Key Technologies for Drilling Design of Well Take-1

The design depth of Well Take1 is 11100 meters, with a predicted bottom hole temperature of 213 ℃ and a predicted formation pressure of 133 MPa. Thirteen sets of stratigraphic systems are developed from top to bottom, and the target layer is predicted to contain H₂S. The drilling operation is facing extremely harsh well conditions of ultra deep, ultra-high temperature, ultra-high pressure, and high sulfur content. By conducting research based on the integration of geological engineering and combining with the actual drilling situation of adjacent wells, the distribution patterns of fractures in igneous rocks, gypsum salt rocks, and carbonate rocks and the engineering risks they bring were determined. The optimized well positions minimize the engineering difficulty as much as possible while achieving geological objectives. On the basis of integrated research on geological engineering and prediction of five pressure profiles, the deep geological and engineering risks were fully considered, and the structure of the five openings and five completion wells was designed. Engineering technical measures were taken to achieve that the upper casing should be as deep as possible. We have carried out the design and verification of ultra deep well casing, considering not only the tensile strength of the casing and the bearing capacity of the drilling rig, but also simulated and calculated the force of wellhead tools on the ultra long and overweight casing to avoid plastic deformation of the casing during the running process. The design of drilling tool assembly fully considers hydraulic parameters and vibration effects, achieving safe drilling and speed increase within the optimal drilling parameter range. Research and on-site implementation progress have shown that the key technology in drilling design for Deep Tako 1 well can achieve ten thousand meter drilling.