Abstract
The maximum distance at which an electromagnetic (EM) logging while drilling (LWD) tool can sense a formation boundary is considered to be the depth of detection (DOD). A new transient directional EM LWD measurement that is designed for look-around deep-detection is discussed here. A resistivity mode based on coaxial transmitter-receiver is defined and a late-time resistivity algorithm is applied to converse the time-domain voltage to time-domain apparent resistivity response. A boundary detection mode based on two transmitters and two receivers (2T2R) configuration with tilted receivers are defined as well. Numerical simulation results show that compared to the time-harmonic measurements, DOD of this time-domain EM LWD method can reach several tens of meters with an adequate compact spacing. Directional sensitivity depending on the polarity of time-domain geosignal curves is also included, which contributes to the wellbore trajectory control. Considering the anisotropy in high angle and horizontal wells, by studying the diffusion of eddy current induced by a horizontal transient magnetic dipole, it is found that the smoke ring in anisotropic formation gradually takes a preferred horizontal path with time. Since this diffusion has a close connection to the transient response, time-domain resistivity and geosignal curves are mainly contributed by the horizontal and vertical resistivity of the layer where the tool is located as well as the horizontal resistivity of the shoulder bed, while influence from the vertical resistivity of the shoulder bed can almost be neglected. TEM logging possesses a great potential in deep-reading with a relatively short transmitter-receiver spacing, and this study is expected to assist in the development of time-domain EM geosteering technology.
Copyright 2022, IFEDC Organizing Committee
This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Acknowledgments
The project is supported by the Science and Technology Research Project of Sinopec in China (Number JP22503, P21080), China Postdoctoral Science Foundation (Number 2022M713462) and the National Natural Science Foundation of China (Number 42074134).
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Wu, Bz., Yuan, Xy., Guo, Tz., Li, Yh., Wei, W., Deng, Sg. (2023). Look-Around Detection Performances of a New Transient Directional Electromagnetic Measurement. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_11
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DOI: https://doi.org/10.1007/978-981-99-1964-2_11
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