室内和现场试验表明,装有加长喷咀和中心水眼的三牙轮钻头相硬质合金镶齿两牙轮钻头,在软地层和粘性地层中钻进时具有降低成本的巨大潜力。正当在加里福尼亚和阿拉斯加进行这方面试验时,在海湾沿岸地区也取得了同样的结果。试验证明,三牙轮铣齿钻头和硬质合金镶齿两牙轮钻头,采用加长喷咀与中心水眼组合对改善井底净化、提高机械钻速和降低每呎成本部是有效的。此外,改进硬质合金镶齿 In-house and field trials have shown that tricone bit two carbide bits with extended nozzle and center water eye have great potential for cost reduction when drilling in soft and viscous formations. Just as the tests in this area were conducted in California and Alaska, the same result was achieved in the Gulf Coast. Trials have shown that the combination of a three-tooth milling cutter and a carbide-tipped two-roller cone drill bit with an extended nozzle and a center-water eye is effective for improving bottom hole cleaning, increasing ROP and reducing cost per foot. In addition, improved carbide inserts