发明名称 |
Inner gauge ring drill bit |
摘要 |
A drill bit comprises a plurality of annular blades coupled to a bit body. A plurality of gauge pads is coupled to the bit body and defines an outer cutting diameter. A circumferentially continuous gauge ring is coupled to the bit body and defines an inner cutting diameter. An inner cutting structure is coupled to the bit body and has a cutting diameter substantially equal to the inner cutting diameter. |
申请公布号 |
US9359821(B2) |
申请公布日期 |
2016.06.07 |
申请号 |
US201313774591 |
申请日期 |
2013.02.22 |
申请人 |
National Oilwell Varco, L.P. |
发明人 |
Sauvageau Richard J. |
分类号 |
E21B10/04;E21B17/10;E21B10/60;E21B10/08;E21B10/14;E21B10/42;E21B10/48 |
主分类号 |
E21B10/04 |
代理机构 |
Porter Hedges LLP |
代理人 |
Forinash Derek V.;Porter Hedges LLP |
主权项 |
1. A drill bit comprising:
a bit body, including an outer bit body and an inner bit body rotationally secured to the outer bit body, wherein the outer bit body surrounds the inner bit body; a plurality of annular blades coupled to the outer bit body; a plurality of gauge pads coupled to the outer bit body and defining an outer cutting diameter; a circumferentially continuous gauge ring coupled to the outer bit body and defining an inner cutting diameter, wherein the plurality of annular blades includes a cutting face that extends from the outer cutting diameter to the inner cutting diameter; an inner cutting structure formed on the inner bit body and recessed into the outer bit body, wherein the inner cutting structure has a maximum diameter substantially equal to the inner cutting diameter; and a junk slot disposed across the outer bit body between two adjacent annular blades, wherein the junk slot provides a conduit to move formation cuttings from the inner cutting structure to an outer surface of the bit body. |
地址 |
Houston TX US |