压裂工况下T形三通冲蚀影响数值模拟

Numerical Simulation of Erosion Effect of T-type Tee under Fracturing Condition

基于Fluent内置的离散相模型(DPM)探究流速、质量流量、粒子直径、进出口流通方式对T形三通冲蚀的影响。结果表明:内部流速与冲蚀率的变化关系呈现幂函数关系,且曲线中存在冲蚀影响临界流速。液体流速小于临界流速,流速的增加引起冲蚀程度增加较不明显,当流速超过临界流速,引起冲蚀率的急剧增加。支撑剂颗粒粒径与冲蚀率的变化正相关。汇流状态下的冲蚀率最大,分流状态下的冲蚀率最小。汇流状态下的冲蚀率最大是分流状态下的30.7倍;既不分流也不汇流状态下的最大冲蚀率可以达到了分流状态的冲蚀率的5.4倍。

The erosion behavior of T-type tee under fracturing condition was studied in discrete phase model built in Fluent under the factors of flow velocity,mass flow rate,particle diameter,and inlet and outlet circulation modes.Relationship between internal velocity and erosion rate showed a power function and the erosion affected the critical velocity as shown in the relationship curve.Within the critical point,the increase of the flow rate with the increase of erosion degree was not obvious,while beyond the critical point,the erosion rate increased sharply.Correlation between the particle size of proppant particles and the erosion rate was positive.The erosion rate reached the maximum in confluent state and minimum in diversion state,which was 30.7 times apart.The maximum erosion rate under no diversion nor confluence was 5.4 times of that in diversion state.