I'm MSc Petroleum Engineering Student, doing a Thesis on "Innovative Drilling Technologies used in Directional Drilling (D.D)"...I have downloaded some stuff from SPE .. also some basic books about (DD). I want some more info about (DD)..its implementation, how to used in multilateral wells and also about the DD over different kind of Drillings like underbalance drilling,..and the techniques used to reduce the drilling cost...Please guyz help me out about this info..so that I can make my thesis...Thanking you