Closed-Loop Pump-Off Detection for Wireline Tool Placement
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Solution Overview
Problem
Pump-down operations in oilfield operations face challenges with increased downhole tension leading to wireline damage or 'pump-off' events, where tools separate from the wireline, causing costly and time-consuming remediation, especially in horizontal wellbores where tension spikes occur rapidly.
Innovation Solution
Implementing a closed-loop control system that simultaneously manages wireline speed and pump rate using sensors and computing devices to predict and prevent pump-off events by adjusting the winch and pump operations, thereby maintaining optimal tension and avoiding tool separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pump-down operations are performed to convey tools to desired depth, then tool placement is achieved, but tension spikes occur causing wireline damage or pump-off events
Solution Approach 1:
The system performs preliminary detection of pump-off conditions by monitoring tension, flow rate, and line speed parameters before actual pump-off occurs. The prediction module anticipates pump-off events and triggers preventive actions (adjusting line speed or pump rate) to avoid wireline damage and tool separation, thereby maintaining both productivity and reliability
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring downhole tension, pump flow rate, and line speed, comparing actual values with target values, and automatically adjusting operations to maintain optimal parameters. This feedback mechanism prevents tension spikes that could damage wireline or cause pump-off events
2Ease of operation
If manual monitoring of tension is performed, then operator control is maintained, but response time is insufficient to avert pump-off events
Solution Approach 1:
The system performs self-service by automatically detecting pump-off conditions and executing corrective actions without human intervention. The prediction module and control system work autonomously to monitor parameters, predict pump-off events, and adjust line speed or pump rate, eliminating the response time delay inherent in manual monitoring while maintaining operational control
Solution Approach 2:
The system replaces manual mechanical monitoring with an automated electronic control system that uses sensors, processors, and communication modules to detect and respond to pump-off conditions in real-time, significantly reducing response time from seconds to milliseconds
3Productivity
If pump rate is increased to speed up tool conveyance, then productivity improves, but tension increases leading to pump-off events
Solution Approach 1:
The system dynamically adjusts pump rate and line speed based on real-time downhole conditions. When approaching horizontal sections or detecting increasing tension, the system automatically reduces pump rate or increases line speed to maintain optimal tension levels, preventing pump-off events while maximizing overall conveyance efficiency
Solution Approach 2:
The system changes operational parameters (pump rate, line speed) in response to detected conditions. The control module adjusts these parameters to maintain tension within safe limits during tool conveyance, balancing productivity improvements with prevention of excessive tension that causes pump-off events
Data Source
AI summary
Pump-off detection, and actions to avert a pump-off event from occurring, are described that may be implemented in a wireline control system while performing a pump-down operation to position a downhole tool within a wellbore. As part of the pump-down operation, the downhole tool is attached to a wireline coupling the tool to a wireline control device located at the surface above the wellbore.