Optimization design and application of PDC bit in horizontal well
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摘要: 同常规直井、定向井聚晶金刚石(polycrystalline diamond compact,PDC)钻头相比,水平井钻头保径更易磨损、导向能力要求更高、切削齿所受冲击载荷更大。针对鄂尔多斯盆地红河油田水平段地层特点,通过室内试验优选切削齿尺寸和后倾角;针对水平井钻头的特点,设计了浅内锥、短外锥、大冠顶圆弧的钻头剖面形状,"主动保径齿+低摩擦保径块"的加强型保径及非对称、多喷嘴布置的加强水力结构。现场应用表明:新型钻头相比区块普通钻头,进尺提高了193%,机械钻速提高了132%。Abstract: Compared with conventional polycrystalline diamond compact (PDC) bits for vertical and directional drilling, the gauge is more easy to wear for horizontal PDC bit, which suffers more much impact load and requires better steer ability.According to the horizontal strata characteristics of Honghe oilfield in Ordos basin, the cutter size and back rake angle are optimized through indoor experiment.Based on the characteristics of horizontal well bit, the bit profile is designed to be of shallow inner cone, short external cone and big crown arc.The gauge is enhanced with "active gauge cutter and low friction gauge pad" and the hydraulic structure is enhanced with asymmetric and multinozzle arrangement.The field application shows that the footage of new drill bit is comparing to ordinary bit, the footage is increased by 193%comparing with that of ordinary bit, and the penetration rate is increased by 132%.
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Key words:
- horizontal well /
- steering ability /
- cutter arrangement design /
- enhanced gauge
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