Design, Manufacture, and Operation of a Core Barrel for the Iceland Deep Drilling Project (IDDP)
The science program of the Iceland Deep Drilling Project (IDDP) requires as much core as possible in the transition zone to supercritical and inside the supercritical zone (>374°C), in the depth interval 2400–4500 m. The spot coring system selected has a 7 1/4" (184.15 mm) OD at 10 m length...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2010-09-01
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| Series: | Scientific Drilling |
| Online Access: | http://www.sci-dril.net/10/40/2010/sd-10-40-2010.pdf |
| Summary: | The science program of the Iceland Deep Drilling Project
(IDDP) requires as much core as possible in the transition
zone to supercritical and inside the supercritical zone
(>374°C), in the depth interval 2400–4500 m. The spot coring
system selected has a 7 1/4" (184.15 mm) OD at 10 m length
and collects a 4" (101.6 mm) diameter core using an
8 1/2" (215.9 mm) OD core bit. It incorporates design characteristics,
materials, clearances and bearings compatible
with operation of the core barrel at temperatures as high as
600°C. Special attention was given to the volume of flushing
which could be applied to the core barrel and through the bit
while running in and out of the borehole and while coring.
In November 2008 a successful spot coring test using the
new core barrel was performed at 2800 m depth in the production
well RN-17 B at Reykjanes, Iceland, where the formation
temperature is 322°C. A 9.3-m hydrothermally altered
hyaloclastite breccia was cored with 100% core recovery, in
spite of it being highly fractured. A core tube data logger
was also designed and placed inside the inner barrel to monitor
the effectiveness of cooling. The temperature could be
maintained at 100°C while coring, but it reached 170°C for a
very short period while tripping in. The effective cooling is
attributed to the high flush design and a top drive being
employed, which allows circulation while tripping in or out,
except for the very short time when a new drill pipe connection
is being made.
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doi:<a href="http://dx.doi.org/10.2204/iodp.sd.10.05.2010" target="_blank">10.2204/iodp.sd.10.05.2010</a> |
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| ISSN: | 1816-8957 1816-3459 |