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1. 发明授权

US06269892B1 Steerable drilling system and method 有权
标题翻译：可行钻井系统及方法
公开(公告)号：US06269892B1
公开(公告)日：2001-08-07
申请号：US09217764
申请日：1998-12-21
申请人： Roger Boulton , Chen-Kang D. Chen , Thomas C. Gaynor , M. Vikram Rao
发明人： Roger Boulton , Chen-Kang D. Chen , Thomas C. Gaynor , M. Vikram Rao
IPC分类号： E21B704
CPC分类号： E21B7/068 , E21B7/067 , E21B47/01
摘要： A bottom hole assembly 10 for drilling a deviated borehole includes a positive displacement motor 12 having a substantially uniform diameter motor housing outer surface without stabilizers extending radially therefrom. The motor housing 14 has a fixed bend therein between an upper power section 16 and a lower bearing section 18. The long gauge bit 20 powered by the motor 10 has a bit face 22 with cutters 28 thereon and a gauge section 24 having a uniform diameter cylindrical surface 26. The gauge section 24 has an axial length at least 75% of the bit diameter. The axial spacing between the bit face and the bend of the motor housing is less than ten times the bit diameter. According to the method of the present invention, fluid is pumped through the downhole motor to rotate the bit at a speed of less than 350 rpm. A substantial portion of the curved borehole section may be drilled while sliding rather than rotating the motor housing.
摘要翻译：用于钻出偏斜钻孔的底孔组件10包括具有基本上均匀直径的马达的容积式马达12，该马达具有外部表面，而没有从其径向延伸的稳定器。电动机壳体14在上功率部分16和下轴承部分18之间具有固定的弯曲。由电动机10供电的长规格钻头20具有在其上具有切割器28的钻头面22和具有均匀直径的量规部分24 表面部分24的轴向长度至少为钻头直径的75％。钻头面和马达外壳的弯头之间的轴向间距小于钻头直径的十倍。根据本发明的方法，将流体泵送通过井下电动机，以小于350rpm的速度旋转钻头。可以在滑动而不是旋转电动机壳体的同时钻出弯曲钻孔部分的大部分。

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