EP 0440123 B1 19940518 - Apparatus for transmitting signals in a bore-hole.
Title (en)
Apparatus for transmitting signals in a bore-hole.
Title (de)
Vorrichtung zur Übertragung von Signalen in einem Bohrloch.
Title (fr)
Dispositif pour la transmission de signaux dans un trou de forage.
Publication
Application
Priority
DE 4002795 A 19900131
Abstract (en)
[origin: CA2035412A1] The present invention discloses an apparatus for drilling holes in various ground formations using a drill string including an inner flow cavity surrounded by an inner pipe and an outer pipe surrounding the inner pipe to form an outer flow cavity. In order to ensure electrical data transmission in a wear-free manner and to ensure easy installation, the inner and outer pipes are designed as mutually insulated electrical conductors to transfer measurement and control signals between the ground surface and the bottom of the hole during drilling. The pipes are braced against each other by electrically nonconducting spacers and are connectable to electrically operated measurement and control devices.
IPC 1-7
IPC 8 full level
E21B 17/00 (2006.01); E21B 17/18 (2006.01); H01R 4/60 (2006.01)
CPC (source: EP)
E21B 17/003 (2013.01); E21B 17/18 (2013.01); H01R 4/60 (2013.01)
Designated contracting state (EPC)
BE FR GB NL
DOCDB simple family (publication)
DE 4002795 C1 19910523; CA 2035412 A1 19910801; EP 0440123 A1 19910807; EP 0440123 B1 19940518
DOCDB simple family (application)
DE 4002795 A 19900131; CA 2035412 A 19910131; EP 91101043 A 19910128