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Electromagnetic method for determining dip angles independent of mud type and borehole environment

A technology of electromagnetic energy and azimuth, which is applied in electric/magnetic detection for well logging, electromagnetic wave detection, earthwork drilling and mining, etc. It can solve the problem of not being able to provide the azimuth information of the subgrade structure, and not being able to accurately determine the inclination, etc. question

Inactive Publication Date: 2005-02-16
SCHLUMBERGER OVERSEAS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this tool is non-directional in nature and therefore cannot provide azimuthal information about the bed configuration
Therefore, current commercial wireline entry tools and LWD propagation resistivity tools cannot accurately determine dip

Method used

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  • Electromagnetic method for determining dip angles independent of mud type and borehole environment
  • Electromagnetic method for determining dip angles independent of mud type and borehole environment
  • Electromagnetic method for determining dip angles independent of mud type and borehole environment

Examples

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Embodiment Construction

[0097] Figure 3 shows a conventional drill rig and drill string in which the present invention can be used to advantage. The land-based platform and lifting equipment 10 are located on a borehole 11 penetrating the subterranean formation F. In the example shown, the borehole 11 is formed by rotary drilling in a known manner. Those of ordinary skill in the art will also have the benefit of this disclosure that the present invention also finds application in directional drilling applications as well as rotary drilling and is not limited to land based drilling rigs. It should also be understood that the present invention is not limited to "logging while drilling" applications, but also utilizes logging wireline applications (discussed below).

[0098]A drill string 12 is suspended within the borehole 11 and includes a drill bit 15 at its lower end. The drill string 12 is rotated by a wheel 16 energized by means not shown, which engages a driving drill rod 17 at the upper end of...

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PUM

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Abstract

A method employs an apparatus for generating a directional signal associated with the electromagnetic energy response of a subsurface formation. The method is useful to derive both the strike angle of formation boundary and the relative dip. The true dip and azimuth can be computed from the relative dip information coupled with borehole orientation. Other applications of the method are also described.

Description

[0001] References to related applications [0002] This application claims priority under 35 U.S.C. §119 to Provisional Application Serial No. 60 / 493,747, filed August 8, 2003, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates generally to the field of well logging. More specifically, the present invention relates to an improved technique in which a device equipped with an antenna system having a lateral or inclined magnetic dipole moment behavior is used for electromagnetically detecting subsurface formations and for defining reservoir bed structures and formation inclinations , and setting wells relative to the geological boundaries in the reservoir. Background technique [0004] Information to determine dip in subsurface formations of interest is important for understanding the depositional environment of sedimentary rocks and for developing and executing drilling programs for oil and gas exploration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/18G01V3/28
CPCG01V3/28G01V3/30
Inventor D·奥梅拉吉克Q·李L·仇L·杨C·B·刘J·斯米茨
Owner SCHLUMBERGER OVERSEAS SA
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