Wellbore String Runnability Index for Downhole Operations
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Solution Overview
Problem
Conventional approaches to determining wellbore string runnability rely primarily on friction factor, which is inadequate for assessing the complex geometrical and mechanical parameters involved in downhole operations, leading to potential operational risks and challenges such as stuck pipes and inefficient drilling.
Innovation Solution
A comprehensive methodology that combines geometrical and mechanical calculations to determine a string runnability index, incorporating parameters like wellbore tortuosity, torsion, curvature, and mechanical forces, using real-time monitoring and physics-based modeling to assess the suitability of a string for running in a wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional friction factor-based approaches are used to assess wellbore string runnability, then the assessment method is simple, but the accuracy and reliability of the assessment is insufficient
Solution Approach 1:
The patent combines multiple assessment dimensions (geometrical parameters including tortuosity and curvature, mechanical parameters including forces and stresses, and operational parameters) into a unified string runnability index. This merging of previously separate assessment factors into a single comprehensive metric resolves the contradiction by providing high accuracy without requiring complex multi-step evaluation procedures.
Solution Approach 2:
The patent transforms the assessment from using a single friction factor parameter to using multiple parameters (tortuosity, curvature, mechanical forces, operational conditions) that are then synthesized into a runnability index. This parameter transformation enables more precise assessment while maintaining ease of use through the standardized index output.
2Reliability
If multiple geometrical and mechanical parameters are considered in string runnability assessment, then the reliability of the assessment improves, but the complexity of the assessment process increases
Solution Approach 1:
The patent changes the state of multiple complex parameters (tortuosity, curvature, mechanical forces, operational parameters) into a unified runnability index with a standardized scale. This transformation maintains high reliability by incorporating all necessary factors while simplifying the output for practical decision-making, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The runnability index provides continuous feedback on string deployment conditions, enabling real-time monitoring and adjustment. This feedback mechanism allows the system to maintain high reliability through comprehensive parameter consideration while keeping the process manageable through actionable, easy-to-interpret index values that guide operational decisions.
3Measurement precision
If real-time monitoring and physics-based modeling are used to determine string runnability, then the accuracy of predicting operational risks improves, but the computational requirements and time consumption increase
Solution Approach 1:
The patent performs preliminary calculations of geometrical parameters (tortuosity, curvature) and mechanical parameters before actual string deployment. By pre-computing these factors and establishing the runnability index in advance, the system achieves high prediction accuracy while reducing the time required during critical deployment operations, thus resolving the contradiction between precision and time consumption.
Data Source
AI summary
In some embodiments, a method comprises quantifying a condition of a wellbore into which a string is to be deployed, wherein quantifying the condition of the wellbore comprises, determining at least one geometrical parameter of the wellbore; and determining at least one mechanical parameter of the string that is caused by deploying the string downhole into the wellbore. The method also comprises determining a string runnability index for running the string into the wellbore based on the quantified condition of the wellbore.