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Simulation Study on Temperature Characteristics of Static Magnetic Field for NMR logging While DrillingChinese Full Text

BAO Zhongli;YU Huiyuan;XU Zheng;XU Xianneng;Well-Tech R&D Institute,China Oilfield Services Limited;School of Electrical Engineering, Chongqing University;

Abstract: In order to explore the temperature characteristics of the static magnetic field in the target area of the nuclear magnetic resonance(NMR) logging while drilling probe, based on the existing magnet system, firstly, the influence of each material in the magnet system on the static magnetic field is analyzed by simulation. The finite element simulation and measurement are utilized to obtain the static magnetic field variation of the same detection point at different temperatures, and the finite element simulation results are in good agreement with the measured results. The distribution of the effective area of NMR at different temperatures is analyzed through simulation. The distribution of the effective area is discussed under the two conditions of the center frequency of the NMR radio frequency field being constant and variable. Under the premise of keeping the effective area position unchanged, the focus is on the adjustment strategy of the corresponding radio frequency field center frequency. The results show that the static magnetic field simulation model of NMR logging while drilling can conveniently and effectively give the adjustment strategy of the center frequency for the radio frequency field with the temperature, and provide data reference for the optimization design and engineering application of the probe, which have practical guidance.
  • DOI:

    10.16489/j.issn.1004-1338.2021.05.002

  • Series:

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (A) Mathematics/ Physics/ Mechanics/ Astronomy

  • Subject:

    Geology; Petroleum, Natural Gas Industry

  • Classification Code:

    P631.81

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