岩屑床破坏器在水平井斜井段的清洁效果研究

Study on cleaning effect of cuttings bed destroyer in inclined section of horizontal well

针对水平井斜井段岩屑堆积成床易造成钻柱摩阻、扭矩增大及卡钻等问题,对斜井段中岩屑床破坏器的影响规律和清洁效果进行评估分析。首先,基于CFD(computational fluid dynamics,计算流体动力学)技术,对岩屑床破坏器的清洁机理进行研究,并通过对比分析得到岩屑床破坏器的清洁效果。然后,分析了不同井斜角、钻井液排量和钻柱转速下岩屑床破坏器对水平井斜井段岩屑床的影响规律,并对岩屑床破坏器的工况参数进行优选,以更好地发挥其清洁作用。最后,通过岩屑床破坏器的现场应用来验证其清洁效果。结果表明,岩屑床破坏器对水平井斜井段井眼的清洁效果非常明显,使用后可减小钻柱的摩阻和扭矩,有效防止钻进过程中卡钻事故的发生。研究结果可为岩屑床破坏器的使用提供指导。

Aiming at the problem that the accumulation of cuttings in the inclined section of horizontal well is easy to cause the drill string friction,torque increase and stuck drill,it is necessary to evaluate and analyze the influence law and cleaning effect of cuttings bed destroyer in the inclined section.Firstly,the cleaning mechanism of cuttings bed destroyer was studied based on the CFD(computational fluid dynamics)technology,and the cleaning effect of cuttings bed destroyer was obtained through comparative analysis.Then,the influence of cuttings bed destroyer on cuttings bed in the inclined section of horizontal well was analyzed under different well angles,drilling fluid displacements and drill string rotation speeds.The working condition parameters of cuttings bed destroyer were optimized to better play its cleaning effect.Finally,through the application of cuttings bed destroyer in the on-site,its cleaning effect was verified.The results indicated that the cuttings bed destroyer was very effective in cleaning the wellbore of the inclined section of horizontal well,and the friction and torque of the drill string were reduced after it was used,which could effectively prevent the stuck drill accident during the drilling.The research results can provide guidance for the use of cuttings bed destroyer.