• 责任者：Yao Ercang (Geolgical Brigade No.208 ; Burea of Nuclear Industry ; Baotou 014010 ; China) ; Xing Yu’en
• 刊名：Geology and Prospecting
• 出版年：2011
• 卷期：47(2)
• 关键词：复合片钻头 ; polycrystalline diamond compact bit ; 钻进速度 ; penetration rate
• 页码：p.316-322
• 图表：4 illus., 2 tables, 20 refs.
• 分类号：2000
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

To solve the problem of low drilling efficiency at dense mudstone in uranium deposits of disseminated sandstone type, the authors conducted in situ tests of the serrate and circular-plate composite bits in the Bayingebi Basin of Inner Mongolia. For the dense mudstone of relatively strong abrasive resistance and big hardness, the authors utilized Φ110 mm serrate composite bits of double-ring and step style (eight sets) to obtain a drilling rate 3.31m/h, an increase of 25% than usual. And the drilling rate of the Φ110 mm serrate composite bits of double-ring and flat bottom style (eight sets) was as high as 4.38 m/h, enhanced by 20% in comparison with general composite bits.