Introduced:
09/25/2012 09:26 AM

Scientific excellence of the master's thesis

Scientific excellence of the master's thesis made in cooperation between BTH and the University of Alberta

Daniel Oloumi student of the master's program in Electrical Engineering with emphasis on radio communication finished his thesis "Oil Well Monitoring by Ultra-Wideband Ground Penetrating Synthetic Aperture Radar" during this summer. The thesis has been done in cooperation with one of the major equipment suppliers to the oil companies, and has already presented on one of the biggest scientific conferences in the field.

Oil well monitoring is very important for the oil and gas industry. Therefore in this thesis, new ultra-wideband (UWB) ground penetrating radar (GPR) system for detection of near wellbore formation damage is introduced. The proposed GPR uses ground penetrating synthetic aperture radar (GPSAR) and a new developed transverse electromagnetic (TEM) horn antenna to increase GPR image resolution. The work has therefore been divided in two parts of synthetic aperture radar (SAR) processing of ground penetrating data and TEM horn antenna design as UWB transceiver for this system.

Aperture

 

SAR

In the first part GPR data is processed with SAR to achieve better horizontal resolution. The results show that the combination of GPR and SAR is a good solution to achieve high resolution images in both range and cross range (directions of the oil well axis). This method is very beneficial in borehole radar imaging where use of a big antennas to achieve high resolution in cross range direction is not feasible.

In the second part of thesis, a TEM horn antenna is designed that fits into the oil well. A new profile for TEM horn antenna is introduced to remove the ripples and dips in antenna mainlobe radiation pattern which is normally a problem with this type of UWB horns. The designed antenna is simulated and fabricated and the measurement results fully verify the simulation results.

Future work will be on extracting materials electromagnetic properties like dielectric constant and loss tangent by inverse scattering techniques from the recorded data by the GPSAR system. This work would be very interesting for companies who are working on geology and underground material investigation.

In future work the antenna design will be very important since the antenna is one of the most critical parts of UWB radar systems. Therefore, investigations of antenna impulse response enhancement and antenna performance estimation will be made.

This work is a result of cooperation between BTH and University of Alberta in Canada, and Daniel has been working with his thesis on both places.

On the following link you can find the whole thesis:

http://www.bth.se/fou/cuppsats.nsf/1d345136c12b9a52c1256608004f0519/973ceecc9db50753c1257a69005be607!OpenDocument

 

Source:
School of Engineering

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