CA2254490A1 - Method and apparatus for investigating earth formations - Google Patents

Method and apparatus for investigating earth formations

Info

Publication number
CA2254490A1
CA2254490A1 CA 2254490 CA2254490A CA2254490A1 CA 2254490 A1 CA2254490 A1 CA 2254490A1 CA 2254490 CA2254490 CA 2254490 CA 2254490 A CA2254490 A CA 2254490A CA 2254490 A1 CA2254490 A1 CA 2254490A1
Authority
CA
Canada
Prior art keywords
current
formations
signal
monitor
electrode
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA 2254490
Other languages
French (fr)
Other versions
CA2254490C (en
Inventor
Brian Clark
Stephen D. Bonner
Jacques Jundt
Martin Luling
Richard A. Rosthal
Abdullah A. Bagersh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger Canada Ltd
Original Assignee
Individual
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 US07/786,137 external-priority patent/US5235285A/en
Priority claimed from US07/955,101 external-priority patent/US5339037A/en
Application filed by Individual filed Critical Individual
Priority claimed from CA 2081790 external-priority patent/CA2081790C/en
Publication of CA2254490A1 publication Critical patent/CA2254490A1/en
Application granted granted Critical
Publication of CA2254490C publication Critical patent/CA2254490C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Geophysics And Detection Of Objects (AREA)

Abstract

Apparatus and method are disclosed for determining the resistivity of formations surrounding an earth borehole.
An electrically conductive metal body, such as a drill collar on a drill string, is movable through the borehole. A
transmitting toroidal coil antenna is disposed on the body and is energized to induce a current which travels in a path that includes the body and the formations. An electrode is disposed on the body, and a first signal which depends on the electrical effect of the current on the electrode is measured to obtain an indication of the resistivity of the formations.
In a form of the invention, a second transmitting toroidal coil antenna establishes a second current in the body that travels in a path that includes the body and the formations, and a second signal is measured at the electrode. A current monitor measures the axial current passing a monitor position on the body, to obtain a monitor current value. A compensated indication of formation resistivity can then be obtained as a function of the first signal, the second signal, and the monitor current value. A local communication system facilitates the ultimate communication of information to the earth's surface.
CA002254490A 1991-10-31 1992-10-30 Method and apparatus for investigating earth formations Expired - Lifetime CA2254490C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US07/786,137 US5235285A (en) 1991-10-31 1991-10-31 Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations
US786,137 1991-10-31
US07/955,101 US5339037A (en) 1992-10-09 1992-10-09 Apparatus and method for determining the resistivity of earth formations
US955,101 1992-10-09
CA 2081790 CA2081790C (en) 1991-10-31 1992-10-30 Method and apparatus for investigating earth formations

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA 2081790 Division CA2081790C (en) 1991-10-31 1992-10-30 Method and apparatus for investigating earth formations

Publications (2)

Publication Number Publication Date
CA2254490A1 true CA2254490A1 (en) 1993-05-01
CA2254490C CA2254490C (en) 1999-08-24

Family

ID=27169230

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002254490A Expired - Lifetime CA2254490C (en) 1991-10-31 1992-10-30 Method and apparatus for investigating earth formations

Country Status (1)

Country Link
CA (1) CA2254490C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10982529B2 (en) 2017-01-31 2021-04-20 Halliburton Energy Services, Inc. Incorporating mandrel current measurements in electromagnetic ranging inversion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10982529B2 (en) 2017-01-31 2021-04-20 Halliburton Energy Services, Inc. Incorporating mandrel current measurements in electromagnetic ranging inversion

Also Published As

Publication number Publication date
CA2254490C (en) 1999-08-24

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry