| 1. | Drilling technology for thicker conglomerate in the well ta
塔1井巨厚砾石层钻井技术 |
| 2. | Boring technology for pile foundation with deep gravel layer
高速公路深厚卵砾石层桩基成孔技术 |
| 3. | Infixion method used in gravel
砾石层中适宜选用的钻进方法 |
| 4. | Drilling gravel formations in the western area : challenges and solutions
西部地区砾石层钻井难点及对策 |
| 5. | The larger reverse circulation bits used for drilling through pebbles
卵砾石层大直径反循环桩孔钻进用钻头 |
| 6. | Study of blasting techniques of frozen gravel stratum in vertical well tunneling
立井掘进冻结砾石层爆破技术初步研究 |
| 7. | Fast drilling technology on deep overburden gravel layer in treatment of coal gob area
采空区治理工程中深覆盖厚卵砾石层钻进施工 |
| 8. | Application of casing drilling and dth drilling combined technique for boulder formation
潜孔锤复合性钻进工艺在河床卵砾石层中的应用 |
| 9. | Application of diamond - enhanced tungsten carbide composite button bit - a discussion
金刚石增强型硬质合金复合齿钻头在卵砾石层中的应用 |
| 10. | Large gravel bed
大砾石层 |
