Shear pin and drive shaft spring brake in electrical submersible pump
AssigneeBaker Hughes Oilfield Operations LLC
InventorsRandal Perisho, Zheng Ye
Life of this patent
Estimating the term…
Abstract
An electrical submersible well pump assembly (ESP) has a spring brake having helical turns mounted between the shaft and one of the housings. The spring brake allows free rotation of the shaft in a driving direction and stops the shaft from rotating in a reverse direction. The spring brake may have one end be affixed to the housing to rotate in unison in both directions. Alternately, the spring brake may have one end affixed to the shaft for rotation with the shaft. Further, the spring brake could be free of being connected to either the shaft or the housing. A shear member may be mounted between the shaft and the housing to prevent any rotation of the shaft during run-in.
Claims20
An electrical submersible well pump assembly (ESP), comprising:
- a pump;
- an electrical motor;
- a bore within the motor and the pump;
- a rotatable shaft assembly extending through the bore from the motor into the pump for driving the pump;
- a spring brake having helical turns, the spring brake being free of attachment to a sidewall of the bore and to the shaft assembly;
- and
- means for configuring and mounting the spring brake between the shaft assembly and the sidewall of the bore so as to allow free rotation of the shaft assembly in a driving direction and stop the shaft assembly from rotating in a reverse direction.
An electrical submersible well pump assembly (ESP), comprising:
- a pump,
- an electrical motor;
- a bore within the motor and the pump;
- a rotatable shaft assembly extending through the bore from the motor into the pump for driving the pump;
- a spring brake having helical turns and surrounding the shaft assembly in the bore;
- a first portion of the helical turns being closely spaced to the shaft assembly;
- a second portion of the helical turns being closely spaced to the sidewall of the hub;
- wherein the helical turns in the first and second portions are wound to allow driving direction rotation of the shaft assembly;
- and wherein
- commencing reverse rotation of the shaft assembly causes the first and second portions to move radially to grip the shaft assembly and the sidewall of the bore to prevent further reverse rotation of the shaft assembly.
An electrical submersible well pump assembly (ESP), comprising:
- a pump;
- an electrical motor;
- a bore within the motor and the pump;
- a rotatable shaft assembly extending through the bore from the motor into the pump for driving the pump;
- a shear member extending between the shaft assembly and the sidewall of the bore, the shear member preventing rotation of the shaft assembly in any direction while the ESP is being lowered into the well and being configured to shear when power is supplied to the motor, allowing the shaft assembly to rotate;
- a spring brake having helical turns and surrounding the shaft assembly in the bore;
- a first portion of the helical turns being in proximity to the shaft assembly;
- a second portion of the helical turns being in proximity to the sidewall of the bore;
- wherein
- the helical turns in the first and second portions are wound to allow driving direction rotation of the shaft assembly;
- and
- commencing reverse rotation of the shaft assembly causes the first and second portions to move radially to grip the shaft assembly and the sidewall of the bore to prevent further reverse rotation of the shaft assembly.
Dependencies are inferred from the claim text.