Logging method and device in well bores utilizing directional em

Details Logging method and device in well bores utilizing directional em Logging method and device in well bores utilizing directional em

1991-03-06

1993-05-25

Eldred, J. Woodrow

Acoustics

Geophysical or subsurface exploration

Well logging

181106, 367 25, 367 35, 367912, 73152, G01V 140

Patent

active

052142523

ABSTRACT:
A method of use of a logging tool (1) including a directional emission device (4) and/or reception device (R1, R2) and the achieving of several series of loggings while modifying between each series the orientation of the directivity diagrams. At least one first series is performed by orienting the directivity diagrams towards the top or the wall of a reservoir zone crossed through by the well bore, for example. At least one second series is carried out by orienting the directivity diagrams towards the opposite direction, for example. The recordings are then combined, and the reflected arrivals, which are generally concealed by casing waves, can be easily seen. This facilitates the locating of further discontinuities. The directional selectivity of the emissions and/or the receptions is, for example, obtained by positioning a cover fitted with a window (5) around emitting and/or receiving transducers. The method can be applied to loggings in horizontal well bores, for example.

REFERENCES:
patent: 3426865 (1969-02-01), Henry
patent: 3614891 (1971-10-01), Nolte
patent: 3781784 (1973-12-01), Desbrandes
patent: 3961683 (1976-06-01), Delignieres
patent: 4641724 (1987-02-01), Chow et al.
patent: 4690214 (1987-09-01), Wittrisch
patent: 4833658 (1989-05-01), Staron
patent: 4982381 (1991-01-01), Mari

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