No Pipe Body Downgrades - Improved Corrosion Mitigation Coating System Provides Significant Operator Savings

2021 ◽  
Author(s):  
Buck Johnson ◽  
Timothy Cappel ◽  
Greg Elliott ◽  
Leianne Sanclemente ◽  
Greg Moore ◽  
...  
Keyword(s):  
Surface Preparation ◽  
Field Trials ◽  
Development Effort ◽  
Coating System ◽  
Preparation Methods ◽  
Coating Application ◽  
Repair Costs ◽  
Testing Field ◽  
Operational Issues ◽  
External Coating

Abstract Objectives/Scope Tubulars used in completion and intervention riser applications are exposed to both the marine environment and corrosive oilfield chemicals, including salt-based completion brines. Eight years of field history from one company shows a loss of $24.3 million from pipe body downgrades due to corrosion and pitting in these salt-based environments. Methods, Procedures, Process This paper documents an extensive development effort spanning over eight years including: research of completion parameters and environments, evaluation of 18 potential external coating/salt neutralization products, multiple lab tests, field trials, as well as testing surface preparation methods, coating application, dry time and adhesion tests. The development of application procedures and construction of an external coating facility are discussed as are rig pipe washing systems and corrosion mitigation procedures. Results, Observations, Conclusions The result is an improved corrosion mitigation coating system. A modified epoxy phenolic internal coating combined with a metallic-based, moisture-cure polyurethane encapsulating external coating. Since 2015, over 1,700,000 feet, 44,000 joints, of completion and intervention tubulars utilizing this system have been deployed with zero pipe body downgrades due to corrosion or pitting, and zero operational issues. In addition to reducing replacement cost and loss of capital, this system provides the ability for longer deployment of the pipe on a multiple well program reducing logistics costs. Novel/Additive Information Extensive research, testing, field trials, and successful field deployments have resulted in an improved corrosion mitigation coating system providing significant savings to operators. Pipe body downgrades due to pitting and corrosion have been eliminated. Improved corrosion resistance has allowed multiple-well deployments reducing shipping, inspection, and repair costs. Ultimately this results in longer life of the tubulars reducing total cost of ownership.

Tar-Polyurethane Joint Coating for the Three-Layer Polyethylene Pipeline Coating

1996 ◽  
Author(s):  
Robert H. Rogers
Keyword(s):  
Cathodic Protection ◽  
Surface Preparation ◽  
Spray Coating ◽  
Field Trials ◽  
Localized Corrosion ◽  
Preparation Technique ◽  
Coating System ◽  
Actual Field ◽  
History Of Use ◽  
Key Steps

This article describes a new joint coating system implemented by Bechtel for a major international, 48 inch diameter gas pipeline. Despite the long history of use as a pipe and valve coating, the new implementation is the industry’s first significant use of a thermoset hot spray coating applied to field weld areas of pipe, mill coated with a three layer polyethylene system. In the laboratory and in field trials, the coating demonstrated integrity, was applied much quicker than the traditional heat shrink sleeve, and eliminated several application contingencies. Laboratory investigations undertaken in Houston, Texas and Lyon, France were key steps in selecting the 100% solids tar-polyurethane coating. Additionally, the testing assisted in developing the surface preparation technique, and demonstrating the coating’s ability to adhere to the polyethylene coating as well as the steel pipe. Serious localized corrosion, and cathodic protection shielding associated with other joint coatings are less probable with the new joint coating system. Actual field cathodic protection testing indicated very low current consumption for the completed pipeline. The efficient joint coating operation contributed to setting new construction records.

Thermal Benefits of Low Solar Absorption Coating for Preventing Rail Buckling

2015 ◽  
Author(s):  
Hao Wang ◽  
Jiaqi Chen ◽  
P. N. Balaguru ◽  
Leith Al-Nazer
Keyword(s):  
Thermal Stresses ◽  
Three Dimensional ◽  
Surface Preparation ◽  
Organic Content ◽  
Coating System ◽  
Solar Absorption ◽  
Coating Application ◽  
Dimensional Finite Element ◽  
Hot Weather ◽  
Three Dimensional Finite Element

A low solar absorption coating for rail application is developed to reduce the peak rail temperature and buckling risk in summer months. The proposed coating system provides a highly reflective surface through white or off-white color and has constituents to provide high abrasion resistance and self-cleaning properties. The zero volatile organic content (VOC) and one hundred percent inorganic coating system has excellent adhesion to steel surfaces with minimal surface preparation. This paper presented the outdoor temperature monitoring results of the coated rail segments under hot weather. The results show that the application of coating could significantly reduce the peak rail temperature up to 10.5°C. Three-dimensional finite element (FE) models were developed to predict temperature distributions and thermal stresses in the rail. The thermal stress simulation shows that, when the rail neutral temperature (RNT) is relatively low, rail coating decreases the compressive stress in the rail up to about 50% during the hottest hours. Although increasing the RNT decreases compressive thermal stresses in the rail, it could increase the risk of rail break due to the increased tensile stresses in the rail. The coating application could reduce the high RNT requirement during rail placement and prevent rail buckling as the effective RNT decreases after traffic and maintenance. Therefore, the low solar absorption coating could serve as a proactive way to control peak temperatures and thermal stresses in the rail.

Recommended Practices For Shop Cleaning And Priming

CORROSION ◽  
1961 ◽  
Vol 17 (8) ◽  
pp. 413t-414t
Author(s):  
◽  
Keyword(s):  
Surface Preparation ◽  
Preparation Methods ◽  
White Metal ◽  
Application Methods ◽  
Recommended Practices ◽  
Methods Of Application

Abstract Recommendations for shop cleaning and priming practices are broken down into seven categories: methods of surface preparation, methods of application, workmanship, supervision, inspection, priming, and fabrication. Surface preparation methods discussed include solvent cleaning, hand cleaning, power tool cleaning, flame cleaning, brush-off blast cleaning, commercial blast cleaning, white metal blast cleaning, and pickling. Application methods considered include brush, spray, hot spray, airless spray, roller, and dip. 5.9.1, 1.7.1, 5.4.7

Evaluation of surface preparation methods for glass

2001 ◽  
Vol 31 (5) ◽  
pp. 362-368 ◽  
Author(s):  
N. P. Mellott ◽  
S. L. Brantley ◽  
J. P. Hamilton ◽  
C. G. Pantano
Keyword(s):  
Surface Preparation ◽  
Preparation Methods

Synthesis of ZrO2 Nanotubes by Anodization of Zr Foil

2015 ◽  
Vol 799-800 ◽  
pp. 125-129
Author(s):  
Mary Donnabelle L. Balela ◽  
April Alexa S. Lagarde ◽  
Stephen Jann A. Tamayo ◽  
Nikko S. Villareal ◽  
Ann Marielle Parreno
Keyword(s):  
Aqueous Solution ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Preparation ◽  
The Other ◽  
Preparation Methods ◽  
X Ray ◽  
Anodization Time ◽  
Other Hand ◽  
Scanning Electron

Zirconia (ZrO2) nanotubes were synthesized by anodization of zirconium (Zr) foil in NH4Fand (NH4)2SO4 aqueous solution. Different surface preparation methods (electropolishing and etching) were applied on the Zr foil prior to anodizaton. In addition, the anodization time and NH4F concentration were varied. The structure and morphologies of the nanotubes and their crystallinity were confirmed using scanning electron microscope and x-ray diffractometer, respectively. ZrO2 nanotubes with large diameters and thick walls were formed at lower NH4F concentration and longer anodization time. On the other hand, smaller nanotubes with thinner walls were produced when the NH4F concentration was increased. The synthesized nanotubes were predominantly tetragonal ZrO2 with small amounts of monoclinic ZrO2.

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