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Transform of Downhole's Information to Acoustic Signals in Smart Drilling

Honarmand, Hajar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43241 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Manzuri, Mohammad Taghi
  7. Abstract:
  8. Drilling in oil industry, is an expensive process in produce and extract oil from well. Any mistake in drilling may cause many drawbacks for industry owners. Phisic’s quantities information at downhole like tempreture, pressure and force on bit synchronously can inform user from torrid conditions and prevent undesired events by actions like evoke bit from downhole or change at rotation velocity in drilling and finally stop operations. With attention to a lot of problems in data transport from long distance more than one kilometer from downhole, scientists believe that one of the methods to do this process is converting data gathered at the bottom hole to acoustic waves and transmit them to the surface. The scope of this thesis is to simulate an acoustic waveguide in order to transmite and receive modulated acoustic waves at the top of the well.
    Pipelines are used for transmitting modulated acoustic waves, because transmitting the radio frequency under the ground is not possible. In order to compensate ambient noise, high frequency wave was sent in this simulation. The results of this research show that the frequency of the transmitted waves along the drillstring containing fluids like water, air and drilling mud despite dispersion phenomenon remains unchanged and this shows the power of acoustic telemetry in very long distances even more than one kilometer. In addition, it is indicated that attenuation effect reduces the amplitude of the acoustic waves which were sent to the hole. It is noted that by modulation we can preserve the shape of these waves so they are recognizable in the hole
  9. Keywords:
  10. Drill String ; Vibration ; Down-Hole Measurement ; Vibration Mode ; Smart Driling ; Acoustic Telemetry

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