The subject of this research is to evaluate the
performance of the drilling bits used to reach the final depth of the
well in regards to mechanical speed, (alpha) factor, the cost per
meter and to recognize the bit that has the highest performance
.
Obtaining such important info is vital for the successful planning
and running of the potential exploration and appraisal wells in
Saddad area. The efficient planning of the drilling operations results
in decreasing the total drilling time which reflects in turn on the
significant decrease in the total drilling cost.
In this article we studied two types of teeth, spherical and
conical one. We compared the results with a previous study for the
flat tooth. the study of stresses field under these three teeth show
that in the soft rocks we prefer to use conical to
oth because it is
easy to be Implanted in the rock, and this was confirmed by the
values of stresses under the tooth. Either in hard rock and due to
our need for big values of pressure to shatter the rock we prefer to
use spherical tooth because of its property of forming tow cons of
stresses under tooth and therefore can be good in drilling hard
rock..
