?244.5 mm casing cementing technology on Well Chuzi-1 in salt-cavern gas storage

Well Chuzi-1 is the first appraisal well for salt-cavern gas storage construction in Chuzhou Block, which the production casing depth was over 1 800 m. In line with the problems like lack of data, complex formation conditions which is prone to fluid loss and irregular well diameter which needs whole-well cementing, measures were taken such as using quality brine pad fluid, optimizing low-temperature anti-salt cement slurry system, and string assembly design and installation of centralizers, which ensured successful completion of ?244.5 mm casing cementing. The amplitude log shows that the whole-well cemented section was qualified, which provides useful practice experiences for this block and references for domestic salt-cavern gas storage development into deep formations.