测井技术2026，Vol.50Issue(3)：545-553,9.DOI:10.16489/j.issn.1004-1338.2026.03.016
基于数值模拟的分层注气气嘴节流压降敏感性分析
Sensitivity Analysis of Throttling Pressure Drop for Layered Gas Injection Nozzles Based on Numerical Simulation
摘要
Abstract
To address the problems of insufficient sensitivity analysis on the throttling pressure drop of gas nozzles,great difficulties in downhole gas nozzle selection and layered flow rate allocation in layered gas injection wells with CO2-bearing natural gas,and to meet the engineering demands of complex deep-sea well conditions,this paper takes the layered gas injection gas nozzles for CO2-bearing natural gas as the research object.Based on the Fluent numerical simulation platform,a numerical calculation system including the energy equation,mass equation,momentum equation,multi-component transport model and standard k-ε turbulence model is established.Using the control variable method,this paper investigates the effects of CO2 molar ratio,gas nozzle diameter,flow rate,temperature,outlet pressure and multi-factor coupling on the throttling pressure drop of gas nozzles,reveals the pressure distribution law inside the gas nozzle,and conducts field tests on an oil production platform in the South China Sea.The results show that:①The throttling pressure drop of the gas nozzle is mainly concentrated in the contraction zone of the nozzle.When the CO2 molar ratio is 20%～80%,the throttling pressure drop decreases in a quadratic function with the increase of CO2 content,and the pressure drop changes more significantly when the CO2 molar ratio is 20%～50%.②Under the action of a single factor,the throttling pressure drop increases in a quadratic function with the increase of flow rate,increases linearly with the rise of temperature,and decreases gradually with the increase of gas nozzle diameter and outlet pressure.③Under the flow rate-temperature coupling effect,the flow rate dominates the increase of pressure drop,and the decrease of temperature can slightly offset the increase of pressure drop.Under the outlet pressure-temperature coupling effect,the two factors synergistically enhance the inhibition effect on pressure drop.④In the field test,a gas nozzle with a diameter of 5.2 mm is adopted,the actual wellhead gas injection pressure is 0.6 MPa higher than the target pressure,and the error between the actual injection flow rate(7.2×104 m3/d)and the target injection flow rate(6.1×104 m3/d)is less than 20%,which meets the requirements of field layered gas injection allocation.The research on the variation law of the throttling pressure drop of CO2-bearing natural gas nozzles under multi-factor and coupling effects can provide reliable theoretical and technical support for the accurate selection of downhole nozzles and the dynamic regulation of layered gas injection flow rate in layered gas injection wells with high CO2 content.关键词
分层注气/含CO2天然气/湍流模型/气嘴/节流压降/敏感性分析/注气调配/注气流量Key words
layered gas injection/CO2-bearing natural gas/turbulence model/gas nozzle/throttling pressure drop/sensitivity analysis/gas injection allocation/gas injection flow rate分类
天文与地球科学引用本文复制引用
任伟,刘肖健,刘兴斌,何威..基于数值模拟的分层注气气嘴节流压降敏感性分析[J].测井技术,2026,50(3):545-553,9.基金项目
国家自然科学基金项目"网络模型的智能分层注水井压力脉冲数据传输方法"(52174021) （52174021）
