Casing Wear Volume Determination Using Adjustable Factors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for estimating casing wear in hydrocarbon reservoirs are inaccurate, leading to excessive costs due to overdesigning casing walls and downtime for integrity failures, as they fail to account for the varying effects of side force, friction, and temperature on wear volume.
Innovation Solution
A method that determines tubular wear volume by adjusting wear factors based on side force, friction, and temperature factors, using finite element models and interpolation techniques to provide a more accurate distribution of casing wear volume along the casing string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wear estimation methods are used, then casing wall thickness is increased to ensure safety, but manufacturing costs and device complexity increase
Solution Approach 1:
The patent applies parameter changes by adjusting the wear factor based on multiple variables including side force, friction, temperature, and contact time. This allows the wear estimation to dynamically adapt to actual operating conditions rather than using fixed conservative estimates, thereby optimizing casing wall thickness requirements and reducing manufacturing costs while maintaining reliability
Solution Approach 2:
The patent implements local quality by determining wear factors at specific locations along the casing string where drill string contact occurs. By focusing wear analysis on localized high-wear zones rather than uniformly across the entire casing, the method enables optimized casing design that provides enhanced protection only where needed, reducing overall material usage and cost
2Reliability
If conventional wear estimation methods are used, then safety margins are increased, but manufacturing costs increase
Solution Approach 1:
The patent changes the wear factor parameter from a fixed conservative value to a dynamic value that varies with operating conditions (side force, friction, temperature, contact time). This enables more accurate wear predictions that reduce the need for excessive safety margins, thereby lowering manufacturing costs while maintaining adequate casing integrity
3Reliability
If conventional wear estimation methods are used, then wear volume is overestimated, but casing wall thickness must be increased
Solution Approach 1:
The patent applies parameter changes by making the wear factor a function of multiple variables (side force, friction, temperature, contact time) rather than using a fixed conservative estimate. This dynamic approach produces more accurate wear volume predictions that reflect actual operating conditions, allowing for optimized casing wall thickness that is sufficient for protection but not excessively thick
Solution Approach 2:
The patent segments the wear analysis into multiple discrete locations along the casing string, determining wear factors and contact times at each specific position. This segmented approach allows for precise localization of wear risks and enables optimized casing design that provides adequate protection only where wear is actually predicted to occur, rather than uniformly increasing wall thickness throughout
4Measurement precision
If conventional wear estimation methods are used, then accuracy is insufficient, but downtime for failures increases
Solution Approach 1:
The patent changes the wear estimation from a static calculation to a dynamic model that incorporates multiple varying parameters (side force, friction, temperature, contact time). This improves measurement precision of wear volume predictions, enabling better planning and maintenance scheduling that reduces unexpected failures and associated downtime
Solution Approach 2:
The patent incorporates feedback by using actual operating conditions (side force, friction, temperature, contact time) to continuously update and refine wear factor calculations. This feedback mechanism improves the accuracy of wear predictions over time, allowing for more reliable integrity assessments and reduced unplanned downtime
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 approach allows for precise estimation of casing wear, reducing overdesign, preventing failures, and minimizing costs by optimizing drill string design and operation.
Implementation Method 1
The main cause of such casing wear is the frictional rubbing of other tubular strings on the inner surface of the casing string
Implementation Method 2
internal casing wear... frictional rubbing... potentially reducing the wall thickness
Data Source
AI summary
Tubular wear volume is determined using adjustable wear factors. The wear factors are applied as a function of the side force factor, friction factor, and/or temperature factor. The adjusted wear factors are then used to determine the tubular wear volume.