has been an important recent innovation in well completion and servicing. Coiled
tubing is a continuous, jointless, high-pressure-rated hollow steel tube or pipe
which is brought to the well site on reels of up to 5,000 metres. It can be used
in place of production tubing, which is made of joined sections of pipe and is
similar to a drill string. Special equipment is used to insert the tubing
through the wellhead into the wellbore. This method is considerably quicker and
more efficient than joining sections of pipe.
has proved useful in applications, such as well stimulation and underbalanced
drilling. It can also be used with downhole motors, driven by mud circulations,
for certain kinds of drilling, such as drilling horizontal wells from existing
vertical wells. On the Hibernia platform off Newfoundland, coiled tubing is used
for a variety of completion and servicing tasks.
Petroleum Communication Foundation. Our Petroleum Challenge: Exploring Canada's Oil and Gas Industry, Sixth Edition. Calgary: Petroleum Communication Foundation, 1999. With permission from the Centre for Energy.