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    • 7. 发明授权
    • Bottom hole assembly for directional drilling
    • 底孔组件用于定向钻孔
    • US5857531A
    • 1999-01-12
    • US844489
    • 1997-04-18
    • James EstepLance D. UnderwoodAlbert Odell
    • James EstepLance D. UnderwoodAlbert Odell
    • E21B4/02E21B4/16E21B7/06E21B7/08E21B17/20
    • E21B7/067E21B17/20E21B4/02E21B4/16
    • The bottom hole assembly of the present invention includes a drill bit driven by a positive displacement drilling motor, the motor being constructed of tubular housings, one of said housings having a bend so as to cause the bit to drill directionally, another housing containing a rotor and stator to generate power, and a flexible section between the power generation housing and the bend. A stabilizer is disposed on one end of the flexible section for engaging the wall of the borehole and the housing with the bend includes a wear pad for engaging the lower side of the borehole. The bottom hole assembly contacts the borehole at three contact points, namely at the stabilizer, the wear pad, and the drill bit, for producing the necessary build-up rate, along with the bend, and thus the curvature of the borehole being drilled. The flexible section has a stiffness which is less than the stiffness of the housing of the stator and has a stiffness which is on the order of 33% or less of that of the power generation housing. The stiffness is determined by the selection of the material, wall thickness and length of the flexible section such that the desired flexibility is achieved, but the necessary torsional strength and axial load capabilities are maintained. The purpose of the flexible section is to allow the bottom hole assembly to be configured to achieve high build rates, on the order of 20 to 70 degrees per hundred feet, without generating excessively high loads and stresses on the bit and other bottom hole assembly components.
    • 本发明的底孔组件包括由正位移钻孔马达驱动的钻头,马达由管状壳体构成,所述壳体中的一个具有弯曲部以使钻头朝向定向钻孔,另一壳体包含转子 和定子以产生动力,以及在发电壳体和弯曲部之间的柔性部分。 稳定器设置在柔性部分的一端上,用于接合钻孔的壁,并且具有弯曲部的壳体包括用于接合钻孔的下侧的耐磨垫。 底孔组件在三个接触点处接触钻孔,即在稳定器,耐磨垫和钻头处,以产生必要的积聚速率以及弯曲,并因此产生钻孔的曲率。 柔性部分的刚度小于定子壳体的刚度,其刚度大约为发电壳体的刚度的33%或更小。 通过材料的选择,柔性部分的壁厚和长度来确定刚度,使得实现期望的柔性,但是维持必要的扭转强度和轴向载荷能力。 柔性部分的目的是允许底部孔组件被构造成实现高百分之二十到七十度的高建造速度,而不会在钻头和其它底部孔组件部件上产生过高的载荷和应力 。