Downhole Motor Voltage-Frequency Control for Lower Power Use
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Solution Overview
Problem
Existing systems struggle to optimize motor power usage in downhole environments due to difficulties in sensor disposition and inefficient control of electrical power, leading to suboptimal torque and speed, which affects hydrocarbon flow rates.
Innovation Solution
A system that includes memory devices and processors to adjust motor operating voltage and frequency systematically, using proportional-integral controllers and optimization techniques to maintain desired rotational speed and efficiency, while monitoring power consumption and compensating for cable voltage drops and asymmetries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electrical power control systems are used in downhole motors, then the system structure is simple, but motor efficiency is suboptimal and power consumption is high
Solution Approach 1:
The system continuously monitors motor electrical data including current signals and voltage signals, calculates estimated rotational speed, and uses this feedback to systematically adjust operating voltage and frequency. This closed-loop control optimizes motor efficiency by adapting electrical parameters to actual motor operating conditions rather than using fixed conventional control.
Solution Approach 2:
The control system dynamically adjusts operating voltage and frequency based on real-time motor performance data. The system performs additional adjustments in a systematic manner to affect the motor to operate at higher efficiency, transforming static electrical parameters into dynamic variables that adapt to changing operational requirements.
2Loss of energy
If voltage and frequency are adjusted to optimize motor efficiency, then power consumption is reduced, but rotational speed control becomes more complex
Solution Approach 1:
The system calculates estimated rotational speed from motor electrical data and uses this feedback to adjust operating frequency in response to changes from voltage adjustments. This ensures rotational speed remains controlled despite dynamic voltage and frequency changes aimed at optimizing efficiency and reducing power consumption.
Solution Approach 2:
The system changes electrical parameters (voltage and frequency) to optimize motor efficiency. By systematically adjusting these parameters and monitoring their effect on rotational speed, the system reduces power consumption while maintaining speed control through coordinated parameter modification rather than independent control.
3Reliability
If operating voltage is increased to compensate for cable voltage drop, then motor receives adequate voltage, but power loss in cable increases
Solution Approach 1:
The system monitors motor electrical data to detect cable voltage drop effects and calculates the necessary compensation. Rather than continuously over-compensating by increasing voltage, the system adjusts operating voltage dynamically based on actual motor needs and cable conditions, reducing unnecessary power loss while ensuring adequate voltage delivery.
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
Enhances motor efficiency and reduces power consumption by optimizing voltage and frequency adjustments, achieving higher operational efficiency and energy savings in downhole motors.
Implementation Method 1
A system is disclosed that includes memory devices and processors to adjust motor operating voltage and frequency systematically, using proportional-integral controllers and optimization techniques to maintain desired rotational speed and efficiency
Data Source
AI summary
Systems and methods provided herein relate to optimization of the motor of a pump system. Voltage-frequency ratios are adjusted while maintaining pumps speed in a systematic manner to lower power usage. Oscillations of the motor speed are detected, and voltage-frequency ratios adjusted to maintain low levels of oscillations while lowering power usage. Savings resulting in the optimization of the pump system are estimated.