Selection and Optimization of Throttling Process for Ultra-high Pressure Gas Wells

doi:10.11885/j.issn.1674-5086.2020.10.28.04

Abstract

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

CLC Number:

TE372

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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