Abstract: A fluid recovery system is configured to assist with the recovery of hydrocarbons or other fluids from a well. The fluid recovery system includes an electric submersible pumping system, a chemical injection system and an integrated control system. The electric submersible pumping system includes an electric motor, a pump driven by the electric motor and a motor drive configured to control the operation of the electric motor. The electric submersible pumping system includes a signal processing module that is configured to detect a sand slugging event by identifying a sand slugging signature in frequency spectrums derived from the current drawn by the motor from the motor drive. The integrated control system is configured to automatically cause the chemical injection system to increase the injection of treatment chemicals into the well if a sand slugging event is detected.

Abstract: An electrical submersible pump assembly (ESP) has a centrifugal production pump with production pump stages. A gas separator upstream is from the production pump. A centrifugal charge pump is upstream from the gas separator. The charge pump has charge pump stages and a discharge that leads to an intake of the gas separator. Each of the production pump stages has a higher lifting capacity than each of the charge pump stages. The impellers of the production pump stages have vane exit angles greater than vane exit angles of the impellers of the charge pump stages.

Abstract: An electrical submersible pump assembly (ESP) has a centrifugal production pump with production pump stages. A gas separator upstream is from the production pump. A centrifugal charge pump is upstream from the gas separator. The charge pump has charge pump stages and a discharge that leads to an intake of the gas separator. Each of the production pump stages has a higher lifting capacity than each of the charge pump stages. The impellers of the production pump stages have vane exit angles greater than vane exit angles of the impellers of the charge pump stages.