CA2452120A1 - Relative drill bit direction measurement - Google Patents

Relative drill bit direction measurement Download PDF

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Publication number
CA2452120A1
CA2452120A1 CA002452120A CA2452120A CA2452120A1 CA 2452120 A1 CA2452120 A1 CA 2452120A1 CA 002452120 A CA002452120 A CA 002452120A CA 2452120 A CA2452120 A CA 2452120A CA 2452120 A1 CA2452120 A1 CA 2452120A1
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CA
Canada
Prior art keywords
borehole
magnetic field
point
axis
determining
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
CA002452120A
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French (fr)
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CA2452120C (en
Inventor
Arthur F. Kuckes
Rahn G. Pitzer
Anthony G. Nekut
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.)
Halliburton Energy Services Inc
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2452120A1 publication Critical patent/CA2452120A1/en
Application granted granted Critical
Publication of CA2452120C publication Critical patent/CA2452120C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes
    • E21B7/068Deflecting the direction of boreholes drilled by a down-hole drilling motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/02Determining slope or direction
    • E21B47/024Determining slope or direction of devices in the borehole

Abstract

Apparatus and Methods are disclosed for determining the direction between a rotating magnetic field and alternating magnetic field sensors at a remote location. The curvature of a borehole drilling assembly between a rotating drill bit (10) carrying a permanent magnet (50) and sensors (46) behind a drilling motor (16) is measured to provide early indication of changes in drilling direction. A second application concerns measurement of the convergence and divergence and the skewness of two approximately parallel we ll bores to provide information for correcting the drilling direction to mainta in parallelism. A third application measures the direction and distance to a point target to provide data for guiding drilling toward that target. The primary apparatus are an oriented, rotating permanent magnet (50) and an oriented, three component alternating magnetic field sensor.

Claims (23)

  1. What is claimed is:

    Apparatus for relative direction measurement, comprising:
    a magnetic field generator comprising first and second mutually perpendicular magnetic dipoles producing a rotating magnetic field having a source point and having a first axis passing through said point;
    a first sensor for determining the orientation in space of said field generator;
    a second sensor for measuring x, y and z vector components of said magnetic field at a second point spaced from said source point; and means for determining from said measured vector components a characteristic direction associated with said rotating field at said second point and for determining the relative orientation of said first axis with respect to said characteristic direction.
  2. 2. The apparatus of claim 1, wherein said magnetic field generator includes at least one rotating magnet.
  3. 3. The apparatus of claim 1, wherein said magnetic field generator comprises a magnetic field source mounted on an elongated bendable rotatable drilling assembly in a borehole operable for directional drilling of said borehole to produce curvature in said borehole, said first axis being substantially parallel to the direction of drilling said borehole, whereby the relative orientation of said first axis with respect to said characteristic direction is a measure of the curvature of said borehole.
  4. 4. The apparatus of claim 3, wherein said magnetic field generator comprises at least one permanent magnet mounted on a rotating portion of said drilling assembly for rotation therewith.
  5. 5. The apparatus of claim 4, wherein said second sensor is mounted on said drilling assembly at a location spaced from said permanent magnet.
  6. 6. The apparatus of claim 5, wherein said at least one permanent magnet is rotatable about said first axis.
  7. 7. The apparatus of claim 1, wherein said magnetic field generator is mounted on a drilling assembly in a first borehole and wherein said second sensor is located at a second point spaced from said first borehole.
  8. 8. The apparatus of claim 7, wherein said second point is at the earth's surface.
  9. 9. The apparatus of claim 7, wherein said second point is in a second borehole.
  10. 10. The apparatus of claim 9, wherein said second borehole is approximately parallel to said first borehole.
  11. 11. The apparatus of claim 9, further including means responsive to said measured vector components for determining the distance and direction from said source point to said second point.
  12. 12. The apparatus of claim 1, wherein said magnetic field generator is at the earth's surface and said second detector at said second point is located in a borehole.
  13. 13. The apparatus of claim 1 wherein said second sensor is movable in a borehole to permit surveying of said borehole.
  14. 14. A method of relative direction measurement, comprising:
    generating a rotating magnetic field having a first axis and having a source point;

    determining the orientation in space of said first axis;
    measuring x,y and z vector components of said rotating magnetic field at a second point remote from said first point;
    obtaining a derived direction from said measured x, y and z vector components of said second point; and determining the direction of said first axis relative to said derived direction.
  15. 15. The method of claim 14, further including locating said source and said second points at spaced locations along a borehole, whereby determining the direction of said first axis relative to said derived direction measures the curvature of said borehole between said points.
  16. 16. The method of claim 14, further including:
    locating said source point on a rotary drill portion of a drill assembly in a borehole; and locating said second point on said drill assembly at a location spaced from said source point.
  17. 17. The method of claim 16, further including correcting said measured x, y, and z vector components for variances of said first axis from the axis of said drill assembly.
  18. 18. The method of claim 14, wherein obtaining a derived direction comprises obtaining a characteristic direction associated with said rotating magnetic field.
  19. 19. The method of claim 14, wherein generating a rotating magnetic field comprises mounting a permanent magnet on a rotary portion of a drill assembly.
  20. 20. The method of claim 14, further including locating at feast one of said source and said second points in a borehole.
  21. 21. The method of claim 14, further including locating said source and said second points in different spaced-apart boreholes.
  22. 22. The method of claim 21, further including determining from the relative directions of said first and said derived directions, the spaced relationship of said spaced-apart boreholes.
  23. 23. The method of claim 14, wherein obtaining said derived direction includes obtaining the cross product of said measured vector components to derive a characteristic direction associated with said rotating magnetic field.
CA002452120A 2001-11-05 2002-07-10 Relative drill bit direction measurement Expired - Lifetime CA2452120C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US33096301P 2001-11-05 2001-11-05
US60/330,963 2001-11-05
US10/112,860 2002-04-02
US10/112,860 US6736222B2 (en) 2001-11-05 2002-04-02 Relative drill bit direction measurement
PCT/US2002/019808 WO2003040762A1 (en) 2001-11-05 2002-07-10 Relative drill bit direction measurement

Publications (2)

Publication Number Publication Date
CA2452120A1 true CA2452120A1 (en) 2003-05-15
CA2452120C CA2452120C (en) 2010-01-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA002452120A Expired - Lifetime CA2452120C (en) 2001-11-05 2002-07-10 Relative drill bit direction measurement

Country Status (4)

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US (1) US6736222B2 (en)
EP (1) EP1442320B1 (en)
CA (1) CA2452120C (en)
WO (1) WO2003040762A1 (en)

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Also Published As

Publication number Publication date
CA2452120C (en) 2010-01-19
EP1442320B1 (en) 2014-04-23
US20030085059A1 (en) 2003-05-08
EP1442320A1 (en) 2004-08-04
US6736222B2 (en) 2004-05-18
WO2003040762A1 (en) 2003-05-15
EP1442320A4 (en) 2006-10-25

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