Horizontal drilling is a special form of directional drilling. It involves drilling a well through a formation at well inclination of 90° from vertical. The long laterals of the well increase reservoir–well contact, thereby improving reservoir productivity. It is usually applied to thin formation with good vertical permeability or formations with high ratio of vertical to horizontal permeability. Horizontal well trajectory begins with a VS, then a build section that starts from an angle of 0° from the vertical and continues to build gradually until 90°, and then a horizontal or lateral section that penetrates the formation of interest (Fig. 3.8). Sometimes, the horizontal well can have a straight section between two build sections (Fig. 3.9). The BUR of horizontal well can vary depending on the objectives of the well. Hence, horizontal wells have been classified based on the radius of built as short radius, medium radius, long radius, and ultralong radius

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