Title:
坑井遠隔測定システム
Document Type and Number:
Japanese Patent JP2010517394
Kind Code:
A
Abstract:
An EM antenna for location on a pipe surrounded by a casing. The antenna has a power source for injecting a current across a first insulated section of the pipe and an electrode for conducting the current from the pipe to the casing. There is also a second insulated section of the pipe arranged to operate together with the electrode and first insulated section for directing a path flow of the current. Such antennas are described both in relation to repeater arrangements as well as land and sea applications.
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Inventors:
Masse, Contin
Erwan, Lumenage
Eve, Mathieu
Sylvan, Chambon
Erwan, Lumenage
Eve, Mathieu
Sylvan, Chambon
Application Number:
JP2009546696A
Publication Date:
May 20, 2010
Filing Date:
January 21, 2008
Export Citation:
Assignee:
SCHLUMBERGER HOLDINGS LIMITED
International Classes:
H01Q9/26; E21B47/12; G08C19/00
Domestic Patent References:
| JPH05225483A | 1993-09-03 | |||
| JPH026791A | 1990-01-10 |
Foreign References:
| US5576703A | 1996-11-19 | |||
| US3967201A | 1976-06-29 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Akaoka Akira
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Akaoka Akira