CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.•理解钻头剖面结构•剖面结构对钻头性能的影响•后倒角特点•力平衡设计•切削结构特点•新的设计软件的应用-IDEAS内容CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.钻头剖面钻头剖面直接影响到以下性能:•钻头稳定性•钻头导向性•布齿密度•钻头寿命•ROP•清洗和冷却效果注：钻头的剖面设计必须与钻井环境需要相匹配CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.钻头剖面结构组成钻头剖面包括:•顶点•锥形面•鼻部•肩部•外径弧面•保径部分顶点锥形面鼻部保径部分外径弧面肩部CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.锥面角顶点–钻头的几何中心点锥面–通常用角度来表示特点：•深锥面(~90°)•浅锥面(~150°)CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.深锥面特点优点：•较高的稳定性•中心区域的金刚石覆盖率大不足之处：•导向性不好；•清洗效果不好；•攻击能力低。CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.浅锥面特点：优点：•导向性强；•清洗效果好；•攻击性强。不足之处：•稳定性差；•金刚石覆盖率低。CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.鼻部位置定义鼻部定义LRCONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.鼻部曲面特点大曲面(R)：通过大的表面面积来达到很好的抗冲击能力，适合在硬且夹层多的地层中使用。小或称尖曲面(r)：可在切削片上形成较高的点式冲击，适合于软且均质性好的地层。得到较高的ROP.RrCONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.鼻部与中心距离的关系鼻部与中心距离小可提供给肩部更大的表面面积和布齿密度，•适合软但是研磨性强的地层鼻部与保径部位距离近可给钻头冠部提供更大冠面面积从而得到更好的冲击能力，适合比较硬的地层LLCONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.肩部，外径曲面和保径肩部•从鼻部外缘线到过渡面的曲面部分。外径曲面•“外径曲面”保持肩部和保径部分之间光滑的曲面。保径•有助于钻头稳定和保持井眼尺寸。CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.钻头冠面的类型4种常规类型：•平抛面•短抛面•中抛面•长抛面平抛面常用在较硬且研磨性弱的地层；而长抛面常用在较软而且研磨性很强的地层。CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.平抛面应用：•硬，非研磨性地层•(Ej.:L石灰岩，白云岩)•强力定向作业钻头冠面的类型CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.应用：•硬且中等研磨性地层(Ej.:Calcareoussandstone,limestone,cherts)•典型的定向作业短抛面钻头冠面的类型CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreproducedwithoutwrittenpermissionfromSmithInternational,Inc.应用:•中硬到硬且研磨性强的地层(i.e.:Sandstone,limestone,hardshales)•转盘或是马达钻井作业中抛面钻头冠面的类型CONFIDENTIAL:ForInternalUseOnly.Maynotbedisclosed,usedorreprod...
