钻杆减阻工具减阻效果计算与分析

Effect calculation and analysis of rod drag and torque reducing tools

通过全井钻柱系统动力学模型和计算软件,以某已实施水平井为例,计算了井口至不同井段的动态摩阻扭矩,根据计算结果初步设计了多种减阻工具安放方案,完成了不同安放方案动态摩阻扭矩的计算与分析,通过分析发现动力学计算方法能较好地反应摩阻扭矩的波动情况;具体井况中减阻工具的安放数量存在一个临界值,并非越多越好;安放位置必须经过对比计算确定,合理的安放位置不仅可以有效降低摩阻,而且可以减少安放工具数量。文中的钻柱系统动力学特性分析技术可以为减阻工具选型及安放位置优化提供有力的支撑。

Based on drill string dynamics theory and system simulation software, the horizontal well＇s dynamic drag and torque were studied. According to the calculation result, the paper designed three optional design cases and finished its calculation and analysis. Some valuable reorganizations was gained such as this dynamics method can reflect the fluctuation of drag and torque, the tool number has a marginal value and is not the more the better, and proper location must be obtained through the scientific computation. The drill string dynamics software can provide support for choosing the location of friction reducer.