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[1]刘迪,樊建春,刘书杰,等.基于ACF-AMDF的气井环空液面回波特征提取方法[J].中国安全生产科学技术,2018,14(9):63-68.[doi:10.11731/j.issn.1673-193x.2018.09.010]
　LIU Di,FAN Jianchun,LIU Shujie,et al.Method of extracting echo characteristics of annular liquid level in gas well based on ACF-AMDF[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2018,14(9):63-68.[doi:10.11731/j.issn.1673-193x.2018.09.010]
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基于ACF-AMDF的气井环空液面回波特征提取方法
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
14
期数:
2018年9期
页码:
63-68
栏目:
学术论著
出版日期:
2018-09-30

文章信息/Info

Title:
Method of extracting echo characteristics of annular liquid level in gas well based on ACF-AMDF
文章编号:
1673-193X(2018)-09-0063-06
作者:
刘迪1; 樊建春1; 刘书杰2; 王晨宇1; 文敏2
（1.中国石油大学（北京） 机械与储运工程学院，北京102249；2. 中海油研究总院，北京 100027)
Author(s):
LIU Di1;  FAN Jianchun1;  LIU Shujie2;  WANG Chenyu1;  WEN Min2
(1. College of Mechanical and Transportation Engineering, China University of Petroleum （Beijing）, Beijing 102249, China;2. CNOOC Research Institute, Beijing 100027, China)
关键词:
气井; 环空液位; 回波周期; 短时自相关函数; 平均幅度差函数
Keywords:
gas well;  annular liquid level;  echo period;  short time autocorrelation function (ACF);  average magnitude difference function (AMDF)
分类号:
X937；X924.2
DOI:
10.11731/j.issn.1673-193x.2018.09.010
文献标志码:
A
摘要:
为了精确有效地提取声波法检测气井环空液位的回波周期，在分析环空中测试波的传播特征及基音周期检测的基础上，提出1种基于检测信号短时自相关函数(ACF)及平均幅度差函数(AMDF)的液面回波周期提取方法；利用自主搭建的室内模拟实验系统开展了不同初始环空压力下环空液位检测实验；对检测信号进行中心削波处理并计算ACF/AMDF，提取出液面回波周期并与理论计算值对比分析；同时分析了现场环空液位检测信号，提取其回波周期。研究结果表明：提出的新方法能有效地用于提取环空液面回波周期；室内实验中，该方法最大误差绝对值为1.54%；该方法能够有效抑制液面回波信号中的随机噪声及接箍反射波等，处理后的信号曲线在回波周期处峰值更加突出、集中，而在其他位置更加平滑，提高了对液面回波周期特征的辨识能力。
Abstract:
In order to accurately and effectively extract the echo period when measuring the annular liquid level in gas well by the acoustic wave method, a method of extracting the echo period of liquid level based on the short time autocorrelation function (ACF) and the average magnitude difference function (AMDF) of detection signals was put forward on the basis of analyzing the propagation characteristics and pitch period detection of the testing wave in the annulus. The experiments of annular liquid level detection under different initial annulus pressures were carried out by using the selfdeveloped laboratory simulation experimental system. The center clipping processing was conducted on the detection signals, and the ACF/AMDF were calculated, then the echo period of liquid level was extracted and compared with the theoretical calculation value. Meanwhile, the onsite detection signals of annular liquid level were analyzed, and the echo period was extracted. The results showed that the proposed new method could be used to extract the echo period of annular liquid level effectively. The absolute value of the maximum error by this method in the laboratory experiments was 1.54%. The random noise and coupling echo of the echo signals of liquid level could be effectively suppressed by this method, and the signal curve after processing had the more prominent and concentrated peak value at the echo period, while smoother at other positions, which improved the identification ability of the echo period characteristic of liquid level.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期： 2018-05-28
基金项目： 国家重点研发计划课题(2017YFC0804500);中海油科研项目（YXKY-2017-ZY-09）
作者简介： 刘迪，博士研究生，主要研究方向为安全监测与智能诊断工程。
通信作者： 樊建春，博士，教授，主要研究方向为安全检测与监控、石油石化安全技术、机械设备状态监测与故障诊断。
更新日期/Last Update: 2018-10-09