深厚漂卵石地层中超大直径钻井冲抓工艺的研究及应用

Study on Impact Grab Ultra Large Diameter Drilling in Deep Gravel Boulder Formation and the Application

摘要:

介绍了在直径8.3 m、深度285 m钻井井筒内，应用冲抓锥抓取漂卵石进尺并与回转钻进工艺相结合，完成超大直径钻井的工艺技术。主要包括冲抓设备参数的选取、冲抓工艺及技术参数的确定等。

Abstract:

The paper presented the application of cone grab in grabbing gravel footage and combining with rotary drilling technology for ultra drilling in bored shaft with diameter of 8.3m and depth of 285m, and introduced the parameter selection for grabbing equipment, grabbing process and the determination of technical parameter.