发明名称 |
DUAL STRING ORBITAL DRILLING SYSTEM |
摘要 |
A dual string drilling system for drilling a well bore in an earth formation , having a rotatable, tubular outer drill string and an upper rotatable, tubular inner drill string. An elongate tubular drill bit is mounted to a distal end of the outer drill string. The tubular drill bit having an interior passageway having a longitudinal axis which is inclined with respec t to the longitudinal axis of the outer drill string. The drill bit is further provided with a cutaway portion extending through a wall of the tubular outer drill string. A lower rotatable inner drill string is coupled to the upper rotatable tubular inner drill string and is disposed within the interior passageway of the drill bit. A second drill bit is mounted to the distal of the lower inner drill string and is sized to extend beyond the drill bit mounted to the outer drill string.
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申请公布号 |
CA2658134(A1) |
申请公布日期 |
2009.09.06 |
申请号 |
CA20092658134 |
申请日期 |
2009.03.06 |
申请人 |
ABLE, CHARLES C.;ABLE, ROBERT E. |
发明人 |
ABLE, CHARLES C.;ABLE, ROBERT E. |
分类号 |
E21B17/18 |
主分类号 |
E21B17/18 |
代理机构 |
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