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1. (WO2004029663) DEVICE AND PROCESS FOR DETERMINATION OF THE RESISTIVITY OF A FORMATION SURROUNDING A CASED BOREHOLE

Pub. No.:    WO/2004/029663    International Application No.:    PCT/EP2003/010353
Publication Date: Fri Apr 09 01:59:59 CEST 2004 International Filing Date: Thu Sep 18 01:59:59 CEST 2003
IPC: G01V 3/20
Applicants: SERVICES PETROLIERS SCHLUMBERGER
SCHLUMBERGER TECHNOLOGY B.V.
SCHLUMBERGER HOLDINGS LIMITED
SCHLUMBERGER CANADA LIMITED
PETROLEUM RESEARCH & DEVELOPMENT N.V.
SCHLUMBERGER OVERSEAS S.A.
SCHLUMBERGER OILFIELD ASSISTANCE LIMITED
SCHLUMBERGER SURENCO S.A.
SCHLUMBERGER SERVICES LIMITED
SCHLUMBERGER SEACO INC.
BENIMELI, Dominique
LEVESQUE, Cyrille
MCKEON, Donald
Inventors: BENIMELI, Dominique
LEVESQUE, Cyrille
MCKEON, Donald
Title: DEVICE AND PROCESS FOR DETERMINATION OF THE RESISTIVITY OF A FORMATION SURROUNDING A CASED BOREHOLE
Abstract:
Body (22) for measuring the resistivity of a formation (9) surrounding a well (10) equipped with a lining (11), comprising: a body (23) of a probe (22), a set of three primary voltage measurement electrodes (ea, eb, ec), an upper electrode (ea) and a lower electrode (ec) and a central electrode (eb), two electrodes (Inl, In2), an upper current injection electrode (Inl) and a lower current injection electrode (In2) arranged on each side of the set of primary electrodes, characterized in that it also comprises, two secondary voltage measurement electrodes (24, 26) arranged on each side of the set of primary electrodes (ea, eb, ec), and between the two current injection electrodes (Inl, In2), the spacing between a secondary electrode (24, 26) and the closest primary end electrode (ea, ec) being more than 1.5 times the spacing between the primary electrodes (ea, eb, ec).