BACKGROUND: Microbial corrosion is a serious challenge for the oil and gas industry worldwide, leading to huge economic losses and production issues. Successful mitigation of microbial corrosion requires a complete characterization of the microbial community present in the system. This paper deals with the extensive microbial analysis and study of performance of biocide formulations for different water types in an oilfield. RESULTS: Water, solid and coupon samples were collected at various points in the production system and analyzed for total microbial numbers by quantitative polymerase chain reaction (qPCR) and microbial diversity using next-generation sequencing (NGS). A high-throughput multi-well system was used to screen eight different biocide formulations at various dosage levels.A pipeline simulator reactor was developed and used to represent field conditions such as temperature, flow and shear rates.The tests showed that the dominant microbial species causing corrosion were sulfate-reducing Desulfovibrio spp. in seawater and brackish water systems and acid-producing fermentative Halanaerobium spp. in effluent water. The results showed that different biocide treatment strategies have to be adopted for treating different water types. Biocide formulations containing ADBAC and THPS + surfactant showed the most promising results for seawater, whereas biocide formulations of ADBAC and THPS + glutaraldehyde performed better for brackish and effluent waters. CONCLUSION:The study has shown that molecular methods such as qPCR and NGS provide better and accurate evaluation of the microbial community in the field compared with conventional growth-based methods, leading to optimized mitigation strategies. Microbial community structure analysisMicrobial community structure analysis was investigated by targeting and amplifying the 16S rRNA gene sequences of bacteria (region V1-V3) and archaea (V4-V6), subsequently sequenced J Chem Technol Biotechnol 2019; 94: 2640-2650
Black Powder has identified as a significant problem in all areas of hydrocarbon production facilities and transit or export lines. The phrase 'Black Powder' in the oil industry used to describe a contaminant found from wellhead, Gathering Centers and gas export lines. The constituents of black powder are known to adversely affect the efficiency, integrity and reliability of oil and gas production, refining and transportation. Its combines of corrosion material such as Iron sulfide, Iron oxide, Wax, Asphaltene, silt and sands. Its vary from one location to another within the process of the oil and gas production. Its presence in all areas of upstream, midstream and downstream oil and gas production. It's affecting the flow assurance and quality of performance of the facilities from compressors, vessels, tanks, sensors and pipelines and finally impacting the refinery efficiency. Its major problem start to be present recently in oil industry which many different operators have different misunderstanding to overcome these phenomena of the black powder. The paper will be to look at best strategy and solution success to mitigate the problem of the black powder in Kuwait Oil Company from west Kuwait operation facilities to Refinery. It will highlight also roots cause, Impact and prevention plan. It will show how it help reduce gas flaring, minimization facility shutdown, reduce Flowlines leaks, and optimize chemicals consumption in operation facilities which lead to cost optimization.
The strategy of the Kuwait Oil Company (KOC) is to implement key/emerging technologies at a country wide scale to meet future oil demand and production targets as planned in KPC 2040 strategy through overcome the field's challenges. KOC's Optimization strategy focuses on: Increased and optimize oil production from production optimizations Extension of field life Production interruption associated with pressure build up in reservoir, wellbore and flow lines have observed among many wells in West Kuwait fields perforated in Upper Burgan formation, which has a great impact on the company strategy. Tight emulsion phenomena is consider one the most challenging problems in West Kuwait wells due to the nature of asphaltenic crudes and high water cut production percentage. Traditional approaches to reduce high pressure and break the emulsion phase through injecting chemical near wellhead or in annuls is usually not successful in most cases and require large amount of chemical. Due to the complexity of this issue, a novel approach was used in this study to identify the main causes of oil production reduction and overcome the challenge to maximize oil production in West Kuwait fields.
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