ESP Motor Cooling Unit for High-Temperature Well Operation
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Solution Overview
Problem
Current ESP systems are not suitable for high temperature applications, particularly geothermal, due to susceptibility to pump cavitation and thermal failures, which limits their operational life and efficiency in environments above 100°C.
Innovation Solution
A cooling device comprising a cylindrical housing with a compressor, condenser, expansion valve, and evaporator, coupled to the ESP system via a magnetic coupling, which uses a working fluid like steam to create a low-temperature heat sink, reducing the internal motor temperature and extending operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ESP systems operate in high temperature environments (above 100°C), then they can access geothermal and heavy oil resources, but thermal failures and pump cavitation occur reducing reliability
Solution Approach 1:
A cooling device is introduced as an intermediary system between the motor and the high-temperature environment. The cooling device includes a heat exchanger that transfers heat from the motor to the surrounding formation, and a fluid circulation system that carries cooling fluid through the motor housing and pump components, thereby protecting these components from thermal damage while allowing operation in high-temperature wells
Solution Approach 2:
The invention changes the thermal parameters of the motor and pump components by actively cooling them. The cooling system maintains the internal components at temperatures below the formation temperature, effectively decoupling the operating temperature of the electrical components from the ambient high-temperature environment, thus preventing thermal failures
2Duration of action of moving object
If motor operating temperature is reduced through cooling, then run life increases by up to 50%, but device complexity increases due to added cooling components
Solution Approach 1:
The cooling device is integrated with the existing ESP system by combining it with the motor housing and pump assembly. The heat exchanger is coupled to the motor, and the fluid circulation system utilizes existing motor components such as the lubrication system, thereby reducing overall system complexity compared to a completely separate cooling system
Solution Approach 2:
The cooling system is designed to be self-regulating where the cooling fluid circulates through the motor and pump components, absorbing heat automatically during operation. The system uses the natural temperature differential between the motor components and the cooling fluid to drive heat transfer without requiring additional control mechanisms
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 cooling device effectively lowers the internal motor temperature, increasing the run life of ESP systems by up to 50% and enhancing their reliability in high-temperature environments.
Implementation Method 1
an evaporator contained within the housing... providing a low temperature heat sink downhole
Implementation Method 2
a compressor... for compressing a refrigerant fluid
Implementation Method 3
a condenser... for condensing the refrigerant fluid to a liquid state
Implementation Method 4
an expansion valve... for expanding the liquid refrigerant
Data Source
AI summary
Cooling devices for use with electric submersible pump motors include a refrigerator attached to the end of the electric submersible pump motor with the evaporator heat exchanger accepting all or a portion of the heat load from the motor. The cooling device can be a self-contained bolt-on unit, so that minimal design changes to existing motors are required.