中国石油大学学报（自然科学版）2026，Vol.50Issue(1)：135-144,10.DOI:10.3969/j.issn.1673-5005.2026.01.013
特深层强塑性地层PDC钻头高效破岩数值模拟
Numerical simulation of rock breaking mechanism of PDC bit in ultra-deep and ductile formation
摘要
Abstract
In oil and gas drilling of ultra and extra-deep formations,the fluid column pressure is very higher,and the rock at the bottom of the well is more compacted and ductile,which can cause extremely prominent problems on rock-breaking using the traditional PDC drill bits.In this study,downhole core samples from a well at a depth of 8078 m in Xinjiang South Rim block and seven different geometrical shapes of PDC teeth were used as testing materials for indoor rock-breaking experi-ments.Numerical simulation was also conducted to explore the rock cutting mechanisms of the special-shaped PDC teeth un-der the conditions of ultra-high bottom hole pressure in ultra-deep formation.The effects of cutting force,mechanical specific energy and aggressiveness of the PDC teeth were considered in order to analyze the influence of tooth structure on the rock-breaking performance of PDC drill bits.The results show that,under the condition of high confining pressure in ultra-deep formation,the difficulty of rock-breaking increases significantly,which is manifested in a significant increase of the cutting force and mechanical specific energy,and a significant decrease of the aggressiveness of the PDC tooth.Under a high confi-ning pressure of 140 MPa,planar PDC teeth have larger cutting force than that of three-ribbed ridge PDC teeth.In terms of mechanical specific energy and aggressiveness,the performance of three-ribbed ridge PDC teeth is better than that of planar PDC teeth.Comprehensively considering cutting force,mechanical specific energy and aggressiveness,the three-ribbed ridge PDC teeth have a more balanced performance,which is suitable for drilling operations in ultra-deep,high pressure and strongly ductile formation.关键词
特深层/高围压/异形PDC齿/泥岩/破岩机制Key words
ultra-deep formation/high confining pressure/special-shaped PDC teeth/mudstone/rock-breaking mechanism分类
能源科技引用本文复制引用
刘伟吉,王勇,祝效华,席传明,党文辉,张楠..特深层强塑性地层PDC钻头高效破岩数值模拟[J].中国石油大学学报（自然科学版）,2026,50(1):135-144,10.基金项目
国家自然科学基金杰出青年基金项目(52225401) （52225401）
