大庆石油地质与开发2026，Vol.45Issue(2)：59-67,9.DOI:10.19597/J.ISSN.1000-3754.202412046
深部煤层气转向压裂缝内暂堵剂运移封堵数值模拟
Numerical simulation of migration and plugging of temporary plugging agents in redirected fractures of deep coalbed methane
摘要
Abstract
During the development of coalbed methane(CBM),due to the high plasticity of deep coal rock and large in-situ stress difference,temporary plugging and diversion fracturing technique is mainly used to promote com-plex fracture network propagation.However,field fracturing data shows that temporary plugging parameters in some fracturing stages are unreasonable,failing to achieve successful bridging and plugging of the agents within the frac-tures,resulting in diversion failure and consequently impacting the fracturing effect.Considering the influence of proppant sand bank on the migration of temporary plugging agents within fractures,a numerical model for tempo-rary-plugging-agent particle migration and plugging in coal-rock hydraulic fractures is established based on the cou-pling of Computational Fluid Dynamics(CFD)and Discrete Element Method(DEM),exploring the bridging be-havior of temporary plugging agent particles and plugging efficiency under different operational parameters.The re-sults indicate that,when temporary plugging agent is injected,the optimal volume ratio of large-to-small particle size is 4:1.Key factors such as fracturing fluid viscosity,temporary plugging agent volume fraction and fluid injec-tion rate affect the bridging time,plugging volume and bridging distance.The inlet fracture width shows no signifi-cant correlation with the volume of temporary plugging agent,achieving effective temporary plugging at various frac-ture widths.The research provides theoretical guidance for the field temporary plugging and diversion technique in deep coalbed methane and the regulation mechanism of artificial fracture networks.关键词
暂堵剂/运移封堵/深部煤层气/流体动力学与离散元方法耦合(CFD-DEM)Key words
temporary plugging agent/migration and plugging/deep coalbed methane/computational fluid dynamics-discrete element method coupling(CFD-DEM)分类
能源科技引用本文复制引用
任岚,赵格,林然,任千秋,吴建发,宋毅,沈骋..深部煤层气转向压裂缝内暂堵剂运移封堵数值模拟[J].大庆石油地质与开发,2026,45(2):59-67,9.基金项目
国家自然科学基金项目"深层超深层页岩气水平井压裂缝网高效建造理论与方法研究"(U21B2071) （U21B2071）
国家自然科学基金项目"纳米-超临界CO2压裂-置换-驱替协同提高页岩气采收率基础研究"(U24A2084). （U24A2084）
