Downhole Control Modules for Power Distribution Isolation
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Solution Overview
Problem
In subterranean wellbores, existing power delivery systems suffer from significant power loss and inefficient operation due to leak currents through conducting paths, leading to partial activation of downhole loads, which is undesirable, especially when different loads require varying power levels.
Innovation Solution
The implementation of control modules with thyristors that allow current flow only when a threshold voltage is exceeded, preventing current from flowing to other loads and reducing power loss by isolating current distribution through a system of conducting paths and circuitry, including a gate coupled to a resistor network and a thyristor with a breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single conducting path is used to deliver power to multiple downhole loads, then cable cost is reduced, but power loss increases due to current leakage through unintended loads
Solution Approach 1:
The patent divides the single conducting path into multiple isolated current paths using individual control modules for each load. Each control module contains switching elements (thyristors, triacs, or transistors) that segment the current flow, allowing power to be delivered to only one load at a time while preventing leakage through other loads. This segmentation resolves the power loss issue while maintaining the single cable structure.
Solution Approach 2:
The control module acts as an intermediary between the single conducting path and multiple loads. It contains switching elements that control current flow distribution, preventing direct connection between the conducting path and unintended loads. This intermediary function eliminates power leakage while preserving the single cable architecture.
2Ease of operation
If voltage is applied to one conducting path with another path grounded to power a single load, then independent load operation is achieved, but current flows through leak paths to other loads causing partial operation
Solution Approach 1:
The patent employs dynamic switching elements (thyristors, triacs, or transistors) within control modules that can rapidly change the electrical state of each load connection. These switches dynamically open or close circuit paths based on control signals, enabling precise independent control of each load while preventing unintended current flow. This dynamic control ensures reliable full-power delivery to the selected load without partial operation of other loads.
Solution Approach 2:
The control modules change the electrical parameters (resistance, conductivity) of each load path dynamically. When a load is selected for operation, its path is changed from high resistance (open) to low resistance (closed), while other paths maintain high resistance. This parameter change ensures that current flows only through the intended load, preventing leak paths and ensuring reliable independent operation.
3Reliability
If multiple cables are used to deliver power to each downhole load independently, then power delivery reliability is improved, but system cost increases
Solution Approach 1:
The single multi-conductor cable is designed to serve multiple functions simultaneously - it can deliver power to any of the multiple loads by activating the appropriate control module. The cable structure (with multiple conductors or a sheath) is universally configured to support independent power delivery to multiple loads, replacing the need for separate dedicated cables for each load while maintaining reliable power delivery.
Solution Approach 2:
The patent merges multiple cable functions into a single multi-conductor cable assembly. Instead of using separate cables for each load, multiple conductors or a sheath structure is combined into one cable that can independently power multiple loads through controlled current distribution. This merging reduces cable quantity and installation complexity while maintaining reliable power delivery to each load when needed.
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 solution effectively reduces power loss and ensures that only intended loads receive full power, preventing partial operation of other loads and allowing for precise control of power distribution among various loads in a wellbore, enhancing downhole power availability and reducing issues caused by different resistances in conducting paths.
Implementation Method 1
Each load can be associated with circuitry that responds to a voltage that is above a threshold level by allowing current to flow to the associated load, and that responds by preventing current from flowing to the associated load when the voltage level is below the threshold level
Implementation Method 2
the circuitry responds by preventing current from flowing to the associated load when the voltage level is below the threshold level
Data Source
AI summary
Systems and methods for controlling power distribution among various electrical loads disposed in a bore are described. Control modules that are associated with loads such that each load is associated with at least one control module. Each control module includes circuitry that can respond to a voltage at a level that is above a threshold by allowing current to flow to its associated load, and that can prevent current from flowing to its associated load when a voltage level at another load, instead of the associated load, is above a threshold. The loads and control modules can be located in various zones in the wellbore.