工程设计学报2025，Vol.32Issue(1)：23-31,9.DOI:10.3785/j.issn.1006-754X.2025.02.116
基于岩屑形貌分形特征的PDC齿破岩比功评估模型
Evaluation model of rock-breaking specific energy for PDC cutter based on fractal characteristics of rock cutting morphology
摘要
Abstract
As the exploration center of oil and gas resources in China moves towards deep and ultra-deep layers,the difficulty of oil and gas exploration has been increasing,which can be recognized poor drilling capacity and low rate of penetration resulted from high strength and strong abrasion of deep hard formation rocks.In order to improve the rock-breaking performance of deep hard rock bits,conical cutters are widely used in the design of hybrid-cutters PDC(polycrystalline diamond compact)bits.However,the rock-breaking volume of conical cutter is small,and its cutter arrangement method needs more comprehensive theoretical support.Therefore,taking the rock-breaking specific energy as the objective function,a rock-breaking specific energy evaluation model for the PDC cutter based on the fractal characteristics of rock cutting morphology was established by quantifying the physical parameters such as cutting force and cutting energy consumption of different types of PDC cutters during the rock-breaking process and using the maximum particle size of rock cuttings and fractal dimension of rock cutting particle size.Meanwhile,the rock-breaking performance of conical PDC cutter was investigated by comparing with the conventional planar PDC cutter,and the effects of cutting depth,cutting angle and cutting speed on the rock-breaking performance were analyzed.The results showed that the conical PDC cutter was suitable for rock breaking with large cutting depth and low energy consumption,while the conventional PDC cutter was suitable for rock breaking with high speed and small cutting depth.The cutting angle of two kinds of PDC cutters was recommended to be about 20°.Conical PDC cutters were suitable for arrangement at the central vertex and crown area of the hybrid-cutters PDC bit,while conventional PDC cutters were suitable for encrypted arrangement from the nose to shoulder area of the bit.The research results can provide theoretical basis for revealing the particle size distribution law of rock cuttings generated by PDC cutter breaking rock and the design of hybrid-cutters PDC bits.关键词
锥形PDC齿/切削破岩/分形维数/岩屑粒径/破岩比功Key words
conical PDC cutter/cutting and breaking rock/fractal dimension/particle size of rock cutting/rock-breaking specific energy分类
石油、天然气工程引用本文复制引用
赫文豪,李欣龙,张润青,刘利,史怀忠,黄中伟,熊超,陈振良,吴洪志..基于岩屑形貌分形特征的PDC齿破岩比功评估模型[J].工程设计学报,2025,32(1):23-31,9.基金项目
国家重点研发计划资助项目(2019YFA0708302) （2019YFA0708302）
国家自然科学基金资助项目(52270416) （52270416）
油气资源与探测国家重点实验室课题资助项目(PRE/DX-2402) （PRE/DX-2402）
