Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1990-07-10
1991-09-03
Wieder, Kenneth A.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324339, 324369, 336229, G01V 328
Patent
active
050457950
ABSTRACT:
A coil array which is installed on a MWD drill collar for use in a resistivity logging system. The drill collar is provided with upper and lower coil support rings. These are toroids which support individual coil segments, and are connected by suitable magnetic shorting bars. The coil segments and shorting bars inscribe a specified solid angle or azimuthal extent. By connecting the outputs of the several coils through a combining circuit, the coils on a single coil form can be connected in series additive, or subtractive relationship. Through the use of two such coil forms with aligned coils on each, an azimuthally oriented window is thereby defined. By proper switching multiple azimuthally oriented windows can be made operative so that there is an azimuthal orientation to the current flow pattern relative to the MWD resistivity logging tool.
REFERENCES:
patent: 3305771 (1967-02-01), Arps
patent: 3377549 (1968-04-01), Newman et al.
patent: 3381215 (1968-04-01), Osborn
patent: 3408561 (1968-10-01), Redwine et al.
patent: 4786874 (1988-11-01), Grosso et al.
Chemali Roland E.
Gianzero Stanley C.
Sinclair Paul
Su Shey-Min
Beard William J.
Edmonds Warren S.
Halliburton Logging Services Inc.
Wieder Kenneth A.
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