Gansheng Yang

Abstract Deepwater drilling poses a high risk, and uncontrolled blowouts can significantly damage property and the environment. The relief well is considered the ultimate and most effective means for stopping blowouts. To quickly assess the rationality of the relief well trajectory design, 3D models for J-shaped and S-shaped trajectories are constructed using analytic geometry.

1. Introduction Long-distance curved pipe-jacking has significant engineering and economic benefits in tunneling projects crossing densely built-up urban areas, heavily trafficked road sections, and oversized cross-sections [1,2]. However, the traditional pipe-jacking guidance method relies on the visibility conditions of the environment and does not apply to long-distance curved pipe-jacking.