科研之友
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摘要
Special requirements for design of tools used for wireline NMR logging and NMR logging while drilling and for interpretation model are demanded due to the dispersion properties of NMR relaxation for crude oil. NMR longitudinal relaxation time (T-1) and transverse relaxation time (T-2) of the dead oil samples with different viscosities were measured by NMR spectrometers with a Larmor frequency of 2 MHz and 23 MHz at five different temperatures respectively. The results showed that T-1 was obviously dependent on the Larmor frequency of NMR spectrometer. The degree of T-1 dispersion became stronger with the increasing crude oil viscosity, Larmor frequency and the viscosity/temperature ratio. T-2 was independent of NMR spectrometer measuring frequency. It is suggested that the resonance frequency should be selected lower than 2 MHz when measuring T-1 in logging while-drilling and that T-1 dispersion should be corrected when Larmor frequency is higher than 2 MHz.
- 出版日期2007
- 单位中国石油大学（北京）
