Curved Traction Surfaces for Wellbore Anchoring
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Solution Overview
Problem
Existing well-related operations that rely on traction to secure devices often create high stress concentrations and corrosion issues in well casings due to sharp features and deformation, which weaken the casing material.
Innovation Solution
An anchoring device with movable anchoring members that transition between contracted and expanded configurations, featuring traction surfaces with gentle curvilinear transitions to engage smooth surfaces, minimizing stress concentrations and promoting corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If sharp features and wedges are used to press into the well casing to establish traction, then the traction force is improved, but the well casing is weakened due to high stress concentrations and deformation
Solution Approach 1:
The patent replaces sharp ridges and angular features with curved, rounded traction surfaces on the anchoring members. The anchoring members feature smooth, contoured surfaces that contact the well casing without creating stress concentrations, thereby maintaining traction while preserving casing integrity
Solution Approach 2:
The patent changes the geometric parameters of the traction surfaces from sharp angles to gentle curves with specific radius of curvature. This parameter modification allows the anchoring members to distribute contact forces over larger areas, reducing stress intensity while maintaining adequate friction for traction
2Force
If very hard materials with sharp features are used to press into the well casing, then the traction is improved, but corrosion is accelerated due to high stress concentrations
Solution Approach 1:
The curved traction surfaces eliminate sharp features that act as corrosion initiation sites. The smooth, rounded contact surfaces distribute stress evenly and do not create the high stress concentrations that accelerate corrosive attack on the well casing
Solution Approach 2:
The patent converts the potentially harmful effect of high contact pressure into a beneficial distributed pressure field through curved surfaces. The same force that provides traction is now distributed to avoid corrosion rather than concentrated to cause it
3Reliability
If anchoring members with sharp features are used to engage the well component, then the anchoring traction is improved, but the well component surface is damaged creating stress concentrations
Solution Approach 1:
The anchoring members are designed with curved, rounded contact surfaces that engage the well component smoothly. This curvature allows the members to bite into the surface for anchoring while distributing the engagement forces to prevent stress concentrations that would compromise component strength
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
The solution provides substantial traction while reducing the impairment to the well component's strength and corrosion resistance, ensuring a smoother, more durable anchoring surface.
Implementation Method 1
Many types of well related operations rely on traction in a wellbore to secure a device at a desired position during the well related operation. One method of establishing traction is through static friction.
Implementation Method 2
Each traction surface is formed to facilitate traction while minimizing stress concentration.
Data Source
AI summary
A technique enables anchoring of a tool in a wellbore. The technique provides traction against a well component without creating high stress concentrations that weaken the well component. An anchoring device comprises anchoring members that are selectively movable to an expanded configuration for anchoring the tool. The anchoring members have traction surfaces able to selectively engage a smooth anchoring surface of the well component at any desired location along the well component. Each traction surface is formed to facilitate traction while minimizing stress concentration.