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This paper presents the application of horizontal drilling in an oilfield of Kurdistan region of Iraq. The most important developments in Petroleum industry were through drilling technology by producing more horizontal wells in the worlds since eighties. Horizontal drilling is considered as a cost-effective method for developing reserves because of continues breakthrough of hardware equipment in oil fields. The technology of Horizontal wells remains to be a remarkable enthusiasm of oil industry since they can give an attractive way to enhancing both production rate and oil recovery factor. The practice of drilling a horizontal oil well in Kurdistan region of Iraq will be highlighted in this paper. In the previous few years horizontal drilling in this region has given an exciting experience for petroleum engineers. A horizontal well will be drilled in the oil fields of Taq Taq and one of the important applications of this well is to recover production rate in thin/tight reservoir and saving in total growth cost. The aim of this paper is to show the structure and parts of horizontal well. Well plan viewpoints incorporate choice of bit and casing sizes, casing setting depths and penetrating mud density, casing, and hydraulics, technique for boring and well profile. An Iraqi oil field (Taq Taq field) is selected for designing horizontal well to increase the productivity and long rich position. Short to Medium radius horizontal well profile is suggested for the developing the field. This paper employs instructions learned and results obtained while applying a rotary drilling of an offset nearby well with liner system on conventional horizontal rig, during the designing and drilling operation arrangement. The main goal of this work is to show the impact of horizontal drilling application on the performance improvement of that oil field. [ABSTRACT FROM AUTHOR]