Electronic measurement apparatus movable in a cased borehole and

Details Electronic measurement apparatus movable in a cased borehole and Electronic measurement apparatus movable in a cased borehole and

1989-11-13

1991-12-24

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324371, G01V 324

Patent

active

050756265

ABSTRACT:
Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. The invention also discloses multiple frequency methods of operation resulting in improved accuracy of measurement while the apparatus is simultaneously moved vertically in the cased well. The multiple frequency methods of operation disclose a first A.C. current having a first frequency that is conducted from the casing into formation and a second A.C. current having a second frequency that is conducted along the casing. The multiple frequency methods of operation simultaneously provide the measurement step and two compensation steps necessary to acquire accurate results while the apparatus is moved vertically in the cased well.

REFERENCES:
patent: 2729784 (1956-01-01), Fearon
patent: 2891215 (1959-06-01), Fearon
patent: 4796186 (1989-01-01), Kaufman
patent: 4820989 (1989-04-01), Vail, III
patent: 4837518 (1989-06-01), Gard et al.
patent: 4882542 (1989-11-01), Vail, III
Porter et al., "New Device that `Sees` through Old Well Casings Could Help Find Missed Oil and Gas Supplies", DOE News, Sep. 1, 1989.
Kaufman, "The Electrical Field in a Borehole with a Casing", Geophysics, vol. 55, No. 1, Jan. 1990, pp. 29-38.
Petroleum Engineer International, Feb. 1990, p. 52.
IEEE Spectrum, Jan. 1990, p. 19.
New York Times, Jan. 28, 1990, p. 8F.
Oil and Gas Journal, Sep. 11, 1989, p. 24.
Power Engineering, Oct. 1989, p. 6.
Fossil Energy Review, Jul.-Aug., 1989, pp. 12-13.

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