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Fully Digital Implementation and Optimization of Openhole Oil Well Surface Modem

Shahbazi Dastgerdeh, Mehdi | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51576 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Movahedian, Hamid; Gholampour, Iman
  7. Abstract:
  8. Once a well has been drilled before it is cased with the steels (open-hole well), some logging must be done to record information’s about layers, geologic formations, geophysical and petrophysical properties of well. All the information’s that gathered from sensors and tools transmitted to the surface by a down-hole modem. This information is corrupted during the transmission by the communication channel. The most notable influence of this channel is noise, attenuation and interference between successive data bits. On the other hand, the characteristic of channel changes with the length of the cable, temperature, connections and so on. So using a set of fixed filters is not effective. The receiver modem on the surface must be able to correct the effect of the channel as the characteristic of the channel changes. The available modems are implemented in analogue and digital circuits. A major problem of these modems is size, instability and unchangeability in the case of changing down-hole tools and modem. The purpose of this implementation is creating a platform that can solve the available modems problems plus works with higher speed, upgradeable and can integrate other boards in one board. This proposed design makes it possible to use the modem even if the down-hole modem, tools or the protocol have changed. Finally, the proposed design has 220 times more speed for synchronization, 2.2 times less size, more than 20 times bit rates and costs 11 times less than the current modems
  9. Keywords:
  10. Modems ; Well Logging System ; Equalizer Clock ; Digital Implementation ; Clock Recovery

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