Conductive-Fluid Electric Motor With Coated Windings for Mud Telemetry
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Solution Overview
Problem
Electric motors used in conductive fluid environments, such as drilling operations, are prone to short-circuiting due to contact with mud, leading to costly failures and maintenance issues, as existing designs require oil-filled housings that are expensive, fault-prone, and maintenance-intensive.
Innovation Solution
A conductive fluid-immersed electric motor design that allows drilling mud to flow around and through the motor without short-circuiting, using a stepper or hybrid servo motor with nonconductive coatings and a mud-lubricated modulator, eliminating the need for a high-pressure oil-filled housing and gearbox.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electric motor design with oil-filled housing is used, then motor is protected from conductive fluid, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention extracts the harmful conductive fluid from the motor environment by allowing it to flow freely around and through the motor components, while the motor itself remains electrically isolated through non-conductive coatings on critical components, eliminating the need for complex oil-filled housings
Solution Approach 2:
The invention applies non-conductive coatings selectively to specific components (stator, rotor, windings) that are susceptible to short-circuiting, rather than requiring a complete sealed housing system. This localized protection approach reduces overall system complexity while maintaining reliability
2Reliability
If conductive fluid is excluded from motor, then motor reliability improves, but manufacturing cost and maintenance intensity increase
Solution Approach 1:
The invention uses cost-effective non-conductive coatings applied to motor components that can be manufactured and applied through standard industrial processes, replacing the need for expensive custom-designed sealed housings and complex sealing systems
Solution Approach 2:
The invention changes the electrical property parameter of motor components by applying non-conductive coatings, transforming conductive metal surfaces into electrically isolated surfaces, thereby protecting against short-circuiting without requiring complex mechanical sealing structures
3Power
If narrow gap between stator and rotor is used, then motor efficiency improves, but risk of short-circuiting in conductive fluid increases
Solution Approach 1:
The invention maintains the narrow gap for efficiency but applies non-conductive coatings to the stator and rotor surfaces within the gap, creating localized electrical isolation precisely where the short-circuit risk exists, allowing the gap to remain narrow without compromising reliability
4Reliability
If enclosure is added to prevent fluid contact, then motor reliability improves, but device complexity and maintenance increase
Solution Approach 1:
The invention removes the need for enclosing structures by extracting the protection mechanism to the component level through non-conductive coatings, allowing conductive fluid to flow freely while maintaining electrical isolation
Solution Approach 2:
The invention provides protection at the local component level rather than through a global enclosure, applying non-conductive coatings only to the stator, rotor, and windings that require electrical isolation, thereby eliminating complex sealing and enclosure structures
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 design enables reliable operation in conductive fluid environments, reducing operational costs and maintenance by preventing short-circuits, improving torque efficiency, and allowing precise control of pressure waves for telemetry applications.
Implementation Method 1
at least one of the motor stator and motor rotor comprising an electric motor winding and a termination for the winding, the winding and termination having a nonconductive coating
Implementation Method 2
Electrical power to the motor creates a magnetic field that causes the rotor to rotate relative to the stator and generate rotational torque as output
Data Source
AI summary
The present disclosure provides an electrical motor configured to operate with conductive fluids internal to the motor without short-circuiting. One embodiment is a telemetry modulator that can include the electric motor and a valve coupled with the electric motor. The valve has a valve stator and a valve rotor, and the electric motor can be used to control accurately the valve opening and closing with valve rotor rotation. The valve rotor can rotate continuously or in oscillations to generate a continuous pressure wave, such as for MWD/LWD communication. The electric motor is configured to allow drilling mud to flow into the electric motor without short-circuiting by the motor stator and/or motor rotor having an electric motor winding and a termination for the winding, the winding and termination having a nonconductive coating. The electric motor can be used in other applications inside and outside the oil field environment.