Adaptive Choke Gain Control for Nonlinear Pressure Drop Stability
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Solution Overview
Problem
Conventional choke controllers fail to effectively account for non-linear behaviors of chokes in fluid pressure management systems, leading to inaccurate control of fluid flow and pressure, often requiring additional equipment and human operators.
Innovation Solution
A controller that uses real-time position and pressure data to determine an adaptive proportional gain coefficient and augmentation correction, allowing for autonomous control of choke actuators to adjust fluid flow and pressure, eliminating the need for extra equipment and human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional choke controllers are used, then the control system is simple, but the control accuracy deteriorates due to inability to account for non-linear behaviors
Solution Approach 1:
The patent applies dynamics by making the proportional gain coefficient adaptive rather than fixed. The controller dynamically adjusts the proportional gain based on the choke position feedback, allowing the control system to adapt to non-linear behaviors at different operating points. This resolves the contradiction by enabling accurate control of non-linear choke behavior through dynamic parameter adjustment without requiring complex additional equipment.
Solution Approach 2:
The patent implements feedback by continuously monitoring the choke position and using this information to adjust the proportional gain coefficient. The feedback loop enables the controller to compensate for non-linear behaviors by adapting its control parameters based on actual system state. This feedback mechanism improves control accuracy while maintaining a relatively simple controller architecture.
2Reliability
If additional equipment is added to handle non-linear behavior, then control accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the choke controller to automatically compensate for non-linear behaviors through adaptive proportional gain adjustment based on position feedback. The system serves itself by using its own position information to adjust its control parameters, eliminating the need for additional external equipment or human intervention. This improves control reliability while maintaining system simplicity.
3Measurement precision
If human operators are used to manage non-linear behavior, then control accuracy improves, but loss of time increases due to manual intervention
Solution Approach 1:
The patent replaces manual human operation with an automated control system that uses adaptive proportional gain adjustment based on position feedback. The controller automatically detects non-linear behaviors and adjusts control parameters in real-time without human intervention. This substitution maintains high control precision while eliminating the time delays associated with manual detection and adjustment.
Data Source
AI summary
A controller and related system and method for controlling a choke for choking fluid flow are configured to take into account non-linear behaviors of the choke, to allow more accurate and effective control of the choke. To obtain a desired pressure drop across a choke valve, the controller is configured to monitor the position of a choke actuator coupled to the choke valve and the pressure at the inlet of the choke valve. The controller calculates an adaptive proportional gain coefficient, and optionally adaptive integral and derivative coefficients, based on the choke actuator position, to help mitigate the effects of non-linear behaviors of the choke and, where necessary, based on the inlet pressure, the controller calculates an augmentation correction to address any instability in the choke. The controller then commands the choke actuator accordingly to adjust the flow area through the choke valve.