EP 0399987 A1 19901128 - Device and method for signal transmission in drill stems.
Title (en)
Device and method for signal transmission in drill stems.
Title (de)
Apparat und Verfahren zur Signalübertragung in Bohrgestängen.
Title (fr)
Appareil et procédé pour transmettre un signal dans la tige de forage.
Publication
Application
Priority
DE 3916704 A 19890523
Abstract (en)
Device for signal transmission in drill stems consisting of pipes (4), characterized in that the device comprises electrically interconnected induction loops (1) located in such a way that loops (1) of two pipes (4) between which the signal has to be transmitted are placed opposite each other and are coupled with a transformer coupling.
IPC 1-7
IPC 8 full level
E21B 17/02 (2006.01); E21B 47/12 (2012.01); E21B 47/18 (2012.01)
CPC (source: EP US)
E21B 17/0283 (2020.05 - EP US); E21B 47/13 (2020.05 - EP); E21B 47/18 (2013.01 - EP); H01F 2038/143 (2013.01 - EP)
Citation (search report)
- [X] US 2379800 A 19450703 - HARE DONALD G C
- [X] US 4605268 A 19860812 - MEADOR RICHARD A [US]
- [X] US 2414719 A 19470121 - CLOUD RAYMOND T
- [Y] WO 8801096 A1 19880211 - CONTROLOGY LTD [GB]
- [A] FR 2165074 A5 19730803 - DROGO PIERRE
- [XP] DE 3916704 A1 19891214 - WELLHAUSEN HEINZ [DE]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0399987 A1 19901128; DE 3916704 A1 19891214; EP 0426820 A1 19910515; EP 0426820 B1 19960117; WO 9014497 A2 19901129; WO 9014497 A3 19910110
DOCDB simple family (application)
EP 90870079 A 19900522; DE 3916704 A 19890523; EP 9000837 W 19900523; EP 90908523 A 19900523