Abstract: Platform Lao 168 is the key construction project of Shengli oilfield consisting of 58 wells. This construction basically has the following difficulties:well pattern denseness, anti-collision severity, shallow kick off point, long displacement and holding angle section, environmental protection problems, and few references. Therefore drilling difficulties in the construction is great. By optimizing location layout and wellbore trajectory design, large wellbore unconsolidated formation directional technology, high-precision trajectory controlling technology, extended reach well safety drilling technology and high quality pollution-free seawater drilling fluid technology, the platform Lao 168 finally realized drilling and completion operation integration, saved cast and improved efficiency, and provided precious experience for the future development and construction of cluster wells in Shengli oilfield.