适合柯柯亚区块的PDC钻头优化设计与现场应用

Optimal design and field application of PDC bit in Kekeya Block

柯柯亚区块是吐哈油田2009年的主要开发区块之一,针对该区块地层岩石强度高、研磨性高、夹层多、倾角大的特点,优化设计了一种个性化钻头——215.9 mm七刀翼M433PDC钻头,该钻头拥有浅锥轮廓的冠部形状、螺旋刀翼、高密度布齿、合适的后倾角（10~15°）及灵活性较强的非对称布置喷嘴和深水道布置的水力结构设计等特点。在柯19-10井的试验钻进过程中,在降低钻井周期、提高平均机械钻速（157%）、缩短复杂时效等方面取得了较为理想的效果,达到了降低钻井成本、提高综合经济效益的目的。

Kekeya block is one of the Turpan-Hami Oilfield＇s major development blocks,developed in 2009.The block＇s main geological features are high-intensity,high-abrasivity,extensive interlaying and a large angle.A block with these features is rare in China.Due to these extreme geological conditions,we designed a individual drilling bit,？215.9 mm 7 knife-wing M433 PDC bit,with crown shape of shallow cone,spiral knife-wing,high-density distribution of teeth,suitable back rake angles（10~15°） and hydraulic structure（high flexible and asymmetrical arrangement for nozzles and deep waterway）.During the drilling process of Ke Well 19-10, because the M433 PDC bit is consistent with the extreme geological conditions of the Kekeya block,it can shorten the drilling cycle, improve AROP 157% and reduce complex time efficiency.The design is useful to achieve relatively satisfactory results,to reduce drilling costs and to increase overall economic efficiency.