CA2632795A1 - System, apparatus, and method of conducting measurements of a borehole - Google Patents

System, apparatus, and method of conducting measurements of a borehole Download PDF

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Publication number
CA2632795A1
CA2632795A1 CA002632795A CA2632795A CA2632795A1 CA 2632795 A1 CA2632795 A1 CA 2632795A1 CA 002632795 A CA002632795 A CA 002632795A CA 2632795 A CA2632795 A CA 2632795A CA 2632795 A1 CA2632795 A1 CA 2632795A1
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CA
Canada
Prior art keywords
borehole
drilling
assembly
drilling assembly
caliper arm
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
CA002632795A
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French (fr)
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CA2632795C (en
Inventor
Ruben Martinez
Jan Smits
Reza Taherian
Brian Clark
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Schlumberger Canada Ltd
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Schlumberger Canada Ltd
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Publication date
Application filed by Schlumberger Canada Ltd filed Critical Schlumberger Canada Ltd
Publication of CA2632795A1 publication Critical patent/CA2632795A1/en
Application granted granted Critical
Publication of CA2632795C publication Critical patent/CA2632795C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/024—Determining slope or direction of devices in the borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/08—Measuring diameters or related dimensions at the borehole

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • General Physics & Mathematics (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

A method is provided for conducting measurements of a borehole while drilling the borehole in a geological formation. First, a rotatable drilling assembly is provided that has, at a forward end, a drill bit and a borehole measurement tool connected rearward of the drill bit.
The measurement tool includes at least one caliper arm extendible outward from the measurement tool. The method involves drilling the borehole by operating the rotatable drilling assembly. While drilling, the wall of the borehole is contacted with at least one extendable caliper arm of the borehole measurement tool and the extension of the caliper arm contacting the borehole wall is measured, thereby determining a distance between the measurement tool and the borehole wall. During rotation of the drilling assembly, contact is maintained between the caliper arm and the borehole wall and the measuring step is repeated at multiple positions of the drilling assembly.

Claims (50)

What is claimed is:
1. A method of conducting measurements of a borehole while drilling the borehole in a geological formation, said method comprising the steps of:

providing a rotatable drilling assembly having thereon, at a forward end, a drill bit and a borehole measurement tool connected rearward of the drill bit, the measurement tool including at least one caliper ann extendible outward from the measurement tool;

drilling the borehole by operating the rotatable drilling assembly;

while drilling, contacting the wall of the borehole with at least one extendable caliper arm of the borehole measurement tool;

measuring the extension of the caliper arm contacting the borehole wall, thereby determining a distance between the measurement tool and the borehole wall; and repeating the contacting and measuring steps at multiple positions of the drilling assembly during drilling.
2. The method of claim 1, wherein said contacting and measuring steps are performed at a plurality of angular positions of the drilling assembly.
3. The method of claim 2, further comprising the step of detecting the lateral position of the measurement tool in the borehole for each said measurement of the extension of the caliper arms.
4. The method of claim 3, wherein said detecting step includes measuring the lateral accelerations of the drilling assembly during drilling and deriving, from the measurements of lateral acceleration, the lateral positions of the borehole measurement tool.
5. The method of claim 4, wherein said step of measuring lateral accelerations include utilizing a pair of accelerometers mounted in generally perpendicular relation on a plane of the borehole measurement toot that is disposed in generally perpendicular relation to the longitudinal axis of the measurement tool.
6. The method of claim 1, further comprising the step of determining the angular orientation of the drilling assembly relative to the borehole for each said measurement of the extension of the caliper arms.
7. The method of claim 1, wherein said drilling step includes rotating the drilling assembly including the measurement tool, said method further comprising the step of maintaining contact between the caliper arms and the borehole wall during rotation of the drilling assembly.
8. The method of claim 7, wherein said step of maintaining contact includes biasing said caliper arm radially outward throughout said rotation.
9. The method of claim 1, wherein said measuring step includes operating a proximity probe to detect the position of the caliper arm.
10, The method of claim 1, further comprising the step of determining the angular position of the drilling assembly during each measuring step.
11. The method of claim 1, wherein said drilling step includes directing the drilling assembly forward in an angular direction deviating from the longitudinal axis of the borehole.
12. The method of claim 1, wherein said measurement tool includes a plurality of spaced apart caliper arms, said contacting and measurement steps being performed simultaneously with each arm and at different circumferential locations of the borehole wall.
13. The method of claim 12, wherein said plurality of arms are positioned about the periphery of the drilling assembly, such that during the contacting step, the drilling assembly rotates while the caliper arm maintains contact with the borehole wall.
14. The method of claim 1, wherein said caliper arm has a leading edge and a trailing edge for contacting the borehole wall, said drilling step including rotating the drilling assembly in a direction such that the leading edge is forward of the trailing edge along the direction of rotation, and wherein the caliper arm is pivoted proximate the leading edge during the contacting step such that contact with the borehole wall rotatably urges the trailing edge toward the measurement tool.
15. The method of claim 14, wherein said arm is pivotably attached to the drilling assembly proximate the leading edge, said contacting step including urging the trailing edge in engagement with the borehole wall during rotation of the drilling assembly.
16. The method of claim1, wherein said contacting and measuring steps are performed in respect to a series of angular locations of the borehole wall, said method including deriving a circumferential profile of the borehole wall from said measurements at a common axial position in the borehole.
17. The method of claim 16, further comprising telemetrically communicating said measurements to the surface, during drilling.
18. The method of claim 16, further comprising the step of determining the angular orientation of the measurement tool relative to the borehole for each said measurement of the extension of the caliper arms by determining the orientation of the measurement tool relative to the earth's -magnetic field.
19. The method of claim 18, further comprising the step of detecting the lateral position of the measurement tool in the borehole for each said measurement of the extension of the caliper arms by measuring the lateral accelerations of the measurement toot during said contacting and measuring steps and numerically integrating therefrom to determine the lateral positions of the borehole measurement tool.
20. In a rotatable drilling assembly for drilling a borehole penetrating a geological formation, a borehole measurement apparatus comprising:

a support body integrated with the drilling assembly and rotatably movable therewith;

at least one caliper arm affixed to said body and extendable therefrom to contact the borehole wall during drilling; and a sensor positioned proximate said caliper arm and operable to detect the distance between the extended arm and the support body.
21. The apparatus of claim 20, further comprising a plurality of said caliper arms affixed to the periphery of said support body.
22. The apparatus of claim 20, wherein said caliper arm includes a driving element positioned to urge said caliper arm radially outward from said body.
23. The apparatus of claim 22, wherein said driving element includes a spring positioned to urge said caliper arm radially outward to contact the borehole wall.
24. The apparatus of claim 22, wherein said driving element includes a hydraulic actuator positioned to ure said caliper arm radially outward to contact the borehole wall.
25. The apparatus of claim 22, wherein said caliper arm has a leading edge and a trailing edge, said driving element being positioned such that said trailing edge is urged radially outward to contact the borehole wall while the drilling assembly is rotated in a direction wherein the leading edge is forward of the trailing edge along the direction of rotation.
26. The apparatus of claim 25, wherein said caliper arm is pivotally mounted proximate said leading edge.
27. The apparatus of claim 26, wherein said driving element includes a spring positioned to urgingly pivot said caliper arm about an axis proximate said leading edge.
28. The apparatus of claim 20, wherein said sensor includes a proximity probe positioned to detect the relative position of said caliper arm.
29. The apparatus of claim 20, further comprising a protective pad positioned radially outward of said body and adjacent said caliper arm at an axial position forward of said caliper arm, said caliper arm being retractable to a recessed radial position beneath the radial position of said protective pad.
30. The apparatus of claim 29, further comprising a second of said protective pads spaced axially rearward of said caliper arm, said caliper arm being pivotally mounted between said first and second protective pads.
31. The apparatus of claim 20, further comprising a sensing device operatively associated with said support body to detect the angular orientation of said support body relative to the borehole wall.
32. The apparatus of claim 20, further comprising a sensing device operatively associated with said support body to detect the lateral position of the support body relative to the borehole.
33. The apparatus of claim 32, wlierein said sensing device includes a pair of accelerometers positioned in generally perpendicular relation on a plane generally perpendicular to the longitudinal axis of the drilling assembly, said accelerometers being positioned to detect the lateral accelerations of the support body.
34. The apparatus of claim 20, further comprising a pair of magnetometers positioned to detect the orientation of said support body with respect to the earth's magnetic field, said pair of magnetometers being positioned in generally perpendicular relation on a plane generally perpendicular to the longitudinal axis of said support body.
35. A steerable rotary drilling assembly for drilling a borehole penetrating a geological formation, said drilling assembly comprising:

a drill bit positioned on a forward end of the drilling assembly to rotatably engage the formation; and a bias unit positioned rearward of the drill bit and connected therewith for controlling the direction of drilling of the drill bit, said bias unit including, an elongated tool body;

a plurality of movable pads affixed to said tool body, said pads being extendable radially outward of said tool body to maintain contact with the borehole wall during rotation of the drilling assembly; and a sensor positioned proximate each said movable pad to detect the relative position of the pad during extension.
36. The assembly of claim 35, wherein said movable pads include a driving element positioned to urge said pad radially outward from said tool body.
37. The assembly of claim 36, wherein said movable pads include a spring positioned to urge said movable pad radially outward to contact the borehole wall.
38. The assembly of claim 36, wherein said movable pads have a leading edge and a trailing edge, said driving element being positioned such that said trailing edge is urged radially outward to contact the borehole wall.
39. The assembly of claim 38, wherein said movable pads are pivotally supported proximate said leading edge.
40. The assembly of claim 39, wherein said driving element includes a spring positioned to urgingly pivot said movable pad about an axis proximate said leading edge.
41. The assembly of claim 40, wherein said drilling assembly is rotatable in a direction wherein said leading edge is forward of said trailing edge.
42. The assembly of claim 36, wherein said sensor includes a proximity probe positioned to detect the position of said movable pad.
43. The assembly of claim 42, further comprising telemetry means for communicating measurement data from the borehole to the surface.
44. The assembly of claim 35, further comprising a protective pad extending radially outward of said tool body and adjacent said movable pad at a longitudinal position forward of said movable pad, said movable pad being retractable to a recessed radial position beneath the radial position of said protective pad.
45. The assembly of claim 44, further comprising a second protective pad spaced longitudinally rearward of said movable pad, said movable pad being pivotally fixed between said first and second protective pads.
446. The assembly of claim 35, further comprising a sensing device associated with said tool body to detect the angular orientation of the tool body in the borehole wall.
47. The assembly of claim 46, further comprising a pair of magnetometers positioned to detect the orientation of said tool body with respect to the earth's magnetic field, said pair of magnetometers being positioned in generally perpendicular relation on a plane generally perpendicular to the longitudinal axis of said tool body.
48. The assembly of claim 35, further comprising a sensing device operatively associated with said tool body to detect the lateral position of said tool body relative to the borehole.
49. The assembly of claim 48, wherein said sensing device includes a pair of accelerometers positioned in generally perpendicular relation on a plane generally perpendicular to die longitudinal axis of the drilling assembly, said accelerometers being positioned to detect the lateral accelerations of said tool body.
50. The assembly of claim 49, further comprising a pair of magnetometers positioned to detect the orientation of said tool body with respect to the earth's magnetic field, said pair of magnetometers being positioned in generally perpendicular relation on a plane generally perpendicular to the longitudinal axis of said tool body.
CA2632795A 2004-12-01 2005-11-24 System, apparatus, and method of conducting measurements of a borehole Expired - Fee Related CA2632795C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US63256404P 2004-12-01 2004-12-01
US60/632,564 2004-12-01
US11/018,340 US7669668B2 (en) 2004-12-01 2004-12-20 System, apparatus, and method of conducting measurements of a borehole
US11/018,340 2004-12-20
CA 2527605 CA2527605C (en) 2004-12-01 2005-11-24 System, apparatus, and method of conducting measurements of a borehole

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CA 2527605 Division CA2527605C (en) 2004-12-01 2005-11-24 System, apparatus, and method of conducting measurements of a borehole

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CA2632795A1 true CA2632795A1 (en) 2006-06-01
CA2632795C CA2632795C (en) 2011-06-28

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CA (2) CA2527605C (en)
DE (1) DE102005057049A1 (en)
GB (1) GB2420802B (en)

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Also Published As

Publication number Publication date
CA2632795C (en) 2011-06-28
CA2527605A1 (en) 2006-06-01
US7669668B2 (en) 2010-03-02
US20060113111A1 (en) 2006-06-01
DE102005057049A1 (en) 2006-06-08
GB2420802B (en) 2007-04-04
US8978782B2 (en) 2015-03-17
US20100108386A1 (en) 2010-05-06
GB0523884D0 (en) 2006-01-04
GB2420802A (en) 2006-06-07
CA2527605C (en) 2008-09-16

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