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Picture for Evaluation of a Hydrophobic Coating Material for Downhole Application, Lab vs. Field Evaluation
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Evaluation of a Hydrophobic Coating Material for Downhole Application, Lab vs. Field Evaluation

Product Number: 51324-20756-SG
Author: Tao Chen; Feng Liang; Frank Chang; Qiwei Wang
Publication Date: 2024
A hydrophobic electroless nickel-phosphorus (ENP) coating material has been developed to reduce corrosion-induced iron sulfide scale deposition. The ENP coating has several key advantages to provide corrosion resistance for sour oil and gas applications, including a level of phosphorus imparting superior corrosion resistance in a sour gas environment, a tailored phosphorus level providing a range of super hydrophobic microstructures, and a second material introduced and embedded in the ENP coating during the coating process to impart desired properties such as wear and erosion resistance. The coating material has been qualified through a series of evaluation tests carried out in the lab, including iron sulfide scale formation under HTHP, coating adhesion tests, explosive decomposition, formation of heazlewoodite (Ni3S2), etc. The coating material was installed in downhole completion tubing through a downhole corrosion and scale monitoring (DCSM) tool to monitor coating stability, corrosion, and scaling under real downhole flow conditions in a sour gas well over 3 months. Overall, the field testing has demonstrated that this newly developed coating material can effectively protect the metal coupon against corrosion and iron sulfide deposition. However, the abrasion of the formed surface layer of Ni3S2 and blistering might be a concern for a long-term field application. This paper will comprehensively compare the coating performance evaluated in the lab and field conditions. Long-term evaluation under real field conditions is highly recommended to qualify the coating material for large-scale application in the downhole.
	Picture for Evaluation of Various IMM/IC Coating Systems in Terms of Corrosion Protection
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Evaluation of Various IMM/IC Coating Systems in Terms of Corrosion Protection

Product Number: 51324-20414-SG
Author: Daigo Koshiba; Takumi Oshikawa
Publication Date: 2024
In Oil & Gas facilities projects, coating system selection of bulk valves is challenging for EPC contractor to manage because their quantity is extensive and they are installed at each specific situation. IMM (Inert Multi Polymeric Matrix) / IC (Inorganic Copolymer) coatings, hereinafter referred to as IMM, which can be applied under various situations are anticipated to be applied for the bulk valves. Several types of IMM paints have been introduced to the market and corrosion protection performance were evaluated in this paper. Test panels of IMM coatings were prepared from five different manufacture’s brands, with variations in dry film thickness, hereinafter referred as DFT, (125µm/250µm) and with or without heat curing. Corrosion protection performance was tested by salt spray tests (720 hours, 1440 hours) and natural weathering tests (18 month), and evaluated by degree of rust, pull-off tests, and EIS (Electrochemical Impedance Spectroscopy) tests. The results of salt spray tests and natural weathering tests varied depending on each brand's product. The overall trend indicates that panels with a 250µm DFT and without heat curing panels demonstrates better corrosion protection performance rather than panels with a 125µm DFT and with heat curing. In the EIS test, some test panels showed a significant drop in impedance values at low frequency (0.1Hz) with heat curing, which may suggest a degradation in corrosion protection performance. In conclusion, it is recommended to use IMM coatings with a 250µm DFT and to be cautious when applying them at high temperature services.