Global Patent Index - EP 0947664 B1

EP 0947664 B1 20040825 - Method for monitoring a telescopic drill string and a protection device for a telescopic drill string

Title (en)

Method for monitoring a telescopic drill string and a protection device for a telescopic drill string

Title (de)

Verfahren zum Überwachen einer teleskopierbaren Bohrstange und Schutzvorrichtung für eine teleskopierbare Bohrstange

Title (fr)

Procédé de controle d'une tige de forage télescopique et dispositif de protection d'une tige de forage télescopique

Publication

EP 0947664 B1 20040825 (DE)

Application

EP 99104296 A 19990303

Priority

DE 19813902 A 19980328

Abstract (en)

[origin: DE19813902C1] The method involves measuring the required holding force for the rotary drive holder (8). This is compared with the theoretical pulling force based on the weight of the tubes (2,6,7). This force starts with the total weight of the tubes and is successively reduced to the weight of at least a further tube in dependence on the stroke distance covered. A signal is generated when the measured holding force falls to a predetermined value below the force corresponding to the respective stroke distance. Independent claims also cover a protective device for a telescopic tube.

IPC 1-7

E21B 17/07; E21B 19/08

IPC 8 full level

E21B 15/00 (2006.01); E21B 17/07 (2006.01); E21B 19/08 (2006.01)

CPC (source: EP)

E21B 17/07 (2013.01)

Designated contracting state (EPC)

AT DE FR IT

DOCDB simple family (publication)

DE 19813902 C1 19990617; AT 274634 T 20040915; DE 59910317 D1 20040930; EP 0947664 A2 19991006; EP 0947664 A3 20001206; EP 0947664 B1 20040825

DOCDB simple family (application)

DE 19813902 A 19980328; AT 99104296 T 19990303; DE 59910317 T 19990303; EP 99104296 A 19990303