| 摘要 |
<p>A stabilizer (10) for use in the rotary drilling of an earth borehole, including an elongate tubular body (12), at least three circumferentially disposed stabilizing blades (24) integrally formed on the body (12), each blade (24) having a first lateral wall (28) and a borehole-engaging surface (26), the intersection of said lateral wall (28) and borehole-engaging surface (26) forming a leading edge (34), each pair of adjacent blades defining a groove therebetween (32), a wear-resistant formation (38) positioned axially along each first lateral wall (28) at least along the lower end of each blade (24), said wear-resistant formation (38) having an exposed wear-resistant edge that is closely adjacent said leading edge (34), said wear-resistant formation (38) being formed of a material harder than that of said blade (24) and being free of any surface that projects radially outwardly of said borehole-engaging surface (26).</p> |
