Slant drilling is a method used in
oil drilling[?] for exploration and extraction of
crude oil, where the direcion of the drill string is forced out of an essential vertical direction. In modern
petroleum engineering, especially in off-shore operations, slant drilling has become the norm rather than the exception, and the path of the drill can be controlled with great precision, and be extended horizontally only limited by the total length of the drill string.
Slant drilling by Kuwait was one of the causes of its invasion by Iraq, and the subsequent Gulf War in 1991.
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