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The conference paper deals with the exploration and development of ultra deep reservoirs located at 7,000 m. The combination of BHP pressure (1,000 bar) and high temperature (close to 200 deg C) together with long cementing intervals has driven the development of drilling and cementing innovative technology to positively face these critical HP/HT requirements. The best conditions for primary cementing should be established long before the actual cementing operation. According to the author, advanced cementing products and technology integrated by effective slurry additives are vital items but not unique. In HP/HT severe conditions, great attention must be paid for all the variable influencing factors connected with phase optimization. The paper discusses the optimization of drilling, casing running, and cementing. 4 figs., 6 tabs.