基于非均匀采样的模拟退火随钻电磁波电阻率测井检波系统研究
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摘要
在以往的随钻电磁波电阻率测井仪器检波系统中,仪器采样过程大多为均匀采样,检波方法多采用数字相关法或数字相敏检波(DPSD)法,其检波结果往往受采样量化误差以及频谱泄漏影响。针对这一问题,提出一种基于非均匀采样的模拟退火(SA)检波方法,并研制快速检波电路系统,选取基于均匀采样的DPSD检波结果进行对比。结果表明,基于非均匀采样的SA检波方法选频能力强,能更加有效地抑制量化误差相关性以及频谱泄漏带来的检波误差,更适用于恶劣多变环境下的随钻测井仪器检波。
Conventional demodulation systems of LWD electromagnetic resistivity logging use widely uniform sampling,and the measurements are usually processed using digital correlation or the digital phase sensitivity detector(DPSD) method.Consequently,the detection results are affected by the quantization error and the spectrum leakage in the sampling process.In this paper,an simulated annealing(SA) demodulation method based on nonuniform sampling is presented and a rapid detection circuit is designed.The detection results of the proposed method are compared with that of the DPSD methods with uniform sampling,and demonstrate that the former method has a strong frequency-selecting capacity,and the correlation with the quantization errors and the measurement errors brought by the spectrum leakage can both be suppressed effectively.This method is more suitable for demodulation systems of the LWD measurements in extreme environment.
Conventional demodulation systems of LWD electromagnetic resistivity logging use widely uniform sampling,and the measurements are usually processed using digital correlation or the digital phase sensitivity detector(DPSD) method.Consequently,the detection results are affected by the quantization error and the spectrum leakage in the sampling process.In this paper,an simulated annealing(SA) demodulation method based on nonuniform sampling is presented and a rapid detection circuit is designed.The detection results of the proposed method are compared with that of the DPSD methods with uniform sampling,and demonstrate that the former method has a strong frequency-selecting capacity,and the correlation with the quantization errors and the measurement errors brought by the spectrum leakage can both be suppressed effectively.This method is more suitable for demodulation systems of the LWD measurements in extreme environment.
引文
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[11]尤嘉祺.随钻电磁波电阻率信号采集技术研究[D].青岛:中国石油大学,2013.YOU Jiaqi.Signal acquisition technology study of electromagnetic wave propagation resistivity tool of LWD[D].Qingdao:China University of Petroleum,2013.
[12]贾衡天,彭浩,邓乐,等.随钻电磁波电阻率测量系统[J].电子测量技术,2014,37(6):123-126.JIA Hengtian,PENG Hao,DENG Le,et al.Electromagnetic resistivity MWD system[J].Electronic Measurement Technology,2014,37(6):123-126.
[13]袁阿明.随钻电磁波传播测井井下电路研究[D].西安:西安石油大学,2009.YUAN Aming.Circuit design of electromagnetic wave propagation logging[D].Xian:Xian Shiyou University,2009.
[14]徐闽斌.基于电磁波传播理论的围岩电阻率测量方法研究与仪器实现[D].郑州:解放军信息工程大学,2009.XU Minbin.Research of formation resistivity measurement and implementation of corresponding equipment based on electromagnetic wave propagation theory[D].Zhengzhou:PLA Information Engineering University,2009.
[2]RAM D J,SREENIVAS T H,SUBRAMANIAM K G.Parallel simulated annealing algorithms[J].Journal of Parallel&Distributed Computing,1996,37(2):207-212.
[3]COOK R D,SAULNIER G J,GISSER D G,et al.ACT3:a high-speed,high-precision electrical impedance tomograph[J].IEEE Trans Biomed Eng,1994,41(8):713-722.
[4]LAAKSO T I,TARCZYNSKI A,MURPHY N P,et al.Polynomial filtering approach to reconstruction and noise reduction of nonuniformly sampled signals[J].Signal Processing,2000,80(4):567-575.
[5]DAI Yijun,BI Zhuo.CORDIC algorithm based on FPGA[J].Journal of Shanghai University,2011,15(4):304-309.
[6]李会银,苏义脑,盛利民,等.多深度随钻电磁波电阻率测量系统设计[J].中国石油大学学报(自然科学版),2010,34(3):38-42.LI Huiyin,SU Yinao,SHENG Limin,et al.Implementation of quadrature signal source based on CORDIC algorithm[J].Journal of China University of Petroleum(Edition of Natural Science),2010,34(3):38-42.
[7]何明,李英波,刘金柱.一种多频电磁波电阻率测量系统:204082133[P].2015-01-07.
[8]刘升虎,邢亚敏.随钻电磁波电阻率测井采集系统研究[J].西南石油大学学报(自然科学版),2007,29(5):25-29.LIU Shenghu,XING Yamin.A data acquisition system for electromagnetic propagation resistivity logging[J].Journal of Southwest Petroleum University(Science&Technology Edition),2007,29(5):25-29.
[9]刘升虎,邢亚敏.DPSD技术在随钻电阻率测井中的应用[J].测井技术,2008,32(1):69-71.LIU Shenghu,XING Yamin.Application of digital phase sensitive demodulation for electromagnetic propagation resistivity logging while drilling[J].Well Logging Technology,2008,32(1):69-71.
[10]徐闽斌,李建新,杨天池.微弱信号的相位检测技术研究[J].信息工程大学学报,2010,11(1):40-44.XU Minbin,LI Jianxin,YANG Tianchi.Research on the weak signal phase detection method[J].Journal of Information Enginering University,2010,11(1):40-44.
[11]尤嘉祺.随钻电磁波电阻率信号采集技术研究[D].青岛:中国石油大学,2013.YOU Jiaqi.Signal acquisition technology study of electromagnetic wave propagation resistivity tool of LWD[D].Qingdao:China University of Petroleum,2013.
[12]贾衡天,彭浩,邓乐,等.随钻电磁波电阻率测量系统[J].电子测量技术,2014,37(6):123-126.JIA Hengtian,PENG Hao,DENG Le,et al.Electromagnetic resistivity MWD system[J].Electronic Measurement Technology,2014,37(6):123-126.
[13]袁阿明.随钻电磁波传播测井井下电路研究[D].西安:西安石油大学,2009.YUAN Aming.Circuit design of electromagnetic wave propagation logging[D].Xian:Xian Shiyou University,2009.
[14]徐闽斌.基于电磁波传播理论的围岩电阻率测量方法研究与仪器实现[D].郑州:解放军信息工程大学,2009.XU Minbin.Research of formation resistivity measurement and implementation of corresponding equipment based on electromagnetic wave propagation theory[D].Zhengzhou:PLA Information Engineering University,2009.
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