恒温差热式流量计分段PID控制的仿真与实验  

Simulation and Experimental Research on Segmented PID Control of Constant Temperature Differential Thermal Flowmeter

作　　者：张夷非 魏勇[1] 余厚全[1] 陈强 刘国权 贺飞 ZHANG Yifei;WEI Yong;YU Houquan;CHEN Qiang;LIU Guoquan;HE Fei(Electronics&Information School,Yangtze University,Jingzhou,Hubei 434023,China;Production Logging Center,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710077,China)

机构地区：[1]长江大学电子信息学院,湖北荆州434023 [2]中国石油集团测井有限公司生产测井中心,陕西西安710077

出　　处：《测井技术》2021年第3期284-289,共6页Well Logging Technology

基　　金：国家科技重大专项“多维高精度成像测井系列”(2017ZX05019001)。

摘　　要：针对低产液油井井下流量在线检测难题,鉴于热式流量计对低速流动流量变化敏感,根据恒温差热式流量计的测量原理,通过井筒获取的实际数据,利用MATLAB软件仿真建立系统模型。在此基础上,针对仪器响应速度较慢的问题,采用分段增量式数字比例积分微分控制(PID控制)算法替代常规PID控制算法,进行系统恒温差控制过程的系列仿真。基于仿真结果,在实际模型中进行实验验证。结果表明,分段PID控制算法较常规PID控制算法更为优越,能加快恒温差热式流量计测量的响应速度,提高分辨精度,为恒温差热式流量计在低产液井中流量的在线检测提供有效的控制算法。Aiming at the problem for online-detection of downhole flow in low liquid production wells,in view of the high resolution of thermal flowmeter in low flow detection,this paper establishes the simulation model with MATLAB through the actual experimental data,based on the measurement principle of the constant temperature differential thermal flowmeter.On this foundation,considering the slow response speed of the constant temperature difference measurement instrument,we use the segmented PID algorithm instead for the conventional incremental PID algorithm to carry out a series of simulation for the system and veritf it with actual model.The results show that the segmented PID algorithm is superior to the conventional PID algorithm,which can accelerate the measurement response speed and improve the resolution accuracy of the constant temperature differential thermal flowmeter.The segmented PID algorithm provide an effective temperature difference control algorithm for the realization of online-detection of flow in stripper wells.

关 键 词：热式流量计 恒温差 低流量 分段PID控制 MATLAB仿真 

分 类 号：P631.84[天文地球—地质矿产勘探]