Zoom guard resistivity logging system featuring resistogram prof

Details Zoom guard resistivity logging system featuring resistogram prof Zoom guard resistivity logging system featuring resistogram prof

1982-04-19

1984-11-20

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324347, 324355, G01V 324

Patent

active

044841396

ABSTRACT:
In a resistivity logging system, the preferred and illustrated embodiment features a downhole well logging tool utilizing central current emitting electrode flanked symmetrically with a number of small electrodes above and below the central electrode. A switching system is included for switching symmetrical pairs of electrodes into parallel with the central electrode thereby increasing the effective field acting on the current flow. The current flow penetrates radially outwardly into the earth's formations in relation to the relative length of the array of electrodes, thereby enabling a sweep to yield borehole resistivity and deep formation resistivity. The data is preferably presented in a resistogram profile.

REFERENCES:
patent: 2172778 (1939-09-01), Taylor
patent: 2183565 (1939-12-01), Hawley
patent: 2605321 (1952-07-01), Owen
patent: 2654064 (1953-09-01), Broding
patent: 2704347 (1955-03-01), Doll
patent: 2986693 (1961-05-01), Alder
patent: 3076138 (1963-01-01), Stelzer
patent: 3096477 (1963-07-01), Smith et al.
patent: 3902113 (1975-08-01), Bridges et al.
patent: 4412180 (1983-10-01), Desbrandes

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