MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Offshore oil drilling. Computer illustration showing two offshore drilling platforms (oil rigs) using two different methods of extracting oil from beneath the sea floor: horizontal drilling (left) and vertical drilling (right). Traditionally most oil wells were vertical. However, modern directional drilling technologies allow for deviated wells, which given enough depth can become horizontal. This is beneficial as the reservoir rocks that contain the oil (or gas) are usually themselves horizontal.
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