A New Optimization Model for 3d Well Design E. M. E. M. Shokir, M. K. Emera, S. M. Eid and A. W. Wally Oil & Gas Science and Technology - Rev. IFP, 59 3 (2004) 255-266 Published online: 01 December 2006 DOI: 10.2516/ogst:2004018