Directional well
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Line (a) is an imaginary line representing the True vertical depth, while line (b) is the borehole itself, and its length is called the measured depth
A directional well is an oil industry term for an oil well with a borehole that deviates from a vertically straight line. This is normally done with the intention of hitting several target sands, for instance.
References
- Directional well, Oilfield Glossary, Schlumberger
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