Downhole Electrical Conductor Assembly for Signal Transmission
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Solution Overview
Problem
Existing downhole tool string systems face challenges in transparent and efficient transmission of power and data signals across threaded joints, introducing time delays and complexity that increase operational costs.
Innovation Solution
The system employs a tubular body with an electrical conductor assembly featuring a polished mating surface with an electrically conductive portion surrounded by a dielectric material, aligned by stabilizing elements, allowing for secure and efficient transmission of power and data signals through aligned mating surfaces under compressive load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional threaded joints are used for connecting downhole tool strings, then mechanical strength and structural integrity are maintained, but signal transmission transparency and efficiency deteriorate due to time delays and complexity
Solution Approach 1:
An electrical conductor assembly with polished mating surfaces acts as an intermediary component inserted into the threaded joint interface. This conductor assembly provides a dedicated low-impedance pathway for electrical signals to pass through the joint, eliminating the need for signals to traverse the complex mechanical thread structure, thereby reducing transmission time delays while maintaining mechanical connectivity
Solution Approach 2:
The electrical conductor assembly is segmented into multiple conductors (e.g., inner conductor, outer conductor, shield) that can be independently optimized for different signal types (power, data, shielding). This segmentation allows each conductor to be tailored for specific transmission functions, improving overall signal transmission efficiency and reliability across the joint interface
2Adaptability or versatility
If conventional electrical connections are made at threaded joints, then power and data transmission is enabled, but system complexity increases and transparency to operators is reduced
Solution Approach 1:
The electrical conductor assembly merges multiple functions into a single integrated component: mechanical alignment stabilization, electrical signal transmission (power and data), and electrical shielding. By combining these functions into one assembly that interfaces directly with the threaded joint, the system eliminates the need for separate telemetry devices and complex wiring harnesses, thereby reducing overall system complexity while maintaining versatility
Solution Approach 2:
The electrical conductor assembly serves multiple purposes simultaneously: it provides structural support for signal transmission, acts as an electromagnetic shield, enables both power and data communication through its multi-conductor configuration, and facilitates mechanical alignment through stabilizing elements. This multi-functionality reduces the number of separate components needed, simplifying the overall system while maintaining adaptability across different downhole tool applications
3Reliability
If mating surfaces are made electrically conductive for signal transmission, then electrical signal transmission is improved, but debris accumulation and contamination risks increase
Solution Approach 1:
The mating surfaces of the electrical conductor assembly are locally polished to create highly reflective, smooth surfaces that minimize debris accumulation. The polished surfaces reduce the adhesion of contaminants and make it easier for debris to be shaken off or flushed away during assembly/disassembly operations, thereby maintaining electrical contact reliability without completely eliminating contamination risks
Solution Approach 2:
The electrical conductor assembly acts as an intermediary barrier between the external environment and the internal signal transmission pathways. Its shielded construction and enclosed conductor configuration prevent external debris and contaminants from directly contacting the critical electrical contact surfaces, isolating the signal transmission function from harmful environmental factors
4Manufacturing precision
If stabilizing elements are added to align conductor assemblies, then alignment precision and signal transmission quality are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The stabilizing elements create a mechanical equipotential condition by providing reference surfaces and alignment features that ensure consistent positioning of the conductor assembly relative to the threaded joint. By establishing fixed geometric relationships through these stabilizing features, the assembly process becomes more predictable and less sensitive to manufacturing tolerances, effectively reducing the impact of alignment precision requirements on manufacturing complexity
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
This configuration ensures reliable and transparent power and data transmission across downhole tool strings, minimizing time delays and operational costs by maintaining alignment and preventing debris accumulation, while providing a good return path for electrical signals.
Implementation Method 1
The first electrical conductor is in communication with the electrically conductive portion of the mating surface, and may be coupled to the electrically conductive portion by an electrically conductive interface
Implementation Method 2
a first conductor and a second conductor electrically insulated from the first conductor is disposed within the bore of the tubular component
Data Source
AI summary
An apparatus has a downhole tubular body having a bore with a central axis. An electrical conductor assembly is disposed within the bore of the tubular component, the assembly having a first end, a second end, a first conductor, and a second conductor electrically isolated from the first conductor. At least one end of the assembly has a polished mating surface which has an electrically conductive portion surrounded by a dielectric material. The electrically conductive portion is in electrical communication with the first conductor. The first and second ends of the electrical conductor assembly are substantially aligned to the central axis of the bore by stabilizing elements within the bore.