Mandrel and bearing assembly for downhole drilling motor

Details Mandrel and bearing assembly for downhole drilling motor Mandrel and bearing assembly for downhole drilling motor

2006-08-07

2009-06-23

Neuder, William P (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

Below-ground storage of motivating energy

C175S107000, C384S097000

Reexamination Certificate

active

07549487

ABSTRACT:
A downhole drilling motor beating assembly includes a tubular mandrel adapted to connect to a rotational power output of downhole motor. The bearing assembly includes a mandrel having: an upper end proximal to the downhole motor, a lower end with a pin connection distal from the motor, and a longitudinal passage through the mandrel from the upper end to the lower end. The assembly further includes at least one circumferential ring projecting radially outward from an other surface of the tubular mandrel. The ring has and upper shoulder and a lower shoulder and a radial surface. A circumferential upper thrust bushing contacts the upper shoulder of the ring and a circumferential lower thrust bushing contacts the lower shoulder of the ring. An upper thrust beating contacts the upper thrust bushing and a lower thrust bearing contacts the lower thrust bushing. A tubular bearing housing includes a longitudinal passage from an upper end of the housing to a lower end of the housing. The passage includes a lower portion with an internal diameter adapted to receive the lower end of the mandrel and an upper portion with a larger internal diameter adapted to receive the lower beating and bushing and the outer radial surface of the circumferential ring projecting from the mandrel and the upper bushing and beating.

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