冲击载荷作用下斧形齿和三棱齿破岩效果试验研究

打开文本图片集

中图分类号：TE921文献标识码：A DOI：10.12473/CPM.202501013

Abstract：In drilling engineering，optimized cutter selection for specific formations is critical to enhance rock breaking efficiency.To this end，a Split Hopkinson Pressure Bar（SHPB）apparatus was used to conduct impactinduced rock breaking tests of triangular-ridged and axe-shaped cuters under impact load.By means of analyzing rock breaking volume of cuters atdiferent impact speeds using 3D scanning technology，therock breaking effect of single cuter was evaluated.Then，thechanges in disspated energy of diffrent types of cuters during rock breaking were analyzed，andthe variation lawof rock-breaking specific energy of cuterat diferent impact speeds were discussed.The studyresults show thatthe volume of impactcraterincreases with the increase of impact speed，and the volume of impact craterof axe-shaped cutter is smallerthan thatoftriangular-ridged cuter.At the same speed， thefractal dimensionand energy to fracture eficiencyof axe-shaped cutteraregreaterthanthoseoftriangular-ridged cuter.Atlow impact speed，therock-breaking specific energy of triangular-ridged cutter is smaller.At high impact speed，the rock breaking eficiency of axe-shaped cuter is higher.The study conclusions provide references for enhancing ROP and improving eficiency ofPDC cutterin percussive drilling of hard rock formations.

Keywords： PDC special-shaped cuttr;impact load;SHPB test；axe-shaped cuter; fractal dimension； rock breaking effect

0 引言

在世界能源日益紧缺，石油钻探行业逐渐向深部地层进发的背景下，在钻井工程中如何进一步提升钻探速度、减少钻井成本成为高效破岩的重要参照依据。（剩余14253字）