摘要
传统的PDC(polycrystalline diamond compact,聚晶金刚石复合片)钻头磨损预测方法未考虑切削齿温度、切削受力和磨损的动态变化过程,使得磨损预测结果存在偏差,从而导致钻头磨损后受力恶化、快速失效。为解决这一问题,基于磨料磨损理论、微积分基本理论以及迭代算法,构建了PDC钻头切削齿体积磨损量和线磨损量之间的函数关系以及切削齿隐式线磨损模型,提出了PDC钻头动态磨损趋势预测方法,并对某直径为215.9 mm的六刀翼PDC钻头展开磨损趋势预测。结果表明,当PDC钻头未磨损时,其内锥齿的初始受力较大,切削齿齿体温度普遍偏高;随着PDC钻头的不断磨损,其外锥齿的受力呈快速增大趋势,切削齿齿体温度逐渐降低。在破岩初期,PDC钻头冠顶齿的磨损最为严重,外锥齿的磨损速度最快;一段时间后,外锥齿的磨损最为严重。研究结果可为磨损钻头破岩受力特性分析、基于磨损的PDC钻头布齿设计、地热钻头设计以及钻头寿命预测等提供理论基础与支撑。
Traditional PDC(polycrystalline diamond compact)bit wear prediction method does not consider the dynamic change of cutting tooth temperature,cutting force and wear.It makes the wear prediction results deviatie,which leads to the force deterioration and the rapid failure of the bit after wear.To solve this problem,the functional relationship between volume wear and linear wear and the implicit line wear model of PDC bit cutting teeth were constructed,and a prediction method of dynamic wear trend of PDC bit was proposed based on the abrasive wear theory,the calculus fundamental theory and the iterative algorithm.Then,the prediction of wear trend for a six-blade PDC bit with diameter of 215.9 mm was carried out.The results showed that when the PDC bit was not worn,the initial force on the inner cone tooth was large and the temperature of cutting tooth was generally high.With the continuous wear of PDC bit,the force on the outer cone tooth showed a rapid increase trend,and the temperature of cutting tooth gradually decreased.In the initial stage of rock breaking,the wear of crown tooth was the most serious and the wear rate of outer cone tooth increased rapidly;after a period of time,the wear of outer cone tooth was the most serious.The research results can provide the theoretical basis and support for the analysis of rock breaking force characteristics of the worn bit,the wear-based PDC bit layout design,the geothermal bit design and the bit life prediction.
作者
马亚超
张鹏
黄志强
牛世伟
谢豆
邓嵘
MA Ya-chao;ZHANG Peng;HUANG Zhi-qiang;NIU Shi-wei;XIE Dou;DENG Rong(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;Key Laboratory of Oil and Gas Equipment,Ministry of Education,Southwest Petroleum University,Chengdu 610500,China)
出处
《工程设计学报》
CSCD
北大核心
2020年第5期625-635,共11页
Chinese Journal of Engineering Design
基金
国家自然科学基金青年科学基金资助项目(51904263)
国家自然科学基金面上项目(51974272)
四川省科技计划项目(2019YJ0536,18YYJC)。
关键词
变温变载
PDC钻头
动态磨损
线磨损
varying temperature and load
PDC bit
dynamic wear
line wear
