光纤温压法实现油井动液面的实时监测  

Real-time Monitoring of Oil-well Dynamic Liquid-level with Pressure and Temperature Based on Optical Fiber Sensor

作　　者：张洪涛[1,2] 付威 王春骞[4] 张广玉[1] 王振龙[1] ZHANG Hong-tao;FU Wei;WANG Chun-qian;ZHANG Guang-yu;WANG Zhen-long(School of Mech.&Elec.Engineering,Harbin Institute of Technology,Harbin150001,China;Postdoc Station of Mechanical Engineering,Harbin Institute of Technology,Harbin150001,China;Well Testing and Perforating Service Sub-company of Daqing Oilfield,Daqing163513,China;No.5Oil Production Plant of Daqing Oilfield Company Ltd,Daqing163513,China)

机构地区：[1]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001 [2]哈尔滨工业大学机械工程博士后流动站,黑龙江哈尔滨150001 [3]大庆油田试油试采分公司,黑龙江大庆163513 [4]大庆油田第五采油厂规划设计研究所,黑龙江大庆163513

出　　处：《哈尔滨理工大学学报》2018年第6期1-6,共6页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51574098)

摘　　要：针对油井动液面不能实时监测的问题,采用一种将压力测量和温度剖面测量相结合的方法对油井动液面进行实时监测。设计了基于偏心推杆结构的光纤压力计,采用多模光纤测量温度剖面,根据温度剖面上的拐点确定动液面初始位置,通过初始压强及动液面初始位置计算井中液体密度,之后仅利用压力计随后测得的数据即可求出动液面的实时位置。实验结果表明,光纤压力计有很好的线性度和重复性,其线性度为0. 999,压力灵敏度达到230. 9 pm/MPa,满足井下压力测量要求,同时多模光纤所测温度剖面拐点明显,易于读取,将两种方法结合可对油井动液面数据进行实时准确的监测。Real-time monitoring of dynamic liquid-level of oil-well is very important in oilfield.A novel method combining pressure measurement and temperature profile measurement is proposed in this paper to measure dynamic liquid-level of oil-well in real-time.A fiber Bragg grating pressure sensor based on an eccentric-pushrod structure is used to measure downhole pressure,and the multimode fiber is used to measure temperature profile.The initial position of the dynamic liquid-level can be determined by the inflection point of the temperature profile.The density of the liquid in the well is calculated from the initial pressure and the initial position of dynamic liquid-level.Base on this data,the real-time position of the dynamic liquid-level can be obtained only by using the pressure data.Experimental results show that the method that the fiber Bragg grating sensor has a good linearity and repeatability,the sensitivity of the sensor can reach230.9pm/MPa wich meets the requirements of downhole pressure measurement,and the inflection point of the temperature profile measured by multimode fiber is obvious and easy to read.The combination of the two measurements methods can be used for real-time and accurate monitoring of oil well liquid level data.

关 键 词：光纤传感 光纤压力计 温度剖面 偏心推杆 实时动液面监测 

分 类 号：TN253[电子电信—物理电子学]