Deep and ultra-deep oil and gas exploration and development are key strategic areas in China's energy sector

with ultra-deep directional drilling serving as a crucial technology for accessing these resources. However

the challenges of drilling and completing ultra-depe directional wells are substantial due to complex topography

diverse formation lithologies

varying pressure systems

reservoir fluid characteristics

and the engineering mechanics of deep formations. To address these challenges and enhance the safe and efficient development of deep oil and gas resources in China

this paper introduces the concept of a geology-drilling engineering-mechanics coupling mechanism for ultra-deep directional wells. The paper systematically reviews the progress and identifies existing problems in the geology-drilling engineering-mechanics coupling mechanism of ultra-deep oil and gas drilling. It also proposes directions for future research and development. It is emphasized that research on the coupling mechanism in China is still in its early stages and requires further integration of geology

mechanics

and engineering disciplines to develop efficient drilling technologies suitable for ultra-deep directional wells.