Well Screen-Out Detection with Incremental Pump-Rate Control
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Solution Overview
Problem
Hydrocarbon exploration and energy industries face challenges during stimulation or fracturing operations due to screen out conditions that cause rapid pressure increases, potentially damaging equipment and compromising safety.
Innovation Solution
A controller system that monitors fluid pressure and proppant delivery to detect potential screen outs, incrementally adjusting pump and blender rates to stabilize pressure and prevent damage, thereby avoiding rapid pressure increases and equipment stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual control is used to monitor fluid pressure, then operational flexibility is maintained, but detection speed and accuracy of screen out conditions are insufficient
Solution Approach 1:
The patent replaces manual mechanical pressure monitoring with an automated electronic control system that includes pressure sensors, controllers, and computer processors. This substitution enables continuous, high-speed digital measurement and analysis of pressure data, significantly improving detection accuracy and response time while reducing the physical burden on operators.
Solution Approach 2:
The control system is designed to automatically detect screen out conditions, analyze pressure trends, and execute mitigation strategies without requiring constant manual intervention. The system self-monitors fluid pressure, compares it against predetermined thresholds, and autonomously adjusts pump rates or alerts operators, thereby maintaining high measurement precision while reducing operational complexity through automation.
2Productivity
If rapid pressure increases are allowed to occur, then pump discharge rate can be maintained high, but equipment damage and safety risks increase
Solution Approach 1:
The system performs preliminary analysis of pressure trends by continuously monitoring and comparing current pressure readings against historical data and predetermined thresholds. By detecting early signs of screen out conditions before they cause severe damage, the system can proactively reduce pump discharge rates or alert operators, preventing equipment damage while maintaining productivity during normal operation.
Solution Approach 2:
The control system implements continuous feedback loops where pressure sensor data is constantly analyzed and used to automatically adjust pump operations. When pressure increases indicate a screen out condition, the system receives feedback and immediately reduces discharge rate. This closed-loop control maintains high productivity during normal conditions while preventing equipment damage by dynamically responding to changing well conditions.
3Reliability
If pressure relief valves are used to manage pressure, then safety is improved, but energy is wasted through pressure release
Solution Approach 1:
The automated control system performs preliminary detection and response to pressure problems, intervening before pressure relief valves need to activate. By continuously monitoring pressure trends and detecting screen out conditions early, the system can gradually reduce pump discharge rates to prevent dangerous pressure builds, thereby avoiding the need for energy-wasting pressure releases while maintaining wellhead safety.
Solution Approach 2:
The system converts the potentially harmful rapid pressure increases into useful information about well conditions. By analyzing pressure rate-of-change data, the system identifies screen out conditions and adjusts pump operations to maintain optimal pressure, transforming what would be a dangerous event into a controlled process parameter that improves both safety and energy efficiency.
4Loss of information
If frequent manual monitoring of pressure is performed, then operational awareness is improved, but operational time and labor requirements increase
Solution Approach 1:
The control system provides continuous monitoring and analysis of pressure data without interruption, eliminating the need for periodic manual checks. Pressure sensors continuously collect data, the controller continuously analyzes trends, and the system continuously provides alerts or automatic adjustments. This continuous action maintains complete well condition awareness while reducing operational time and labor requirements compared to intermittent manual monitoring.
Solution Approach 2:
The patent replaces manual mechanical pressure monitoring with automated electronic sensors and digital analysis systems. This substitution enables 24/7 continuous monitoring without human intervention, providing constant awareness of well conditions through digital displays and alerts while eliminating the time and physical effort required for manual gauging and interpretation.
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
The system enhances safety and reduces the need for additional operations by accurately detecting pressure changes, preventing wellhead overpressurization, and minimizing equipment stress, thus reducing operational costs and equipment damage.
Implementation Method 1
A fluid pressure of the fluid supplied to the wellhead may be measured and a fluid pressure increase rate of the fluid may be determined from the fluid pressure
Data Source
AI summary
Methods, systems, and controllers for detecting and mitigating well screen outs may include a controller configured to operate a fracturing pump to supply fluid at a discharge rate to a wellhead at a fracturing well site. The controller may also operate a blender positioned to deliver a blend of proppant and fluid to the fracturing pump. The controller may compare a fluid pressure increase rate to a preselected increase rate indicative of a potential well screen out. The controller may incrementally decrease the discharge rate of the fracturing pump and a flow rate of a blender when the fluid pressure increase rate of the wellhead exceeds the preselected increase rate and the fluid pressure is within a preselected percentage of a maximum wellhead pressure until the fluid pressure of the fluid supplied to the wellhead is stabilized.