Abstract: An electrical submersible pump assembly includes a motor having a stator with a bore extending along a longitudinal axis. A shaft with axially spaced apart rotor sections extends longitudinally through the bore. At least one lubricant pump is mounted to the shaft within the bore for circulating motor lubricant within the bore. A bearing carrier has an inner diameter in sliding engagement with an outer diameter of the lubricant pump. An anti-rotation member on an outer diameter of the carrier is in engagement with the bore of the stator to prevent rotation of the carrier.

Abstract: A method of monitoring an enclosed environment includes disposing a sensor assembly in an environment enclosed by an enclosure, where the sensor assembly includes a transmitter configured to communicate using near-field magnetic induction. A receiver is disposed outside the enclosure and configured to communicate with the transmitter using near-field magnetic induction. The receiver is to a communications device. The sensor assembly detects a sensed condition of the environment enclosed by the enclosure. The transmitter communicates the sensed condition to the receiver using near-field magnetic induction. After receiving the sensed condition from the receiver, the communications device communicates the sensed condition to a user.

Abstract: A centrifugal pump has a number of stages, each of the stages having an impeller and a diffuser. The impellers are mounted to the pump drive shaft for rotation. A bearing in at least one of the stages includes a sleeve coupled to the drive shaft for rotation. The sleeve has upper and lower ends and an outer side wall facing radially outward that is convex and spherical. A bushing is mounted in the diffuser and has a bore with an inner side wall facing radially inward that is concave and spherical. A pair of slots is formed in the inner side wall of the bushing 180 degrees apart from each other and extending axially. The slots enable the sleeve to be inserted into the bore with the sleeve axis and bore axis perpendicular to each other, then tilted 90 degrees to coincide the sleeve axis with the bore axis.

Abstract: A submersible pump assembly includes a centrifugal pump driven by a motor. The pump has a number of stages, each of the stages having a diffuser and an impeller. An upthrust washer is located between a diffuser upthrust surface and an impeller upthrust surface. Balance holes extend from an inlet on an upper side of the impeller to an outlet within one of the impeller passages. The upthrust washer overlies the inlets while the impeller is in the upthrust position. Slots are located at an interface between the upthrust washer and the impeller upthrust surface. Each of the slots registers with the inlet of one of the balance holes to allow fluid flow into the inlets of the balance holes while the impeller is in the upthrust position.

Abstract: A method of monitoring an enclosed environment includes disposing a sensor assembly in an environment enclosed by an enclosure, where the sensor assembly includes a transmitter configured to communicate using near-field magnetic induction. A receiver is disposed outside the enclosure and configured to communicate with the transmitter using near-field magnetic induction. The receiver is to a communications device. The sensor assembly detects a sensed condition of the environment enclosed by the enclosure. The transmitter communicates the sensed condition to the receiver using near-field magnetic induction. After receiving the sensed condition from the receiver, the communications device communicates the sensed condition to a user.

Abstract: An electrical submersible pump assembly includes a centrifugal pump having stages. Each of the stages has an impeller in cooperative engagement with a downstream diffuser. The impeller is axially movable relative to the downstream diffuser between a downthrust and an upthrust position. The downstream diffuser has an annular downstream wall surface, relative to the impeller, defining a downstream cavity. The impeller has a downstream balance ring that locates alongside the downstream wall surface. An annular clearance between the downstream balance ring and the downstream wall surface increases in response to the impeller moving from the downthrust to the upthrust position.

Abstract: A method of collecting location data from objects moving within a specified site includes providing at least one tag reader and a plurality of tags each configured to communicate via near-field magnetic induction across an open-air gap of at least two meters. The tag reader listens for a tag signal transmitted by any one or more of the tags. Each tag transmits a tag signal containing a unique identifier that is received at a tag reader. The tag signal is demodulated to determine the unique identifier associated with the particular tag. Also disclosed is a system for monitoring a condition within a shielded environment using a tag and a tag reader that communicate using near-field magnetic induction.

Abstract: A method of collecting location data from objects moving within a specified site includes providing at least one tag reader and a plurality of tags each configured to communicate via near-field magnetic induction across an open-air gap of at least two meters. The tag reader listens for a tag signal transmitted by any one or more of the tags. Each tag transmits a tag signal containing a unique identifier that is received at a tag reader. The tag signal is demodulated to determine the unique identifier associated with the particular tag. Also disclosed is a system for monitoring a condition within a shielded environment using a tag and a tag reader that communicate using near-field magnetic induction.

Abstract: An electrical submersible pump assembly includes a centrifugal pump having stages. Each of the stages has an impeller in cooperative engagement with a downstream diffuser. The impeller is axially movable relative to the downstream diffuser between a downthrust and an upthrust position. The downstream diffuser has an annular downstream wall surface, relative to the impeller, defining a downstream cavity. The impeller has a downstream balance ring that locates alongside the downstream wall surface. An annular clearance between the downstream balance ring and the downstream wall surface increases in response to the impeller moving from the downthrust to the upthrust position.

Abstract: A submersible pump assembly includes a centrifugal pump driven by a motor. The pump has a number of stages, each of the stages having a diffuser and an impeller. An upthrust washer is located between a diffuser upthrust surface and an impeller upthrust surface. Balance holes extend from an inlet on an upper side of the impeller to an outlet within one of the impeller passages. The upthrust washer overlies the inlets while the impeller is in the upthrust position. Slots are located at an interface between the upthrust washer and the impeller upthrust surface. Each of the slots registers with the inlet of one of the balance holes to allow fluid flow into the inlets of the balance holes while the impeller is in the upthrust position.

Abstract: A centrifugal pump has a number of stages, each of the stages having an impeller and a diffuser. The impellers are mounted to the pump drive shaft for rotation. A bearing in at least one of the stages includes a sleeve coupled to the drive shaft for rotation. The sleeve has upper and lower ends and an outer side wall facing radially outward that is convex and spherical. A bushing is mounted in the diffuser and has a bore with an inner side wall facing radially inward that is concave and spherical. A pair of slots is formed in the inner side wall of the bushing 180 degrees apart from each other and extending axially. The slots enable the sleeve to be inserted into the bore with the sleeve axis and bore axis perpendicular to each other, then tilted 90 degrees to coincide the sleeve axis with the bore axis.