Inductive Power Coupling for ESP Motor Sealing
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Solution Overview
Problem
Current potheads used in electrical submersible pump systems are prone to damage from torsional, impact, chemical, and environmental factors, leading to fluid ingress and electrical failures, which necessitate the extraction of the entire ESP system.
Innovation Solution
Inductive power coupling provides a sealed and robust method for power transfer to the motor, eliminating fluid ingress and allowing for bolted installation, voltage and current modulation, and filtering of power to enhance reliability and reduce stress on electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional potheads are used for power transfer, then electrical connection is established, but the system is prone to damage from torsional, impact, chemical, and environmental factors leading to fluid ingress
Solution Approach 1:
The patent replaces the mechanical electrical connection system (pothead with physical cable attachment) with an inductive power transfer system using electromagnetic fields. The primary coil assembly in the cable terminus generates a magnetic field that induces current in the secondary coil assembly, eliminating the need for physical penetration or direct electrical contact through the sealed housing, thus preventing fluid ingress while maintaining power transfer capability
Solution Approach 2:
The patent introduces magnetic fields as an intermediary medium to transfer power from the cable terminus to the motor. The primary coil assembly creates a magnetic field that couples with the secondary coil assembly through the sealed housing wall, acting as a non-contact intermediary that transfers energy without requiring physical breach of the seal, thereby protecting against environmental harm
2Ease of operation
If potheads are used for power connection, then electrical power is supplied to the motor, but installation and repair require extraction of the entire ESP system
Solution Approach 1:
The patent divides the power transfer system into separate modular components: a cable terminus with primary coil assembly that can be independently installed on the cable, and a motor with secondary coil assembly that remains sealed. This segmentation allows the cable terminus to be installed or replaced without extracting the entire ESP system, significantly reducing maintenance time and operational disruption
Solution Approach 2:
The patent enables the cable terminus to be easily discarded and replaced when needed for maintenance or upgrades. The modular design allows the terminus to be recovered and replaced as a separate component rather than requiring extraction of the entire ESP system, improving ease of operation and reducing downtime
3Reliability
If inductive power coupling is implemented, then a sealed power transfer mechanism is achieved, but device complexity increases due to coil assemblies and magnetic coupling
Solution Approach 1:
The patent designs the coil assemblies to serve multiple functions: the primary coil assembly not only transfers power but also provides magnetic shielding and structural support for the cable terminus. The secondary coil assembly serves both power reception and as part of the motor's sealed housing structure. This multi-functionality reduces overall system complexity despite the inductive coupling mechanism
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 inductive power coupling significantly reduces pothead-associated failures, increases installation efficiency, and enhances the reliability of ESP systems by providing a sealed power transfer mechanism and filtering capabilities, thus protecting electrical components from harsh downhole conditions.
Implementation Method 1
a primary inductive coil assembly in a sealed housing of a cable terminus... such that an electrical current flowing in the primary inductive coil assembly from the power source and through the power cable is to induce a voltage in the pickup inductive coil assembly
Data Source
AI summary
An electric submersible pump used to pump fluids inside a borehole during operation is described. The electric submersible pump and its motor can be powered using an inductive power coupling. The electric submersible pump comprises a sealed extension that houses a pickup inductive coil assembly that is electrically coupled to a power source at a surface of the borehole. Power runs through the primary inductive coil assembly and the primary inductive coil is positioned relative to the pickup inductive coil assembly such that the electrical current flowing in the primary inductive coil assembly from the power source and through the power cable induces a voltage in the pickup inductive coil assembly.