Magnetostrictive Probe Temperature Monitoring in Downhole ESP Motors
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Solution Overview
Problem
Conventional temperature monitoring in downhole ESP systems is limited by the use of single-point thermocouples, which cannot effectively monitor temperatures in inaccessible areas of the motor, leading to potential component failure due to high temperatures and increased maintenance costs.
Innovation Solution
The implementation of magnetostrictive probes with transducers and electronic circuitry to generate and interpret acoustic signals, allowing for temperature measurement at multiple locations within the ESP motor, including between the stator and rotor, and along the motor's length, using ferromagnetic materials capable of withstanding extreme temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermocouples are used for temperature monitoring, then temperature measurement is possible, but only at single accessible points (cannot monitor inaccessible areas)
Solution Approach 1:
The motor is divided into multiple sections along its length, with temperature sensors positioned at different axial locations. Each sensor monitors a specific segment of the motor, enabling comprehensive temperature mapping across the entire motor structure rather than relying on a single measurement point.
Solution Approach 2:
Temperature sensors are nested within the motor structure by positioning them in hollows or recesses formed in the motor housing. This allows sensors to be embedded in inaccessible internal areas without requiring external access, enabling monitoring of temperatures in previously unreachable locations.
2Measurement precision
If fiber optics sensors are used in downhole equipment, then temperature monitoring is possible, but the cost is very high
Solution Approach 1:
The patent replaces expensive fiber optic temperature sensors with more economical temperature sensing elements that can be manufactured at lower cost. These sensors are positioned strategically within the motor structure to provide adequate temperature monitoring coverage without requiring the high-cost fiber optic technology.
Solution Approach 2:
The patent extracts the temperature sensing function from expensive fiber optic systems and implements it using simpler, more cost-effective sensors integrated directly into the motor structure. This separation allows the motor to maintain temperature monitoring capability while significantly reducing sensor costs.
3Measurement precision
If thermocouples are used, then temperature monitoring is possible, but they can only monitor areas near the ends of the motor
Solution Approach 1:
The patent extends temperature monitoring from the traditional two-dimensional surface measurements (near motor ends) into the third dimension by positioning sensors within hollows and recesses in the motor housing. This enables monitoring of temperatures in the internal volume of the motor, providing three-dimensional temperature distribution data.
Solution Approach 2:
Hollows and recesses are pre-formed in the motor housing during manufacturing to accommodate temperature sensors in strategic locations. This preliminary preparation enables sensors to be positioned in inaccessible internal areas before final assembly, expanding the monitored region to include previously unreachable areas.
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 robust, long-term temperature monitoring and distribution mapping in harsh downhole environments, reducing downtime and maintenance costs by providing comprehensive temperature data across complex surfaces and confined spaces.
Implementation Method 1
Each of the magnetostrictive sensors includes a transducer, a probe, and electronic components (e.g., circuitry) coupled to the transducer. The circuitry is configured to generate an initial electrical signal that is conveyed to the transducer. This generates a corresponding initial acoustic signal in the probe.
Data Source
AI summary
Systems and methods for monitoring temperature distribution in downhole equipment using magnetostrictive probes. In one embodiment, an ESP motor has a stator with a rotor and shaft rotatably positioned within the stator. Magnetostrictive sensors are positioned within the motor. Each magnetostrictive sensor has a transducer, a probe, and electronic circuitry coupled to the transducer. The circuitry generates an initial electrical signal that is conveyed to the transducer. The signal passes through one or more coils in the transducer, generating magnetic fields that induce an acoustic signal in the probe. The acoustic signal propagates through the probe and waves are reflected from reflection points in the probe. The transducer senses the reflected acoustic waves and provides corresponding electrical signals to the circuitry, which determines timing intervals associated with the reflected waves and uses this information to determine temperatures at one or more locations in the probe (hence in the monitored equipment).