摘要
DP6 well is a long horizontal well in Daniudi gas field, its designed kickoff point was at 2 510.00 m depth, drilling with average building up rate of 4.85°/30 m to target A in φ311.15 mm borehole, and penetrating the target strata at 3 033.05 m depth with increasing angle to underlie coal seam. This paper analyzed sidetracking technology, selection of sidetracking point, trajectory adjusting for sidetracking, difficulties in large hole deviation sidetrack drilling and the relative technical measures. The drill assembly and construction of sidetracking were also introduced.