With the increasing depth of offshore cementing operations,a low density(1.50 g/cm3)cement slurry system or even lower density was required to prevent formation leakage during fully sealed cementing operations in medium and deep wells.During the research and development process,a high-temperature and low-density reinforcing material BT10K was formed.Without changing the material ratio,the free conversion of cement slurry density from 1.40 g/cm3 to 1.50 g/cm3 could be achieved simply by adjusting the ratio of cement and BT10K.The on-site operation of this system was simple,and it's density could be adjusted,and it's suitable temperature range was 90-150 ℃.The cement slurry had good slurry properties.
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