Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2006-06-20
2006-06-20
Patidar, Jay M. (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C324S358000
Reexamination Certificate
active
07064551
ABSTRACT:
Process for determining the resistivity (Rt) of a formation (9) surrounding a well (10) equipped with a casing (11) consisting of several casing segments (11.i, 11.s) with an overlapping part (1), and cement (3) in the overlapping part (1),in which a current is injected into the casing (11) to cause a leakage current (Ifor) into a area (8) of the formation (9) offset from the overlapping part (1), the leakage current (Ifor) in the measurement area (8) is determined and is used to deduce the measured resistivity (Rm) of the formation,a current is injected into the casing (11) to cause a current leakage (Icem) in the cement (3) of the overlapping part (1), the leakage current (Icem) in the cement (3) in the overlapping part (1) is determined, and is used to deduce the measured resistivity (Rcem) of the cement (3),the measured resistivity (Rm) of the formation (9) is corrected using a factor to take account of the measured resistivity (Rcem) of the cement (3) to obtain the resistivity (Rt) of the formation (9).Application particularly to oil exploration.
REFERENCES:
patent: 4820989 (1989-04-01), Vail, III
patent: 5642051 (1997-06-01), Babour et al.
patent: 6987386 (2006-01-01), Vail, III
patent: 2001/0026156 (2001-10-01), Olivier et al.
patent: 2360849 (2001-10-01), None
Aulia et al., Resistivity Behind Casing, Oilfield Review, pp. 2-25.
Dubourg Isabelle
Faivre Ollivier
Rouault Gilles
Echols Brigitte L.
Patidar Jay M.
Schlumberger Technology Corporation
Segura Victor H.
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