EP 0816630 B1 20030521 - Method and system for real time estimation of at least one parameter connected to the performance of a downhole tool
Title (en)
Method and system for real time estimation of at least one parameter connected to the performance of a downhole tool
Title (de)
Verfahren und Einrichtung zur Echtzeit-Einschätzung von mindestens eines Parameters, der mit dem Verhalten eines Bohrlochwerkzeuges zusammenhängt
Title (fr)
Méthode et système d'estimation en temps réel d'au moins un paramètre lié au comportement d'un outil de fond de puits
Publication
Application
Priority
FR 9607913 A 19960624
Abstract (en)
[origin: EP0816630A1] The method of estimating the effective behaviour of a drill bit fixed at the end of a drill string and rotated in a shaft by surface motors, using a non linear physical model based on general mechanical equations with the following stages: the parameters of the model are identified taking into account the parameters of the shaft and the drill string; the model is reduced to a functional point; the linearised model is reduced, keeping only some of the proper modes of the matrix, and the displacement of or force on the drill bit is calculated in real time using the reduced model and at least one parameter measured at the surface. System of estimating the effective behaviour of such a drill bit using only the traction and compression of the drill string and the speed of rotation, vertical acceleration and/or the tension of the drill string.
IPC 1-7
IPC 8 full level
E21B 44/00 (2006.01); E21B 45/00 (2006.01)
CPC (source: EP US)
E21B 44/00 (2013.01 - EP US); E21B 45/00 (2013.01 - EP US)
Designated contracting state (EPC)
GB IT NL
DOCDB simple family (publication)
EP 0816630 A1 19980107; EP 0816630 B1 20030521; CA 2209059 A1 19971224; CA 2209059 C 20061121; FR 2750159 A1 19971226; FR 2750159 B1 19980807; NO 972931 D0 19970623; NO 972931 L 19971229; US 5844132 A 19981201
DOCDB simple family (application)
EP 97401298 A 19970609; CA 2209059 A 19970623; FR 9607913 A 19960624; NO 972931 A 19970623; US 88085897 A 19970623