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The formation of mineral scales is one of the most problematic threats to the oil and gas operations which can lead to loss of production, increased lifting costs and assets deterioration.1 Mineral scales can precipitate at any locations within an oil and gas production system and create blockage in perforations, production tubulars, pumps, and surface equipment. The formation of scale deposits can be attributed to the mixing of incompatible waters from different production zones or physical and chemical condition changes associated with produced water transporting from reservoir to wellhead and further to processing facilities.
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The production of heavy oil or bitumen depends upon continuous steam injection to fluidize the oil in the formation. Most of the boilers used in steam generation to enhance oil production are gas-powered once-through-steam-generation (OTSG), because OTSG’s can tolerate hard water and are relatively easy to maintain. Since an approximate 80% of feedwater is vaporized in a single pass, silica/silicate scales could form in the OTSG boiler if the silica content in the feedwater is not well controlled.