Slant Hole : A non-vertical hole; usually refers to a wellbore purposely inclined in a specific direction; also used to define a wellbore which is non-vertical at the surface. (Bul D20)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}