【発明の名称】隣接する井戸間の距離を決定する方法 - Ciel Inter-National Lisa-Chi Ma-Toshat Pei Be-Vue-

Title:

【発明の名称】隣接する井戸間の距離を決定する方法

Document Type and Number:

Japanese Patent JPH0715235

Kind Code:

B2

Abstract:

The distance (d) between a first well (2) containing ferromagnetic parts (X) and a second well (1) is determined using an overlay technique whereby a plotted diagram representing the wavenumber spectrum of data measured in said second well (1) of a magnetic field surrounding said parts (X) and a plotted diagram representing the wavenumber spectrum of a theoretical magnetic field surrounding a single magnetic monopole or dipole are matched. The technique enables an accurate distance determination even if said ferromagnetic parts (X) form a complex pattern of magnetic poles.

Inventors:

Paul Austein Barnett
Paulus Hofstra
Bernd Christie Ahn Rail

Application Number:

JP13104387A

Publication Date:

February 22, 1995

Filing Date:

May 27, 1987

Export Citation:

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Assignee:

Ciel Inter-National Lisa-Chi Ma-Toshat Pei Be-Vue-

International Classes:

G01B7/00; G01B7/14; G01V3/26; E21B47/00; (IPC1-7): E21B47/00; E21B47/01

Other References:

【文献】米国特許3725777(US,A)

Attorney, Agent or Firm:

Yoshio Kawaguchi (1 person outside)

Next Patent: FREQUENCY SYNTHESIZER