In order to improve the large wellbore temperature difference, narrow density window and other complex problems for the cementing process in the western South China Sea Oilfield, a dynamic cementing model was established by considering the effects of temperature and pressure on cementing fluid density and rheology. The actual flow rate calculation was gained according to the transient acceleration method. The equivalent circulation density of weak points in various wellbore sections and the dynamic well parameters in each stage during the cementing process were calculated based on logging data, wellbore casing program, cementing slurry performance parameters, cementing operation parameters, etc. The technical measures for improving the gas well cementing operation safety and efficiency with narrow density window in deep-water reservoir were proposed, including reasonable design of slurry column structure, displacing with variable displacement, whole simulation process of cementing slurry injection, etc. Field application indicates that the above technical measures can effectively improve the cementing operation with large temperature difference and narrow density window. This research could provide certain guidance for the cementing operation in the western South China Sea Oilfield.
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