Physics
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006p%26ss...54..345z&link_type=abstract
Planetary and Space Science, Volume 54, Issue 4, p. 345-356.
Physics
5
Scientific paper
The effect of the environmental conditions on Mars—low temperature, low pressure, the uncertainty in the nature of the formations to be penetrated and the possibility of encountering ice —imply that a successful drilling system will have to be able to cope with a wide range of conditions. Systems using continuous drill pipe or wireline both offer attractive features and disadvantages, and the preferred choice may depend on the target depth. The drill bit will have to cope with a range of terrain, and we offer some suggestions for making a bit that will be able to drill in both hard and soft formations, and also be able to resist choking if it encounters ice or ice-bound materials. Since it will not be possible to use a liquid to remove the drilled cuttings on Mars, the cuttings removal system will probably use some form of auger, although it may be possible to use continuous or intermittent gas blasts. The sublimation of ice resulting from the heat of drilling in ice-containing formations may help in removing the cuttings, particularly as they are expected to be very fine as a result of the low power available for drilling. Drilling into ice bound soils was also found to be akin to drilling into ice-bound sandstones.
Cooper George
Zacny Kris
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