基于分布式光纤缠绕技术的油水两相测量  

Oil-water two-phase measurement based on distributed fiber winding technology

作　　者：樊林玉 梁磊[1] 贾庆升 张雷 刘明 戴澍 FAN Linyu;LIANG Lei;JIA Qingsheng;ZHANG Lei;LIU Ming;DAI Shu(National Engineering Research Center of Fiber Optic Sensing Technology and Networks,Wuhan University of Technology,Wuhan,Hubei 430070,China;SINOPEC Research Institute of Petroleum Engineering Shengli Oilfield Company,Dongying,Shandong 257000,China)

机构地区：[1]武汉理工大学光纤传感技术与网络国家工程研究中心,湖北武汉430070 [2]中石化胜利油田分公司石油工程技术研究院,山东东营257000

出　　处：《光电子．激光》2024年第7期737-744,共8页Journal of Optoelectronics·Laser

基　　金：三亚崖州湾科技城科研项目(SKJC-2020-01-016,SKJC-KJ-2019KY02);中国石化重点项目(P21052)资助项目。

摘　　要：油水两相的流量与相含率测量一直以来都是石油开发的难点,本文提出将分布式光纤声波传感(distributed acoustic sensing, DAS)技术用于油水两相流体的油管管壁信号的采集与传输,湍流涡流作用和流体声波信号的叠加可使管壁缠绕的光纤发生轴向拉伸,测得光纤相位幅值用于计算混合流量与相含率。为了提高光纤对振动信号的测量精度,设计了一种缠绕光纤传感模型,分析了缠绕螺距与紧密缠绕的圈数两个参数对管壁振动幅值与声波沿光纤轴向传播速度的影响,实验验证了其中3种缠绕方式,可知间隔螺距0.02 m紧密缠绕4圈时可以更准确实现管壁振动与流体声波传播速度的测量,测得的光纤相位幅值标准差与管内流量曲线拟合度均达94%,计算的声速与含油率的关系曲线与理论完全相符。It is always been the difficulty to measure flow rate and phase content ratio of oil-water two-phase flow for the petroleum development.In this paper,the distributed acoustic sensing(DAS)technology is proposed for the acquisition and transmission of oil-water two-phase flow vibration signals of pipe wall.Axial stretching of the winding fiber consists two components:turbulent eddies vibration and sound speed of the turbulent flow.Then the mixing flow rate and phase content ratio are calculated by the fiber phase amplitude.To improve the sensitivity of vibration signal measurement with fiber,a winding fiber sensing model is proposed.We analyze the effects of two parameters,winding pitch and the number of tightly winding turns,on the vibration amplitude of the pipe wall and the sound speed along the axial direction of winding fiber,and experimentally verify three of the winding methods.It turns to more accurately measure the vibration of the pipe wall and the sound speed of the fluid with the winding method of 4 tightly winding turns at a pitch of 0.02 m.TheR2 of fitting curves between the standard deviation of the fiber phase amplitude and the flow velosity within the pipe reaches 94%,and the calculated relationship between sound speed and oil content ratio is fully consistent with the theory.

关 键 词：油水两相 流量与相含率 分布式光纤 缠绕方式 

分 类 号：TB937[一般工业技术—计量学]