Abstract:

With the development of natural gas wells, the wellhead pressure is gradually reduced, and the pressurized gathering and gathering of low-pressure wellheads has become a research hotspot. At present, the common natural gas injection technology has a poor adaptability to gas well pressure and flow due to its fixed structural size, which makes its operating efficiency generally low. Based on this, the cone core adjustable ejector device was designed and processed, and its performance under variable working conditions was studied experimentally. The results show that with the inward movement of the adjustable cone, the flow rate of the high pressure port is reduced, and a wide range of flow adjustment of about 70% can be achieved; Moreover, the flow rate of the low-pressure port is almost unchanged during the adjustment process, so that the ejector rate of the device is improved, and the cone-core adjustable ejector technology has strong resistance to flow fluctuation. With the deepening of adjustable cone, the optimal expansion ratio of the device increases. Thus, the adaptability of the device to the condition of large expansion ratio is improved. At the same compression ratio, the efficiency of the device's ejection increases with the depth of the adjustable cone, but it reduces the range of compression ratios that the device effectively emits.

Key words: natural gas, experimental validation, optimal design, ejection technique, adjustability

摘要：

随着天然气井开发时间的推移，井口压力逐渐降低，低压井口的增压集输成为研究热点。目前，常用的天然气引射技术由于结构尺寸固定，对气井的压力和流量的变化适应性差，使其运行效率普遍较低。据此，设计加工了一台锥芯可调型引射器装置，并对其变工况性能进行了实验研究。结果表明随着可调锥的深入，高压口流量减小，可实现70%左右的流量调节，而且调节过程中低压口流量几乎保持不变，从而使得装置引射率ξ提高，可见该引射技术具有很强的抗流量波动能力。随着可调锥的深入，装置对应的最佳膨胀比增大，从而提高了装置对大膨胀比工况的适应性。同样压缩比下，装置引射效率会随着可调锥的深入而提高，但会降低装置有效引射的压缩比范围。

关键词: 天然气, 实验验证, 优化设计, 引射技术, 可调性