Well Flow Anomaly Detection Using Temperature Sensors
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Solution Overview
Problem
Shallow gas and oil wells often experience unexpected failures due to freezing, water loading, and mechanical issues, leading to significant production losses and high costs for instrumentation and maintenance, with current methods being either ineffective or economically unfeasible for widespread implementation.
Innovation Solution
A low-cost monitoring system that uses temperature sensors to detect flow anomalies and predict well failures, allowing for targeted intervention and reducing the need for costly and risky methanol injection, and can be retrofitted onto older wells without requiring electrical infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional instrumentation is installed on each well to detect flow anomalies, then measurement precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses inexpensive temperature sensors instead of costly traditional flow meters and instrumentation. These simple sensors can be deployed on many wells without requiring complex installation infrastructure, making the solution economically viable for shallow gas wells with low production values.
Solution Approach 2:
The patent replaces complex mechanical flow measurement systems with a thermal-based detection method. By monitoring temperature changes at the wellhead that indicate flow anomalies, the system achieves reliable detection without mechanical moving parts or complex electronics, reducing both cost and maintenance requirements.
2Reliability
If methanol is injected into wells as a preventive measure against freezing, then reliability is improved, but loss of substance and cost increase
Solution Approach 1:
The system performs preliminary detection of flow anomalies and freeze risks before actual freezing occurs. By identifying wells with diminishing flow rates through temperature monitoring, the system enables targeted preventive actions only when needed, avoiding unnecessary methanol injection and associated costs.
Solution Approach 2:
The system continuously monitors wellhead temperatures and compares them against expected values based on ambient conditions and historical data. This feedback mechanism allows real-time identification of wells requiring attention, enabling precise methanol injection only for wells showing actual freeze risk rather than blanket treatment of all wells.
3Reliability
If field personnel travel to well sites for inspection and methanol injection, then reliability is improved, but loss of time and safety risks increase
Solution Approach 1:
The system enables wells to effectively monitor and report their own status automatically. Temperature sensors at each well continuously detect flow anomalies and transmit data to a central system, allowing wells to self-identify problems without requiring manual inspection. This eliminates the need for personnel to travel to every well site for routine checks.
Solution Approach 2:
The automated monitoring system provides continuous feedback on well status, immediately notifying operators of flow anomalies through electronic alerts. This real-time feedback replaces manual inspection routines, allowing personnel to respond only to actual problems rather than conducting time-consuming routine visits to all wells.
4Reliability
If indiscriminate methanol injection is performed on all wells, then reliability is improved, but cost and environmental impact increase
Solution Approach 1:
The system applies freeze protection measures locally and selectively to only those wells exhibiting flow anomalies or freeze risk, rather than treating all wells uniformly. By using temperature monitoring to identify specific wells needing attention, methanol injection is concentrated where actually needed, reducing overall environmental impact and costs.
Solution Approach 2:
Instead of applying methanol to all wells (excessive action), the system applies it only to the subset of wells showing actual freeze risk (partial action). This targeted approach maintains adequate freeze protection for affected wells while minimizing unnecessary methanol dosing and associated environmental harm to unaffected wells.
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 enables early detection and proactive management of well failures, reducing production losses, lowering costs, and enhancing safety by providing real-time monitoring and notification of well conditions, thereby optimizing production and return on investment.
Implementation Method 1
A low-cost monitoring system that uses temperature sensors to detect flow anomalies
Implementation Method 2
collecting actual flow temperatures and ambient temperatures for establishing a normal flow relationship for flow from the wellhead
Data Source
AI summary
A monitoring tool is provided for monitoring wells for flow anomalies. The temperatures of flowing well fluid and ambient temperature are monitored and various methods applied to indicate if a well is normal flowing, at risk of flow stoppage or cessation of flow. Approaches are described for determining trending indicators from actual flow temperatures compared to a normal flow relationship for establishing the presence of flow anomalies. Temperature sensors, onsite processors and communications upload data for display of well status flags on a mapping module enabling pro-active detection and preventative action by operators.