天然气工业2017，Vol.37Issue(7)：52-59,8.DOI:10.3787/j.issn.1000-0976.2017.07.008
射孔孔眼磨蚀对分段压裂裂缝扩展的影响
Influence of perforation erosion on multiple growing hydraulic fractures in multistage fracturing
摘要
Abstract
In multi-stage hydraulic fracturing,the limited-entry method is widely used to promote uniform growth of multiple fractures.However,this method's effectiveness may be lost because the perforations will be eroded gradually during the fracturing period.In order to study the influence of perforation erosion on multiple growing hydraulic fractures,we combined the solid-fluid coupling model of hydraulic fracture growth with an empirical model of perforation erosion to implement numerical simulation.The simulations show clearly that the erosion of perforation will significantly deteriorate the non-uniform growth of multiple fractures.Based on the numerical model,we also studied the influences of proppant concentration and injection rates on perforation erosion in multi-stage hydraulic fracturing.The results indicate that the initial erosion rates become higher with the rising proppant concentration,but the growth of multiple hydraulic fractures is not sensitive to the varied proppant concentration,and that higher injection rates are beneficial significantly to the limited-entry design,leading to more uniform growth of fractures in multi-stage hydraulic fracturing,enough high injection rates are proposed to keep uniform growths.关键词
非常规油气藏/水平井/孔眼摩阻/孔眼磨蚀/分段压裂/数值模拟/数学模型/裂缝均匀发育Key words
Unconventional oil and gas reservoir/Horizontal well/Perforation friction/Perforation erosion/Multi-stage hydraulic fracturing/Numerical simulation/Mathematic model/Uniform growth of fractures引用本文复制引用
李勇明,陈曦宇,赵金洲,许文俊,吴娟,符东宇..射孔孔眼磨蚀对分段压裂裂缝扩展的影响[J].天然气工业,2017,37(7):52-59,8.基金项目
国家自然科学基金重大项目“页岩地层动态随机裂缝控制机理与无水压裂理论”(编号:51490653)、国家重点基础研究发展计划(973计划)项目“中国南方海相页岩气高效开发的基础研究”(编号:2013CB228004). （编号:51490653）
