发明名称 |
WEAR INDICATORS FOR EXPANDABLE EARTH BORING APPARATUS |
摘要 |
An expandable underreamer apparatus disposed on a distal end of a drillstring and configured to drill a formation includes a substantially tubular main body adjacent a cutting head, the main body providing at least one axial recess configured to receive an arm assembly, and the arm assembly configured to translate between a retracted position and an extended position. The apparatus further includes a plurality of cutting elements disposed on the arm assembly, and a plurality of wear indicators imbedded in at least one arm assembly and positioned behind the cutting elements with respect to a direction of rotation of the arm assembly, wherein the wear indicators are configured to provide an increased torque to the drillstring upon contacting the formation. |
申请公布号 |
WO2009148784(A2) |
申请公布日期 |
2009.12.10 |
申请号 |
WO2009US43879 |
申请日期 |
2009.05.14 |
申请人 |
SMITH INTERNATIONAL, INC.;LAIRD, TOMMY;WHIPPLE, GORDON |
发明人 |
LAIRD, TOMMY;WHIPPLE, GORDON |
分类号 |
E21B12/02;E21B10/46;E21B12/04 |
主分类号 |
E21B12/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|