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Design and Construction of a Neutron Porosity Probe and Comparison of its Experimental Measurement with MCNP Simulation Results

Valadi, Ahmad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44214 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): SohrabPour, Mostafa
  7. Abstract:
  8. Today the hydrocarbon materials rank in the list of requirements of the modern societies. The increased growth of the human population, their industrial economic activities, transportation etc. requires sufficient supplies of our resources. Therefore, the hydrocarbon resources need to be discovered and evaluated accurately. There are different methods that are used to measure underground hydrocarbon resources such as well logging. In this method, a measuring device is lowered into a well to evaluate several parameter of the surrounding soil. Nuclear well logging is a sub category of well logging that uses nuclear rays to do this measurement. This method has different types of sondes which are lowered into wells to measure different aspects of the wells. Densitometer, neutron porosity tool, salinity meter, radioactivity measurement tool and spectrometry are all used in nuclear well logging. This project focuses on neutron porosity tool, its practical test, and simulation of its related behavior with the MCNP code.
    Neutron porosity tool has different parts including: a high energy neutron source like the 252CF, one or more detectors that are sensitive to low energy neutrons, the shields between the source and the detector, a collection of electronic circuits for receiving and processing of the signals, and a software which is used by the user to connect with the porosity tool and gather the related data.
    This project focuses on constructing the different components of the porosity tool, especially the software and the electronic systems. This tool consists of a pre-amplifier, a power supply, a high voltage power supply, an amplifier, a single channel analyzer, and a micro controller. All parts of this tool are designed and constructed in this project. Using C sharp programming language, a software was designed to connect the porosity tool. Finally, using MCNP code, complete simulations was done to evaluate the response of porosity tool under an experiment of calibration test rig
  9. Keywords:
  10. CF 252 Neutron Source ; Monte Carlo N-Particle (MCNP)Code ; Monte Carlo Simulation ; Nuclear Well Logging ; Neutron Porosity Tool

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