The exploration and development of Bohai Oilfield is gradually moving to the deep stratum. However, it is difficult to drill in the deep stratum due to complex pressure system and multi-layer buried hill. This paper analyzes the lithologic characteristics of the deep buried hill strata with complex pressure in Bohai Oilfield. Through the analysis of adjacent well data, seismic data and mud weight window prediction results, it is concluded that the main drilling risks in the surrounding area are leakage and overflow, and the key drilling technologies under the control of complex pressure are introduced, including well structure design, identify method of buried hill interface, drilling fluid maintenance, fine pressure control and other series of technologies. After a series of optimization design and technical application, the efficient drilling of complex pressure multilayer buried hill stratum is finally realized. This paper has a certain reference significance for safe and efficient drilling of deep complex strata in Bohai Oilfield.

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