兰陵铁矿小口径定向钻进PDC钻头设计与应用

Design and application of small‑diameter directional drilling PDC bit in Lanling iron ore

小口径定向钻进是解决高精度控矿勘探钻进的重要技术。针对兰陵铁矿区中硬岩石薄软互层小口径定向钻进施工碎岩PDC钻头广谱适应性问题,通过对钻头的冠部形状、刀翼布置、PDC切削齿镶焊角度、钻头水力结构及钻头胎体等几个方面的优化设计,研制了Ø98 mm定向钻进PDC钻头。经过中等硬度以上非均质地层3个定向钻探孔的应用验证,PDC钻头在抗冲击破坏、耐磨性、钻头寿命等方面取得了满意的效果,达到高效碎岩、连续稳定控向钻进的目的,为小口径定向钻进PDC钻头的设计及制造提供了一个有效解决方案。

The small-diameter directional drilling is an important technology to solve the problem of high-precision ore-controlled exploration and drilling.In view of the broad-spectrum adaptability of the PDC bit in small-diameter directional drilling construction for the hard rock with thin and soft interbed in the Lanling iron ore area,through the optimization design of the crown shape of the drill bit,the blade arrangement,the PDC cutting tooth inlay welding angle,the hydraulic structure of the drill bit and the drill bit carcass,theØ98 mm directional drilling PDC bit was developed.After the application verification of three directional drilling holes in heterogeneous strata above medium hardness,the PDC drill bits have achieved satisfactory results in impact damage resistance,wear resistance,service life,etc.,achieving the goal of efficient rock crushing and continuous and stable directional drilling,which provids an effective solution for the design and manufacture of small-diameter directional drilling PDC bits.