Permanent Magnet Motor Control for Deviated Wellbore Deployment
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Solution Overview
Problem
Existing electric submersible pumping systems with induction motors face deployment challenges in deviated wellbores and limited surface space, and their control algorithms are inflexible, unable to adjust efficiency and power output in the field to accommodate varying loads.
Innovation Solution
A control system for electric submersible pumping systems that includes a permanent magnet motor and a variable speed drive with field-oriented control, allowing for dynamic adjustment of motor operation by loading optimized motor models and monitoring performance metrics like the theta ratio to optimize torque and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If induction motors are used to drive the pump, then the motor can be manufactured with standard designs, but the motor length increases causing deployment problems in deviated wellbores and limited surface space
Solution Approach 1:
The patent changes the fundamental operating parameters of the motor by switching from induction motor technology to permanent magnet synchronous motor technology. This parameter change enables achieving the same power output with a significantly reduced length, solving the deployment problem in deviated wellbores and limited surface space applications.
2Stability of the object's composition
If static vector control algorithms are used, then the control system is simple and stable, but the system cannot adapt to varying load conditions and achieves optimal performance only at constant efficiency or power output
Solution Approach 1:
The patent transforms the static control algorithm into a dynamic adaptive system. The control algorithm continuously monitors motor performance parameters and automatically adjusts control parameters in real-time based on actual operating conditions and load variations, enabling the system to adapt to changing demands while maintaining stability.
Solution Approach 2:
The patent implements a feedback mechanism where the control system continuously monitors motor performance parameters and uses this information to adjust control parameters. This closed-loop feedback enables the system to adapt to varying load conditions and maintain optimal performance across different operating points.
3Device complexity
If the motor operates at constant efficiency, then the control system is simple, but the power output cannot be increased without making the motor longer
Solution Approach 1:
The patent enables dynamic adjustment of motor operating characteristics through adaptive control. The system can operate at different efficiency levels and power outputs by continuously adjusting control parameters based on load conditions, eliminating the need to increase motor length to achieve higher power output.
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
Enables flexible operation of the motor to match changing load conditions, improving efficiency and power output without physical adjustments to the motor, enhancing performance and adaptability in field applications.
Implementation Method 1
the motor is a permanent magnet motor
Implementation Method 2
a variable speed drive with field-oriented control, allowing for dynamic adjustment of motor operation
Data Source
AI summary
A method of operating a pumping system includes an electric motor and a variable speed drive. The method includes the steps of setting a first preference for the operation of the motor, loading a first optimized motor model into the variable speed drive and controlling the motor in accordance with the first preference. The method continues with the steps of monitoring the performance of the motor and setting a second preference for the operation of the motor, wherein the second preference is different from the first preference. The method concludes with the steps of loading a second optimized motor model into the variable speed drive and controlling the motor in accordance with the second preference.