... on fatigue life of the resulting slip marks. Upstream Oil & Gas fatigue life reduction Completion Installation and Operations bias weld strength wall thickness Coiled tubing operations resistance quench slip mark hardness society of petroleum engineers intervención de pozos petroleros...

... that the potential problems of using CT in sour service include the reduction of fatigue life available and different forms of H 2 S cracking. Considering this, it was established that the aspects that should be included for qualifying a CT Grade for sour service are: sour fatigue performance for pipe and bias weld...

.... This development led to the creation of the first-ever vacuum chamber of its kind—one that does not entirely enclose the product. The working PVD prototype has been successfully installed at the manufacturing facility in Houston, and test strings coated locally on the bias welds have been created. The paper...

... inventory by gathering samples at multiple locations of stored strings including bias welds and parent tubing from both ends and the center. Additional samples will be located on the bottom of the wrapping (to verify if residual fluids affect coiled tubing storage). These samples will be tested in low cycle...

... new issues and introduced new CT failure mechanisms. The new mechanisms within the industry include: microbiologically influenced corrosion (MIC), premature fatigue failures on bias welds of high-strength grades, and mechanical damage associated with pipe slippages. This paper will compare...

.... This conventional approach results in significantly reduced performance of CT string bias welds. Bias welds are needed to produce a sufficient length of CT strings, as continuous flat steel strips can be produced to only limited lengths, typically between about 1,000 ft to 2,000 ft. Bias welds are applied at 45...

... operations Workplace Hazard Completion Installation and Operations Corrosion Management van arnam oilfield chemistry Upstream Oil & Gas Compatibility Testing Well Intervention Conference specimen inhibitor CG bias weld Exhibition low-cycle fatigue life resistance test result strength...

... Abstract "Pure" fatigue failures (i.e. not started by corrosion or mechanical damage) are not common in coiled tubing strings because of the implementation of systems/models to manage the fatigue life. However, in recent years, a series of "pure" fatigue failures occurred on bias welds of high...

...-well testing. Usable coiled tubing string life, including the life of bias welds, was more than twice the life of a comparable conventional 110-ksi grade coiled tubing string. Upstream Oil & Gas field operation fatigue machine test fatigue life Completion Installation and Operations bias...

... that has been implemented and is now being used by a significant portion of the CT industry. material model Upstream Oil & Gas fatigue model strain range bias weld model diametrical growth fatigue life stress strain range base material model fatigue test point manufacturer life...

... will enable operators to better plan for success with CT well intervention operations. production monitoring Reservoir Surveillance Upstream Oil & Gas Coiled tubing operations production control Completion Installation and Operations bias weld roughness wall thickness chrome completion...

... performance in both the tube body and bias weld. A detailed study of the metallurgical basis of each production step was performed in order to understand the limitations of the current CT technology and manufacturing process. This understanding, coupled with the goal of developing new CT grades that satisfy...

... by the service companies involved. In 2013, for one particular client, a series of failures on the coiled tubing string bias welds was observed, with a root cause due to the presence of sulfate-reducing bacteria (SRB) in the recirculated water. Two different mechanisms were identified as causing the premature...

... party to determine the failure mechanism. Upon inspection, internal corrosion on the base material and preferential corrosion of the bias weld filler material was, in multiple cases, determined to be the cause of failure. It was concluded that microbial induced corrosion (MIC) likely caused localized...

... tubing manufacturing characteristics such as the longitudinal seam, bias welds, and orbital (butt) welds were also considered. From this fit-for-purpose testing, not only was the preferred corrosion-resistant material, Nitronic 19D duplex-steel, selected for the coiled tubing strings, but an operating...

..., there is no other way of observing the damage rendered to the pipe during operation. MFL measurements also bring characteristics such as bias welds into clear resolution. Additionally, metallurgical defects can be identified by an experienced MFL pipe inspector. Furthermore, with the inclusion of coil tubing...

... frequently manifest in bias welds present in certain portions of the coiled tubing string, affecting both fatigue life and potentially operational safety. It has long been understood that higher wall thicknesses improve the fatigue performance of coiled tubing, including bias welds. However, higher wall...

... hot rolled material is erased during welding. In Figure 3 , a crack produced by accumulated damage during service can be observed (CT-110). In this case the crack is associated with coarse grain microstructures in the fusion zone of the bias weld. Abstract Coiled tubing has been traditionally...

... 134,500 140,500 22.5 2.00 0.203 9721832 329810000 140,500 147,000 26.5 2.00 0.203 0320223 348420000 135,500 147,500 29.5 * Yield Strength determined by the 0.2% offset method Bias welds were made and successfully run through the mill. This confirms the bias weld can...

..., such as the effect of different sour environments severities, performance of anti-cracking (H 2 S) inhibitors, effect of pre-fatigue, butt-welds and bias welds performance, and tensile strength integrity. The results have led to changes in the current operating procedures regarding CT strings management and CT...