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|Type:||Artigo de evento|
|Title:||Catalytic Effect Of Metallic Additives On In-situ Combustion Of Two Brazilian Medium And Heavy Oils|
|Abstract:||Increasing the final recovery factor from mature fields is a major challenge to meet the growing energy demand in the coming years. The in-situ combustion, an important thermal enhanced oil recovery method, has experienced an increasing interest as an alternative solution to this challenge. In-situ combustion is the process of injecting oxygen into oil reservoirs where a portion of oil is burned and heat is in-situ generated. As consequence the oil viscosity decreases resulting in larger oil recovery factor. The propensity of the reservoir oil to form fuel is a major constraint limiting the applicability of the in-situ combustion. In lighter oil reservoirs insufficient fuel may be deposited resulting in a combustion front that cannot be self-sustained. Contrariwise, in heavier oil reservoirs excessive fuel may be deposited leading to high air injection. Metallic salts are known to play an important role as a catalyst and thereby affect the amount of fuel formed. This paper describes an experimental study with eight combustion tube runs to evaluate the effects of metallic additives in the combustion of two Brazilian medium and heavy oils. The oils are 12.8° and 27.2° API, respectively from an onshore field in Espirito Santos Basin and an offshore field in Santos Basin. The metallic additives are iron nitrate and zinc nitrate. Results for the heavy oil show that a self-sustained front combustion can be obtained only with the presence of clay, due to its catalytic effect. The addition of iron nitrate increased the fuel concentration while increasing the air requirement and reducing the combustion front velocity. The addition of zinc nitrate also increased the fuel concentration and increased the air requirement and reduced the combustion front velocity. Interesting results were observed for the medium oil: a self-sustained combustion was not achieved only with the presence of clay, but stable and sustained combustions were observed with the addition of iron and zinc nitrates. Iron and zinc salts are metallic additives with potential to expand the range of candidate reservoirs for in-situ combustion. Further studies are necessary to evaluate potential additives to act as fuel reducing agent. Copyright 2014, Society of Petroleum Engineers.|
|Editor:||Society of Petroleum Engineers (SPE)|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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