在乌鲁木齐冲洪积扇的中下缘,第四系地层厚达300多米,主要为卵砾石层。卵石粒径5～10cm,最大20cm 左右,其成分为砂岩、灰岩等。我公司在该区承担八口水井的设计施工,设计井深280米,终孔井径550mm;0～100米井斜不大于1°;下部井斜不大于2.5°。本文想就此工程谈谈使用阶梯牙轮钻头的一点体会。 In Urumqi alluvial fan in the lower edge of the Quaternary formation thickness of 300 meters, mainly for the gravel layer. Pebble diameter of 5 ~ 10cm, the maximum about 20cm, the composition of sandstone, limestone and so on. My company in the area to undertake the design and construction of eight wells, the design depth of 280 meters, the final hole diameter 550mm; 0 ~ 100 meters well inclination not more than 1 °; the lower part of the well inclination of not more than 2.5 °. This article would like to talk about this project to use the ladder roller bit experience.