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BlueCoil Technology
 
The next generation of coiled tubing 
BlueCoil™ technology is a new, industry changing technology designed to expand the capabilities of coiled tubing and raise the operational quality and performance to the next level. It is also a technology platform for extending coiled tubing capabilities and reliability to meet future extreme operational demands. BlueCoil™ technology is based on new steel designs and new manufacturing processes to produce coiled tubing that is stronger and more fatigue and environmentally resistant throughout its structure.
The life of a conventional coiled tubing string is normally limited by the fatigue life of its bias welds. As the required yield strength of coiled tubing increases, the fatigue life of the conventional bias weld decreases relative to the rest of the coiled tubing string, limiting the useful life of the entire string to the shorter life of the bias weld. 
In contrast, the bias weld and base tube fatigue performance of a BlueCoil™ string remain comparable for high strength coiled tubing grades, allowing greater utilization of the entire string, bringing additional strength, reliability and longer string life for coiled tubing applications.
BlueCoil™ technology is backed by Tenariss decades of experience and research in pipe manufacturing and metallurgy. BlueCoil™ products have undergone comprehensive testing to validate their advanced metallurgical, mechanical, fatigue and environmental performance. Field experience has confirmed quantifiable benefits of BlueCoil™ products in real-life operations. 
 
 
 
An innovative manufacturing process 
To create BlueCoil™ technology Tenaris developed new steel chemistries and new welding and heat-treatment processes that are exclusive for coiled tubing (patents pending.) They were designed to obtain higher strength grades and provide significant improvements infatigue performance and sulfide stress cracking (SSC) resistance.
Most of the conventional coiled tubing properties are obtained when the flat strips are manufactured at the steel mill. The optimized microstructure and properties of the original flat strip material are later degraded in the bias and seam weld areas.
On the contrary, the final properties of a BlueCoil™ string are obtained at the last stage of the manufacturing process. As a result, there is an improved microstructure and more uniform material properties across the entire string, including the bias and seam welds. 
 
 
 
Great ly Improved general and sour fatigue Performance
BlueCoil™ technology brings improved fatigue performance over conventional coiled tubing grades. This benefit extends to the bias welds, as they have the same improved microstructure as the base tube. In conventional coiled tubing, the shorter fatigue life of the bias weld limits the useful life of the entire string. With BlueCoil™ technology, the fatigue life of the bias weld is similar to that of the base tube.
BlueCoil™ products resist ballooning better than conventional coiled tubing, making them ideal for high-pressure applications.
Extensive testing shows that fatigue performance of BlueCoil™ products after sour (aqueous H2S) exposure is markedly improved when compared to conventional coiled tubing grades. Additionally, fatigue life of conventional coiled tubing grades after sour exposure decreases as the coiled tubings yield strength increases. BlueCoil™ technology enables a more effective and more reliable usage of higher yield strength grades, as the sour fatigue life of BlueCoil™ grades did not show to be adversely affected by yield strength increases. 
With BlueCoil™ technology, the performance of the bias weld in sour fatigue is very similar to the performance of the base tube. The improved and homogeneous microstructure of BlueCoil™ products results in significant sour fatigue improvements for both the base tube and bias welds. In conventional coiled tubing, bias welds typically fail in sour fatigue much sooner than the base tube, even for the lower-strength grades. 
 
 
Significantly Better Sulfide Stress Cracking (SSC) Resistance
BlueCoil™ technology shows improved SSC performance, allowing the use of 20 ksi to 30 ksi higher yield strength grades in SSC environments compared to conventional coiled tubing grades.
Hydrogen induced cracking (HIC) tests show that all the coiled tubing grades, including conventional and BlueCoil™ technology, have good HIC resistance. 
 
Easy to handle
BlueCoil™ products are compatible with the equipment currently used with conventional coiled tubing, so there is no need for special handling or equipment requirements. 
This includes injector handling under high pull load, BHA connectors and BOP shear and slip performance. 
 
Mechanical properties 
 
 
Technical Tables 
 
 
 
 
Full-Scale Yard and Field Performance 
 
 
Conclusions  
New coiled tubing (CT) technology and manufacturing processes were developed using new steel chemistries, manufacturing  and  heat-treatment  processes.  The  resulting  tempered  martensite  microstructure  is  obtained uniformly along  the  entire  CT string,  including  bias  and  seam  welds.    This provides  significant  improvements  over  the  conventional  CT  in  which  less favorable  microstructures of  ferrite,  pearlite and  bainite are  attained and subsequently degraded  in  the  bias-weld and  seam-weld areas.  
Coiled tubing made using the new technology showed significant performance improvements in sour (wet H2S) environments under  static  load  conditions,  i.e.,  better  resistance  to  sulfide  stress  cracking  (SSC) resulting  from  the  improved  material microstructure.  The results imply that the improved SSC performance of the new CT grades could allow the use of a 20 ksi to  30 ksi  higher-yield-strength grades  in  SSC  environments    compared  to  the  conventional  CT  grades.  Hydrogen  induced cracking (HIC) tests showed that all CT grades have good HIC resistance for the sour conditions covered by the tests.  
The new HT-110 grade has on average about 30% longer fatigue life than  the  conventional  HS-110  grade  across  the  whole  range  of  internal  pressures.    The  HT-125  grade  showed  about  90% improved average fatigue life compared to HS-110.