Design and application of personalized PDC bit for volcanic rock formation in Longfengshan Gas Field
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摘要: 长岭断陷龙凤山气田主力储层主要分布在火山岩发育的营城组和火石岭组。储层岩石石英含量高、研磨性强，导致机械钻速低、单只钻头进尺短，大幅增加了起下钻换钻头等非生产时间，严重制约钻井提速。本文通过开展岩石力学实验研究，利用测井资料建立并修正岩石力学剖面，开展了异型PDC齿研发和钻头切削结构设计优化，研发出一种适合该区块火山岩地层的6刀翼异形齿PDC钻头，现场应用3井次，较其他普通PDC钻头平均进尺提高42.2%，平均机械钻速提高36%，提速降本效果显著。Abstract: The main reservoir of Longfengshan Gas field in Changling Fault Depression is distributed in Yingcheng and Huoshiling Formation where the igneous rock is abundant. The high quartz content and abrasive nature of the reservoir rock results in low ROP and short footage per bit, which greatly increases the non-productive time such as tripping and bit changing and thereby seriously restricts the drilling speed. In this paper, the rock mechanic section is established and corrected by the well logging data and the rock mechanics experimental study. A 6-blade shaped PDC bit was designed for the volcanic rock formation in the block by PDC bit composite design and optimization. It has been applied in 3 wells,compared with other common PDC bits, the average footage is increased by 42.2% and the average machine drilling speed is increased by 36%, which shows a remarkable effect for drilling speed up and cost reduction.
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