Method and apparatus for imaging earth formation

Details Method and apparatus for imaging earth formation Method and apparatus for imaging earth formation

2007-09-04

2007-09-04

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S374000

Reexamination Certificate

active

10563900

ABSTRACT:
The invention concerns an apparatus for investigating the wall of a borehole tilled with non-conductive mud, said apparatus comprising: a pad having an inside face and an outside face for pressing against the wall of the borehole; a set of measurement electrodes mounted on the outside face of the pad, potentials differences being measured between said measurement electrodes in order to provide measured points representative of the resistivity of the formation; both a source electrode and a return electrode adapted to inject current into the formation, the set of measurement electrodes being situated between the source electrode and the return electrode.

REFERENCES:
patent: 4468623 (1984-08-01), Gianzero et al.
patent: 4567759 (1986-02-01), Ekstrom et al.
patent: 5502686 (1996-03-01), Dory et al.
patent: 6191588 (2001-02-01), Chen
patent: 6891377 (2005-05-01), Cheung et al.
patent: 2002/0153896 (2002-10-01), Yuratich et al.
GB 2 377 996 cited in the UK Search Report, Jan. 2003.
EP 0 426 564 cited in the UK Search Report, May 1991.

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