High-density salt formation.

   "KS24-6 Well Horn Mouth Cement Extrusion Remediation Work: Sealing the salt formation layer at 196.85+206.38mm after drilling upper plug resulted in overflow, multiple remediation attempts yielded unsatisfactory results. Using the extrusion method to seal the high-pressure saltwater layer at 4393.9m, with a cement slurry density of 2.65g/cm³ and a static temperature of 101°C. Cement slurry preparation was completed smoothly within 3 days, successfully sealing the high-pressure saltwater layer."

   "KS9-2 Well 139.7mm Tailpipe: Cement wellbore with ultra-high density 2.65 g/cm³ cement slurry, well depth of 7366m, sealing section length of 598m, bottom hole temperature of 166°C, circulating temperature of 151°C, annular clearance of 16.1~18.5mm, and 2.55g/cm³ oil-based mud."

   "KS21 Well Salt Layer Tailpipe, Reconnection: The salt layer is buried at its deepest (7492.89-7929m), setting a record for the longest reconnection section in the Tarim Basin. The well has a depth of 7929m, a bottom hole temperature of 169°C, a tailpipe depth of 7925m, a hanger position of 7087m, reconnected to the wellhead, with a narrow downhole safety density window (2.49-2.51g/cm³), and precise pressure control for wellbore integrity."