摘要
近年来多数油田进入高含水开发阶段,分层注气成为进一步提高原油产量的重要手段。其中恒流堵塞器作为配水关键仪器,其气嘴尺寸、注入流体介质类型、井口压力等因素直接影响嘴损系数。利用数值模拟方法对不同因素影响下的恒流堵塞器装置进行计算,得到流体的速度、压力云图,分析CO_(2)注气时流域内气嘴嘴损系数的变化规律,确定嘴损系数与气嘴尺寸、入口压力的关系。分析结果表明:在相同气嘴尺寸的条件下,随着入口压力的增大,CO_(2)的性态由气态转变为液态,嘴损系数先单调递减后趋于平缓,通过设置合适的入口表压和气嘴尺寸可使恒流堵塞器的压力损耗达到最小。根据得到的嘴损系数变化规律,通过改变气嘴尺寸可实现CO_(2)注气井实时调控,对现场分层注入CO_(2)驱气嘴选配具有指导意义。
In recent years,most oilfields have entered the high-water cut development stage,and layered injection has become an important method to further increase crude oil production.The choke valve,as a key instrument for water distribution,is directly affected by factors such as nozzle size,injected fluid medium,and wellhead pressure,which have a significant impact on the nozzle loss coefficient.In this paper,numerical simulation is used to calculate the devices of choke valves under different influencing factors,and obtain velocity and pressure distribution maps of the fluid.The changes in the nozzle loss coefficient in the gas nozzle system during CO_(2) injection are analyzed,and the relationship between the nozzle loss coefficient and nozzle size and inlet pressure is determined.The analysis results show that under the same nozzle size,as the inlet pressure increases,the CO_(2) changes from gas phase to liquid phase,and the nozzle loss coefficient decreases monotonically and then tends to be flat.By setting appropriate inlet pressure and nozzle size,the pressure loss of the choke valve can be minimized.Based on the obtained variation law of the nozzle loss coefficient,real-time and accurate control of CO_(2) injection wells can be achieved by changing the nozzle size.The conclusions obtained have guiding significance for the selection and matching of gas nozzles for on-site layered CO_(2) injection.
作者
李烨烨
孟玟妤
杨韵桐
刘兴斌
LI Yeye;MENG Wenyu;YANG Yuntong;LIU Xingbin(School of Physics and Electronic Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;School of Information Science and Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)
出处
《测井技术》
CAS
2023年第6期701-709,共9页
Well Logging Technology
基金
国家自然基金面上基金项目“网络模型的智能分层注水井压力脉冲数据传输方法”(52174021)
黑龙江省大学生创新创业训练计划项目“分层注气井中恒流堵塞器水嘴嘴损系数影响因素及响应特性研究”(S202210220108)。
