西南石油大学学报(自然科学版)

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Acoustic Communications Over Downhole Drill Strings Using#br# Adaptive BPSK

ZHOU Jing*, TIAN Huan, GAO Jianbang, QIU Bin   

  1. Research Institute of Down Hole Measuringand Control,Xi′ an Shiyou University,Xi′ an,Shaanxi 710065,China
  • Online:2016-04-11 Published:2016-04-11

Abstract:

Using acoustic waves to transmit downhole information through the drill-string transmission channel is a promising
approach that meets the requirements for the highspeed and large-volume data transmission in modern drilling. In the studies
about acoustic signal transmission channel characteristics and acoustic communication,we developed a mathematical channel
model for the description of a guided acoustic wave based on waveguide theory. To overcome the phase shift during transmission,
we applied BPSKand adaptive spread-spectrum communication system to detecting the phase shift of carrier,which
ensures correct data transmission. Field application shows that this method can realized high speed data transmissionwith high
reliability and low error rate. In this way,much higher data rates can be realized in future deep drilling applications. Drill string
acoustic telemetry is an effective transmission method to retrieve downhole data in drilling applications.

Key words: downhole drill string, adaptive spread-spectrum communication, acoustic telemetry, channel properties, data
rates

CLC Number: