Electrical resistivity measurement of a flowing drilling fluid u

Details Electrical resistivity measurement of a flowing drilling fluid u Electrical resistivity measurement of a flowing drilling fluid u

1983-03-03

1985-08-20

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Including borehole fluid investigation

73153, 166250, 175 40, 324204, 324346, 324442, G01V 326, G01N 2774, E21B 4900

Patent

active

045367132

ABSTRACT:
A high permeability ferrite core, which includes a gap between adjacent ends thereof, is combined with a magnetic coil encircling the core, and is located in a sub positioned in the drill string just above the drill bit of a borehole drilling rig. The core is positioned so that the gap thereof lies across a recess region formed in the outer wall of the sub. Drilling fluids flow along the outer surface of the sub on the return path from the drill bit to the mud pits located at the surface of the borehole. A constant current, or voltage, at a frequency within the range of 20 KHz-20 MHz is applied to the terminals of the coil encircling the core and the eddy currents developed in the gap region produce a measurable back emf at the coil terminals. The current produced by this emf voltage is indicative of the resistivity of the drilling fluid within the recess region in the wall of the sub and the fluctuations of the voltage accurately follow the variations in drilling fluid resistivity.

REFERENCES:
patent: 2411696 (1946-11-01), Silverman et al.
patent: 2948847 (1957-05-01), Bravenec et al.
patent: 3059695 (1962-10-01), Barry et al.
patent: 3388323 (1968-06-01), Stripling
patent: 3701006 (1972-10-01), Volkel et al.
patent: 3714555 (1973-01-01), Greer
patent: 3720870 (1973-03-01), Sueda
patent: 3987362 (1976-10-01), McCann et al.
patent: 4019126 (1977-04-01), Meador
patent: 4100491 (1978-07-01), Newman et al.
patent: 4134059 (1979-01-01), Stankoff

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