| 发明名称 |
DOWNHOLE UNDER-REAMER AND ASSOCIATED METHODS |
| 摘要 |
A downhole under-reamer for use in reaming a downhole bore. The under-reamer comprises a body and a plurality of cutters mounted on the body. The cutters are mounted on the body so as to be extendable from a retracted position to at least two extended positions. The at least two extended positions comprise reaming positions at respective first and second reaming diameters. |
| 申请公布号 |
US2015376952(A1) |
申请公布日期 |
2015.12.31 |
| 申请号 |
US201514752274 |
申请日期 |
2015.06.26 |
| 申请人 |
NOV Downhole Eurasia Limited |
发明人 |
McCarthy Brian Andrew;Rodger Philip Graham |
| 分类号 |
E21B10/32;E21B7/28 |
主分类号 |
E21B10/32 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A downhole under-reamer for use in reaming a downhole bore, the under-reamer comprising
a body and a plurality of cutters mounted on the body, wherein the cutters are mounted on the body so as to be extendable from a retracted position to at least two extended positions, the at least two extended positions comprising a first extended position and a second extended position corresponding to reaming positions at respective first and second reaming diameters such that the under-reamer is capable of reaming a bore to a plurality of gauges. |
| 地址 |
Gloucestershire GB |
