EP 2691797 A1 20140205 - SYSTEMS AND METHODS FOR RANGING WHILE DRILLING
Title (en)
SYSTEMS AND METHODS FOR RANGING WHILE DRILLING
Title (de)
SYSTEME UND VERFAHREN ZUR ORTUNG BEIM BOHREN
Title (fr)
SYSTÈMES ET PROCÉDÉS POUR L'ÉVALUATION DE DISTANCE PENDANT LE FORAGE
Publication
Application
Priority
US 2011030639 W 20110331
Abstract (en)
[origin: WO2012134468A1] An improved system and method for ranging while drilling, in effect, induces a dynamic hot spot on the casing of a nearby well. The induced hot spot acts as a magnetic source that can be reliably detected from within the drillstring and in such a manner as to infer the relative position and orientation of the casing to the drillstring. At least some disclosed method embodiments employ one or more rotating magnets in the drillstring, an array of at least two magnetometers in the drillstring and one or more phase-locked loops that are used to enhance the signal to noise ratio of the magnetic signal scattered off of the casing from the rotating magnetic field. The rotating magnet or magnets may be magnetic dipoles or magnetic multipoles, and may be modulated to enable the use of multiple magnetic field sources.
IPC 8 full level
E21B 7/04 (2006.01); E21B 47/022 (2012.01); E21B 47/09 (2012.01); G01V 3/00 (2006.01)
CPC (source: EP)
E21B 7/04 (2013.01); E21B 47/0228 (2020.05); E21B 47/092 (2020.05)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2012134468 A1 20121004; EP 2691797 A1 20140205; EP 2691797 A4 20151111; EP 2691797 B1 20190220
DOCDB simple family (application)
US 2011030639 W 20110331; EP 11859018 A 20110331