Method of evaluating a geological formation using a logging tool

Details Method of evaluating a geological formation using a logging tool Method of evaluating a geological formation using a logging tool

1993-07-27

1995-04-11

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324335, 324343, G01V 330

Patent

active

054062063

ABSTRACT:
A slot antenna has a square aperture and two current probes at angles to each other in the aperture. The two current probes are excited simultaneously or separately with different signals. By adjusting the amplitude or phase of the signals in the current probes, the angle of the magnetic moment of the antenna can be adjusted. An array of such antennas in an electromagnetic propagation tool for a well-logging device simultaneously provides better standoff performance by adjusting tile magnetic moment to be parallel to a borehole axis, and better image response by adjusting the magnetic moment to be perpendicular to the formation bed. The array can be excited to function as an endfire and broadside array of an electromagnetic propagation tool.

REFERENCES:
patent: 2790138 (1957-04-01), Poupon
patent: 4360777 (1982-11-01), Segesman
patent: 4451789 (1984-05-01), Meador
patent: 4636731 (1987-01-01), Savage et al.
patent: 4704581 (1987-11-01), Clark
patent: 5066916 (1991-11-01), Rau

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