论文部分内容阅读
由于非常规油气资源勘探范围的不断扩大,从而带动油基钻井液的使用范围大大增加。此前国内外开发页岩气及非常规气藏均使用有机土增加体系粘度,悬浮加重材料重晶石,在现场使用的过程中发现,体系流变性能差,起下钻不通畅,容易造成粘卡,低密度固相含量高,比重升高,容易压漏地层导致漏失。室内以新研发出的乳化剂CVR,以此为主剂配制出新型钻井液,室内试验结果显示,该钻井液流变性能好,电稳定性强,破乳电压大于810 V,并且该体系比重可以加重至2.5 g/cm3,可用很好的与柴油、白油、合成基油等基础油搭配使用。现场试验2口井,该体系能满足页岩气藏及其它非常规致密气藏、致密油藏的开发需要。
Due to the continuous expansion of unconventional oil and gas exploration, the use of oil-based drilling fluids has greatly increased. Prior to the development of domestic and international shale gas and unconventional gas reservoirs are using organic soil to increase the viscosity of the system, suspended material heavier barite found in the process of using the site found that the system is poor rheological properties, from drilling unobstructed, easily lead to sticky Card, low-density solid content, high specific gravity, easy to pressure leakage formation lead to leakage. Indoor use of the newly developed emulsifier CVR, as the main agent to prepare a new drilling fluid, indoor test results show that the drilling fluid rheological properties, electrical stability, demulsification voltage greater than 810 V, and the proportion of the system Can be increased to 2.5 g / cm3, can be used well with diesel, white oil, synthetic base oil and other base oils used in conjunction. Field test of 2 wells, the system can meet the development of shale gas reservoirs and other unconventional tight gas reservoirs, tight reservoirs.