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EM telemetry assessment for horizontal drilling in part of the Tarim basin through numerical simulation
Author(s) -
Fayemi Olalekan,
Di Qingyun,
Zhen Qihui
Publication year - 2019
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.14108
Subject(s) - borehole , telemetry , geology , drill string , drilling , drill , tarim basin , antenna (radio) , attenuation , magnetotellurics , measurement while drilling , acoustics , electrical resistivity and conductivity , geotechnical engineering , electrical engineering , engineering , optics , mechanical engineering , telecommunications , paleontology , physics
Electromagnetic telemetry is bi‐directional transmission of borehole data for effective drilling, especially in unconventional wells. In this study, numerical simulations was used to investigate the possibility of applying EM telemetry for measurement while drilling (MWD) in an ultra‐deep borehole in the Tahe region of the Tarim basin, using the drill string as an antenna excited as a gaped dipole source to quantify spatial variations of the electromagnetic field from subsurface to the surface. Results confirm that the distribution of the electric field along the drill string is sensitive to vertical variations of electric conductivity in the host rock. The simulated results show a high attenuation within the conductive formations, thereby limiting the effectiveness of EM telemetry in data transfer to the surface. In addition, the changes in thickness and resistivity of the target region affects the amplitude of the desired response.