Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1986-08-20
1988-11-22
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324373, 175 45, G01V 320, E21B 4702
Patent
active
047868740
ABSTRACT:
A device for detecting and sensing the boundaries between differing rock strata is provided. This device utilizes electrical conductivity or resistivity to detect and measure the boundary layer. The device of the present invention may be used with a "measurement-while-drilling" (MWD) tool, using either wire-line or wireless data communication with a surface receiver. Moreover, the resistivity or conductivity detection device of the present invention may also be used alone or in conjunction with gamma radiation sensors. The present invention utilizes at least a pair of electrodes which occupy a small area and are located on one side of the tool aligned with the longitudinal axis thereof. Thus, in drilling a well along a specific formation stratum (which may be horizontal or inclined), the present invention will act to indicate to the driller whether the drill bit is approaching a stratum boundary, and in which direction that boundary lies. With this information, the driller can take appropriate action to change the direction of the well bore as necessary to achieve the preselected and desired path.
REFERENCES:
patent: 2650067 (1953-08-01), Martin
patent: 3311876 (1967-03-01), Lee
patent: 3388325 (1968-06-01), Birdwell et al.
patent: 3488574 (1970-11-01), Tanguy
patent: 4216536 (1980-08-01), More
patent: 4618828 (1986-10-01), Raynal
Duckworth Allen
Grosso Donald S.
Eisenzopf Reinhard J.
Snow Walter E.
Teleco Oilfield Services Inc.
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