Response of tilted-coil antennas in multicylindrically layered media

Author

Hue, Y.-K. ; Teixeira, F.L. ; San Martin, L.E. ; Bittar, M.S.

Author_Institution

Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA

Volume

3A

fYear

2005

fDate

3-8 July 2005

Firstpage

208

Abstract

We analyze the response of tilted-coil antennas in multicylindrically layered media. The loop antennas have fixed radial size of 4.5 [in]. Both the axial and azimuthal angles of the antennas can be changed. The transmitter antenna is placed at the position z=0 [in]. The first and second receiver antennas are placed at the position z=30 and 24 [in], respectively. The operating frequency is 2MHz. We study the response of this tool in multilayered formations. Both a pseudo-analytical formulation extended to multicylindrically layered medium, and a full numerical formulation based on the finite-difference time-domain (FDTD), are used to analyze this problem and for cross-validation. The FDTD method here employs a three-dimensional (3D) cylindrical grid to better conform to the logging tool geometry.

Keywords

UHF antennas; finite difference time-domain analysis; inhomogeneous media; receiving antennas; transmitting antennas; well logging; 2 MHz; 3D cylindrical grid; FDTD method; finite-difference time-domain method; logging tool geometry; loop antennas; multicylindrically layered media; pseudo-analytical formulation; receiver antennas; three-dimensional cylindrical grid; tilted-coil antenna response; transmitter antenna; Differential equations; Drilling; Finite difference methods; Fresnel reflection; Laboratories; Nonhomogeneous media; Receiving antennas; Time domain analysis; Transmitters; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2005 IEEE

Print_ISBN

0-7803-8883-6

Type

conf

DOI

10.1109/APS.2005.1552215

Filename

1552215