Spinner Wear Detection Using Encoder Feedback
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Solution Overview
Problem
The existing spinner assemblies in iron roughnecks used for subterranean operations suffer from wear issues, leading to reduced performance and increased costs due to premature replacement, as the wear is not accurately monitored, resulting in inefficient threading and unthreading operations.
Innovation Solution
A system comprising a spinner assembly with an encoder and a proximity sensor that counts the teeth of a drive gear to accurately monitor the number of revolutions, allowing for real-time detection of wear and optimizing the operational efficiency by determining the wear status of the spinners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spinners are replaced periodically according to a maintenance plan, then the reliability of the spinner assembly is maintained, but the cost increases due to premature replacement and increased downtime
Solution Approach 1:
The system incorporates an encoder that continuously monitors the rotational position of the drive gear and provides feedback signals to the controller. This real-time feedback enables the system to detect wear conditions based on actual operational data rather than following a predetermined maintenance schedule, allowing spinners to be replaced only when actually needed.
Solution Approach 2:
The patent replaces the traditional mechanical wear detection method (visual inspection or tactile assessment) with an electronic sensing system using an encoder and proximity sensor. This substitution enables precise, automated monitoring of spinner wear through electrical signals, providing more accurate and continuous wear assessment.
2Reliability
If spinners are replaced periodically according to a maintenance plan, then the reliability of the spinner assembly is maintained, but the cost increases due to increased replacement cycles
Solution Approach 1:
The encoder provides continuous feedback on the actual wear state of the spinners, enabling the system to extend replacement intervals beyond conservative maintenance schedules. By basing replacement decisions on actual wear data rather than fixed time intervals, the system reduces the number of replacements and associated costs while maintaining reliability.
Solution Approach 2:
The monitoring system enables the equipment to essentially monitor itself for wear conditions, eliminating the need for manual inspections and allowing the system to determine its own maintenance needs. This self-monitoring capability optimizes the replacement timing to coincide with actual wear thresholds.
3Measurement precision
If the number of revolutions of the tubular is monitored, then the wear status of the spinner can be determined, but the device complexity increases due to addition of encoder and sensor
Solution Approach 1:
The encoder serves multiple functions: it monitors the rotational position of the drive gear, determines the number of revolutions, and provides wear detection data. By making this single component multi-functional, the system achieves precise wear monitoring without proportionally increasing complexity.
Solution Approach 2:
The proximity sensor acts as an intermediary between the mechanical rotation of the gear and the electronic processing system. It converts mechanical position information into electrical signals that the controller can process, enabling wear detection without requiring direct mechanical contact or complex sensing mechanisms.
4Measurement precision
If an encoder is added to count teeth of the drive gear, then the measurement precision of wear detection is improved, but the device complexity increases
Solution Approach 1:
The proximity sensor serves as a non-contact intermediary that detects the position of gear teeth without requiring physical contact or complex mechanical linkages. This approach achieves precise rotational measurement while minimizing the mechanical complexity that would result from contact-based sensing mechanisms.
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 timely maintenance and reduces operational costs by accurately monitoring spinner wear, ensuring efficient threading and unthreading operations and extending the lifespan of spinner components.
Implementation Method 1
a proximity sensor configured to detect teeth of the drive gear as the teeth pass through a sensing field of the proximity sensor
Data Source
AI summary
A system including a spinner assembly that includes a spinner subassembly which includes a spinner configured to engage a tubular, and a drive gear coupled to the spinner, with the drive gear configured to drive rotation of the spinner, and the encoder configured to count teeth of the drive gear as the drive gear rotates. A controller configured to determine a number of revolutions of a tubular that are needed to thread the tubular to a tubular string based on data from the encoder. The controller is also configured to determine when the tubular is unthreaded from the tubular string based on data from the encoder.