发明名称 |
Side cutting gage pad improving stabilization and borehole integrity |
摘要 |
A drill bit including improved gage pads is particularly adapted for side cutting a borehole wall. In a preferred embodiment, the drill bit gage pads alternate between an active gage pad with a cutting surface portion and a non-active gage pad with a wear-resistant surface. Gage pad cutting elements placed on a first active gage pad cooperate with gage pad cutting elements placed on other active gage pads. What results is a contiguous series of overlapping cutting elements suitable to cut the borehole wall. Non-active gage pads are preferably placed between the active cutting gage pads. These non-active gage pads have a wear-resistant surface (such as steel or diamond insert) that extends to the gage diameter. These non-active gage pads help to maintain borehole size and prevent undue torque being placed on the drill bit.
|
申请公布号 |
US6684967(B2) |
申请公布日期 |
2004.02.03 |
申请号 |
US20010897580 |
申请日期 |
2001.07.02 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
MENSA-WILMOT GRAHAM;CHAN PETER K. |
分类号 |
E21B10/26;E21B10/42;E21B10/43;E21B10/54;E21B10/55;E21B17/10;(IPC1-7):E21B12/04 |
主分类号 |
E21B10/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|