Vibration Spectrum Analysis for ESP Gas Lock Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for detecting gas lock in electric submersible pumps (ESPs) are unreliable, often resulting in false positives and failure to indicate impending gas lock until it manifests, leading to overheating and premature pump failure.
Innovation Solution
A vibration-based method that uses sensors to monitor and compare the vibration spectrum of ESP components to known signatures associated with pre-gas lock conditions, allowing for early detection and prevention of gas lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current threshold methods are used to detect gas lock, then the detection method is simple to implement, but the detection reliability is poor and produces false positives
Solution Approach 1:
The patent replaces the electrical current-based detection system with a vibration-based mechanical detection system. Vibration sensors (accelerometers) mounted on the pump assembly detect characteristic vibration patterns that indicate gas lock conditions, providing more reliable detection than electrical current thresholds while maintaining practical implementation complexity.
Solution Approach 2:
The patent introduces vibration analysis as an intermediary detection mechanism between the gas lock condition and the control system. Instead of directly monitoring electrical current changes, the system uses vibration sensors to detect mechanical disturbances caused by gas accumulation, providing more accurate early warning of gas lock conditions.
2Loss of time
If current detection methods are used, then the system responds to gas lock after it manifests, but early detection of impending gas lock is not achieved
Solution Approach 1:
The patent implements preliminary detection of gas lock conditions by monitoring vibration patterns that precede actual gas lock. The system detects changes in vibration characteristics that indicate gas accumulation before it reaches critical levels, allowing operators to take preventive action and avoid complete gas lock, thus reducing downtime and equipment damage.
3Productivity
If gas lock is not detected early, then the pump continues operating, but overheating and premature failure occur
Solution Approach 1:
The patent implements a feedback control system where vibration sensors continuously monitor pump operation and provide real-time information about gas accumulation conditions. When characteristic vibration patterns indicating impending gas lock are detected, the system can trigger alerts or automatic responses to adjust pump operation, preventing the harmful effects of complete gas lock while maintaining productive operation during normal conditions.
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
Enables reliable detection of gas lock onset before it occurs, allowing operators to adjust pump operations and prevent gas lock, thereby reducing downtime and extending pump lifespan.
Implementation Method 1
monitors vibration of the electric submersible pump assembly with a computer processor
Implementation Method 2
The wellbore fluid is rotated within the separator, centrifugally separating heavier wellbore fluid from lighter wellbore fluid
Data Source
AI summary
Vibration of an electric submersible pump assembly is monitored to produce a vibration spectrum. The vibration spectrum is compared to a known vibration signature for a pump condition that precedes gas lock. The pump condition is at least one of an impeller rotating stall condition, a diffuser stall condition, a pre-surge condition, and percentage of free gas within the wellbore fluid. Operation of the pump is then adjusted in response to the similarity of the vibration spectrum to the vibration signature for the pump condition to prevent impending gas lock.