基本信息:
- 专利标题： Improvements in or relating to rotary drill bits
- 专利标题（中）：改进钻头
- 申请号：EP97300920.2 申请日：1997-02-13
- 公开(公告)号：EP0790386A3 公开(公告)日：1998-03-25
- 发明人： Newton, Alex , Murdock, Andrew , Deane, John , Barnes, Michael , Caraway, Douglas , Lamb, Haydn
- 申请人： CAMCO DRILLING GROUP LIMITED
- 申请人地址： Hycalog Oldends Lane Industrial Estate Stonehouse, Gloucestershire GL10 3RQ GB
- 专利权人： CAMCO DRILLING GROUP LIMITED
- 当前专利权人： CAMCO DRILLING GROUP LIMITED
- 当前专利权人地址： Hycalog Oldends Lane Industrial Estate Stonehouse, Gloucestershire GL10 3RQ GB
- 代理机构： Carter, Gerald
- 优先权： GB9603402 19960217
- 主分类号： E21B10/52
- IPC分类号： E21B10/52
摘要：
A rotary drill bit, for drilling holes in subsurface formations, comprises a bit body (10), cutting structures (14) mounted on the bit body, and a fluid supply system for supplying drilling fluid to the surface of the bit body, to cool and clean the cutting structures. The fluid supply system comprises a number of nozzles (17) mounted in the bit body, a main passage (20) in the bit body and a number of auxiliary passages (21) leading from the main passage to the nozzles. Some or all of the passages (20, 21) are at least partly lined with an erosion-resistant lining material (23). The lining material may comprise a hard facing applied to the internal surface of a preformed passage or a rigid tube which itself defines the internal surface of the passage.
公开/授权文献:
- EP0790386A2 Improvements in or relating to rotary drill bits 公开/授权日：1997-08-20
IPC结构图谱:
| E | 固定建筑物 |
| --E21 | 土层或岩石的钻进；采矿 |
| ----E21B | 土层或岩石的钻进；从井中开采油、气、水、可溶解或可熔化物质或矿物泥浆 |
| ------E21B10/00 | 钻头 |
| --------E21B10/46 | .以抗磨部件为特征的，例如，金刚石镶嵌 |
| ----------E21B10/50 | ..牙轮钻头 |
| ------------E21B10/52 | ...横刃型或金属镶齿型的镶嵌件的 |