全局力平衡PDC钻头布齿优化设计  

Optimal Design for Cutter-layout of Global Force Balanced PDC Bits

作　　者：马亚超[1] 张鹏[1] 黄志强[1] 邓嵘[1] 喻洪梅 MA Yachao;ZHANG Peng;HUANG Zhiqiang;DENG Rong;YU Hongmei(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu,610500)

机构地区：[1]西南石油大学机电工程学院,成都610500

出　　处：《中国机械工程》2020年第20期2412-2419,2428,共9页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51904263,51974272);四川省科技计划资助项目(2018JY0107,2019YJ0536)。

摘　　要：针对聚晶金刚石复合片(PDC)钻头在钻井破岩过程中因受力不平衡,导致钻井倾斜、井径扩大、钻头产生横向振动和涡动,造成钻头早期失效的问题,基于已有PDC钻头切削力学知识,构建了PDC钻头弯曲力矩及全局力平衡布齿优化设计模型,并提出模型求解方法。布齿设计实例结果表明,采用全局力平衡布齿设计方法得到的布齿结构可使PDC钻头在不同进尺条件下均能保持全局力平衡状态,尤其低进尺(小于1 mm)时的力平衡状态得到极大改善,提高了PDC钻头的钻井稳定性,对于改善钻头受力、提升钻头使用寿命、提高钻井质量与效率具有重要意义。For the problems of the well deflection,hole enlargement,bit whirl and vibration,and the bit early failures caused by the unbalanced forces on PDC bits during the drilling processes,the optimal design model of cutter-layout of global force balanced PDC bits and bending moment model were constructed based on the existing PDC bit cutting mechanics,and the corresponding solution method was proposed.Results of a cutter layout design example show that the global force balance cutter layout design method may keep the global force balanced status of PDC bits in different footages.In particular,the force balance state of PDC bit is greatly improved at small footage(<1 mm).The drilling stability of PDC bits is improved.The results are of great significance to amend the forces on drill bits,which may extend the service life of the drill bits and improve the drilling efficiency.

关 键 词：全局力平衡 聚晶金刚石复合片钻头 布齿 克里金模型 

分 类 号：TE921[石油与天然气工程—石油机械设备]