Wellhead Fatigue Indicator Using Integrated Current Load
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Solution Overview
Problem
Inaccurate estimation of wellhead fatigue damage accumulation in underwater wells due to reliance on surface current speeds, leading to potential overuse or underuse of wellheads.
Innovation Solution
Utilizing integrated current load as a fatigue damage rate indicator, calculated from current profile information across the water column above the wellhead, which characterizes water movement speed and intensity, to determine wellhead fatigue damage rates and inform operational decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface current speeds are used to estimate wellhead fatigue damage, then the estimation process is simple, but the accuracy of fatigue damage accumulation is poor
Solution Approach 1:
The patent transitions from using single-point surface current measurements to integrated current load calculations that account for current profiles throughout the water column. This dimensional expansion from surface-only to full-water-column analysis provides a more comprehensive and accurate assessment of fatigue damage while maintaining computational feasibility through integrated modeling approaches.
Solution Approach 2:
The patent changes the key parameter from surface current speed to integrated current load, which incorporates both current intensity and penetration depth. This parameter transformation enables more accurate fatigue damage estimation by capturing the full spatial distribution of current effects along the wellhead and riser system.
2Reliability
If integrated current load is calculated from current profiles, then wellhead fatigue damage estimation accuracy is improved, but computational complexity increases
Solution Approach 1:
The integrated current load calculation serves multiple functions: it assesses fatigue damage, determines current penetration depth, and provides a comprehensive view of water column current distribution. This multi-functionality justifies the increased computational complexity by delivering multiple critical insights from a single integrated analysis.
Solution Approach 2:
The patent introduces an intermediary modeling approach that translates complex current profile data into an integrated load metric. This intermediary function simplifies the relationship between raw current measurements and fatigue damage assessment, making the system more reliable while managing computational complexity through structured intermediate calculations.
3Measurement precision
If current profile information across the water column is used, then assessment accuracy is improved, but data collection complexity increases
Solution Approach 1:
The patent replaces direct mechanical measurement of current profiles at multiple depths with an integrated modeling approach. By substituting comprehensive physical measurement infrastructure with computational modeling that processes available data into integrated current load metrics, the system achieves high measurement precision without proportionally increasing data collection complexity.
Data Source
AI summary
Current profile of water (e.g., ocean) around a riser connected to a wellhead may be measured and used to determine integrated current load on the riser at any given moment in time. The integrated current load may be used to estimate the wellhead fatigue damage rate at that moment in time. The estimated wellhead fatigue damage rate may be used to make operational decisions for the well.