发明名称 |
Bi-center bit with oppositely disposed cutting surfaces |
摘要 |
An improved bi-center bit with improved directional stability and wear resistance is disclosed, which bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further the pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
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申请公布号 |
US5992548(A) |
申请公布日期 |
1999.11.30 |
申请号 |
US19970955147 |
申请日期 |
1997.10.21 |
申请人 |
DIAMOND PRODUCTS INTERNATIONAL, INC. |
发明人 |
SILVA, ROGER;WESTON, BRAD;REBOLLIDO, HENRY;FIELDER, COY M. |
分类号 |
E21B10/26;E21B10/42;E21B10/43;E21B10/54;E21B10/55;E21B10/56;E21B10/567;E21B10/573;E21B17/10;(IPC1-7):E21B10/26 |
主分类号 |
E21B10/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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