Electrostatic Separator Phase Angle Control for Variable Oil-Water Streams

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Solution Overview

Problem

Existing electrostatic separators in oil and gas extraction struggle to control the separation process effectively due to unpredictable variations in the stream composition, leading to potential breakthroughs of water in oil or oil in water, necessitating improved methods for controlling electrostatic separators.

Innovation Solution

A method involving the application of time-varying voltage to an electrical separator, detection of phase angle, and adjustment of voltage characteristics to minimize or optimize the phase angle for enhanced separation control, using phase angle sensors and controllers to manage the separation process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If continuous operation with fixed voltage is used, then the separator operates continuously, but control precision deteriorates due to unpredictable stream composition variations

Engineering Contradiction:

Improvecontinuous operationVSAvoidseparation control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies dynamics by transitioning from fixed voltage to time-varying voltage that dynamically adapts to changing stream composition. The voltage characteristics (amplitude, frequency, waveform) are continuously adjusted based on real-time process conditions, allowing the separator to maintain optimal performance despite variable feed composition while operating continuously.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying multiple voltage parameters including amplitude, frequency, and waveform characteristics. These parameter variations enable the separator to respond to composition changes in the feed stream, improving separation control reliability while maintaining continuous operation. The controller adjusts these parameters based on process feedback to optimize separation performance.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If phase angle control is implemented, then separation precision improves, but device complexity increases due to additional sensors and controllers

Engineering Contradiction:

Improveseparation control precisionVSAvoidcontrol system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies feedback by using phase angle sensors to continuously monitor the separation process and feeding this information back to the controller. The controller then adjusts voltage parameters to minimize phase angle deviations, creating a closed-loop control system. This feedback mechanism enables precise separation control while managing complexity through automated control algorithms.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces complex mechanical control mechanisms with electrical and computational systems. Instead of mechanical adjustments, the system uses electronic sensors to detect phase angle and digital controllers to modify voltage parameters. This substitution reduces mechanical complexity while improving control precision through electronic feedback loops.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 approach allows for precise control of the separation process, minimizing phase angle deviations to achieve optimal separation performance and prevent breakthroughs, thereby improving the efficiency and reliability of oil-water separation.

Implementation Method 1

Electric fields are typically employed to speed separation of oil and water. The water typically has some amount of salt that increases its conductivity and its reaction to the effect of an electric field relative to oil.

Methodology Applied

Scientific EffectElectrostatic separation: Electrostatic Induction

Implementation Method 2

detecting a phase angle in the power circuit, and controlling the phase angle by adjusting a characteristic of the time-varying voltage

Methodology Applied

Scientific EffectElectrical conductivity measurement: Conduction (electrical)

Data Source

PatentUS12427441B2Power unit phase angle for separation unit control

Publication Date: 2025.09.30 CAMERSON INT CORP

AI summary

Embodiments described herein provide a method of separating a liquid mixture, comprising providing a liquid mixture to a separator, electrically coupling a power circuit to the liquid mixture inside the separator, applying a time-varying voltage to the power circuit, detecting a phase angle in the power circuit; and controlling the phase angle by adjusting a characteristic of the time-varying voltage.