Investigations Of Nanocomposite Cementing Structure And Properties

Nanomaterials known as the "21st century's most promising new materials" have received extensive attention because of their unique physical chemical properties.In the paper,SiO₂ nanomaterials were chosen as the research object from the most popular nanomaterials.Their loading,dispersion manner,and dispersion behavior on the cement overall performance,and cementing mechanism were investigated.Results have shown that loading nanomaterials to the cementing significantly improved its strength and durability.The main achievements are as follows.1.SiO₂ nanoparticle uniform dispersion in oil well cement was made by adding effective dispersant,and at high speed mechanically stirring and ultrasound mixing conditions.2.SiO₂ nanoparticle had a great influence on the cement slurry fluidity,and reduced its setting time,both of which were reduced as SiO₂ nanoparticle content increased.3.The early compressive strength and flexural strength,and the permeability decreased were improved in cement SiO₂ nanoparticle system.At an optimal dosage range of 0.5% to 1.5%,the compressive strength of 3 day was improved by 104% at the most optimal content 1.5%.4.Techniques including SEM apply to detecting the structure of the hardening oil well cement.The main mechanism was proposed that nano-SiO₂ modified oil well cement showed a filling and nucleating effect.5.At 0.5% silica sol load,the overall performance of oil well cement was improved,and its high strength,low permeability and good service behavior were obtained.In different density slurry system,both durability and strength could be improved.SiO₂ particles were well compatible with various additives for different slurry.While,this study provided a support for the practical application of nanomaterials in oil well cement.