牙轮钻头牙齿滑移量规律的仿真研究

通过计算机编程与仿真得出钻头主要结构参数的改变对井底牙轮钻头牙齿运动轨迹和滑移量的影响,并作定量对比分析。根据牙轮钻头几何学、运动学基本方程建立牙轮钻头几何学、运动学仿真模型,编写牙轮钻头牙齿运动轨迹程序。研究结果表明,当其它参数不变时,牙齿井底滑移量随轮底中心臂长C的增大而增大,随钻头外径D的增大而减小,移轴距S对牙齿滑移量的影响不明显;运用井底牙齿轨迹仿真方法能方便地得到井底牙齿滑移量的定量值,避免了通过速度计算得出牙齿滑移量的大量繁琐计算,也大大改善了牙齿滑移量对比分析的不直观性。

Research on the simulation of the tooth slippage of the cone bit

Using computer programming and simulation,the effect of the change of various factors (i.e. main structural parameters of the bit) on the tooth movement track and slippage at the well bottom was derived and a quantitative contrastive analysis was conducted. According to the basic equations of the cone bit geometry and kinematics,the simulation model of the cone bit geometry and kinematics was established and the program of the cone bit tooth movement track was compiled. The results show that,with other parameters unchanged,the tooth slippage at the well bottom goes up with the increase of the arm length of the cone-bottom center (C),and drops with the decrease of the external diameter (D) of the drill bit. The cone bit offset (S) does not affect the tooth slippage noticeably. Using the simulation method of well-bottom tooth motion track,the quantitative value of the well-bottom tooth slippage can be obtained conveniently,thus avoiding large amounts of redundant calculations in obtaining tooth slippage by velocity calculation and greatly improving the straightforwardness of contrastive analysis of tooth slippage.