Precision-Cut Tubular for Centralizer Clearance Through Restrictions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bow-spring centralizers used in oilfield tubulars face damage when passing through restrictions with insufficient clearance, reducing their ability to maintain annular standoff, and determining precise clearance sizes is challenging due to outer diameter tolerance variations.
Innovation Solution
A method and system that utilize a thickness sensor and controller to scan and realign the workpiece in a cutting machine, adjusting machining operations to ensure precise cutting of the tubular's outer diameter and maintain structural integrity, allowing for the creation of a centralizer assembly with a turned-down region that accommodates varying diameters and reduces the risk of damage during passage through restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bow-spring centralizers are used to maintain concentricity in wellbores with restrictions, then the centralizer can pass through restrictions by collapsing radially, but the centralizer may be damaged when clearance is too small, reducing its ability to provide standoff
Solution Approach 1:
The centralizer employs flexible ribs that can dynamically adjust their configuration - expanded outward for normal operation to provide standoff, and collapsible radially inward to pass through restrictions. This dynamic adaptability allows the same device to function reliably across varying clearance conditions without damage.
2Ease of manufacture
If outer diameter tolerance for oilfield tubulars is set at 1% to accommodate manufacturing variations, then manufacturing flexibility is improved, but determining precise clearance size becomes challenging
Solution Approach 1:
The system performs preliminary scanning of the tubular outer diameter using sensors before the machining operation. This advance measurement allows the system to determine the actual outer diameter within the 1% tolerance range and pre-calculate the required clearance, enabling precise machining adjustments to be made before cutting begins.
Solution Approach 2:
The system implements feedback control by continuously monitoring the tubular outer diameter during machining and automatically adjusting the cutting parameters. The sensor data feeds back to the controller, which modifies the machining operation in real-time to compensate for variations within the 1% tolerance, ensuring precise clearance determination despite manufacturing variations.
3Manufacturing precision
If a thickness sensor and controller system is implemented to scan and realign the workpiece, then manufacturing precision of the tubular outer diameter is improved, but device complexity increases
Solution Approach 1:
The system replaces traditional mechanical alignment and measurement methods with sensor-based detection and automated controller systems. Instead of manual measurement and alignment procedures, electronic sensors scan the tubular dimensions and the controller automatically adjusts the machining parameters, substituting complex mechanical operations with simpler automated processes.
Data Source
AI summary
A method includes scanning a thickness of a workpiece in at least one point using a thickness sensor, determining that the workpiece is out of alignment in a cutting machine using the thickness sensor, and realigning the workpiece relative to the cutting machine or adjusting a machining operation using a controller of the cutting machine in response to determining that the workpiece is out of alignment.