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Design and Construction of a Density Prob with Experimental Measurments

Rafizade, Abolfazl | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49128 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sohrabpour, Mostafa
  7. Abstract:
  8. In this project a dual density logging tool has been designed and constructed for measuring the bulk density of a formation using gamma rays. One of the main applications of this tool is obtaining porosity. It also is useful in the detection of formations containing oil and gas. In this work, MCNP Monte Carlo code was used to simulate the performance of the scattered gamma rays under various sond-formation parametric condition. The results coming from this code are applied to determine the fundamental parameters of gamma-gamma density tools like, Energy window, thickness of lead, optimum distance between each detectors. Furthermore, a novel method based on summation of back scatter and absorption rays is introduced.The best shaping time is determined to correct the errors which are derived from pulse pile up, the best shaping time is determined, consequently, combining this time with MCNP4C results, a Monte Carlo based code is used.Four samples of the homogeneous different area to test the density probe have been prepared. The cylindrical sond is entered into them and the surrounding formation is subjected to the emitted gamma rays from the source. The formation density can be determined from the measurement of the scattered photons reaching the detector from the formation. The calibration curves including the count rate of each of detectors versus density are obtained by these experimental tests. In addition, through this way, the accuracy of the MCNP4C result is tested
  9. Keywords:
  10. Detector ; Calibration Curve ; Densitometer Tool ; Monte Carlo N-Particle (MCNP)Code ; Densitometer Probe ; Nuclear Well Logging

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