NO893407L - APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION. - Google Patents

APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION.

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Publication number
NO893407L
NO893407L NO893407A NO893407A NO893407L NO 893407 L NO893407 L NO 893407L NO 893407 A NO893407 A NO 893407A NO 893407 A NO893407 A NO 893407A NO 893407 L NO893407 L NO 893407L
Authority
NO
Norway
Prior art keywords
antenna
inductive
examination
micro
antenna element
Prior art date
Application number
NO893407A
Other languages
Norwegian (no)
Other versions
NO893407D0 (en
Inventor
Robert L Kleinberg
Weng Cho Chew
Brian Clark
Douglas D Griffin
Donald G Dudley
Original Assignee
Schlumberger Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/616,327 external-priority patent/US4780678A/en
Priority claimed from US06/616,323 external-priority patent/US4712070A/en
Priority claimed from US06/616,326 external-priority patent/US4739272A/en
Priority claimed from US06/616,325 external-priority patent/US4845433A/en
Priority claimed from NO851741A external-priority patent/NO172086C/en
Publication of NO893407L publication Critical patent/NO893407L/en
Application filed by Schlumberger Ltd filed Critical Schlumberger Ltd
Priority to NO893407A priority Critical patent/NO893407D0/en
Publication of NO893407D0 publication Critical patent/NO893407D0/en

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  • Geophysics And Detection Of Objects (AREA)

Abstract

Et apparat av veggkontakt-typen for mikro-induktiv undersøkelse av en karakteristikk ved en grunnformasJon som gjennom- løpes av et borehull, omfatter et antennesett montert i et lang- strakt legeme anordnet for glidende kontakt med veggen i bore- hullet. Antennesettet omfatter et første antenne-element og andre og tredje antenne-elementer som har posisjoner og orien- teringer for å bringe dem i elektromagnetisk symmetri i forhold til det første antenne-element. Det er innbefattet anordninger for differensiell sammenkobling av det annet og det tredje antenne-element. Enten det første antenne-element eller de differensielt sammenkoblede andre og tredje antenne-elementer kan energiseres for å virke som en sender, mens de andre funk- sjonerer som en mottager for signaler som indikerer karakteri- stikken. Alternative variasjoner omfatter et .ledende legeme for fokusering av elektromagnetisk energi, et ledende bakplan son> muliggjør halvsløyfe-antenne-eleraenter og en elektro- kvasistacisk skjerm som forbedrer antennesettets ytelse.An apparatus of the wall contact type for micro-inductive examination of a characteristic of a basic formation traversed by a borehole comprises an antenna set mounted in an elongated body arranged for sliding contact with the wall of the borehole. The antenna set comprises a first antenna element and second and third antenna elements having positions and orientations to bring them in electromagnetic symmetry relative to the first antenna element. Devices for differential coupling of the second and third antenna elements are included. Either the first antenna element or the differentially interconnected second and third antenna elements can be energized to act as a transmitter, while the second functions as a receiver for signals indicating the characteristics. Alternative variations include a conductive body for focusing electromagnetic energy, a conductive backplane which enables half-loop antenna ele- rants, and an electro-quasi-static screen that improves antenna set performance.

NO893407A 1984-05-31 1989-08-24 APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION. NO893407D0 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO893407A NO893407D0 (en) 1984-05-31 1989-08-24 APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US06/616,327 US4780678A (en) 1984-05-31 1984-05-31 Apparatus for microinductive investigation of earth formations
US06/616,323 US4712070A (en) 1984-05-31 1984-05-31 Apparatus for microinductive investigation of earth formations
US06/616,326 US4739272A (en) 1984-05-31 1984-05-31 Apparatus for microinductive investigation of earth formations with improved electroquasistatic shielding
US06/616,325 US4845433A (en) 1984-05-31 1984-05-31 Apparatus for microinductive investigation of earth formations
NO851741A NO172086C (en) 1984-05-31 1985-05-02 APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION
NO893407A NO893407D0 (en) 1984-05-31 1989-08-24 APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION.

Publications (2)

Publication Number Publication Date
NO893407L true NO893407L (en) 1985-12-02
NO893407D0 NO893407D0 (en) 1989-08-24

Family

ID=27555239

Family Applications (1)

Application Number Title Priority Date Filing Date
NO893407A NO893407D0 (en) 1984-05-31 1989-08-24 APPARATUS FOR MICRO-INDUCTIVE EXAMINATION OF BASIC FORMATION.

Country Status (1)

Country Link
NO (1) NO893407D0 (en)

Also Published As

Publication number Publication date
NO893407D0 (en) 1989-08-24

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