Pressure-Testable Motor Lead Coupling for Long Metal-Sealed Extensions
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Solution Overview
Problem
Conventional motor lead extensions are limited in length due to frictional issues with capillary tubing, preventing the use of longer cables, and taped splice connections are not permitted in certain well applications, necessitating an improved system for connecting and testing motor lead extensions.
Innovation Solution
A motor lead coupler system that securely connects upper and lower motor lead extensions using a body with receivers and intermediate terminals, forming a metal-to-metal seal by exposing conductors and using compression nuts and ferrules, and allows for pressure testing to ensure leak resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional capillary tubing is used to protect motor lead extensions, then the cable can be protected from damage, but the maximum length of the motor lead extension is limited due to frictional interface between the insulated conductor and the capillary tubing
Solution Approach 1:
The motor lead extension system is divided into multiple segments (first motor lead extension and second motor lead extension) that can be connected together. Each segment can be individually protected with capillary tubing, and the segmentation allows the overall system to exceed the length limitations of a single continuous capillary tube by using multiple shorter protected sections.
Solution Approach 2:
A motor lead coupler serves as an intermediary device between the first and second motor lead extensions. The coupler includes a body with receivers that accept the insulated conductors from both extensions and provide electrical connection through intermediate terminals, enabling the combination of multiple segments into a functional extended assembly.
2Length of stationary object
If two motor lead extensions are spliced together using overlapping layers of tape to achieve longer cable length, then the maximum length limitation is overcome, but the connection is not permitted in certain well applications particularly where the splice would be located beneath a packer or other zonal isolation device
Solution Approach 1:
The system uses discrete, pre-fabricated motor lead extension segments with defined connection points. Rather than creating field splices with tape, each segment is a complete, factory-assembled unit with protected conductors, ensuring that connections are made at designated interfaces (through the motor lead coupler) rather than through unauthorized tape splices.
Solution Approach 2:
The invention changes the connection method from chemical/adhesive-based (tape) to mechanical/electrical-based (receivers and intermediate terminals with compression nuts). This parameter change in the connection mechanism provides a more reliable, reversible, and controllable connection that meets the stringent requirements of zonal isolation applications.
3Reliability
If a secure, leak-resistant connection is made between motor lead extensions, then connection reliability is improved, but the device complexity increases due to the need for receivers, intermediate terminals, compression nuts, and ferrules
Solution Approach 1:
The coupler assembly is segmented into distinct functional components (body with receivers, intermediate terminals, compression nuts, ferrules) that can be independently manufactured, quality-tested, and assembled. This segmentation allows each component to be optimized for its specific function while maintaining overall system reliability through standardized interfaces and assembly procedures.
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 longer motor lead extensions with secure, leak-resistant connections, overcoming length limitations and eliminating the need for taped splices, particularly in areas with zonal isolation devices.
Implementation Method 1
placing a metal compression nut over the metal tube of each lead, and placing a metal ferrule over the metal tube of each lead such that the ferrule is between the compression nut and the conductor tip
Data Source
AI summary
A motor lead coupler is configured to provide a metal-to-metal sealed connection between a first motor lead extension and a second motor lead extension. The motor lead coupler includes a first plurality of receivers on a first end of the body, a second plurality of receivers on a second end of the body, and a plurality of intermediate terminals. Each of the first plurality of receivers is configured to receive a corresponding one of the first plurality of leads, and each of the second plurality of receivers is configured to receive a corresponding one of the second plurality of leads. Each of the intermediate terminals is connected between a corresponding pair of the first plurality of receivers and the second plurality of receivers. The motor lead coupler includes pressure test ports that can be used to pressure test the connection between individual leads and the motor lead coupler.