Walk (Of Hole) : The tendency of a wellbore to deviate in the horizontal plane; generally thought to be caused by the bit rotating preferentially into the side of the hole and the anisotropic nature of the formation. (Bul D20)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}