DocumentCode :
41069
Title :
A Borehole Fluid Saturation Evaluation Method Using Unidirectional Monopole UWB Antenna
Author :
Wang, Bingdong ; Li, Kaicheng ; Kong, Fanqi ; Zhao, Junhua ; Gao, Yuan
Volume :
12
Issue :
2
fYear :
2015
fDate :
Feb. 2015
Firstpage :
429
Lastpage :
433
Abstract :
A method based on a unidirectional monopole ultrawideband antenna was proposed to evaluate the fluid saturation around borehole. The spectrum span of the excitation signal covered 750 MHz to 2.5 GHz and the slot antenna was optimized to transmit lateral wave more efficiently. The pulsed evaluation method offers more superiority when compared with the electromagnetic propagation tool and dielectric tools based on discrete frequencies. Measurement of complex permittivity in a wideband spectrum provides more accurate fluid saturation evaluation around the borehole. This method has been proven to operate effectively in a borehole filled with oil-based mud and to launch enough wave energy into the formation directionally. In addition, the proposed scheme is verified by using finite-difference time-domain method, and the simulation results show that this design adapts to evaluation of the fluid saturation and the detection of formation boundary. This scheme may be used as an alternative tool for logging while drilling the imaging application.
Keywords :
Antennas; Dielectric measurement; Dielectrics; Dispersion; Permittivity; Reservoirs; Time-domain analysis; Complex permittivity; dielectric tool; fluid saturation; ultrawideband (UWB) antenna;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
Publisher :
ieee
ISSN :
1545-598X
Type :
jour
DOI :
10.1109/LGRS.2014.2333588
Filename :
6882133
Link To Document :
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