Cementing operation of ultra deepwater well in western South China Sea is notoriously difficult due to low temperature, soft seabed and shallow water flow. Novel ultra deepwater early-enhanced strength additive PC-DA92S and PC-DA93L developed with monomer complex technology and filtrate reducer PC-DG72S developed with suspension polymerization technology have been introduced in order to cope with aforementioned problems. According to the actual conditions in western South China Sea, two sets of suitable cement slurry system have been developed. Properties of cement slurry systems have been analyzed and evaluated. After being applied in Well LSX-1-1 in western South China Sea, it is concluded that these two sets of cement slurry system are characterized by early-enhanced strength, low filtrate, outstanding anti-channeling capability, user-friendly in adjusting thickening time, and stable cement slurry rheological properties at low temperature. Therefore, the outcomes reveal these two sets of low density with early-enhanced strength Class-G Portland cement slurry system can successfully meet the requirements of cementing operation for ultra deepwater region in western South China Sea.
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