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    • 9. 发明授权
    • Steerable drilling system and method
    • 可行钻井系统及方法
    • US07147066B2
    • 2006-12-12
    • US10230709
    • 2002-08-29
    • Chen-Kang D. ChenThomas M. GaynorDaniel D. GleitmanJohn R. Hardin, Jr.Colin WalkerM. Vikram RaoRoger Boulton
    • Chen-Kang D. ChenThomas M. GaynorDaniel D. GleitmanJohn R. Hardin, Jr.Colin WalkerM. Vikram RaoRoger Boulton
    • E21B7/04E02D29/00
    • E21B7/068E21B7/067E21B47/01
    • A bottom hole assembly 10 for drilling a deviated borehole includes a positive displacement motor (PDM) 12 or a rotary steerable device (RSD) 110 having a substantially uniform diameter motor housing outer surface without stabilizers extending radially therefrom. In a PDM application, the motor housing 14 may have 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 may have a bit face 22 with cutters 28 thereon and a gauge section 24 having a uniform diameter cylindrical surface 26. The gauge section 24 preferably 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 preferably is less than twelve times the bit diameter. According to the method of the present invention, the bit may be rotated at a speed of less than 350 rpm by the PDM and/or rotation of the RSD from the surface.
    • 用于钻出偏斜钻孔的底孔组件10包括具有基本均匀直径的马达壳体外表面的正位移马达(PDM)12或旋转可操纵装置(RSD)110,而不具有从其径向延伸的稳定器。 在PDM应用中,马达壳体14可以在上功率部分16和下轴承部分18之间具有固定弯曲。 由电动机10供电的长规格位20可以具有在其上具有切割器28的钻头面22和具有均匀直径的圆柱形表面26的量规部分24。 计量部分24优选地具有至少钻头直径的75%的轴向长度。 钻头面和马达壳体的弯曲部之间的轴向间距优选小于钻头直径的十二倍。 根据本发明的方法,该钻头可以通过PDM以及/或RSD从表面的旋转以小于350rpm的速度旋转。