Downhole Power Distribution With Failure-Isolated Load Supplies
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Solution Overview
Problem
Downhole power supply systems face challenges in maintaining voltage stability and reliability due to fluctuations caused by varying load demands and potential failures in downhole electrical systems, which can lead to broader failures among connected loads and power supplies.
Innovation Solution
A downhole power distribution network with multiple load supplies and a network controller that enables semi-independent power delivery to downhole loads, using a network control power supply and load power supplies configured as voltage regulators, along with a communication interface for monitoring and controlling voltage and current levels, and implementing failure isolation to prevent systemic failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single supply cable provides power to all downhole loads, then the system structure is simple, but a failure in any component causes broader failure among other power supplies and loads
Solution Approach 1:
The power distribution system is segmented into multiple independent zones, each with its own supply cable and local distribution network. This segmentation isolates failures to specific zones, preventing cascade failures across the entire system while maintaining overall system reliability.
Solution Approach 2:
The system transitions from a single-cable architecture to a multi-cable architecture with different electrical parameters (voltage levels, current capacities) for different zones. This parameter differentiation enables independent operation and failure isolation of each power supply zone.
2Reliability
If multiple supply cables are used to improve reliability, then failure isolation is enhanced, but the confined wellbore space limits flexibility in main powerline configurations
Solution Approach 1:
Multiple power supply cables and distribution networks are nested within the confined wellbore environment, with each cable routed through available annular space and connected to distributed load zones. This nesting approach maximizes space utilization while maintaining cable independence for failure isolation.
Solution Approach 2:
The power distribution system utilizes the vertical dimension of the wellbore, distributing cables and loads along the depth axis rather than requiring horizontal spacing. This dimensional approach allows multiple independent power lines to coexist in the confined cylindrical space.
3Productivity
If downhole systems are electrically powered and automated, then operational efficiency is improved, but power supply failures can cause broader failure among connected loads
Solution Approach 1:
The automated downhole system is divided into independently powered zones, each with dedicated power supply cables. This segmentation ensures that automation-related power failures in one zone do not propagate to other zones, maintaining overall system reliability while preserving productivity benefits.
Solution Approach 2:
Local distribution networks and control systems act as intermediaries between the main power supply and individual automated loads. These intermediaries provide isolation and protection, preventing failure propagation while enabling efficient automated operation of downhole equipment.
Data Source
AI summary
A downhole power supply and method for supplying downhole power are disclosed. In some embodiments a downhole power supply includes a source power supply including a supply cable coupled to an electric energy source. The downhole power supply further includes at least one downhole distribution network to which the supply cable is configured to couple the electric energy source. The at least one downhole distribution network includes, multiple load supplies providing regulated power levels to multiple downhole loads and a network controller configured to individually connect and disconnect each of the load supplies in response to a failure within the downhole distribution network.