中国石油大学学报（自然科学版）2024，Vol.48Issue(1)：142-149,8.DOI:10.3969/j.issn.1673-5005.2024.01.015
支撑剂回流对页岩人工裂缝导流能力影响试验
Experiment of proppant backflow effect on shale artificial fracture conductivity
摘要
Abstract
Proppant backflow is one of the key factors causing damage to the conductivity of artificial shale fractures,and a quantitative characterization of proppant backflow under actual stress loading conditions is required.In this study,an in-house developed conductivity test system was used to simulate the proppant backflow during fracturing fluid flowing back by adding a proppant backflow chamber module,and long-term conductivity comparison tests of shale artificial fractures with dif-ferent stress loading methods(variable confining pressure test and variable flow pressure test)were carried out.The results show that different stress loading methods have similar effects on the amount of proppant crushed and embedded,but the change of proppant backflow rate with confining pressure is about 4.46%,which is inconsistent with the field proppant back-flow data.Under the variable flow pressure test,the proppant backflow rate is 20.53%with the flow pressure 20 MPa,and the backflow rate decreases with flow pressure decrease,which is Consistent with the field proppant backflow phenomenon.In addition,ignoring the backflow of proppant will lead to a low damage rate to the fracture conductivity,which is not conducive to the formulation of construction plans.Therefore,an accurate test of the hydraulic conductivity of artificial fractures in shale should adopt the variable pressure test method,which is more consistent with the actual stress loading,in order to better re-flect the influence of proppant backflow on the hydraulic conductivity.关键词
页岩/人工裂缝/导流能力/支撑剂回流/铺砂Key words
shale/artificial fractures/conductivity/proppant reflux/sand paving分类
能源科技引用本文复制引用
陈浩,高帅强,吴天鹏,张鉴,樊怀才,周涛,杨胜来..支撑剂回流对页岩人工裂缝导流能力影响试验[J].中国石油大学学报（自然科学版）,2024,48(1):142-149,8.基金项目
国家科技重大专项(2017ZX05037-001,2016ZX05062-002) （2017ZX05037-001,2016ZX05062-002）
北京市自然科学基金项目(3173044) （3173044）
中国石油天然气股份有限公司科技重大专项(2016E-0611) （2016E-0611）
