Housing, mandrel and bearing assembly positionable in a wellbore

摘要

A housing, mandrel and bearing assembly positionable in a wellbore includes a torque transmission member adapted to connect to a source of rotational torque (e.g. a downhole motor power output) and a tubular mandrel adapted to connect to a drill bit. A lower tubular housing is adapted to contain a lower bearing and catch sleeve assembly. The catch assembly is adapted to retain the mandrel in the lower housing if the mandrel breaks. An upper tubular housing contains an upper bearing and is adapted to connect to a housing of the downhole motor. A method of assembling the downhole housing, mandrel and bearing assembly is disclosed.

主权项

1. A housing, mandrel and bearing assembly comprising:
a torque transmission member having:
an upper end adapted to receive rotational torque power from a source of rotational torque,a lower portion with a longitudinal cavity with an open lower end, at least a portion of said cavity having an internal connector,a lower end having a connector; a tubular mandrel adapted at a lower end to connect to a drill bit, said tubular mandrel having:
an upper portion of the tubular mandrel with an external surface including a connector adapted to connect to the internal connector in the longitudinal cavity of the torque transmission member,a longitudinal passage through the mandrel from an upper end to the lower end,a shoulder disposed on a portion of the external surface of the tubular mandrel between the upper portion of the tubular mandrel and a lower portion of the tubular mandrel, said upper portion having a first outside diameter d1 and said lower portion having a second outside diameter d2, wherein the second outside diameter d2 is greater than the first outside diameter d1; a lower tubular housing having:
a longitudinal passage from an upper end of the lower tubular housing to a lower end of the lower tubular housing,an upper portion having a connector, an upper tubular housing having:
a longitudinal passage from an upper end of the upper tubular housing to a lower end of the upper tubular housing,said longitudinal passage having a lower portion with an internal diameter adapted to receive an upper bearing,said lower portion of the longitudinal passage adapted to connect to the connector on the upper portion of the lower tubular housing; an upper bearing disposed in the longitudinal passage of the upper tubular housing contacting the lower end of the torque transmission member; and a lower bearing disposed on the tubular mandrel and contacting the lower housing.