Electric Submersible Pump Motor Length-to-Diameter Ratio
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Solution Overview
Problem
Existing electric submersible pump assemblies for wellbores lack an optimal combination of design features that balance rotational speed, torque, and mechanical stability, leading to inefficiencies in fluid pumping and potential mechanical damage during deployment and operation.
Innovation Solution
The electric submersible pump assembly incorporates a motor assembly with a stator and rotor configuration, including bearing assemblies separated by a length-to-diameter ratio of 7.00 to 13.00, and a module coupler with apertures for enhanced structural integrity and fluid flow management, enabling high-speed operation and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor length is increased to improve torque and power output, then the motor assembly becomes longer and more complex, but this increases mechanical stress and potential instability during deployment
Solution Approach 1:
The patent applies parameter changes by optimizing the length-to-diameter ratio of the rotor to a specific range (7:1 to 13:1). This dimensional parameter optimization allows the rotor to achieve sufficient power output through increased length while maintaining mechanical stability and minimizing excessive complexity. The specific ratio range represents a balanced compromise between power generation capability and structural integrity during deployment.
2Force
If the rotor length is increased to generate higher torque, then more mechanical stress is imposed on bearing assemblies, but this can lead to mechanical failure during operation
Solution Approach 1:
The patent uses parameter changes by defining an optimal length-to-diameter ratio range (7:1 to 13:1) for the rotor. This parameter optimization ensures that the rotor generates sufficient torque while distributing mechanical stress within acceptable limits on the bearing assemblies, thereby maintaining reliability and preventing mechanical failure during operation.
3Productivity
If the pump operates at higher speeds to increase productivity, then fluid pumping efficiency improves, but mechanical stress and operational heat increase
Solution Approach 1:
The patent applies parameter changes by optimizing the rotor's length-to-diameter ratio to enable high-speed operation within a stable mechanical framework. This dimensional optimization allows the pump to achieve higher productivity through increased rotational speed while the optimized geometry helps manage mechanical stress and operational heat generation, preventing excessive temperature rise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the pump's ability to efficiently pump fluids at high speeds while minimizing mechanical stress and operational heat, thereby improving reliability and longevity.
Implementation Method 1
a motor assembly coupled to the pump, the motor assembly including: a housing; a stator disposed within the housing, wherein the stator has an inner surface having a diameter, a rotor disposed in the stator
Implementation Method 2
a first bearing assembly disposed around the rotor; and a second bearing assembly disposed around the rotor
Data Source
AI summary
The disclosure herein includes an electric submersible pump assembly for pumping fluids from a wellbore, which electric submersible pump assembly may include: a pump; and a motor assembly coupled to the pump, the motor assembly including: a housing; a stator disposed within the housing, wherein the stator has an inner surface having a diameter; a rotor disposed in the stator, wherein the rotor has an outer surface and a magnet; a first bearing assembly disposed around the rotor; and a second bearing assembly disposed around the rotor; wherein the rotor has a length separating the first bearing assembly from the second bearing assembly; and the length divided by the diameter of the inner surface of the stator yields a ratio from 7.00 to 13.00.