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Exercise 3. Fill in the gaps
Fishing, hex, bit, weld-on and threaded, tool joints,
cylindrical, square, groove, internal-external upset, neutral point,
precision instrument
1. When Hughes simplex______1) with a lubricating system
arrived it was necessary to employ an overshot drill collar at least
17 ft long.
2. Below ______(2)the drill string is in compression and
subject to buckling forces.
3. The conventional drill collar has a ______(3) surface.
4. A second variation is spiral______(4) of outer surface,
except near the connections.
5. Both drill pipe and ______(5) are covered in detail by API
specifications, which are followed closely around the world.
6. Drill pipe is furnished internal-upset, external-upset,
______(6).
7. Two methods of attaching tool joints to drill pipe are still
in use: ______(7) connection.
8. The Kelly has become straighter, tougher and made with
closer tolerances – truly a ______(8).
9. If the driller does not control the drill stem at all times an
easy ______(9) job becomes extremely difficult, and a difficult
one becomes almost impossible.
10. Although the ______(10) kelly is still in wider usage, the
______(11) has several distinctive advantages.

Exercise 4. Find Ukrainian and English equivalents to
the following words and study them
weld-on бурильний замок
sub квадратна штанга
hexagonal kelly канавка
rotary bit зварний
pin плашка
slip перехідник

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