The invention relates to a ball type friction reducing and resistance reducing short section for drilling horizontal wells and extended reach wells in drilling engineering of petroleum and natural gas industries. It solves the problem of large frictional resistance between drill stem and shaft lining during horizontal drilling and extended reach well drilling, and the difficulty of axial feeding and circumferential rotation of drill string. The technical scheme is that the axial sink is arranged on each support rib of the shell, a circular blind hole is set in the middle of the axial sink, and the screw holes are set at both ends of the axial sink, and the ball is installed in the hemispherical groove in the center of the upper end of the ball seat, the upper end of the ball seat and the lower end of the cap are threaded, and the ball seat, cover and ball are installed in the shell as a whole. In the circular blind hole in the middle of the axial sinking groove on the reinforcing tendon, the pressure plate is installed in the axial sinking groove on the reinforcing rib of the shell, and the pressing plate is screwed tightly with the shell. The invention can effectively reduce the axial frictional resistance and circumferential frictional resistance between the drill string and borehole in horizontal wells, and extend the length of drilling in horizontal wells.
【技术实现步骤摘要】
一种球式减摩降阻短节
本专利技术涉及一种石油天然气行业钻井工程中钻水平井和大位移井用的球式减摩降阻短节。
技术介绍
随着石油天然气行业旋转导向钻井技术等高新钻井技术的不断发展和进步,水平井和大位移井得到越来越广泛的应用。水平井和大位移井具有很长的水平位移,所以在钻水平井和大位移井的过程中,钻柱侧卧在井眼上,钻柱与井壁或者套管之间的摩擦阻力很大。和竖直井相比,在水平井和大位移井钻井过程中,钻柱自身的重力被水平段井眼承受,钻压难以有效施加给钻头,钻柱和井眼之间具有很大的摩擦阻力,严重阻碍了钻柱送进。因此,减小钻柱和井眼之间的摩擦阻力,帮助钻柱送进是水平井和大位移井钻井工程中最为直接有效的技术方法。目前减小钻柱和井眼之间摩擦阻力的普遍方法是在在钻柱上安装多组减摩短节,利用减摩短节和井壁或者套管直接接触,由于减摩短节和井壁或者套管之间的摩擦系数远小于钻柱和井壁或者套管之间的摩擦系数,故可以有效减小钻柱和井眼之间的摩擦阻力。现在广泛应用的减摩短节是利用销轴把滚轮安装在减摩短节本体上,利用滚轮和井壁或者套管之间滚动减小钻柱送进的摩擦阻力。然而这类利用滚轮的减摩短节仅仅减小了钻 ...
【技术保护点】
一种球式减摩降阻短节,是由螺钉(1)、压板(2)、封盖(3)、滚球(4)、球座(5)和壳体(6)构成;其特征是:壳体(6)上端设置有公扣,壳体(6)下端设置有母扣,壳体(6)上部周向均匀设置三个扶正筋,壳体(6)下部周向均匀设置三个扶正筋,壳体(6)上部三个扶正筋和下部三个扶正筋的周向相位相差60°,壳体(6)每个扶正筋上均设置有轴向沉槽,轴向沉槽中部设置一圆形盲孔,轴向沉槽两端设置有螺纹孔;球座(5)上端中心设置一半球形凹槽,半球形凹槽上设置有球座防磨层(51),球座(5)外圆上端设置有公螺纹;封盖(3)中心设置一通孔,通孔壁面设置为球面,通孔壁面上设置有封盖防磨层(31 ...
【技术特征摘要】
1.一种球式减摩降阻短节,是由螺钉(1)、压板(2)、封盖(3)、滚球(4)、球座(5)和壳体(6)构成;其特征是:壳体(6)上端设置有公扣,壳体(6)下端设置有母扣,壳体(6)上部周向均匀设置三个扶正筋,壳体(6)下部周向均匀设置三个扶正筋,壳体(6)上部三个扶正筋和下部三个扶正筋的周向相位相差60°,壳体(6)每个扶正筋上均设置有轴向沉槽,轴向沉槽中部设置一圆形盲孔,轴向沉槽两端设置有螺纹孔;球座(5)上端中心设置一半球形凹槽,半球形凹槽上设置有球座防磨层(5...
【专利技术属性】
技术研发人员:张梁,李镕成,周加伟,杨静远,马胜吉,梁政,赵勇,
申请(专利权)人:西南石油大学,
类型:发明
国别省市:四川,51
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