Radial Expansion System for Wellbore Casing with Variable Yield Points
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Solution Overview
Problem
Current methods for forming and repairing wellbore casings in oil and gas exploration are inefficient, as they require high energy for expansion and do not effectively utilize the material's properties to enhance strength and ductility.
Innovation Solution
A method and system for radially expanding and plastically deforming tubular assemblies within preexisting structures, utilizing steel alloys with specific compositions and yield points to reduce energy consumption and increase collapse strength, by positioning a tubular assembly with varying yield points and expanding it using expansion devices to form a bell-shaped section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional expansion methods are used to form wellbore casings, then the casings can be formed within preexisting structures, but high energy consumption is required for the expansion process
Solution Approach 1:
The tubular assembly incorporates segments with different yield points - a first segment with yield point YP1 and a second segment with yield point YP2 where YP1 > YP2. This local variation in material properties allows the expansion process to proceed in a controlled sequence, reducing overall energy consumption by expanding the lower yield point segment first.
Solution Approach 2:
The tubular assembly is divided into multiple segments with different mechanical properties. The first tubular segment and second tubular segment are joined together to form a composite structure that expands in stages, with each segment contributing differently to the overall expansion behavior and energy requirements.
2Strength
If uniform material properties are used throughout the tubular assembly, then manufacturing is simplified, but the collapse strength and ductility cannot be optimized
Solution Approach 1:
Different segments of the tubular assembly use materials with different yield points to optimize local performance. The segment with the lower yield point (YP2) is designed to expand first and provide ductility, while the segment with the higher yield point (YP1) maintains structural integrity and provides collapse strength, creating a synergistic effect.
Solution Approach 2:
The tubular assembly functions as a composite structure combining materials with different mechanical properties. The interface between the first and second segments is designed to accommodate the differential expansion behavior, creating a composite system that achieves both high strength and high ductility that would not be possible with uniform material properties.
3Strength
If high yield point materials are used throughout the tubular assembly, then collapse strength is increased, but the energy required for expansion increases significantly
Solution Approach 1:
The tubular assembly strategically places high yield point material (first segment with YP1) only in regions where high collapse strength is critical, while using lower yield point material (second segment with YP2) in regions where ductility and ease of expansion are prioritized. This localized material optimization reduces overall expansion energy while maintaining necessary strength.
Solution Approach 2:
The assembly is segmented into functional zones: the first segment provides structural strength and collapse resistance, while the second segment provides ductility and facilitates the expansion process. This segmentation allows the system to achieve high collapse strength without requiring the entire assembly to be made of high-strength, high-energy material.
4Manufacturing precision
If the entire tubular assembly is expanded uniformly, then manufacturing is simpler, but a mono-diameter configuration with constant internal passage cannot be achieved
Solution Approach 1:
The differential yield points create localized expansion behavior where the second segment (lower YP2) expands first and more readily, while the first segment (higher YP1) expands later and to a different degree. This controlled non-uniform expansion allows the formation of a mono-diameter configuration with a constant internal passage through the coordinated interaction of segments with different expansion characteristics.
Solution Approach 2:
The expansion process is dynamic and sequential rather than uniform and simultaneous. The varying yield points create a time-dependent expansion sequence where different segments expand at different rates and to different extents, enabling the formation of complex geometries like mono-diameter configurations with constant internal passages that would be impossible with uniform expansion.
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 method reduces energy required for expansion, increases the collapse strength of the tubular members, and allows for the formation of a mono-diameter tubular assembly with a constant internal passage, enhancing the efficiency and durability of wellbore casings.
Implementation Method 1
radially expanding and plastically deforming the tubular assembly within the preexisting structure
Implementation Method 2
a predetermined portion of the tubular assembly has a lower yield point than another portion of the tubular assembly
Data Source
AI summary
A radial expansion system.