Global Patent Index - EP 0399987 A1

EP 0399987 A1 1990-11-28 - 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

EP 0399987 A1 (EN)

Application

EP 90870079 A

Priority

DE 3916704 A

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

E21B 17/02; E21B 47/12; H01F 23/00

IPC 8 full level

E21B 17/02 (2006.01); E21B 47/12 (2012.01); E21B 47/18 (2012.01)

CPC

E21B 47/18 (2013.01); E21B 17/028 (2013.01); E21B 47/122 (2013.01); H01F 2038/143 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IT LI LU NL SE

DOCDB simple family

EP 0399987 A1 19901128; DE 3916704 A1 19891214; EP 0426820 A1 19910515; EP 0426820 B1 19960117; WO 9014497 A2 19901129; WO 9014497 A3 19910110