Recherche Images Maps Play YouTube Actualités Gmail Drive Plus »
Recherche avancée dans les brevets | Historique Web | Connexion

Brevets

Référencé par

Brevet citant Date de dépôt Date de délivrance Cessionnaire d'origine Titre
US42862171 févr. 197925 août 1981Schlumberger Technology CorporationDevice for electrode-type electrical logging tools and tool incorporating said device
US449617430 janv. 198129 janv. 1985Tele-Drill, Inc.Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
US458918723 janv. 198420 mai 1986Teleco Oilfield Services Inc.Method of manufacturing an insulating coupling for drill collars
US467477319 nov. 198523 juin 1987Teleco Oilfield Services Inc.Insulating coupling for drill collars and method of manufacture thereof
US471502214 juil. 198622 déc. 1987Scientific Drilling InternationalDetection means for mud pulse telemetry system
US471697315 déc. 19865 janv. 1988Teleco Oilfield Services Inc.Method for evaluation of formation invasion and formation permeability
US490577427 mai 19876 mars 1990Institut Francais du PetroleProcess and device for guiding a drilling tool through geological formations
US551496314 oct. 19937 mai 1996Prakla-Seismos GmbHMethod for monitoring an area of the surface of the earth
US615082217 juil. 199521 nov. 2000Atlantic Richfield CompanySensor in bit for measuring formation properties while drilling
US657215221 déc. 20003 juin 2003Ryan Energy Technologies Inc.Subassembly electrical isolation connector for drill rod
US671213924 sept. 200230 mars 2004Saudi Arabian Oil CompanyMethod of well casing cathodic protection optimization using the drill stem data
US709368023 déc. 200322 août 2006Weatherford/Lamb, Inc.Subsurface signal transmitting apparatus
US718931918 févr. 200413 mars 2007Saudi Arabian Oil CompanyAxial current meter for in-situ continuous monitoring of corrosion and cathodic protection current
US724302814 juin 200510 juil. 2007Weatherford/Lamb, Inc.Methods and apparatus for reducing electromagnetic signal noise
US725216030 juil. 20047 août 2007Weatherford/Lamb, Inc.Electromagnetic gap sub assembly
US73013459 sept. 200527 nov. 2007Schlumberger Technology CorporationWhile-drilling methodology for estimating formation pressure based upon streaming potential measurements
US732601530 août 20055 févr. 2008Hydril Company LLCElectrically insulated wedge thread connection
US73871671 juil. 200217 juin 2008Maxwell Downhole Technology, LtdInsulating device and assembly
US73883809 sept. 200517 juin 2008Schlumberger TechnologyWhile-drilling apparatus for measuring streaming potentials and determining earth formation characteristics and other useful information
US74661369 sept. 200516 déc. 2008Schlumberger Technology CorporationWhile-drilling methodology for determining earth formation characteristics and other useful information based upon streaming potential measurements
US75863109 sept. 20058 sept. 2009Schlumberger Technology CorporationWhile-drilling apparatus for measuring streaming potentials and determining earth formation characteristics and other useful information
US790096813 févr. 20078 mars 2011Schlumberger Technology CorporationElectrical isolation connector for electromagnetic gap sub
US81301178 juin 20076 mars 2012Schlumberger Technology CorporationDrill bit with an electrically isolated transmitter
USRE324636 nov. 197928 juil. 1987Norton Christensen, Inc.Method of and apparatus for telemetering information from a point in a well borehole to the earth's surface

Dessins