水平井隨鉆電磁波電阻率數(shù)值模擬
[Abstract]:With the development of drilling technology, the resistivity of electromagnetic wave while drilling increases gradually. Because the measuring environment of horizontal well is different from that of vertical well, the influence factors of instrument are different from that of vertical well. It is helpful to interpret logging data in horizontal wells to determine the logging response law of electromagnetic wave resistivity while drilling in horizontal wells. According to the principle of electromagnetic wave resistivity measurement and Chew theory, the wave field decomposition of electromagnetic field in TI medium is deduced, and the forward modeling method of three-dimensional electromagnetic wave resistivity numerical simulation is established. The logging response law of electromagnetic wave resistivity under different working frequency, different relative well angle, different wall rock resistivity and formation interface is simulated. The results show that the amplitude ratio and phase difference decrease with the increase of the formation resistivity, showing a monotone decline function relationship with the formation resistivity, and the sensitivity of the phase difference to the formation resistivity is obviously better than that of the amplitude ratio. The larger the well inclination angle, the higher the resistivity contrast between the upper and lower strata, the easier it is to produce "polarization angle" near the layer interface, which is helpful to identify the formation interface; the same working frequency, The influence of surrounding rock on amplitude attenuation resistivity is greater than that of phase difference resistivity; the influence of surrounding rock on low frequency working mode is greater than that on high frequency working mode in the same measuring way; with the increase of inclined angle of well, the influence of surrounding rock on amplitude attenuation resistivity is greater than that of phase difference resistivity. The amplitude attenuation resistivity is separated from the phase resistivity, and the higher the working frequency, the greater the separation degree of the resistivity values with different distance.
【作者單位】: 中國(guó)石化石油勘探開(kāi)發(fā)研究院;
【基金】:國(guó)家科技重大專(zhuān)項(xiàng)(2016ZX05002-005-001,2016ZX05014-002-001)資助
【分類(lèi)號(hào)】:P631.81
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