西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (3): 138-141.DOI: 10.3863/j.issn.1674-5086.2009.03.032

• 石油机械工程及其它 • 上一篇    下一篇

钻井液连续脉冲信号频域传输速度计算模型

王翔   

  1. 中国石油大学石油工程学院,山东 东营 257061
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-06-20 发布日期:2009-06-20

TRANSMISSION VELOCITY MODEL IN FREQUENCY DOMAIN OF DRILLING-FLUID CONSECUTIVE PULSE SIGNAL

WANG Xiang   

  1. School of Petroleum Engineering,China University of Petroleum,Dongying Shandong 257061,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-20 Published:2009-06-20

摘要:

在随钻测量系统中,连续脉冲信号传输方式为调相传输模式。考虑到传输系统粘性频率特性,适用于调幅传输模式的脉冲信号时域传输速度模型将不再适用。从瞬变流瞬时流动分析入手,结合传输线理论,引入复频率概念,建立了脉冲信号传输频域传输速度模型,得出了钻井液流体的特征阻抗和传播算子。并根据工程实际进行了线性摩擦假设,给出了钻井液脉冲传输过程频域模型的具体计算方法。

关键词: 复频率, 调相传输, 频域, 传输线理论, 线性摩擦假设, 钻井液

Abstract:

In the measurement while drilling system,the transport method of consecutive pulse is phase modulation.Considering viscosity and frequency feature of transmission system,the model in time domain is not suitable for the phase modulation.In this paper,starting with the analysis of transient flow,combining with the theory of transmission line,the concept of complex frequency is introduced,the calculating model of frequency domain for the pulse velocity in drilling fluid built and the impendence and transmission operator of drilling fluid obtained.With the hypothesis of linear friction,the calculating method for the frequency domain model is obtained.

Key words: complex frequency, phase modulation, frequency domain, theory of transmission line, linear friction, drilling fluids

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