金3井混镶金刚石钻头的设计与应用

针对东北地区金3井沙河子组致密泥岩和砂砾岩互层，地层软硬交错、研磨性强，钻进机械效率低，钻头寿命短的问题，通过改进胎体配方、采用耐磨的混镶金刚石热压镶嵌齿作为切削齿、优化了钻头的切削结构、采用CFD软件进行钻头水力结构模拟与优化，研制了混镶金刚石钻头（ NR826M）。所设计的钻头在金3井共使用了3只，总进尺784.69 m，钻头平均机械钻速1.03 m/h，单只钻头最高进尺295.03 m，钻头寿命是牙轮钻头的6.5倍，机械钻速是牙轮钻头的1.5倍，为该井缩短了钻井周期40天，降低了钻井施工成本，也为该地区同类地层的钻头选型提供了更多的选择。

Design and Application of Mix Setting Diamond Bit for Well Jin-3

Well Jin-3 is in the Northeast of China.Aimed at Shahezi Fm of compact mudstone, soft-hard interbedded for-mations, strong abrasive, low ROP and short service life of bit, through improving matrix formula, taking wear resistant surface set natural diamond and impregnated synthetic diamond inlaid teeth by hot pressing as cutting teeth, optimizing the cutting structure of the bit, simulating and optimizing the bit hydraulic structure by CFD software, the new mix setting dia-mond bit （ NR826M） was developed.The total footage reached 784.69m in well Jin-3 with only 3 this newly designed bits, the average ROP was 1.05m/h, the highest footage of one bit was 295m;the service life and the ROP were 6.5 times and 1.5 times higher than those of rock bit respectively, which shortens drilling cycle for 40 days with the reduction of drill-ing cost, and provides more choices for bit selection in the similar strata of this area.