【摘要】 对定向井泥浆用塑料小球固体润滑剂的现场应用效果作了较系统的分析,认为塑料小球的润滑机理是基于两点:一是参与泥饼的形成过程,改变了钻具与泥饼的接触状态,由面接触转变为点接触;二是塑料小球能在钢材表面富集,由滑动摩擦转变为滚动摩擦,从而形成了该润滑剂在防压差卡钻、降低扭矩和提放阻力及减少技术套管和钻具的磨损等多方面的独特效能。对塑料小球的粒径配合、使用量控制及现场使用中的有关问题,都进行了讨论,最后对57口井的使用效果作了具体分析。更多还原

【Abstract】 The application results of plastic beads lubricant in directional drilling are analysed systematically. The dosage of plastic beads lubricant in drilling fluid in directional well should be over 1%. The particle size distribution is the main effect factor to lubricity, and raising the ratio of beads with particle size of 10 to 30 mesh can be improve the lubricity of plastic beads.更多还原