| 1. | This is jet bit and that is a pdc bit
这是喷射式钻头，那是人造聚晶金钢石钻头。 |
| 2. | Lateral force balancing design of blade pdc bits
钻头的侧向力平衡设计 |
| 3. | Numerical simulation about effect of flow path on pdc bit fluid field
钻头头部流场影响的数值模拟 |
| 4. | Application of pdc bit in shaqiu - 3 well area in shanan oilfield
钻头在沙南油田沙丘3井区的推广应用 |
| 5. | Optimization design of lateral force balance of pdc bits by genetic algorithm
钻头侧向力平衡优化设计 |
| 6. | Application of pdc bit in sihe mine coal seam predrainage drilling
钻头在寺河煤矿瓦斯预抽放钻井中的应用 |
| 7. | A study on cutting - volume computation of a pdc bit accounting for different cutting sequences
水化早期水泥净浆电导的特征及与凝结时间相关性的研究 |
| 8. | Polycrystalline diamond compact bit ( pdc bit ) is one of facilities in the drilling of petroleum and natural gas , and its capability , especially the rationality of the placing of cutting is very important to the speed and cost of drilling
Pdc钻头是油气钻井的重要工具，该钻头对地层的敏感性强，结构变化多、设计灵活，其性能(尤其是切削齿的布置合理性)对钻井速度和成本影响很大。 |
| 9. | With the development of the new technology of drilling , the exploitation of deep well and over - deep well needs small size bit . because one - cone bit has the advantages of the three - cone bit and the pdc bit and it makes for their disadvantages , so the one - cone bit is the important chose to drill the small well
随着钻探新技术的发展，开发深井和超深井技术要求钻头尺寸小型化，由于单牙轮钻头具有三牙轮钻头和pdc钻头的优点，同时又弥补了二者的不足。 |
| 10. | The design that the active protection is taken in the paper is a breakthrough of common methods of gage protection . on the basis of the well - done roller cone bits and pdc bits , three practicable schemes are provided . as a result of selection and design , two brand - new multiple drill bits are invented , that is , protector - tri - cone mdb and protector - single - cone mdb
本论文突破传统的被动保径思维，采用主动保径方法，并在业已成熟的牙轮钻头和pdc钻头技术的基础上，提出了三种可行的复合钻头实施方案，并经过精心选择和设计，推出两种新型复合钻头，即变径保径器?三牙轮复合钻头，变径保径器?单牙轮复合钻头。 |
