... components. To date the majority of the research work has been conducted to characterize the pitting susceptibility of CrMn-stainless steels under static conditions. Little attention, however, has been paid to the effect of shear stresses introduced by the flow of the drilling fluid on the pitting resistance...

... efforts have focused on the topic of sour corrosion mechanisms, while minimal attention has been paid to ascertaining the mechanical properties of the iron sulfide layers developed in these environments. The effects of fluid flow (i.e. erosion/corrosion, wall shear stress) as well as the impact...

... with the biocide was critical. corrosion inhibitor preferential weld corrosion shear stress INTRODUCTION The transport of oil and gas in different environments, presents an enormous challenge especially in terms of corrosion resistance. The mitigation of internal corrosion in steel pipelines can be achieved...

... performed using two different flow rotational speeds and lasted five days. SEM, EDS and XRD analyses of specimen surface after exposure provided corrosion product characterization. The experimental results clearly indicated an existence of a critical shear stress, above which FeCO₃ could...

...Ultrasound abiotic biotic fouling monitor deposit thickness fouling Factors U-coefficient heat transfer coefficient shear stress Reynolds Number in situ ex situ deposition optical coherence tomography INTRODUCTION One of the main causes of performance loss, quality...

... materials of the DSEs and the barrels; and provide recommendations to prevent similar failure. The fracture occurred at a weak portion of the DSE A as a result of a frictional stress (shear stress) due to excessive adhesive wear between the hardfacings of DSE A and the corresponding barrel A. The weak...

... of the high wall shear stress that can be generated. Results show that mechanical forces in this multiphase flow regime as described by the high levels of turbulence and wall shear stress did not have a detrimental effect on the performance of the corrosion inhibitors used in this study. However...

... offer excellent corrosion protection and are suitable for use in high shear environments. Brief details of the UK and Norwegian environmental regulations are also given. shear stress jet impingement green corrosion inhibitors INTRODUCTION In oil and gas production the downhole tubing, pipelines...

...Abstract Chemical corrosion inhibition of steel in CO₂ and/or H₂S environments under high flow rates, hence high shear stresses, has long been a puzzle from an mechanistic point of view. Certain misconceptions had to be removed first before progress could be made. It had been...

...CFD SIMULATION Two different sets of CFD simulations were performed on the test cell, representing two different experimental layout of the test specimen, with obstacles and without obstacles. For each set, shear stress estimates were obtained as a function of specimen rotational velocities...

... solution was a 9:1 mixture of D.I. water and light hydrocarbon oil. The results show the corrosion rate (CR) varies with temperature as shown in Figure 1 . The shear stress at 1500 rpm was calculated to be in the order of 68 Pascals. The coupons used were L–80–10 steel. The data shows a CR of 100 mpy...

... are conducted using rotating cylinder electrode (RCE) tests under moderate shear stress and limited test conditions. ^{12 , 13} The chemicals that perform well, providing protection against corrosion in these initial screening tests, undergo final evaluations in high temperature and high pressure...

... conditions. The complex problem of translating laboratory flow (high speed autoclave test) to field conditions was attempted empirically using established correlation for the rotating cylinder and tubular flow. target corrosion rate effective inhibitor concentration shear stress high speed autoclave test...

... the performance of the foulant clean up will also be discussed. heterogenetic biofilm fouling factors recovery time underdeposit corrosion pitting biovolume deposit weight density surfactant enzyme biocide biodispersant shear stress surface roughness adhesion TABLE 5 COOLING WATER BACTERIAL...

.... At a fixed slug frequency, the corrosion rates have been found to increase with an increase in Froude number, carbon dioxide partial pressure, and temperature. Corrosion inclined multiphase flow slug flow phase distribution bubble impact shear stress oil water composition large diameter pipelines...

... The shear stress in the actual tubing for downhole wells was chosen as 186.8 g/cm-sec² (0.39 lb_f/ft²). This shear stress was chosen based on shear stresses calculated for vertical sections in 12 different wells. This shear stress was produced by a turbulent flow...

...Abstract Corrosion tests using a flow loop and rotating cylinder electrode are used to select corrosion inhibitors for downhole and flowline application. The results show tests incorporating high flow rates and high shear stress levels will differentiate the performance of different inhibitor...

.... cohesion adhesion shielding (of cathodic protection current) cathodic disbondment moisture absorption microbiologically influenced corrosion (MIC) shear stress plastic deformation cohesive separation electroendosmosis sulfate reducing bacteria facultative ability hydrogen overvoltage potential...

...Efird et al. ³ (1993) showed that, for full pipe flow, the corrosion rate can be expressed in terms of wall shear stress. Further, they showed that corrosion measurements from rotating cylinder electrodes were much lower than those obtained from pipe flow. The study of fast moving slugs...

... partitioning, and compatibility. flow inhibitor laboratory oilfield shear stress tests The starting point for an accurate simulation of field corrosivity is reproduction of the system chemistry and temperature. The brine composition, crude oil type and water/crude oil ratio are particularly important...