Today directional wells are of large interest to the petroleum industry because they supply an attractive means for developing both production rate and recovery performance. The great evolution in drilling technology makes it possible to drill horizontal wells with complex paths and extended for interest depths. The main goals in a successful drilling operation are to create economic and safe efficient wells, But the success depends on the goal hitting. The drilling operation described by very high standards of implementation that’s mean the good drilling operation depends on a good well plan. Well trajectory schedule is consisting of many components but finally comes down to distinguish the most optimum well trajectory.