超高压气井井口节流工艺选择与优化

doi:10.11885/j.issn.1674-5086.2020.10.28.04

摘要/Abstract

摘要： 超高压气井的节流系统对气井的生命周期起到至关重要的作用，而合理的节流工艺，不但可以延长气井开采寿命，还可降低成本。对国内超高压气井使用的节流工艺进行了介绍，并基于计算流体力学对川西北气矿产气井不同节流工艺内流场进行仿真，运用流场分析软件对单级节流和两级节流工艺系统内部的压力、流速等问题进行了分析，确定了不同节流工艺系统合理CV值及开度，得到了不同节流工艺系统的最高流速，提出了现场不同节流工艺下的节流参数选择及使用建议。研究表明，3种节流工艺均可满足节流要求和现场生产情况，其中，单级节流工艺简单，但流速均在850 m/s以上，阀门冲蚀严重；一级固定二级可调节流的最大流速在550~600 m/s，低于单级节流，但最大产量受限；两级可调节流的最大流速与一级固定二级可调节流相仿，可实现按需调产，但成本相对较高。

关键词: 节流工艺, 节流阀, 笼套CV值, 流速, 节流系统

Abstract: The throttling system of ultra-high pressure gas wells plays a vital role in the life cycle of gas wells, and a reasonable throttling process can not only extend the life of gas wells, but also reduce costs. This research introduces the throttling technology used in domestic ultra-high pressure gas wells, and simulates the flow field of different throttling technology in gas wells in Northwest Sichuan Gas Mine based on computational fluid dynamics. The flow field analysis software is used to analyze the internal pressure and flow rate of single-stage and two-stage throttling process systems. The flow field analysis software is used to analyze the internal pressure and flow velocity of single-stage and two-stage throttling process systems. The reasonable CV value and opening degree of different throttling process systems were determined, and the highest flow rate of different throttling process systems was obtained. The throttling parameters selection and use suggestions under different throttling techniques on site are proposed. The research shows that the three throttling processes can meet throttling requirements and on-site production conditions. Among them, the single-stage throttling process is simple, but the flow rate is above 850 m/s, and the valve erosion is serious; one-stage fixed and two-stage adjustable throttling the maximum flow rate is between 550 m/s and 600 m/s, which is lower than the single-stage throttling, but the maximum output is limited; the maximum flow rate of the two-stage adjustable flow is similar to that of the first-stage fixed two-stage adjustable flow, and can be adjusted as needed. Production, but the cost is relatively high.

Key words: throttling process, throttle valve, CV value of cage sleeve, velocity, throttling system

中图分类号:

TE372

刘鹏, 王崇阳. 超高压气井井口节流工艺选择与优化[J]. 西南石油大学学报(自然科学版), 2023, 45(1): 145-154.

LIU Peng, WANG Chongyang. Selection and Optimization of Throttling Process for Ultra-high Pressure Gas Wells[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 145-154.

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