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ins.: 2014-07-16 00:00; ( Age: 10 yrs )
By: Scientists
Category: COSC1

COSC: 2014-07-16

Two days since the last post and one round trip ...
Nolwenn Portier and Daniel Sopher sample the drill core (specially taken in a plastic liner) with a circular saw.

Two days since the last post and one round trip later. A core barrel was stuck and the only way to get it to the surface was to pull the drill pipe out of the drill hole. Later it was discovered that the bolt that joins the locking-mechanism to the core barrel was broken and, thus, the overshot couldn't grip it.Another discovery during the unwanted round trip was the shape of the drill pipe. Our new -high quality- Canadian NRQ V-Wall drill pipes went from -nearly straight- to the shape of cooked spaghetti (almost) after only 27 m of drilling - with the result of high friction and rotational speeds that are (very) far below the desired value for the drill bit. Despite these problems we still get very good core: good drillers can, apparently, drill with everything. Cheers for them! Depth of the drill hole at midnight: 1662 m. During the evening we did another test core run with plastic liner - this time to test the possibility to attach a plastic bag with tracer at the opening of the core barrel. Here the intention is that the core punctures the bag and that the tracer is swept around the drill core while it enters the core barrel. The results are very promising, and now everything for -sharp- microbiology sampling is set.