锥芯可调型引射技术变工况适应性实验研究

doi:10.11949/j.issn.0438-1157.20181522

摘要/Abstract

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

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

中图分类号:

TE 377

刘培启, 何昕琛, 陈佳, 郭江涛, 席建宇, 胡大鹏. 锥芯可调型引射技术变工况适应性实验研究[J]. 化工学报, 2019, 70(6): 2252-2258.

Peiqi LIU, Xinchen HE, Jia CHEN, Jiangtao GUO, Jianyu XI, Dapeng HU. Variable working condition adaptability of cone core adjustable ejector[J]. CIESC Journal, 2019, 70(6): 2252-2258.

图/表 14

图1 调节锥式可调式引射器

Fig.1 Adjustable cone adjustable ejector schematic

图2 调距式引射器

Fig.2 Schematic diagram of needle throttle type ejector

图3 锥芯式引射装置

Fig.3 Relative position of cone core and nozzle

图4 实验流程

Fig.4 Schematic diagram of experimental process

图5 引射器关键结构实物图

Fig.5 Photos of main structure of ejector

图6 可调锥位置与高压入口流量关系

Fig.6 Relation of position of adjustable cone and high pressure inlet flow

图7 可调锥位置与低压入口流量的关系

Fig.7 Relation between position of adjustable cone and low pressure inlet flow

图8 可调锥位置与引射率的关系

Fig.8 Relation of adjustable cone position and ejector rate

图9 P m =0.13 MPa、Pl = 0.1 MPa时，具有可调锥结构的引射器性能曲线

Fig.9 Ejector performance curves with adjustable cone structure when P m =0.13 MPa and Pl = 0.1 MPa

图10 P m =0.165 MPa、Pl = 0.1 MPa 时，具有可调锥结构的引射器性能曲线

Fig.10 Ejector performance curves with adjustable cone structure when P m =0.165 MPa and Pl = 0.1 MPa

图11 引射率随压缩比的变化曲线

Fig.11 Curves of ejection rate with compression ratio

图12 膨胀比为8.0时，不同调节锥位置下引射率随压缩比的变化曲线

Fig.12 Curves of ejector rate with compression ratio at different adjustment cone positions when expansion ratio is 8.0

图13 膨胀比为6.5时，不同调节锥位置下引射率随压缩比的变化曲线

Fig.13 Curves of ejector rate with compression ratio at different adjustment cone positions when expansion ratio is 6.5

图14 膨胀比为5.0时，不同调节锥位置下引射率随压缩比的变化曲线

Fig.14 Curves of ejector rate with compression ratio at different adjustment cone positions when expansion ratio is 5.0

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