Solenoid Diagnostics for Rotary Steerable Systems
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Solution Overview
Problem
Current directional drilling systems, particularly rotary steerable systems, face challenges in accurately predicting the wear and lifespan of downhole components like extendable members, leading to premature replacements and increased costs due to assumptions based on surface conditions rather than actual downhole performance.
Innovation Solution
The implementation of an extendable member diagnostic assembly within the rotary steerable system, which includes sensors and a controller to monitor performance and predict failure, allowing for real-time adjustments and optimal operation extension, reducing unnecessary replacements and extending tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If component replacement is based on surface condition assumptions, then replacement decisions can be made without complex diagnostics, but component lifespan prediction is inaccurate leading to premature replacements
Solution Approach 1:
The patent implements feedback by continuously monitoring solenoid characteristics (current, voltage, impedance) during operation and comparing them against baseline values to detect performance degradation. This feedback loop enables accurate component lifespan prediction without requiring complex external diagnostic equipment, as the system self-monitors its own health parameters.
Solution Approach 2:
The diagnostic system performs self-service by using the solenoid's own operational parameters (current draw, voltage response, impedance changes) as diagnostic indicators. The system monitors its own performance without requiring separate test equipment or external intervention, eliminating the need for complex external diagnostic apparatus while maintaining high prediction accuracy.
2Reliability
If component replacement is performed based on conservative estimates, then reliability is maintained, but operational time is reduced and costs increase
Solution Approach 1:
The system performs preliminary action by detecting early signs of solenoid degradation through continuous monitoring of electrical characteristics. By identifying performance decline before actual failure occurs, the system allows operators to plan replacements optimally - extending operational time up to the point of actual need while maintaining reliability, rather than using conservative fixed-schedule replacements that reduce productivity.
3Measurement precision
If real-time monitoring of solenoid characteristics is implemented, then component health can be accurately assessed, but system complexity and cost increase
Solution Approach 1:
The monitoring system achieves multi-functionality by using the same electrical sensors and control circuitry for both normal solenoid operation and diagnostic monitoring. The existing electrical connections serve dual purposes: powering the solenoid and measuring its characteristics. This eliminates the need for separate dedicated monitoring equipment, maintaining high measurement precision while avoiding increased system complexity.
4Reliability
If downhole component diagnostics are performed, then premature failures are reduced, but the device complexity increases
Solution Approach 1:
The patent extracts the essential diagnostic function from complex external testing equipment and implements it directly within the downhole assembly using simple electrical measurements of solenoid characteristics. By taking out only the necessary monitoring capability and integrating it into the existing control system, the patent achieves accurate failure prediction without adding significant complexity to the downhole device.
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 enables accurate prediction of component performance and health, reducing premature replacements, saving costs, and optimizing drilling operations by dynamically adjusting valve engagement times based on actual downhole conditions.
Implementation Method 1
an actuator coupled to the valve, wherein the actuator selectively actuates the valve to transition the valve between states to control flow of a fluid
Data Source
AI summary
An extendable member diagnostic assembly determines performance of one or more components of a rotary steerable system. Based on the determined performance, an operation can be altered, such as a drilling operation. Performance may be based on measurements received from one or more sensors associated with components of the extendable member diagnostic assembly. For example, performance may be based on the time to transition a valve between states where the valve controls actuation of an extendable member, downhole temperature, downhole pressure or any other factors that affect performance of components that are used to perform the drilling operation. A controller receives the measurements from the one or more sensors and updates baseline parameters to determine an accurate performance. Using real time data to determine performance increases efficiency of an operation by eliminating unnecessary replacement of components and indicating that a downhole tool should be retrieved prior to failure.