Abstract
The HTHP (high temperature and high pressure) areas of the Ying-qiong Basin in south China Sea has the characteristics of high temperature, high pressure, many pressure steps and narrow safety density window. The severe geological conditions pose a serious challenge to safe drilling in HTHP environment. Through more than 20 years of technical research and field practice. A set of key drilling technologies suitable for HTHP areas in south China Sea have been formed, including: multi-genesis formation pressure prediction, HTHP drilling fluid system, safe cementing technology, ECD accurate prediction technology, and drilling speed increasing technology. The engineering practice of safe drilling in the HTHP area of the South China Sea improves the efficiency of operation and ensures safe drilling. At the same time, the key technology also provides guidance for offshore drilling in HTHP areas.
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