Systems and methods for downhole power factor correction

摘要

Systems and methods for processing power provided to downhole electrical systems such as electric submersible pump motors to increase the power factor of the supplied power. In one embodiment, a system comprises a downhole motor and a power factor corrector. The motor may be coupled to drive an electric submersible pump. The power factor corrector is configured to receive input power, process the received input power using one or more capacitive electrical components and thereby impart a capacitive phase shift between the voltage and the current of the received input power. The processed output power is provided to the downhole motor, which consumes the processed output power with a power factor which is greater than it would have been in the absence of the correction.

主权项

1. A system comprising:
an electric drive positioned at the surface of a well, wherein the electric drive outputs a first power signal a downhole motor; a power factor corrector coupled to the downhole motor; a power cable coupled between the electric drive and the power factor corrector, wherein the power cable carries the first power signal from the electric drive to the power factor corrector, imparts an inductive phase shift to the first power signal, and provides the phase-shifted first power signal as input power to the power factor corrector, wherein the input power has a first power factor; wherein the power factor corrector is configured to process the received input power using one or more capacitive electrical components and thereby impart a capacitive phase shift between a voltage and a current of the received input power, and provide processed output power to the downhole motor, wherein the processed output power has a second power factor that is greater than the first power factor.