... ? troilite ? pyrrhotite ? pyrite. With the increase of temperature (80°C~200°C) and time (1~21 days), iron sulfide transformed to more thermodynamically stable phases. 10 However, these tests were performed at a constant H 2 S partial pressure (0.1 bar) and the effect of H 2 S content (pH 2 S...

... variation among the samples analyzed. The polymorphous iron sulfides include pyrrhotite, pyrite, marcasite, troilite, mackinawite and greigite, in the order of abundance. Ferric iron compounds, such as akaganeite, goethite, lepidocrocite, hematite and magnetite are also identified in some samples analyzed...

... evolution. Results of an acid treatment scenario in a hypothetical high H 2 S carbonate reservoir demonstrate that the scales tends to be concentrated in the wormholes. Pyrrhotite and siderite are the most abundant Fe-bearing scales. However, the latter will gradually convert to the former during...

... iron sulfide scale dissolvers (THPS, pH neutralized chelate and traditional chelate), this newly developed iron sulfide dissolver showed significantly better performance on pyrrhotite, calcite and field iron sulfide scales, and much less corrosive at high temperature. Different with the traditional HCl...

... reprecipitation Exhibition permission Houston dissolution texas 77084 pyrrhotite iron sulfide scale dissolver Richardson test result manuscript scale dissolver asphaltene inhibition Publication Division Downhole application corrosivity formulation ABSTRACT Many high temperature sour gas...

... distinct layers. The inner corrosion product was always an iron oxide layer (hypothesized to be Fe3O4), while mackinawite, troilite, pyrrhotite and pyrite were identified as the main components of the outer layer at 80 C, 120 C, 160 C and 200 C, respectively. Pourbaix diagrams generated based...

... place at electrodes of different iron sulfide polymorphs (namely troilite, pyrrhotite and pyrite) in sour aqueous solutions have been studied using electrochemical techniques. Also, the effect of galvanic coupling between different iron sulfides and steel electrodes has been investigated. The results...

... that Pyrite and Pyrrhotite act as cathodic fuels when they are galvanically coupled to steel. Furthermore, the nucleation and growth of FeS in pH 8.40 buffered solution are investigated. It is possible to identify three nucleation species with different nucleation rates, acting at the same time. These species...

... remediation scale remediation Production Chemistry well integrity remediation of hydrates live dissolver Hydrate Remediation hydrate inhibition scale inhibition dissolver Upstream Oil & Gas corrosion rate pyrrhotite texas 77084 wax remediation oilfield chemistry Subsurface Corrosion...

... materials and corrosion upstream oil & gas concentration flowline corrosion riser corrosion corrosion inhibitor co 2 publication division pyrrhotite subsurface corrosion gas pipeline corrosion rate texas 77084 permission passivation film application coupon corrosion product...

... or stable corrosion products in sour environments at elevated temperature up to 250 0 C, which includes mackinawite (FeS), greigite (Fe 3 S 4 ), the pyrrhotite group (Fe1-xS, x = 0 to 0.17) and pyrite (FeS 2 ). The model is based on theoretical thermodynamic calculations and data collection from open...

... materials and corrosion well integrity flowline corrosion subsurface corrosion chemistry concentration texas 77084 pipeline corrosion riser corrosion mackinawite steel co 2 permission artificial intelligence upstream oil & gas publication division carbon steel pyrrhotite...

... & gas chemistry materials and corrosion well integrity concentration pyrrhotite mackinawite texas 77084 flowline corrosion subsurface corrosion fe 2 publication division sulfide manuscript corrosion product reaction solubility iron sulfide elemental sulfur metal surface permission...

... at 25°C, while greigite and pyrite were detected at 60°C. The solubility limits for these iron sulfides were determined. Simplified Pourbaix diagrams for the H 2 S-H 2 O-Fe system have been constructed with different meta-stable and stable iron sulfides (mackinawite, pyrrhotite, greigite and pyrite...

... with a small amount of FeS crystals. After a certain period, pyrrhotite crystals appeared on the surface of the corrosion scale and then the corrosion process was controlled by the growth of pyrrhotite. Key words: high H2S/CO2 partial pressure, corrosion scale, mackinawite, pyrrhotite INTRODUCTION ©2012...

... to be pyrrhotite under conditions that appear similar to these laboratory studies. A review of publications that were able to produce pyrrhotite revealed that pH, temperature and the length of exposure all appear to play a role in the development of the FeS corrosion product. In longer term exposures, there also...

... Pipeline Corrosion well integrity corrosion rate Subsurface Corrosion mill scale materials and corrosion Upstream Oil & Gas steel autoclave flowline corrosion riser corrosion fe deposit pyrrhotite carbon steel iron sulfide deposit corrosion measurement location sand deposit...

... pyrrhotite corrosion product pyrite concentration co 2 greigite iron sulfide troilite steel corrosion partial pressure crystal structure carbon steel Sulfide reaction CORROSION OF CARBON STEEL BY H2S IN CO2 CONTAINING OILFIELD ENVIRONMENTS Stephen N. Smith ExxonMobil Production Company 800...

... siderite scale remediation iron scale thp formulation Production Chemistry field scale 1 dissolution Upstream Oil & Gas mineral concentration low concentration pyrrhotite salt additive formulation ABSTRACT Further work has been undertaken on the continued to develop a novel...

... materials and corrosion riser corrosion oilfield chemistry well integrity flowline corrosion Production Chemistry Upstream Oil & Gas mechanism corrosion product inhibitor Corrosion experience corrosion pyrrhotite Pipeline Corrosion Subsurface Corrosion fe 2 corrosion rate...