Simulation of Bed Thickness Effect and Mechanism Analysis of
Electromagnetic Wave Resistivity Logging While Drilling in
Highly-deviated Wells

doi:10. 3863/j. issn. 1674 – 5086. 2013. 04. 010

Abstract

Abstract:

The method and model used in the logging interpretation and formation evaluation of highly-deviated and horizontal
wells are mainly based on vertical wells，which is not applicable to the actual conditions. The effect of bed thickness and
well deviation is always connected with electromagnetic wave while drilling resistivity logging. The instrument response was
obtained through fast Fourier-Hankel transform（FFHT）algorithm，and the influence of bed thickness was also analyzed with
different borehole angles. The results show that the shoulder effect on electromagnetic wave while-drilling logging curves is
different：the deeper the investigation goes，the more serious the shoulder effect is. The corrected deep phase resistivity does not
monotonously decrease with the increase of bed thickness in highly deviated wells with low resistivity shoulder. The corrected
resistivity is less in highly-deviated wells than in vertical wells when the bed thickness is small，and with the increase of bed
thickness，the corrected resistivity will be larger in highly-deviated wells than in vertical wells. These conclusions can be used
to guide the interpretation of electromagnetic wave while-drilling resistivity logging in highly-deviated wells.

Key words: highly-deviated well, electromagnetic wave logging resistivity while drilling, correction of bed thickness, instrument
response, polarization horn

Wen Yi,Han Xiaomei. Simulation of Bed Thickness Effect and Mechanism Analysis of
Electromagnetic Wave Resistivity Logging While Drilling in
Highly-deviated Wells[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 04. 010.

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