发明名称 |
FORCE BALANCED ASYMMETRIC DRILLING REAMER |
摘要 |
A force balanced asymmetric drilling reamer comprising a plurality of blades, each blade having at least one cutter section and a gage section. The cutter section is designed to have a plurality of cutting devices for cutting through swelling formations and cutting free sloughing formations. The gage section has a full bore diameter with gage elements flushly coupled to gage section's outer surface. The blades may be curve/concave shaped or boomerang/chevron shaped, which thereby agitate the cutting beds. At least a portion of the drilling reamer's diameter is incrementally force balanced, starting from the outermost diameter, so that the net radial force is less than 10% of weight on bit with respect to the center of rotation. This balancing allows a greater cutter longevity and provides for a better wellbore condition. Optionally, at least a portion of the drilling reamer's surface may be treated by nitriding for repelling the cuttings.
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申请公布号 |
US2010051349(A1) |
申请公布日期 |
2010.03.04 |
申请号 |
US20090541591 |
申请日期 |
2009.08.14 |
申请人 |
VAREL INTERNATIONAL IND., L.P. |
发明人 |
BALLARD BRIAN D.;KING WILLIAM W. |
分类号 |
E21B10/00;E21B7/00;E21B10/26 |
主分类号 |
E21B10/00 |
代理机构 |
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