中国石油大学学报（自然科学版）2024，Vol.48Issue(3)：101-110,10.DOI:10.3969/j.issn.1673-5005.2024.03.011
径向井辅助前置液酸压裂缝扩展数值模拟
Numerical simulation of fracture propagation guided by radial well assisted preflush acid fracturing
摘要
Abstract
In this paper,a fracture propagation model of radial well assisted preflush acid fracturing was established based on the extended finite element method and the two-scale continuum model theory.The term"deflection factor"was introduced as the quantification criterion to analyze the influence of various factors on the fracture morphology,and the main control fac-tors were identified by using the gray correlation analysis method.The simulation results show that the radial well has a sig-nificant guiding effect on the fracture propagation of the preflush acid fracturing.The fracture starts and expands for a certain distance along the radial well,and then gradually deflects to the direction of the maximum horizontal principal stress.Smaller azimuth of the radial well,horizontal in-situ stress difference and elastic modulus of rock and longer length of the radial well can cause smaller deflection factor and better guiding effect.The most important influence factor is the horizontal in-situ stress difference.For instance,when the azimuth of the radial well is 15°,the fracture can propagate 14.32 m along the ra-dial well,and deflect to the direction of the maximum principal stress finally.In this case,the radial well has the best guid-ing effect,and the deflection factor is 0.005.关键词
径向井/前置液酸压/裂缝扩展/扩展有限元/双尺度模型Key words
radial well/preflush acid fracturing/fracture propagation/extended finite element method/two-scale continuum model分类
能源科技引用本文复制引用
齐宁,甘俊冲,章泽辉,刘毅龙,申玉洋,刘练..径向井辅助前置液酸压裂缝扩展数值模拟[J].中国石油大学学报（自然科学版）,2024,48(3):101-110,10.基金项目
国家自然科学基金项目(51874336) （51874336）
