CA2247490A1 - A downhole drift indicator - Google Patents

A downhole drift indicator

Info

Publication number
CA2247490A1
CA2247490A1 CA002247490A CA2247490A CA2247490A1 CA 2247490 A1 CA2247490 A1 CA 2247490A1 CA 002247490 A CA002247490 A CA 002247490A CA 2247490 A CA2247490 A CA 2247490A CA 2247490 A1 CA2247490 A1 CA 2247490A1
Authority
CA
Canada
Prior art keywords
plunger
pendulum
housing
volume
drift indicator
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
CA002247490A
Other languages
French (fr)
Other versions
CA2247490C (en
Inventor
Charles Abernethy Anderson
Alan Martyn Eddison
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.)
Andergauge Ltd
Original Assignee
Andergauge Limited
Charles Abernethy Anderson
Alan Martyn Eddison
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 GBGB9604279.1A external-priority patent/GB9604279D0/en
Application filed by Andergauge Limited, Charles Abernethy Anderson, Alan Martyn Eddison filed Critical Andergauge Limited
Publication of CA2247490A1 publication Critical patent/CA2247490A1/en
Application granted granted Critical
Publication of CA2247490C publication Critical patent/CA2247490C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/12—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10
    • G01C9/14—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10 movable in more than one direction
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
    • E21B47/0236—Determining slope or direction of the borehole, e.g. using geomagnetism using a pendulum

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Earth Drilling (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A mounting arrangement for a pendulum in a downhole drift indicator comprises a plunger (26) and a pendulum (46) defining respective normally spaced apart first and second surfaces, and a pivot connection (54) between the plunger and pendulum including a connecting pivot member (56). On the pivot connection being subject to a predetermined load the first and second surfaces engage to limit the load experienced by the pivot member. Also disclosed is a drift indicator biassing arrangement, the arrangement including a housing (40) partially defining a volume (38) for containing a fluid reservoir, a signalling plunger (26) and floating piston (42) defining respective wall portions of the volume and being moveable relative to the housing. A spring (88, 89) acts on the piston to compress the fluid in the volume and move the signalling plunger relative to the housing.
CA002247490A 1996-02-29 1997-02-27 A downhole drift indicator Expired - Lifetime CA2247490C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9604279.1 1996-02-29
GBGB9604279.1A GB9604279D0 (en) 1996-02-29 1996-02-29 Downhole tool
PCT/GB1997/000547 WO1997039220A1 (en) 1996-02-29 1997-02-27 Downhole tool

Publications (2)

Publication Number Publication Date
CA2247490A1 true CA2247490A1 (en) 1997-10-23
CA2247490C CA2247490C (en) 2006-06-20

Family

ID=37393153

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002247490A Expired - Lifetime CA2247490C (en) 1996-02-29 1997-02-27 A downhole drift indicator

Country Status (1)

Country Link
CA (1) CA2247490C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780713A (en) * 2020-06-06 2020-10-16 河南交院工程技术有限公司 Bridge and inclination angle detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780713A (en) * 2020-06-06 2020-10-16 河南交院工程技术有限公司 Bridge and inclination angle detection device

Also Published As

Publication number Publication date
CA2247490C (en) 2006-06-20

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20170227