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A biocide efficacy study was conducted using field water samples and associated indigenous microorganisms as the test inocula. Thirteen biocide systems were evaluated to determine an excellent choice for disinfecting (rapid kill), to alleviate bio-burden and result in longer term protection.
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The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
The Wafra Joint Operation (WJO) Oilfield is located in the central-west part of the Kuwait-Saudi Arabia Neutral Zone. The Wafra oilfield reserves were first discovered and wells drilled in 1954. This field produces two types of crude oil, Ratawi (light oil) and Eocene (heavy oil), with average water cut of 8085%. During operation, the production wells produce the oil emulsion through mostly coated flowlines to sub-centres (SC) where the sour oil, water and gas are separated. The facility has two gathering fields; Eocene and Ratawi. Eocene has 2 phase separation, whilst Ratawi has 3 phase separation. The sour gas is either flared or flows to the Main Power Generation Plant, whilst the oil is processed to the Main Gathering Center (MGC). The produced waters (PW) are routed to the Pressure Maintenance Plant (PMP).
The Wafra Joint Operation (WJO) Oilfield is located in the central-west part of the Kuwait-Saudi Arabia Neutral Zone. The Wafra oilfield reserves were first discovered and wells drilled in 1953 and production in commercial quantities began in 1954. This field produces two types of crude oil, Ratawi (light oil) and Eocene (heavy oil), with average water cut of 80-85%. During operation, the production wells produce the oil emulsion through mostly coated flowlines to sub-centres (SC) where the sour oil, water and gas are separated. The facility has two gathering fields: Eocene and Ratawi. Eocene has 2 phase separation, whilst Ratawi has 3 phase separation.
Several alternating current (AC) coupon test stations (CTS) located near AC power lines were investigated to assess the AC interference corrosion risk of the test coupons. Asstation consisted of two ½ inch (1.27 cm) diameter and 1received each AC test inch (2.54 cm) long carbon steel (CS ) coupons. Coupons are much larger than 1 cm 2 and current density measurements are not 100% relatable to the SP21424 or ISO 18086 criteria, since these refer to measurements on (typically) 1 cm2 . The current densities measured on the coupons in this study will underestimate the AC corrosion threat.
The goal of this compilation is to educate the reader through experiences and observations from real-world applications and to provide tools for the identification and remediation of pipeline corrosion issues before failure. Pipelines have been used to transport fuels since the 19th century. While there is no clear consensus of the total number of pipeline miles in use throughout the world, most agree that the U.S. has over 2.5 million mi of energy pipelines. This book provide tools for the identification and remediation of pipeline corrosion issues before failure.
2018 NACE e-book
Microbiologically influenced corrosion (MIC) - 38 articles and papers. MIC management process. Threat assessment. Mitigation. Prevention. Monitoring. Management. Lists of MIC resources, standards, courses & books. 2015 NACE E-Book
In the literature, corrosion problems associated with crude oil are often categorized into several classes, based on the type of equipment and “distance” from a well. The upstream operations (drilling, pumping) transport crude oil mixed with significant amounts of water and gasses, midstream operations (transport and storage before refining) deals with much drier crude with most of the water and gasses removed and upstream corrosion problems are mostly caused by chemical composition of given specific fraction and high temperature. Corrosion problems in midstream operations are usually not as severe as during drilling and initial transport, however, this step is significantly longer.
Electrochemical techniques enabling real-time survey of corrosion, such as multi-electrode arrays sensors (MASS) and linear polarization resistance (LPR) were used to detect the differences in electrochemical behavior of two stainless steels.
According to a survey of corrosion releases in hazardous liquids pipelines, of the 52 internal corrosion releases reported in 2009-2012, 31 occurred in intermittently operated lines. Pigging operations cannot be performed in many of these pipelines for a number of reasons, such as limitations imposed by pipeline design features, pigging cost, risk of the pig getting stuck in solids or sludge accumulated in front of it. For unpiggable pipelines, direct assessment using the liquid petroleum internal corrosion direct assessment (LP-ICDA) method is a widespread industry practice that helps operators detect pipeline sections damaged by internal corrosion. The models and correlations referenced in the standard are for steady-state, oil-water flow or liquid-solids flow, however the flow of transported fluids is transient (unsteady) in intermittently-operated, crude-oil pipelines. Furthermore, the critical inclination angle defined in the standard is applicable to a pipeline having a piecewise elevation profile. Nevertheless, the local slope of the pipeline changes continuously along its entire length because the local slope of an elevation profile of the landscape or seabed changes continuously in most cases. In this paper, a pipeline diagnostic survey using transient, ultra-high definition simulations of three-phase oil-water-solids flow is performed to identify ICDA regions and develop solutions to extend the useful life of a 48-in. diameter pipeline transporting crude oil from an onshore tank farm to a Single Point Mooring/Pipeline End Manifold (SPM/PLEM) system. Transient free water and solids holdup profiles along the pipeline during loading operations and shutdown periods were predicted based on historical cargo data (including detailed loading plans and loading rates), basic sediments and water (BS&W) data, the rate of conversion of emulsified water into free water caused by the residual concentration of demulsifier in crude oil, solids properties, and tanker loading schedules. It was found that significant accumulations of free water and solids occurred only in a few sections of the offshore portion of the pipeline. This was attributed to the fact that in each loading operation the cargo officer requests the terminal to reduce the loading rate and adjust it until the final cargo transfer quantity is reached. As a result, during this time the pipeline is operated at a low flow condition at which free water ceases to enter PLEM, while it is still displaced from the onshore portion into the offshore portion of the pipeline. Two solutions were proposed to prevent microbiologically influenced corrosion (MIC) and extend the useful life of the pipeline. The first solution is based on the optimization of the loading plan to minimize the volume of free water accumulated in the offshore portion on completion of cargo transfer. In the second solution, a system generating batches of drained water taken from the storage tanks is connected to the pipeline inlet. A biocide is injected into the water batches. The concentration of the biocide and speed to kill are selected based on the water batch residence time determined using the transient flow simulations. The number of water batches to be launched depends on the volume and properties of solids that can enter the pipeline.