1
Richard N Chandler, Richard A Rosthal: Induction logging method and apparatus including means for combining on-phase and quadrature components of signals received at varying frequencies and including use of multiple receiver means associated with a single transmitter. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, October 20, 1992: US05157605 (99 worldwide citation)

Induction logging apparatus is disclosed which depends for its operation not only upon its arrangement of coils, but also upon the skin depth of the formation. The skin effect of the formation is used advantageously by operating a simple induction sonde at a plurality of frequencies simultaneously. ...


2
Thomas D Barber, Richard N Chandler, John F Hunka: Induction logging sonde with metallic support. Schlumberger Technology Corporation, Henry N Garrana, Michael D Rostoker, March 17, 1987: US04651101 (76 worldwide citation)

Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side ...


3
Thomas D Barber, Richard N Chandler, John F Hunka: Induction logging sonde with metallic support having a coaxial insulating sleeve member. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, October 10, 1989: US04873488 (59 worldwide citation)

Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side ...


4
Richard N Chandler: System for permeability logging by measuring streaming potentials. Schlumberger Technology Corporation, Stephen L Borst, January 24, 1984: US04427944 (35 worldwide citation)

Method and apparatus for investigating earth formations according to the present invention include positioning an opening of a fluid reservoir in contact with the surface of an earth formation to be investigated and injecting the fluid at high pressures through the opening into the formation to caus ...


5
Richard N Chandler: Enclosed nuclear-magnetism logging tool with compensated coil-isolating system. Schlumberger Technology Corporation, Ernest R Archambeau Jr, William R Sherman, Stewart F Moore, July 12, 1977: US04035718 (20 worldwide citation)

In the representative embodiment of the present invention disclosed herein, a nuclear-magnetism logging tool is arranged with at least its polarizing and detecting coil isolated in an enclosed chamber containing a uniquely-treated hydrogenous oil and preferably coupled to a suitable compensating sys ...


6
Richard N Chandler: Nuclear magnetism logging method and system. Schlumberger Technology Corporation, November 20, 1979: US04175251 (2 worldwide citation)

A nuclear magnetism logging system and method is disclosed in which a surface unit provides power to, control of, and signal reception from a downhole sonde. The surface unit comprises a source of alternating current power and switching circuit means for applying a sequence of alternating current wa ...


7
John F Hunka, Richard N Chandler, Thomas D Barber: Induction logging sonde with metallic support. Schlumberger Overseas, ZHANG ZHIXING, October 29, 1986: CN85103932

This invention describer an inductive well-logging instrument containing transmitting and receiving solenoid coils which are fixed on the rack and axially separated with each other. The rack is made of conductive material. It includes at least a first longitudinal cylinder with coils fixed on it and ...