Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1996-03-19
1998-10-13
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175432, E21B 1056
Patent
active
058198628
ABSTRACT:
In a rotary drag-type drill bit, or other downhole component used in subsurface drilling, bearing pads which engage the surface of the earthen formation of the borehole carry wear-resistant bearing inserts received in sockets in the bearing pad. Each bearing insert includes a preform element of the kind normally used as cutting elements in drag-type drill bits, and having a front facing table of polycrystalline diamond bonded to a less hard substrate. The preform element is orientated so that its front diamond surface is tangential to the surface of the bearing pad, or at a slight angle thereto, so as to provide a highly wear-resistant, but non-aggressive bearing insert. The preform element may be bonded to or partly embedded in a carrier which is received within the socket. The element or carrier may be formed with spaced longitudinal ribs to allow it to be force-fitted into the socket, or the element or carrier may be secured within a hollow sleeve which is formed with such ribs.
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Hayward John
Lamb Haydn Richard
Matthias Terry R.
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