Downhole blower system with pin bearing
This disclosure describes various implementations of a downhole-blower system that can be used to boost production in a wellbore. The downhole-blower system includes a blower and an electric machine coupled to the blower that can be deployed in a wellbore, and that can, in cooperation, increase production through the wellbore.
1. A downhole-type blower system comprising:
a housing;
a stator within the housing;
a rotor carried by and supported to rotate within the housing;
a plurality of radial bearings supporting the rotor to rotate within the stator;
a thrust bearing at an end of the rotor, the thrust bearing comprising a pin bearing, the pin bearing comprising:
a ball;
a rotor indentation on an end of the rotor, the rotor indentation configured to receive the ball; and
a thrust indentation opposite the rotor indentation configured to receive the ball; and
a lubrication system within the housing to lubricate the pin bearing, the lubrication system comprising;
a lubrication reservoir configured to contain a bearing lubricant;
a flow path fluidically connecting the lubrication reservoir and the thrust bearing, the lubrication reservoir configured to be pressurized to provide lubricant continuously to the thrust bearing; and
a spring configured to apply a constant pressure to the lubrication reservoir.
2. The downhole-type blower system of claim 1 , wherein the plurality of radial bearings comprise passive magnetic repulsion bearings.
3. The downhole-type blower system of claim 2 , wherein the passive magnetic repulsion bearings are biased to provide an axial pre-load on the thrust bearing.
4. The downhole-type blower system of claim 1 , wherein the flow path is configured to meter a rate of lubrication to the thrust bearing.
5. The downhole-type blower system of claim 1 , wherein the spring comprises at least one of a metal spring, an air spring, or a bladder.
6. The downhole-type blower system of claim 1 , further comprising a bumper configured to maintain load on the thrust bearing, the load on the thrust bearing configured to prevent damage to the downhole-type blower during transportation and installation of the downhole-type blower.
7. A downhole-type compressor system, comprising:
a housing;
a stator within the housing;
a rotor within the housing;
a plurality of bearings supporting the rotor to rotate within the stator;
a thrust bearing at an end of the rotor, the thrust bearing comprising a pin bearing, the pin bearing comprising:
a curve-shaped rotor extension positioned axially on an end of the rotor; and
a curved recess configured to receive the rotor extension; and
a lubrication system within the housing to continuously lubricate the thrust bearing, the lubrication system comprising;
a lubrication reservoir;
a flow path fluidically connecting the lubrication reservoir and the thrust bearing; and
a spring to maintain a constant pressure in the lubrication reservoir.
8. The downhole-type compressor system of claim 7 , wherein the pin bearing comprises;
a semi-spherical rotor extension positioned axially on an end of the rotor; and
a semi-spherical recess configured to receive the semi-spherical rotor extension.
9. A downhole-type blower system comprising:
a housing;
a stator within the housing;
a rotor carried by and supported to rotate within the housing;
a plurality of radial bearings supporting the rotor to rotate within the stator;
a thrust bearing at an end of the rotor; and
a lubrication system within the housing to lubricate the thrust bearing, the lubrication system comprising;
a lubrication reservoir configured to contain a bearing lubricant;
a flow path fluidically connecting the lubrication reservoir and the thrust bearing, the lubrication reservoir configured to be pressurized to provide the bearing lubricant continuously to the thrust bearing; and
a spring configured to apply a constant pressure to the lubrication reservoir; and
a bumper configured to maintain load on the thrust bearing, the load on the thrust bearing configured to prevent damage to the downhole-type blower during transportation and installation of the downhole-type blower.