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directional wells. To drill a typical directional well, the crew members drill the first
part of the hole vertically.

15 Fill in the particle ‘to’ where necessary.

As mentioned earlier, one vital job drilling fluid should … do is … keep
formation fluids from entering the wellbore. Obviously, drilling crews take a great
deal of care not … allow blowouts, and, in fact, not many occur. Unfortunately, the
impression may … linger that blowouts are not the rarity they actually are. In reality,
thousands of wells are drilled every year and very few of them blow out. … resume
drilling, crew members have to circulate the kick out and circulate in mud of the
proper weight. … facilitate circulating a kick, crew members install a series of valves
called the "choke manifold". … circulate a kick out of the well and pump heavy mud
in, the person operating the choke fully opens it, the driller starts the mud pump, and,
as the kick fluids start moving up the hole, the choke operator reduces the choke
opening … hold just enough back-pressure on the well … allow the mud and kick out
but prevent farther entry of formation fluid.

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