Title :
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
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;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2005 IEEE
Print_ISBN :
0-7803-8883-6
DOI :
10.1109/APS.2005.1552215
