高效润滑剂室内评价与现场应用

Laboratory Evaluation and Field Application of High Efficiency Lubricant

随着油气田开发的进行,部分储层油气采出后出现地层压力亏空;当新井钻遇该亏空地层时,液柱与地层压差增大,易导致钻具压差卡钻。通过对钻井液润滑机理的研究,室内研发出一种高效润滑剂PF-LUBE168,其润滑性能优异,体系润滑系数小于0.1,与油基钻井液接近。在东海S4井的应用效果显示,在钻井液体系中加入2.5%高效润滑剂PF-LUBE168后,钻具在30.28 MPa的净液柱压差下静止15 min未出现黏卡现象,表明润滑效果良好。该高效润滑剂的成功研发与应用,为后期高难度井的开发提供了有效的技术支撑。

With the development of oil and gas fields,the formation pressure is depleted after production of oil and gas in some reservoirs.When a new well is drilled into the deficient formation,the pressure difference between the liquid column and the formation will increase,which can easily lead to the differential pressure sticking of the drilling tool.By studying the lubrication mechanism of drilling fluid,we developed a high efficiency lubricant PF-LUBE168 in the laboratory.The lubricant PF-LUBE168 has excellent lubrication performance and the lubrication coefficient of the system is less than 0.1,which is close to that of oil-based drilling fluid.The application results of the S4 well in the East China Sea show that,after adding 2.5%PF-LUBE168 into the drilling fluid system,the drilling tool remains stationary for 15 min under a net liquid column pressure difference of 30.28 MPa without any sticking phenomenon,indicating good lubrication effect.The successful development and application of the high efficiency lubricant provides effective technical support for the later development of high difficulty wells.