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分别用激光粒度仪、ζ电位仪、扫描电镜以及红外扫描动态稳定测试仪分析了四氧化三锰、重晶石、铁矿粉的粒度分布、表面电性、微观形状以及动力稳定性,对这3种加重材料单独加重及复配加重形成的高密度钻井液的性能进行了评价。结果表明:四氧化三锰颗粒小、呈球形、表面活性高、沉降速率小,加重形成的高密度钻井液表现出良好的流变性、沉降稳定性和润滑性;但高温高压滤失量增大,可以通过优选架桥粒子及降滤失剂得到一定程度的控制;与传统加重剂复配,在一定程度上可以弥补传统高密度加重材料的缺陷。综合考虑高密度钻井液性能,四氧化三锰是高密度钻井液理想的加重材料。
The particle size distribution, surface electrical property, microscopic shape and dynamic stability of MnO, barite and iron ore powder were analyzed by laser particle size analyzer, ζpotential analyzer, scanning electron microscope and infrared scanning dynamic stability tester respectively. The performance of high density drilling fluid formed by the aggravating of three kinds of aggravating materials and the compound aggravating were evaluated. The results show that the particles of MnO 4 are small, spherical, with high surface activity and small sedimentation rate. The high density drilling fluid with aggravate formation shows good rheological properties, sedimentation stability and lubricity; however, the filtration loss increases at high temperature and high pressure , Which can be controlled to a certain extent through the preferred bridging particles and the fluid loss control agent. The compounding with the traditional weighting agent can make up for the defects of traditional high-density and heavier materials to a certain extent. Considering the performance of high-density drilling fluid, manganese trioxide is an ideal material for heavy-duty drilling fluids.