Simulation study on efficiency of jet pumps with different power media in Sulige Gas Field
苏里格气田不同动力介质射流泵效率模拟研究

摘要

针对苏里格气田高含水区平面上气水分布复杂多变，气井生产周期内产气、产水量变化较大、排液困难问题，现场进行了射流泵排水采气工艺先导性试验，取得了一定效果，但在射流排采先行试验中，气动与液动射流泵泵效高低不明确为排采制度及模式的确立带来不便。为明确气动与液动射流泵效高低，本文采用CFD数值模拟技术，利用多面体网格划分技术，模拟了天然气和地层水作为动力流体的射流泵在不同流量比下的效率。结果表明，在流量比小于1.0时，液动射流泵的最大泵效为16.7%，而气动射流泵在流量比小于0.5时的最大泵效为9.8%，单考虑射流泵内部能量转换时，液动射流泵在效率和工作区间上均优于气动射流泵。

Abstract

In response to the complex and variable gas-water distribution in the high water-cut area of the Sulige Gas Field, the large variations in gas and water production during the well production cycle, and the difficulty in liquid drainage, a pilot test of jet pump drainage and gas production technology was conducted in the field, achieving certain results. However, the unclear pump efficiency between pneumatic and hydraulic jet pumps in the pilot test hindered the establishment of drainage systems and models. To clarify the efficiency of pneumatic and hydraulic jet pumps, this paper uses CFD numerical simulation technology and polyhedral mesh generation technology to simulate the efficiency of jet pumps using natural gas and formation water as power fluids at different flow ratios. The results show that when the flow ratio is less than 1.0, the maximum pump efficiency of the hydraulic jet pump is 16.7%, while that of the pneumatic jet pump is 9.8% when the flow ratio is less than 0.5. Considering only the internal energy conversion of the jet pump, the hydraulic jet pump is superior to the pneumatic jet pump in both efficiency and operating range.