旋转导向钻井工具液压分配系统的设计

THE DESIGN OF WORKING FLUID CONTROL DISTRIBUTION IN ROTARY STEERING DRILLING TOOL

工作液控制分配单元的设计是旋转导向钻井工具导向功能的实现关键和难点之一,该单元的工作特性主要取决于上盘阀高压孔圆心角、上下盘阀摩擦副的结构尺寸和摩擦副的密封性。上盘阀高压孔圆心角的大小,决定工具推靠力的作用形式,直接影响工具的导向能力、使用寿命和密封性,理论分析表明,当3个“巴掌”作用合力的覆盖面角αo=60°时,该圆心角的最优值为θ=180°。由于工具中的扭矩发生器所能提供的驱动力矩有一定限制,为了实现对控制轴的稳定控制,应该尽量减小控制轴上阻力矩之一的上下盘阀摩擦副之间的摩擦阻力矩,该摩擦阻力矩主要受上下盘阀摩擦副结构的影响,给出了上下盘阀的结构及主要尺寸,并定量分析了该摩擦阻力矩。

The design of working fluid control distribution link is one of the key and difficulty point about realizing the orient ed function of rotary steering drilling tool. The unit' s working trait is determined by the central angle of upper plate value high pressure hole, the structure size of upper and lower plate value friction pairs and the sealing property of friction pairs. The function form of thrust with tool is decided by the size of the central angle of upper plate value high pressure hole and directly influence oriented utility,using term and sealing property. The analysis of theory shows that the optimal value of the central angle θ= 180° as the covering angle of three 'palm' composition of function forces is α = 60°. Because of the limitation of drive torque which is provided by torque generator with tool, the friction resistance torque of upper and lower plate value friction pairs should be reduced in order to steadily control the control axis. The friction torque is influenced by the structure of the upper and lower plate value friction pairs. The paper gave the structure of the upper and lower plate value and key size and quantitatively analyzed the friction resistance torque.