A Perturbation Method to Model Electromagnetic Well-Logging Tools in Curved Boreholes

作者：Rosa Guilherme S^*; Bergmann Jose R; Teixeira Fernando L

来源：IEEE Transactions on Geoscience and Remote Sensing, 2018, 56(4): 1979-1993.

DOI：10.1109/TGRS.2017.2771723

• Directional wells
• multilayered media
• well logging

Logging-while-drilling (LWD) or measuring-while-drilling tools are routinely used to guide well placement during exploration of hydrocarbons reservoirs. These tools have become fundamental for directional and horizontal drilling operations. In this paper, we present a perturbation method to model electromagnetic fields produced by time-harmonic sources in radially stratified and axially toroidal structures describing LWD tools inside curved boreholes (i.e., boreholes with axial bending). The proposed formulation is validated against brute-force finite-difference results in various representative scenarios. Numerical results indicate that the proposed perturbative approach can provide a reduction in the computational effort required to analyze this class of problems of several orders of magnitude versus brute-force approaches.

• 出版日期2018-4