发明名称 |
Apparatus and method for connecting wellbore tubulars |
摘要 |
The present invention discloses an apparatus and method for controlling a power tong unit having a power spinner and, in a preferred embodiment, three power jaws. The control system controls grip pressure applied by a selected power jaw to a first wellbore tubular to provide a relatively reduced grip pressure when the power spinner is activated to thereby rotate a second wellbore tubular at a relatively high rotation speed but with a relatively low torque. The control system applies a relatively high grip pressure to two selected power jaws used for applying high torque but at a relatively slow rotation speed for final making up or initial breaking out of the wellbore tubulars with respect to each other.
|
申请公布号 |
US6634259(B2) |
申请公布日期 |
2003.10.21 |
申请号 |
US20010021225 |
申请日期 |
2001.12.12 |
申请人 |
FRANK'S INTERNATIONAL, INC. |
发明人 |
CASTILLE DALE J. |
分类号 |
E21B19/16;(IPC1-7):B25B13/50 |
主分类号 |
E21B19/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|