EP 0887511 B1 20030903 - Method and system for the detection of the precession of a drill string element
Title (en)
Method and system for the detection of the precession of a drill string element
Title (de)
Verfahren und Vorrichtung zur Erfassung der Präzession eines Bohrstrangelementes
Title (fr)
Méthode et système de détection de la précession d'un élément d'une garniture de forage
Publication
Application
Priority
FR 9707931 A 19970625
Abstract (en)
[origin: EP0887511A1] The method of detecting the precession of a drilling element rotating in a shaft involves acquiring at least one measure from measuring devices placed near the surface, representing the vibration of the element in the shaft. This measurement is then automatically treated to produce a mean location and a significant ray in the spectrum of this measurement, the location being checked at intervals of less than 10 seconds. A precession criterion is determined from the characteristics of this ray, and an alarm is set off if the criterion reaches a predetermined threshold value. Also claimed is a system for detecting the precession of a drilling element using the above method.
IPC 1-7
IPC 8 full level
E21B 44/00 (2006.01)
CPC (source: EP US)
E21B 44/00 (2013.01 - EP US)
Designated contracting state (EPC)
GB IT NL
DOCDB simple family (publication)
EP 0887511 A1 19981230; EP 0887511 B1 20030903; CA 2240479 A1 19981225; CA 2240479 C 20071002; FR 2765264 A1 19981231; FR 2765264 B1 19990806; NO 982936 D0 19980624; NO 982936 L 19981228; US 5999891 A 19991207
DOCDB simple family (application)
EP 98401475 A 19980617; CA 2240479 A 19980623; FR 9707931 A 19970625; NO 982936 A 19980624; US 10352998 A 19980624