锥形PDC齿犁切破岩受力试验研究  

Test of Force of Conical PDC Cutter during Rock Plow-breaking

作　　者：孙源秀[1] 邹德永[1] 侯绪田[2] 豆宁辉[2] 

机构地区：[1]中国石油大学(华东)石油工程学院 [2]中国石化石油工程技术研究院

出　　处：《石油机械》2014年第9期23-26,共4页China Petroleum Machinery

基　　金：国家科技重大专项"中东富油气区复杂地层井筒关键技术"(2011ZX05031-004)

摘　　要：鉴于锥形PDC齿的相关理论与技术研究尚处于起步阶段,国内还未见相关研究报道的现状,设计了锥形PDC齿,通过单齿破岩试验分析了锥顶直径、切削角、吃入深度和岩石硬度等主要参数对锥形PDC齿受力的影响,同时将锥形PDC齿受力与常规PDC齿进行了对比。分析结果表明,在相同的吃入深度下,锥形PDC齿所受的轴向力和切向力均随锥顶直径的增大而增大,说明锥形齿越尖锐,吃入岩石的能力越强;在钻进花岗岩、大理岩和石灰岩时,切削角为15°时的轴向力最小,吃入岩石能力最强;在吃入深度相同的情况下,锥形PDC齿所受轴向力和切向力都小于常规PDC齿,锥形PDC齿的破岩方式为犁切破岩。研究成果对研制高效破碎硬地层的新型PDC钻头具有一定的指导意义。PDC cutters on the cutter forces. The results showed that, given the same biting depth, the axial force and tangential force of the conical PDC cutter both increase with the stinger cutter vertex diameter, which indicates that the sharper the conical cutter is, the greater biting capacity the conical cutter has. In drilling granite, marble and limestone, the minimum axial force and the greatest biting capacity will be gained when the cutting angle is 15°. Given the same biting depth, the axial force and tangential force of the conical PDC cutter are smaller than that of conventional PDC cutters. The rock breaking model of the conical PDC cutter is plow-breaking.

关 键 词：锥形PDC齿 犁切破岩 切削角 锥顶直径 吃入深度 岩石硬度 

分 类 号：TE921[石油与天然气工程—石油机械设备]