压裂混砂搅拌装置关键结构分析与流场模拟  

Structural Analysis and Flow Field Simulation of Fracturing Sand Mixing Device

作　　者：黄天成[1,2] 王德国[1] 周思柱[2] 廖建敏[2] 

机构地区：[1]中国石油大学(北京)机械与储运工程学院 [2]长江大学机械结构强度与振动研究所

出　　处：《石油机械》2015年第11期96-101,共6页China Petroleum Machinery

基　　金：高等学校博士学科点专项科研基金项目"压裂混砂车搅拌装置搅拌漩涡形成机理研究"(20124220110001);湖北省教育厅重点项目"基于大涡模拟的混砂车搅拌装置混合与功率特性研究"(D20151306)

摘　　要：混砂搅拌装置性能对压裂技术的实施起着关键性作用。针对混砂搅拌的特点及对压裂混合液的质量要求,确定了压裂混砂设备关键部件中搅拌叶轮和混砂罐的结构设计方法。利用Fluent软件完成了对搅拌罐内部流场的分析,得到了固相体积分数为0.6的混合液在2 s内的压力与密度分布云图,并针对不同固相体积分数对搅拌效果的影响,对搅拌罐搅拌20 s后的内部密度流场进行了数值模拟。分析结果表明,罐内形成了上、下2个流场循环,在交汇处形成了低压区;数值分析计算处罐中混合密度与理论分析结果比较接近;固相体积分数为0.6的混合液搅拌罐底部密度大部分区域较理论值偏小,固相体积分数为0.4和0.2的混合液搅拌罐底部较大部分区域的密度与理论值偏大。结构分析以及数值模拟验证为混砂搅拌装置的设计提供了理论依据。The sand mixing device performance plays a key role in the fracturing technology implementation. Considering the structural characteristics of agitator and fracturing slurry quality requirements,the structural design methods for agitator impeller and mixed sand tank are identified. The Fluent software has been used to analyze the internal flow field of the agitator tank. The pressure and density distribution of the agitator tank under the solid phase volume fraction of 0. 6 after 2 s mixing are obtained. To study the effect of different solid volume fractions on the mixing performance,the density distributions of the flow field inside the agitator tank after 20 s mixing have been simulated. The results show that two flow fields are formed in the agitator tank,and a low pressure area is presented in the intersection area. Numerical analysis on the mixing density in tank is close to the theoretical analysis results. Simulated density of most of the agitator tank bottom is smaller than the theoretical value under the solid phase volume fraction of 0. 6,but larger than the theoretical value under the solid phase volume fraction of 0. 4 and 0. 2. The structure analysis and the numerical simulation provide a theoretical basis for the sand mixing agitator design.

关 键 词：压裂 混砂搅拌罐 搅拌叶轮 结构分析 数值模拟 

分 类 号：TE934[石油与天然气工程—石油机械设备]