Downhole components for use in subsurface drilling

Details Downhole components for use in subsurface drilling Downhole components for use in subsurface drilling

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.

REFERENCES:
patent: 4109737 (1978-08-01), Bovenkerk
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patent: 4473125 (1984-09-01), Addudle et al.
patent: 4512425 (1985-04-01), Brock
patent: 4545441 (1985-10-01), Williamson
patent: 4811801 (1989-03-01), Salesky et al.
patent: 5131478 (1992-07-01), Brett et al.
patent: 5351770 (1994-10-01), Cawthorne et al.
patent: 5467836 (1995-11-01), Grimes et al.

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