Coiled Tubing Heat Treatment Uniformity via Feed-Forward Control
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Solution Overview
Problem
Existing methods for manufacturing coiled tubing fail to produce uniform mechanical properties along its length due to variations in wall thickness, steel chemistry, and processing conditions, leading to non-uniform stress concentrations and potential failure.
Innovation Solution
A method and system utilizing a feed forward control loop for continuous heat treatment of coiled tubing, where the tube is unspooled, heat treated, and re-spooled through multiple heating and cooling stations, with power levels adjusted based on real-time measurements of tube geometry, chemistry, and speed to achieve uniform mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional heat treatment methods are used with a single furnace, then the equipment complexity is low, but the manufacturing precision of mechanical properties deteriorates due to non-uniform heating and slow response to material variations
Solution Approach 1:
The heat treatment system is divided into multiple independent heating zones (first heating zone, second heating zone, third heating zone) along the tube processing line. Each zone has its own heating elements and control system, allowing independent temperature regulation. This segmentation enables different sections of the tube to receive customized heat treatment parameters, achieving uniform mechanical properties throughout the entire tube length while managing complexity through modular design.
Solution Approach 2:
The system dynamically adjusts heating parameters based on real-time measurements. Sensors detect tube wall thickness, material composition, and temperature at various points, and the control system continuously modifies heating power and duration for each zone. This dynamic adaptation ensures optimal heat treatment for varying material conditions, producing consistent mechanical properties despite variations in input material.
2Manufacturing precision
If the furnace temperature is kept constant, then the operation is simple, but the manufacturing precision deteriorates when wall thickness or chemistry changes cause temperature variations
Solution Approach 1:
Temperature sensors are positioned throughout the heating zones to continuously monitor tube temperature. The control system receives this feedback and automatically adjusts heating element power to maintain target temperatures. When material variations cause temperature deviations, the feedback loop detects them and corrects them in real-time, ensuring precise temperature control without requiring manual intervention or complex operational procedures.
Solution Approach 2:
The system replaces manual temperature control mechanisms with automated electronic control. Computers and microprocessors calculate optimal heating parameters based on sensor data and material specifications, then automatically adjust heating element power. This substitution of mechanical/manual control with electronic automation achieves superior temperature precision while maintaining ease of operation through automated decision-making algorithms.
3Manufacturing precision
If multi-stage heat treatment is implemented, then the manufacturing precision of mechanical properties is improved, but the productivity decreases due to multiple processing stations
Solution Approach 1:
The tube moves continuously through all three heating zones in a single uninterrupted pass. Each zone performs its heat treatment function simultaneously as the tube progresses, rather than requiring separate batch processing steps. This continuous multi-zone approach achieves the mechanical property uniformity of multi-stage treatment while maintaining high production speed, as the tube is treated in all zones during one continuous operation rather than requiring multiple discrete processing events.
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 ensures uniform mechanical properties along the length of the coiled tubing, reducing stress concentrations and improving reliability by precisely controlling temperature and heating processes, thereby enhancing the tube's performance and longevity.
Implementation Method 1
a first heat treatment zone therebetween, the first heat treatment zone comprising at least one first zone heating element
Implementation Method 2
heating the portion of the tube to the first heat treatment target value
Data Source
AI summary
A system includes a feeder configured to feed a continuous length of a tube at a predefined rate, a speed sensor configured to determine a feed rate of the continuous length of the tube, a first geometry sensor configured to determine one or more geometric dimensions of a portion of the continuous length of the tube, a first treatment station comprising a first entrance, a first exit, and a first heat treatment zone therebetween, the first heat treatment zone comprising at least one first zone heating element, and a controller configured to power the first zone heating element at a first heat treatment power level based on a first heat treatment target value, the feed rate, one or more of the geometric dimensions, and a first heating element value of the first zone heating element. The system may also include additional heat treatment and cooling stations.