Offshore oil and gas exploration is advancing to the ultra-deep structure field. For Sinopec, it is very common to encounter the complicated geological characteristics of complex pressure system, ancient sedimentary, HTHP, fluid toxicity and difficulties in engineering mechanics. In terms of drilling engineering, the technical problems exist in design optimization, high construction risk, slow drilling speed and quality control. In well drilling construction, long drilling period, complex circumstances, multiple faults, large investment and even being difficult to reach the target layer for some wells were experienced. Since 2005, based on Sinopec’s ultra-deep exploration and development in northeastern Sichuan Basin and Tarim Basin, through strengthening lab simulation and theoretical analysis, 7 innovation achievements are produced as follows: ①detailed description technology of drilling geological environmental factors with multi information comprehensive inversion;②well structure optimization design based on risk evaluation of drilling engineering;③technology of gas drilling with oversized hole and fluid conversion;④efficient rock breaking tools and the supporting technology;⑤ultra-deep horizontal well trajectory control technology based on conventional guided drilling;⑥ultra-high temperature and ultra-high density drilling fluid technology; ⑦cementing technology of preventing gas channeling with high acid rubber latex for gas field. The field tests and industrial application are carried out on these achievements and the supporting ultra-deep well drilling technologies are formed, which makes China’s ultra-deep well drilling technology step into advanced world level.