Bladder stress reducer cap

摘要

A submersible pump assembly has modules, including a rotary pump, an electrical motor, and a seal section located between the motor and the pump. The seal section has a tubular housing with a lower adapter secured to the housing and joining the seal section with the motor. An upper adapter is secured to the housing and joins the seal section with another one of the modules. An inlet port in the upper adapter admits well fluid into the housing. A tubular, flexible compensator element has an upper end sealed to the upper adapter and a lower end sealed to the lower adapter. A communication passage in the lower adapter admits lubricant from the motor into the compensator element. A cap is mounted around the upper end of the compensator element. The cap has a skirt extending radially outward to limit upward expansion of the compensator element.

主权项

1. A submersible pump assembly, comprising:
a rotary pump; an electrical motor operatively coupled to the pump for driving the pump, the motor being filled with a motor lubricant; a seal section located between the motor and the pump and comprising: an inlet port to admit well fluid in the seal section, and a communication passage that admits the lubricant from the motor into the seal section; a flexible compensator element located in the seal section and separating the lubricant from well fluid entering the seal section, the compensator element having a cylindrical side wall with a compensator neck of reduced diameter at a first end of the compensator element, defining a shoulder extending from the compensator neck to the cylindrical side wall relative to an axis of the shaft; a tube extending through the compensator element; a drive shaft for rotation by the motor extending through the tube; a cap at the first end of the compensator element, the cap having a skirt extending radially outward and overlying the shoulder to limit expansion of the compensator element in a first direction; and wherein the compensator neck is secured to the tube independently of the cap.