Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-10-30
1988-12-27
Paschall, M. H.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 65R, G01R 2702
Patent
active
047943220
ABSTRACT:
Systems, for investigating casings which are fitted into boreholes that traverse earth formations and which are suitable for use in evaluating and/or optimizing the cathodic protection of casings and for finding the location and rate of casing corrosion, generally includes a downhole tool capable of investigating the casing along a measurement control unit located around the surface of the earth formation, and a cable having one end connected to the downhole tool and the other connected to the measurement control unit, with the cable including at least a plurality of first connection lines. The tool invention generally includes at least a first pair of longitudinally spaced electrodes, at least a pair of second connection lines, each of the second connection lines having one end connected to a corresponding one of the electrodes, and relays interposed between the first connection lines and the second connection lines. The relays are arranged such that in a first position, the first connection lines of the cable are short-circuited, and in a second position, the first connection lines are connected to their corresponding second connection lines thereby establishing an electrical connection between the measurement control unit and the electrodes. Accurate corrected high resolution potential difference and casing resistance measurements are so obtained. Likewise, contact resistance measurements can be made and used to perform a quality control screening of the other measurements.
REFERENCES:
patent: 2371658 (1945-03-01), Stewart
patent: 2459196 (1949-01-01), Stewart
patent: 2553350 (1951-03-01), Bayhi
patent: 3548362 (1970-12-01), Blank
patent: 4431963 (1984-02-01), Walkow
patent: 4431964 (1984-02-01), Walkow
Aguilar, J. R. "Redisenan Medidor de Potencial", Petroleo Int., Jan. 1976, pp. 33-36.
Aguilar, J. R. "Diseno y Aplicacion de un Dispositivo de Registro de Potencial Diferencial Para Estudio de Fugas de Corriente o Interferencia Exterior en Tuberias de Revestimiento en Pozos Petroleros", Ingenieria Petrolera, Apr. 1975, pp. 159-171.
Kirklen, C. A., "Evaluation and Design Considerations for Cathodic Protection of Well Casings", Proceedings of 17th Annual Appalachian Underground Corrosion Short Course, Engineering Experiment Station Bulletin, No. 106, 1972, pp. 545-554.
Gordon David P.
Lee Peter Y.
Paschall M. H.
Schlumberger Technology Corp.
Smith Keith G. W.
LandOfFree
Method, system, and tool for investigating borehole casings does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method, system, and tool for investigating borehole casings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method, system, and tool for investigating borehole casings will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-869809