钻井液用微粉化表面改性重晶石实验研究

Experimental study on micronized and surface modified barite for drilling fluid

采用球磨机对重晶石粉进行表面改性,通过机械力化学法研制了微粉化表面改性重晶石。采用扫描电镜、红外光谱、X射线衍射等方法,对改性产物进行结构表征。实验评价了微粉化表面改性重晶石对高温高密度钻井液性能的影响。结果表明,微粉化表面改性重晶石的抗温性良好,可达260℃,可显著改善钻井液流变性能,降黏效率为45%,并且微粉化表面改性重晶石在改善加重钻井液流变性的同时,可以兼顾优化滤失性与沉降稳定性。另外,微粉化表面改性重晶石与普通重晶石进行复配使用,也可在一定程度上改善高密度钻井液的综合性能。

Barite was modified by ball mill,and micro powdered surface modified barite was developed by mechanochemical method.The structure of the product was characterized by scanning electron microscope,infrared spectroscopy and X-ray diffraction.The effect of micronized surface modified barite on high temperature and high density drilling fluid was evaluated.The results show that the micro powdered surface modified barite has good temperature resistance,up to 260℃,which can significantly improve the rheological properties of drilling fluid,and the viscosity reduction efficiency is 45%.The micro powdered surface modified barite can improve the fluidity of weighted drilling fluid and optimize the filtration and settling stability at the same time.At the same time,the experimental results show that the combination of micronized surface modified barite and ordinary barite can also improve the comprehensive performance of high-density drilling fluid to a certain extent.