摘要
首先介绍了两种测试对裂缝闭合压力的解释方法及测试流程,并进行了流固耦合有限元模拟研究。西部某交通隧道地质条件复杂,岩层致密、渗透性低,研究回流辅助测试方法来提高小型压裂测试效率和精度尤为必要。在每个测试段同时使用自然压降和回流压降两种方法来分析裂缝闭合。研究结果表明,每个回流周期都会产生一个独特且可重复的裂缝闭合现象,使得裂缝闭合压力的解释更为容易;两种测试方法所解释的裂缝闭合压力的结果是一致的,检验了回流辅助小型压裂地应力测试方法的合理性,为类似工程提供参考借鉴。
Firstly,two kinds of interpretation method and testing processes for crack closure pressure are introduced,and fluid-structure coupling finite element simulation is carried out.A traffic tunnel in western China has complex geological conditions,large burial depth,dense rock strata and low permeability,so it is particularly necessary to study the backflow auxiliary test method to improve the efficiency and accuracy of small fracturing test.Fracture closure was analyzed using both natural and return pressure drop method in each test section.The result show that each flowback period produces a unique and repeatable fracture closure phenomenon,which makes the interpretation of fracture closure pressure easier.The result of fracture closure pressure interpreted by the two testing method are consistent,which verifies the rationality of the in-situ stress testing method assisted by flowback in small fracturing,and can provide reference for similar projects.
作者
陈建钢
刘汝明
许乃岑
徐斌
陈子扬
CHEN Jiangang;LIU Ruming;XU Naicen;XU Bin;CHEN Ziyang(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,Sichuan,China;Broadvision Engineering Consultants Co.Ltd.,Kunming 650011,Yunnan,China;Nanjing Center of Geological Survey,Nanjing 210016,Jiangsu,China;University of Calgary,CalgaryT4B 2Z8,Canada;Origin Geomechanics Inc.,Calgary T4B 2Z8,Canada;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第S02期248-253,共6页
Water Resources and Hydropower Engineering
基金
云南省交通运输厅科技创新及示范项目(云交科2017(A)12)
贵州省科技厅重大专项(黔科合重大专项字[2018]3011)
国家自然科学基金项目(41902275)
四川乐汉高速公路有限责任公司科技项目(SRIG2019GG0004)
中电建冀交高速公路投资发展有限公司科技项目(TH-201908)
自然资源部中国地质调查局地质调查项目(DD20221662)。
关键词
小型压裂测试
回流辅助
裂缝闭合压力
瞬态压力分析
mini-frac test
flowback assisted
fracture closure pressure
transient pressure analysis
