纳米氧化物颗粒对水基钻井液润滑性能影响的试验研究

Effect of Nano Oxide Particles Addition on Lubricating Properties of Water-based Drilling Fluid

摘要:

通过在水基钻井液中添加纳米氧化物颗粒，来改善其润滑性能。选用了Al2O3、TiO2及SiO2三种纳米氧化物颗粒作为钻井液改性添加剂，利用极压润滑仪及销盘摩擦磨损实验仪研究了添加不同种类和浓度纳米颗粒氧化物对水基钻井液的润滑性能及减摩效果的影响。结果表明，所添加的3种球形纳米颗粒均有润滑减阻减摩的效果，其中SiO2颗粒的钻井液的润滑性能、滤失性能以及减摩效果都是最好的。当纳米SiO2颗粒加量为0.4%时，滤失量最小，润滑系数降低率达到15.6%，摩擦系数降低率为32.0%，磨痕轨迹平滑，减摩效果最为明显。当纳米颗粒浓度超过0.5%时，减摩效果降低，磨盘脱层磨损明显。

关键词:纳米氧化物颗粒;钻井液;润滑性能;销盘摩擦磨损实验

Abstract:

This study has tried to improve lubricating properties of water-based drilling fluid with adding nano oxide particles to it. Alumina (Al2O3), titania (TiO2) and silica (SiO2) nanoparticles were selected as modified drilling fluid additives, the study was made on the effects of adding different kinds and concentrations of oxide nanoparticles on lubricating properties and friction reducing of water-based drilling fluid by using the extreme pressure lubrication device and the pin-on-disk friction and wear tester. The results show that the three kinds of spherical nanoparticles all have the effect of lubrication and antifriction, but the drilling fluid containing SiO2 particles has the best properties of lubrication, filtration and antifriction. When the adding amount of SiO2 nanoparticles was 0.4%, the filtration was minimum, the reduction rates of lubricating and friction coefficients were 15.6% and 32.0% respectively with smooth wear scar, the friction reducing effects was the most evident. When the concentration of the nanoparticles was higher than 0.5%, the friction reducing effect decreased with obvious delamination and wear.

Key words:nano oxide particle; drilling fluid; lubricating property; pin-on-disk friction and wear test