高品质油田钻探用PDC热残余应力分析与优化设计  

Thermal residual stress and optimum design of PDC for oil drilling

作　　者：徐根[1] 陈枫[2] 徐国平 马春德[2] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083 [2]中南大学现代分析测试中心,长沙410083 [3]金瑞新材料科技股份有限公司,长沙410083

出　　处：《材料科学与工艺》2010年第6期746-751,757,共7页Materials Science and Technology

基　　金：博士点基金资助项目(20070533113)

摘　　要：为解决平界面结构PDC因残余应力而引起的强度问题,在研究PDC热残余应力分布规律的基础上,结合非平面连接技术与梯度过渡技术,设计并研制了新型内置过渡层结构复合片.数值计算结果表明:该复合片聚晶金刚石层(PCD)表面拉应力区明显减弱,其中,轴向最大拉应力为126 MPa,仅为平面界面结构PDC的13.2%,而PCD层上表面的径向拉应力和外侧面的轴向拉应力分别比平界面结构PDC降低了82.5%和94.2%.该复合片磨耗比达到16.43×104,平均抗冲击强度达到472 J,现场钻探实验同样证明了该复合片的优异使用性能.Thermal residual stress value and itg distribution in flat interface polycrystalline diamond compacts （PDC） was analyzed by using finite element analysis （FEA）. On this base, combing with the techniques of non-planar junction and gradient transition, a new PDC combined with non-planar connection and an inner gradient layer between diamond and substrate was presented. The FEA results show that the maximum axial tensile stress in the PCD layer is 126 MPa, which is reduced to 13.2% of that in the conventional planar in- terface PDC. Besides, the maximum radial tensile stress on the surface and axial tensile stress on the side of PCD layer, is reduced by 82.5% and 94.2% comparing to those of planar interface PDC, respectively. Laboratory tests show that the abrasion ratio and shock strength of the new PDC is 16.43 × 10^4 and 472 J, which are of the advanced level in China. The excellent service performance of the new PDC is also proved by the field test.

关 键 词：聚晶金刚石复合片 残余应力 界面结构 功能梯度材料 过渡层 优化设计 

分 类 号：TQ164[化学工程—高温制品工业]