发明授权
- 专利标题: Pneumatic hammer drilling assembly for use in directional drilling
- 专利标题(中): 气动锤钻组件用于定向钻孔
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申请号: US09245063申请日: 1999-02-05
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公开(公告)号: US06290002B1公开(公告)日: 2001-09-18
- 发明人: Laurier E. Comeau , Ian Gillis , James Fehr , Christopher W. Konschuh
- 申请人: Laurier E. Comeau , Ian Gillis , James Fehr , Christopher W. Konschuh
- 优先权: CA2260612 19990203
- 主分类号: E21B704
- IPC分类号: E21B704
摘要:
A drilling assembly and a method for directional drilling using the drilling assembly. The drilling assembly comprises a drilling bit, a near bit stabilizer and an adjustable gauge stabilizer. The near bit stabilizer is located a first axial distance from a distal end of the drilling assembly and has a near bit stabilizer gauge which is greater than a nominal drilling assembly gauge. The adjustable gauge stabilizer is located a second axial distance from the distal end, which is greater than the first axial distance, and is adjustable between an extended and retracted gauge. The retracted gauge is less than the near bit stabilizer gauge. A bit drop angle is created between the drilling assembly and the drilling bit, while a stabilizer angle is created between the near bit stabilizer and the adjustable gauge stabilizer. The combination of the bit drop angle and the stabilizer angle results in a net build angle of the drilling assembly, when the adjustable gauge stabilizer is adjusted to the retracted gauge, and a net drop angle when adjusted to the extended gauge.
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