GB2000281A - Measuring depth in boreholes - Google Patents

Measuring depth in boreholes

Info

Publication number
GB2000281A
GB2000281A GB7826267A GB7826267A GB2000281A GB 2000281 A GB2000281 A GB 2000281A GB 7826267 A GB7826267 A GB 7826267A GB 7826267 A GB7826267 A GB 7826267A GB 2000281 A GB2000281 A GB 2000281A
Authority
GB
United Kingdom
Prior art keywords
marker
feature
line
stratum
depth
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.)
Withdrawn
Application number
GB7826267A
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.)
ConocoPhillips Co
Original Assignee
Continental Oil Co
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
Application filed by Continental Oil Co filed Critical Continental Oil Co
Publication of GB2000281A publication Critical patent/GB2000281A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E21B47/04—Measuring depth or liquid level
    • 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
    • E21B47/001—Survey of boreholes or wells for underwater installation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/18—Measuring arrangements characterised by the use of mechanical techniques for measuring depth

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A method of determining the depth of a rock stratum or other feature in a borehole comprises mounting a marker at a fixed position at or above the top of the borehole, suspending on a line an instrument sensitive to the marker and the feature, lowering the instrument past the marker and the feature and measuring the length of line supplied. Referring to the drawing, in the preferred embodiment a radioactive marker 12, such as a source of gamma rays, is positioned near the top of the riser 7 of a sub-sea wellhead structure. A radiation detector 9 is lowered between the marker 12 and a radioactive stratum 11 and the length of line 10 supplied is measured on the floating platform 3. This enables the depth of the stratum 11 to be measured irrespective of tidal variations of the height of the platform 3. <IMAGE>
GB7826267A 1977-03-04 1978-06-02 Measuring depth in boreholes Withdrawn GB2000281A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB928577 1977-03-04

Publications (1)

Publication Number Publication Date
GB2000281A true GB2000281A (en) 1979-01-04

Family

ID=9869046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7826267A Withdrawn GB2000281A (en) 1977-03-04 1978-06-02 Measuring depth in boreholes

Country Status (1)

Country Link
GB (1) GB2000281A (en)

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)