GB2000281A - Measuring depth in boreholes - Google Patents
Measuring depth in boreholesInfo
- 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- Withdrawn
Links
- 239000003550 marker Substances 0.000 abstract 5
- 230000002285 radioactive effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
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>
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) |
-
1978
- 1978-06-02 GB GB7826267A patent/GB2000281A/en not_active Withdrawn
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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) |