西南石油大学学报（自然科学版）2017，Vol.39Issue(2)：145-152,8.DOI:10.11885/j.issn.1674-5086.2015.12.19.35
复合钻头钻进过程的有限元模拟
Finite Element Simulation of Drilling Processes Using Hybrid Bits
摘要
Abstract
This paper discloses a novel design of a roller cone and a polycrystalline diamond compact (PDC) hybrid drill bit constructed with two roller cones plus two blades.The design includes two types of constructions:cone-leading(CL) and blade-leading(BL) types.The physical processes for drilling tuff and granite using two differently constructed hybrid bits are numerically simulated using an explicit dynamic finite element analysis method.The experimental results demonstrate that the CL-type drill bit proves suitable for drilling hard formations,whereas the BL type can be used for soft earth formations.The axial forces exerted on the roller cone cutting teeth of the two bit types when drilling hard rocks remain larger than those in the case of drilling soft rocks.Furthermore,the CL-type bit exhibits larger imposed axial forces than the BL type when drilling the same rocks.The distribution pattern of the axial loads imposed on the PDC cutters along the radial direction of the bit is very similar to the shape of the blade crown segment,where the maximum axial load occurs at the conic crest.Moreover,the allocation of the weight-on-bit (WOB) on the roller cones and blades is related to the types of bit constructions.The above conclusion deepens the understanding of drilling processes using hybrid bits,which provides useful guidance for the design and on-site selection of drill bits.关键词
复合钻头/钻进过程/LS-DYNA/有限元模拟/牙齿载荷Key words
hybrid drill bit/drilling process/LS-DYNA/finite element simulation/tooth load分类
能源科技引用本文复制引用
邓嵘,安美,唐东..复合钻头钻进过程的有限元模拟[J].西南石油大学学报（自然科学版）,2017,39(2):145-152,8.基金项目
国家自然科学基金(51374176) （51374176）
四川省科技支撑计划(2013GZX0159) （2013GZX0159）
