h. Drilling is an operation performed by devices with cutting edges or a pointed end for boring
holes, usually by abrasion or repeated blows. Drilling rigs are found on land and offshore.
Offshore rigs are primarily used to extract oil. By drilling the following solids and gases are
extracted:
Natural gas
Salt
Oil
Sulfur
(1)
Typical drillings rigs are shown in Figure 2-27.
Figure 2-27. Typical Drilling Rigs.
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