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一、华北刮刀钻头的概况和低喷咀钻头试验的提出 华北地区上第三系馆陶组地层中段以下,含砾砂岩成份随井深而增加,馆陶组底部约1700—1900米井段,普遍有一层厚50米到100米的砾石层,胶结比较疏松,但研磨性高。刮刀钻头在馆陶组,尤其是底砾岩,磨损很严重。一般用一只硬质合金刮刀钻头只能钻到砾石层顶部,根据78年130口井资料统计,第一只刮刀钻头平均进尺1457米,其中有百分之五十的钻头达到1710米/只。因此还需要1—2只刮刀或牙轮钻头才能钻穿底砾岩。雁
First, North China blade bit profile and low nozzle bit test proposed in the North China Paleogene Guantao stratigraphic below the middle, gravel sandstone composition with the depth of the well, the bottom of the Guantao group about 1700-1900 meters well section, there is a Layer thickness of 50 meters to 100 meters of gravel layer, cement loose, but grinding high. Drill bit in the Guantao group, especially the bottom of conglomerate, wear and tear is very serious. Generally, a carbide scraper bit can only drill to the top of the gravel layer. According to statistics of 130 wells in 78 years, the first scraper bit averaged 1,457 meters, of which 50% got 1710 meters / piece . Therefore, 1-2 spatulas or roller cone bits are required to drill through the bottom conglomerate. Goose