulic fracturing technology.It was found that as the injection volume continued to increase,the crack was affected by the horizontal stress difference.After the crack started to crack,it first expanded along the crack tip,and then gradually deviated and developed towards S-shaped characteristics.Simultaneously cracking can be divided into three stages:pressure rise stage,pressure rapid decrease stage,and pressure stable stage.At the same time,research on the impact of natural cracks on their initiation and expansion has found that natural cracks can play a certain role in crack guidance,but when the horizontal stress difference reaches a certain level,the interference degree of natural cracks weakens.
numerical simulationhard top platecrack orientationnatural cracks
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