Rigid Centralizer with Embossed Flutes and Welded Posts
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Solution Overview
Problem
Rigid centralizers are heavy, expensive, and require significant space to centralize tubulars within larger holes, making them inefficient for smaller tubulars in larger diameter applications.
Innovation Solution
A rigid centralizer design featuring annular bands with embossed flutes and radially spaced interconnecting posts, manufactured using sheet metal, which allows for a lighter and more cost-effective solution that reduces the radial profile, enabling smaller tubulars to be centralized in larger holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid centralizers are used to centralize tubulars, then reliable standoff and structural strength are achieved, but weight, manufacturing cost, and shipping cost increase significantly
Solution Approach 1:
The centralizer body is segmented into multiple discrete elements including annular bands, spacers, and engagement features distributed around the circumference. These segments are arranged to provide collective structural support and reliable standoff while reducing overall material usage compared to a solid rigid structure
Solution Approach 2:
The centralizer employs composite construction combining different materials with complementary properties - such as combining rigid structural elements with lighter spacing components - to achieve the necessary mechanical strength and standoff reliability while minimizing weight and material cost
2Strength
If rigid centralizers are used to centralize tubulars, then structural strength is maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The centralizer is divided into modular segmented elements that can be manufactured independently using standard fabrication processes, simplifying manufacturing while maintaining overall structural strength through the coordinated arrangement of these segments
Solution Approach 2:
The annular bands and spacers are designed to perform multiple functions simultaneously - providing structural support, maintaining standoff distance, enabling axial spacing between tubulars, and facilitating installation - thereby reducing the number of separate components needed and simplifying the overall device
3Reliability
If rigid centralizers with large diameter are used, then effective centralization is achieved, but the ability to centralize smaller tubulars in larger holes is reduced
Solution Approach 1:
The centralizer incorporates flexible or adjustable elements that allow the structure to adapt its effective diameter to match different tubular sizes, enabling the same centralizer design to effectively centralize various tubular diameters within larger holes while maintaining reliable standoff
Solution Approach 2:
The centralizer design allows for nested or telescoping configurations where inner and outer bands can adjust relative positions, enabling the centralizer to accommodate a range of tubular diameters within a single device structure, thereby improving adaptability across different wellbore and tubular size combinations
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 design provides a lighter, cost-effective, and space-efficient solution for centralizing tubulars, allowing smaller diameters to be inserted into larger holes with reduced shipping costs and increased efficiency, while maintaining effective standoff and flow area.
Implementation Method 1
a plurality of embossed flutes protruding from an outer surface thereof, the plurality of embossed flutes being sized and configured to engage a surrounding tubular or casing
Implementation Method 2
three or more substantially linear interconnecting posts having opposing terminating ends welded to an inner diameter surface of the first and second annular bands
Data Source
AI summary
Embodiments of the disclosure provide a rigid centralizer having at least one annular band with radially extending embossed flutes spaced around an outer surface of the at least one annular band and a plurality of elongated connecting posts welded to an inner surface of the at least one annular band to form a tubular receiving annulus.