A multi-purpose low-temperature and low-density cement slurry system was constructed by G grade oil well cement as the matrix,and artificial glass microspheres and volcanic ash active cementitious materials as low density materials,and other functional ad-ditives.The system was based on solid-phase suspension as the basic model,and dense packing technology as the basic theory.The volume fraction of solid-phase in cement slurry was increased by optimizing particle grade.The using of low density materials could reduce the free water between solid particles,and lower the water cement ratio,and increase the compactness and reduce permeability of the cement stone,and promote the early strength development of cement stone.The on-site application results showed that the density of ce-ment slurry can be converted from 1.4 g/cm3 to 1.5 g/cm3 without changing the material type of the cement slurry system,and it could achieve dual liquid operation for both freshwater based and seawater based cement slurry system.This cement slurry system had a suitable temperature range of 30～80℃,and good slurry fluidity,and controllable API fluid loss,and zero free water,and high early strength,and adjustable thickening time.
关键词
多用途/低温低密/双液体作业/颗粒级配
Key words
multi-purpose/low-temperature and low-density/dual liquid operation/parti-cle grade
维普
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