摘要
在油气钻井、深部地层钻探中,聚晶金刚石钻头有着广泛的应用。聚晶金刚石复合片(PDC)由聚晶金刚石层与硬质合金基体所组成。由于聚晶金刚石层与硬质合金基体的热膨胀系数等性质差异,PDC在烧结冷却后内部会存在巨大的残余应力。为降低PDC内部的残余应力,本文提出了一种梯度结构金刚石复合片的制备技术。通过以熔融沉积成型加烧结的工艺方法,确定了梯度结构金刚石复合片的制备技术路线;对制备出的梯度结构金刚石复合片的微观形貌及残余应力的分布情况特征等进行分析;进行室内钻进试验验证了梯度结构金刚石复合片的钻进性能。结果表明,熔丝制造工艺制备的梯度结构金刚石复合片在聚晶金刚石层和梯度层界面处存在1.4 GPa的压应力,显著提高了层间结合能力,相比常规复合片钻进效率提升约36%且使用寿命更长。
Polycrystalline diamond bits have the widest application in oil and gas drilling and deep formation drilling.Polycrystalline diamond compact(PDC)consists of a polycrystalline diamond layer and a cemented carbide substrate.Due to the difference in the coefficient of thermal expansion between the polycrystalline diamond layer and the tungsten carbide matrix,there is a huge residual stress inside the PDC after sintering and cooling.To solve the problem of reducing the residual stresses inside the PDC,this paper reports a preparation technology for gradient structure diamond compact.Through the process of fused deposition modelling and sintering(FDMS),the technical route for the preparation of gradient structure diamond compact was determined;the micro‑morphological features of the prepared gradient structure diamond compact and the distribution of the residual stresses were analysed;and the indoor drilling tests were carried out to verify the drilling performance of the gradient structure diamond compact.The results show that the gradient structure diamond compact prepared by the FDMS has a compressive stress of 1.4GPa at the interface between the polycrystalline diamond layer and the gradient layer,which significantly improves the interlayer bonding ability and effectively reduces the internal residual stress,and improves the drilling efficiency by about 36%and the service life is longer compared with that of the conventional compact.
作者
邵众望
张绍和
荣令龙
孔祥旺
李俞露
SHAO Zhongwang;ZHANG Shaohe;RONG Linglong;KONG Xiangwang;LI Yulu(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha Hunan 410083,China;School of Geosciences and Info‑Physics,Central South University,Changsha Hunan 410083,China)
出处
《钻探工程》
2024年第4期38-45,共8页
Drilling Engineering
基金
国家自然科学基金面上项目“钻进坚硬岩层的梯度结构PDC应力调控机制与3D打印制备技术研究”(编号:42372358)
国家重点研发计划项目“金刚石超硬复合材料制品增材制造技术与应用研究”(编号:2021YFB3701800)
湖南省自然科学基金面上项目“基于岩石压入-刻划强度定量表征的钻头参数设计智能化研究”(编号:2022JJ30709)。
作者简介
第一作者:邵众望,男,汉族,2001年生,在读硕士研究生,地质资源与地质工程专业,主要从事3D打印金刚石工具方面的研究工作,湖南省长沙市岳麓区中南大学北校区,18404970690@163.com;通信作者:张绍和,男,汉族,1967年生,教授,博士生导师,探矿工程专业,博士,长期从事金刚石工具和地质工程的研究和教学工作,湖南省长沙市岳麓区中南大学北校区,zhangshaohe@163.com;通信作者:荣令龙,男,汉族,2000年生,博士研究生,地质资源与地质工程专业,主要从事3D打印金刚石工具方面的研究工作,湖南省长沙市岳麓区中南大学北校区,ronglinglong0922@163.com。
