Plunger Lift Controller Adjusts Timing via Feedback
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Solution Overview
Problem
Plunger lift systems in oil and gas wells face challenges in determining optimal close times and afterflow times, as these times can vary significantly and require frequent adjustments due to changing well conditions, making it difficult to maximize production efficiently.
Innovation Solution
A method and controller system that continuously adjust the afterflow and close times based on actual rise times, using a processing unit to calculate adjusted times and optimize operations, ensuring the plunger lift system operates within optimal parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed close times and afterflow times are used in the plunger lift system, then the system operation is simple to control, but the system cannot adapt to changing well conditions and loses production efficiency
Solution Approach 1:
The control system continuously monitors the actual rise time of the plunger and compares it to the target rise time. Based on this feedback, the system automatically adjusts the afterflow time and close time parameters to optimize plunger performance and maintain adaptability to changing well conditions.
Solution Approach 2:
The system transitions from fixed, static timing parameters to dynamic, adjustable parameters. The afterflow time and close time are no longer fixed values but are continuously modified based on real-time plunger performance data, allowing the system to adapt to varying well conditions.
2Productivity
If manual adjustment of close times and afterflow times is performed, then the control logic is simple, but it requires significant operator expertise and time to optimize
Solution Approach 1:
The control system performs self-optimization by automatically calculating and adjusting the afterflow time and close time based on monitored plunger rise times. The system eliminates the need for manual operator intervention to optimize these parameters, as it autonomously adapts to well conditions and maximizes production efficiency.
Solution Approach 2:
The manual adjustment process is replaced with an automated electronic control system. Instead of operators manually calculating and setting timing parameters based on experience, the system uses electronic sensors to monitor plunger rise time and automatically adjusts the timing parameters through a control algorithm.
3Productivity
If the plunger rise time is not monitored and adjusted, then the control system is simpler, but water accumulation increases and production is reduced
Solution Approach 1:
The system implements a feedback loop that monitors the actual plunger rise time and uses this information to adjust the afterflow time. This closed-loop control ensures that water accumulation is minimized and gas production efficiency is maintained by continuously optimizing the plunger cycling parameters based on real-time performance data.
Solution Approach 2:
The system maintains continuous optimization of the plunger lift operation by constantly monitoring rise time and adjusting afterflow time. This continuous adjustment ensures that the system operates at peak efficiency throughout the production cycle, preventing water accumulation and maintaining maximum gas production rather than relying on periodic or manual adjustments.
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 real-time adjustments to optimize the plunger lift system's performance, maximizing production by minimizing water accumulation and adjusting to changing well conditions, thereby enhancing the overall efficiency and longevity of the system.
Implementation Method 1
A plunger lift system uses a freely moving plunger in the production tubing where the plunger forms a seal with the production tubing to prevent fluid from passing between the plunger and the wall of the production tubing
Implementation Method 2
Because the outlet line is typically of a lower pressure than the elevated pressure in the production tubing, the gas with its elevated pressure exits through the open valve and into the outlet line. This causes the plunger to rise in the production well
Implementation Method 3
when there is sufficient pressure behind the plunger, the plunger can be forced by this pressure to the top of the well
Implementation Method 4
using the current afterflow time and a difference between a target rise time and the actual rise time to calculate an adjusted afterflow time
Data Source
AI summary
A method and apparatus for operating a plunger lift system in a well can include: opening a control valve and allowing a plunger to rise to a top of the well; determining an actual rise time of the plunger based on a time it takes the plunger to rise to the top of the well; using actual rise time of the plunger and a target rise time calculating adjustments to the afterflow time or close time; and allowing the afterflow time to pass before closing the control valve and keeping the valve closed for the close time. The methods are repeated, each time calculating a new adjusted afterflow time or adjusted close time to incrementally alter these times.