EP 1390712 A4 20090708 - AN APPARATUS AND METHOD FOR WELLBORE RESISTIVITY DETERMINATION AND IMAGING USING CAPACITIVE COUPLING
Title (en)
AN APPARATUS AND METHOD FOR WELLBORE RESISTIVITY DETERMINATION AND IMAGING USING CAPACITIVE COUPLING
Title (de)
VORRICHTUNG UND VERFAHREN ZUR BOHRLOCH-WIDERSTANDSBESTIMMUNG UND -ABBILDUNG UNTER VERWENDUNG KAPAZITIVER KOPPLUNG
Title (fr)
APPAREIL ET PROCEDE POUR DETERMINER LA RESISTIVITE DES FORAGES ET IMAGERIE UTILISANT UN COUPLAGE CAPACITIF
Publication
Application
Priority
- US 0211727 W 20020415
- US 83698001 A 20010418
- US 35324502 P 20020201
- US 9037402 A 20020304
Abstract (en)
[origin: WO02086459A1] An apparatus for obtaining resistivity parameters of earth formations (7) uses capacitive coupling (5) for injecting measure currents into the formation through a nonconducting mud. In one embodiment, a modulated electrical current is used. Alternatively, multifrequency measurements may be made to obtain the resistivity parameter. In an optional embodiment, the modulation frequency is in the AF range, making it possible to use prior art circuitry designed to reduce cross talk. Measurements may be made either on a wireline or in a MWD configuration.
IPC 1-7
IPC 8 full level
G01V 3/24 (2006.01)
CPC (source: EP)
G01V 3/24 (2013.01)
Citation (search report)
- [Y] US 3973181 A 19760803 - CALVERT THOMAS J
- [Y] US 3539910 A 19701110 - HENRY LOUIS, et al
- [A] US 3928841 A 19751223 - VOGEL CHARLES B
- [A] SU 438964 A1 19740805
- [A] BURRUS B.: "Determination of Oil and Water Volumes By the Capacitance Method", SPE, SOCIETY OF PETROLEUM ENGINEERS, no. 1373, 28 April 1966 (1966-04-28) - 29 April 1966 (1966-04-29), pages 51 - 58, XP002529610
- See references of WO 02086459A1
Designated contracting state (EPC)
FR IT NL
DOCDB simple family (publication)
WO 02086459 A1 20021031; WO 02086459 B1 20030912; CA 2444942 A1 20021031; EP 1390712 A1 20040225; EP 1390712 A4 20090708; GB 0325864 D0 20031210; GB 2392729 A 20040310; GB 2392729 B 20050427; NO 20034635 D0 20031017; NO 20034635 L 20031127; NO 335831 B1 20150302
DOCDB simple family (application)
US 0211727 W 20020415; CA 2444942 A 20020415; EP 02726746 A 20020415; GB 0325864 A 20020415; NO 20034635 A 20031017