基于LedaFlow和Fluent的冲蚀临界速率研究

Study on erosion velocity limit using LedaFlow and Fluent

关键词:  页岩气  气固冲蚀  临界速率  LedaFlow  数值模拟

Key words:  shale gas  gas-solid erosion  velocity limit  LedaFlow  numerical simulation

摘要:

利用水力压裂技术开采页岩气,生产过程中会携带泥砂等固体杂质。气体携砂在管道中流动时,速度过大会对弯头等关键部件产生冲击,从而造成冲蚀,对管道安全运行造成隐患。基于LedaFlow的API RP 14E冲蚀临界速率预测模型对页岩气管道携砂能力进行模拟计算,分析了管道直径、压力、流量对冲蚀临界速率的影响,并通过Fluent数值模拟计算出冲蚀临界速率对应的管壁最大冲蚀损失量,从而给出冲蚀临界速率和管壁最大年冲蚀损失量的关系式,既弥补了LedaFlow无法计算出管壁冲蚀损失的问题,也简化了Fluent的复杂计算过程,为实际生产提供参考。 

Abstract:

When using hydraulic fracturing to extract shale gas, the solid impurities are generally carried out, such as mud and sand in the production process. While the gas flows carrying sand in the pipeline, the key components such as elbow will be rushed for the too high speed, then resulting in erosion and hidden danger to the safe operation of the pipeline. In this paper, the prop-carrying capacity of shale gas pipeline was simulated on the base of API RP 14E model in LedaFlow, the effect of the pipe diameter, pressure and flow rate on erosional velocity limit was analyzed. then the maximum erosion loss of pipe wall corresponding to the erosional velocity limit was calculated by Fluent numerical simulation. and finally the relationship of them were given. This formula not only solves the problem that LedaFlow can not calculate the erosion loss of pipe wall, but also simplifies the complex calculation process of Fluent software, which provides a reference for practical production.