水力压裂过程对天然裂缝起裂扩展的影响研究
Research on Effect of Hydraulic Fracturing Process on Natural Fractures Expansion
徐定峰1
作者信息
- 1. 山西焦煤霍州煤电店坪煤矿,山西 方山 033100
- 折叠
摘要
为了解决坚硬顶板难垮难落的问题,利用数值模拟软件对水力压裂技术进行模拟研究发现,随着注液量的不断增大,受到水平应力差的影响,裂缝起裂后先沿着裂缝尖端进行扩展,然后逐渐发生偏转并逐步向着S型特征发展.同时起裂可分为压力上升阶段、压力快速下降阶段和压力平稳阶段3个阶段.同时对天然裂缝起裂扩展的影响进行研究发现,天然裂缝能够起到一定的裂缝导向作用,而当水平应力差达到一定程度后,天然裂缝的干扰程度减弱.
Abstract
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.
关键词
数值模拟/坚硬顶板/裂缝导向/天然裂缝Key words
numerical simulation/hard top plate/crack orientation/natural cracks引用本文复制引用
出版年
2024
NETL
NSTL
万方数据