吉木萨尔页岩地层PDC钻头破岩模拟及优选

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中图分类号：TE921 文献标识码：A DOI：10.12473/CPM.202411063

Abstract：Conventional planar-cutter PDC bit exhibits prominent problems in drilling，such as severe wear， frequentcutter breakage and short footage，resulting inlowdrilling eficiencyand high cost.To improve thedrilling speedandreduce the driling costin Jimsar shaleoil formation，research on novelmulti-edged PDC bit was carried out.Theshale formation hasapparentbedding characteristics，and its hardness ishigh．In modeling，the effects of rock poresand drilling fluid were not considered，and the temperature and wear in the cuting process were ignored to simplifythecalculation conditions.Considering the anisotropy of shale，a finite element model was builtbyusing Drucker-Prageryield criterion todescribe the mechanical behaviorof shale.Therock cuting simulation results show that the multi-edged cuter has obvious advantages over the planar cutter： its contact stress distribution is more uniform，the stresson it issmaller，andtheload fluctuationrange is low，which efectively solves the problem of rock“cohesion”and greatly improve therock breaking efficiency.In theactual driling of Jimsar shale formation，the novel multi-edgedPDC bit shows excellntperformance in both footage perbitrun and average rate of penetration.Compared with conventional planar-cuter bit，the novel design improves average rate of penetration by 35% and average footage per bit rn by 81% . The good rock breaking effect of the novel multi-edged PDC bit provides an important reference for bit optimization of shale formation.

Keywords：PDC bit；shale formation；cuter;multi-edged cutter;ROP improvement;rock breaking；Jimsar

0 引言

吉木萨尔地区蕴含着丰富的页岩油资源，其开采对于满足日益增长的能源需求、保障国家能源安全意义非凡。（剩余11419字）