摘要
致密气储层极易被污染,储层伤害后气井产能难以恢复,采用基于小油管的排采接替工艺可以实现致密气井全生命周期低成本、高效开采。为了给科学制定致密气井小油管柱塞气举工作制度提供参考,建立了柱塞气举上行阶段的柱塞-液段力学模型,分析了小油管柱塞气举上行的摩擦阻力,以及小油管柱塞气举运行的工作压力。研究结果表明:①柱塞-液段的摩擦阻力受柱塞运动的速度影响较大,摩擦阻力比值是速度比值的1.85倍;②不同管径油管在相同的柱塞运动速度下,摩擦阻力的倍数关系相同;③相同的周期举升液量,油管直径越小,满足柱塞气举工作制度的运行套压越大。结论认为:①油管直径越小,柱塞-液段的摩擦阻力越大,以常规油管的柱塞速度推荐值修正1.9英寸小油管柱塞速度推荐值为150 m/min~215 m/min;②油管直径越小,相同周期排液量下满足柱塞气举工作制度的运行套压越大,小油管柱塞气举的周期排液量要适当减小。
Tight gas reservoirs are very easy to suffer from contamination,bringing about difficulties in productivity recov⁃ering after reservoir damage.However,a new drainage-production replacement process based on narrow tubing may achieve the low-cost and high-efficiency development in tight gas wells during their whole life cycle.So,a mechanical model of plunger-liquid sectionwas established in the ascending stage of plunger lift,and not only frictional resistance dur⁃ing the ascending of plunger lift based on narrow tubing but working pressure in this lift were analyzed in an effort to pro⁃vide decision-making reference for preparing its working system for these wells.Results show that(i)the frictional resis⁃tance in the plunger-liquid section is affected more by the plunger's movement velocity,and the resistance ratio is 1.85 times of velocity ratio;(ii)at the same movement velocity,tubing with different diameters has the same multiple relation⁃ship of frictional resistance;and(iii)as for lifting-liquid volume at the same cycle,the smaller the tubing diameter,the higher the operating casing pressure to meet the working system.In conclusion,the smaller the diameter,the larger the frictional resistance of plunger-liquid section.The recommended plunger velocity of 1.9″narrow tubing corrected according to the recommended plunger velocity of conventional tubing is from 150 m/min to 215 m/min.What's more,as for liquiddrainage volume at the same cycle,the smaller the diameter,the higher the operating casing pressure to meet the working system,so the cyclic liquid-drainage volume of plunger lift based on narrow tubing shall be reduced appropriately.
作者
耿洁
刘金海
韦涛
刘世界
高涛
GENG Jie;LIU Jinhai;WEI Tao;LIU Shijie;GAO Tao(CNOOC Energy Technology&Services-Oil Production Services Co.,Tianjin 300450,China)
出处
《天然气技术与经济》
2023年第4期45-50,共6页
Natural Gas Technology and Economy
基金
中海油能源发展股份有限公司科技重点攻关项目“致密气井智能柱塞气举排水工艺技术研究及应用”(编号:HFKJ-ZDGG-CY-2021-02)。
关键词
致密气井
柱塞气举
小油管
工艺因素
Tight gas well
Plunger lift
Narrow tubing
Process factor
作者简介
耿洁(1982-),工程师,主要从事非常规油气开发生产技术研究与管理。E-mail:gengjie3@cnooc.com.cn。
