Method and apparatus for determining distance for magnetic and e

Details Method and apparatus for determining distance for magnetic and e Method and apparatus for determining distance for magnetic and e

1991-10-04

1993-06-08

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

32420726, 324366, 324368, G01V 320, G01V 326, G01B 714

Patent

active

052183017

ABSTRACT:
A method and apparatus for determining the distance from a relief borehole to a target well utilizes measurements of an electric field at the target well. The electric field is produced by injecting current into the earth near the wellhead of the target well, this current producing a target current in conductive material in the target well. The electric field corresponding to the target current is measured by means of sensors in the relief borehole, and this field measurement, together with a measurement of the alternating magnetic field at the relief well due to the target current, permits determination of the distance to the target well from the relief borehole.

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"Use of New Ranging Tool to Position a Vertical Well Adjacent to a Horizontal Well" B. A. Tarr Society of Petroleum Engineers SPE 20446 pp. 421-430, Sep. 1990.

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