Progress and understanding on geology-drilling engineering-mechanics coupling mechanism of ultra-deep directional wells

Abstract

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.

Keywords

• |geology-drilling engieering-mechanics coupling mechanism|ultra-deep directional well|3d geological modeling|geostress|rock-bit-drill string mechanical coupling