Patent ID: 8221092

Claim:
An electric submersible pump assembly, comprising: an electrical motor comprising a fluid cavity; a pump operably coupled to the electrical motor; a drive shaft coupled between the electrical motor and the pump; a seal assembly coupled between the electrical motor and the pump, the seal assembly comprising: a housing defining a cavity therein comprising a lower end coupled to the motor and an upper end coupled to the pump, an intake port operably coupled to the cavity and a region outside of the housing, a communication port operably coupled to the fluid cavity of the electrical motor, a lower central passage for receiving one end of the drive shaft, and an upper central passage for receiving another end of the drive shaft; a communication tube having a lower end that is operably coupled to the communication port and an upper end that extends into the housing; a bellows positioned within the cavity of the housing that receives and is fluidicly coupled to the upper end of the communication tube; and lower and upper sealing elements positioned within the lower and upper central passages, respectively, for sealing the interfaces between the lower and upper passages and the drive shaft.