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This is a component of a drillstring
that provides weight on bit for drilling.
Drill collars are thick-walled tubular
pieces machined from solid bars of
steel, usually plain carbon steel but
nickel-copper alloy or other
nonmagnetic premium alloys.
The bars of steel are drilled from end
to end to provide a passage to
pumping drilling fluids through the
The outsid diameter of the steel bars
may be machined slightly to ensure
roundness, and in some cases may
be machined with helical grooves
Last threaded connections, male on
one end and female on the other, are
cut so multiple collars can be
screwed together along with other
downhole tools to make a bottomhole