Downhole Thermal Flow Sensor for Harsh-Environment Measurement
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Solution Overview
Problem
Conventional fluid flow rate sensors are unreliable and have a shortened service life due to harsh downhole environments, making it difficult to accurately determine the flow rates of fluids such as hydrocarbons, gas, and salt water.
Innovation Solution
A novel fluid flow rate sensor comprising an elongated structure with a heater element and temperature transducers, which uses thermal properties to infer fluid flow rates by analyzing temperature changes, providing robust performance in hostile environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluid flow rate sensors are used in downhole environments, then fluid flow rate measurement is achieved, but the sensors become unreliable and have shortened service life due to harsh physical stress
Solution Approach 1:
The patent replaces conventional mechanical fluid flow rate sensors with a thermal-based measurement system. A heater element heats the elongated structure, and temperature transducers measure temperature changes caused by fluid flow. This substitution eliminates mechanical moving parts that are susceptible to harsh downhole conditions, thereby improving reliability and extending service life while maintaining measurement capability
Solution Approach 2:
The invention changes the measurement parameter from mechanical detection to thermal detection. By monitoring temperature changes in the elongated structure caused by fluid flow heat transfer, the system achieves flow rate measurement without mechanical components. This parameter change makes the system more reliable in harsh environments where mechanical sensors fail
2Measurement precision
If conventional fluid flow rate sensors are deployed in harsh downhole environments, then fluid flow rate data is obtained, but the sensors are physically stressed and measurements become inaccurate
Solution Approach 1:
The patent replaces mechanical flow sensors with a thermal measurement system that uses a heater element and temperature transducers. This substitution eliminates the physical stress and mechanical failure modes that affect conventional sensors in harsh downhole environments, maintaining measurement precision while reducing vulnerability to environmental harmful factors
Solution Approach 2:
The elongated structure acts as an intermediary between the heater element and the fluid. The heater heats the structure, and the flowing fluid carries heat away from the structure. Temperature transducers mounted on the structure indirectly measure fluid flow through thermal coupling, isolating the sensing elements from direct exposure to harsh fluid 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
The sensor offers reliable and long-lasting fluid flow rate measurements in downhole and surface pipe environments, capable of handling diverse fluid types and conditions.
Implementation Method 1
a heater element installed into a first end of the elongated structure
Implementation Method 2
analyzing the first temperature indication over time in combination with the second temperature indication over time, based on known thermal properties of the elongated structure
Data Source
AI summary
A fluid flow rate sensor. The fluid flow rate sensor comprises an elongated structure; a heating element installed into a first end of the elongated structure; a first temperature transducer coupled to an outside of the elongated structure at a first predefined location; a second temperature transducer coupled to the outside of the elongated structure at a second predefined location; and a control unit that is configured to turn the heating element on and off, to analyze a first temperature indication received from the first temperature transducer, to analyze a second temperature indication received from the second temperature transducer, to determine a flow rate of a fluid that is in intimate contact with the outside of the elongated structure based on analyzing the first temperature indication and the second temperature indication, and to output the flow rate via a communication line.