公开(公告)号：US5901798A

公开(公告)日：1999-05-11

申请号：US628719

申请日：1996-09-09

申请人： Derek Herrera ,  Alex Joseph Gerard Herrera ,  Gregory John Herrera ,  John Philip Corkhill

发明人： Derek Herrera ,  Alex Joseph Gerard Herrera ,  Gregory John Herrera ,  John Philip Corkhill

IPC分类号： E21B17/10

CPC分类号： E21B17/1085 ,  E21B17/105 ,  E21B17/1064

摘要： A drill pipe protector comprises an annular body (820) adapted to surround a drill pipe (824) in a borehole to protect the drill pipe and borehole (or borehole casing) against damage caused by contact between the two, such that the drill pipe may rotate freely within the annular body upon contact between the body and the borehole (or borehole casing), so as to reduce the torque and drag produced by such contact. The assembly may further include annular clamps (822) secured to the drill pipe (824) to restrict the longitudinal movement of the body along the pipe. Various features of such assemblies are disclosed including features of the shape and configuration of the annular body and clamps, the use of bearing members on the internal and external surfaces of the annular body and between the body and the clamps or drill pipe joints, and materials for use in the fabrication of the body and bearings. These are particularly concerned with optimising the bearing arrangements to promote thin film lubrication and to employ sacrificial self-lubrication when such thin film lubrication breaks down, configuring the assembly to promote fluid flow around and through the assembly and the avoidance of snagging of the assembly on downhole obstructions.

摘要翻译： PCT No.PCT / GB94 / 02236 Sec。 371日期1996年9月16日 102（e）日期1996年9月16日PCT 1994年10月12日PCT PCT。 公开号WO95 / 10685 日期1995年4月20日钻杆保护器包括适于围绕钻孔中的钻杆（824）的环形体（820），以保护钻杆和钻孔（或钻孔套管）免​​受两者之间的接触造成的损坏， 当管体和钻孔（或钻孔套管）接触时，钻杆可以在环形体内自由旋转，以便减少由这种接触产生的扭矩和阻力。 组件还可以包括固定到钻杆（824）上的环形夹具（822），以限制主体沿管道的纵向移动。 公开了这种组件的各种特征，包括环形体和夹具的形状和构造的特征，在环形体的内表面和外表面上以及本体与夹具或钻杆接头之间以及材料的使用 用于制造车身和轴承。 这些特别涉及优化轴承布置以促进薄膜润滑，并且当这种薄膜润滑分解时采用牺牲自润滑，构造组件以促进流体流动并通过组件，并避免组件阻塞 井下障碍物