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INTEGRATED ASSESSMENT OF CHEMICAL TECHNOLOGIES USING OPTICAL METHODS

Irina Guskova, Vadim Sayakhov, Assoc. Prof. Dilara Gumerova, Lenar Shaidullin

Abstract

At present, scale control through chemical inhibition is the preferred method in oil recovery though the principle of chemical agent action is still considered complex and not fully understood. An important issue that needs to be addressed is associated with compatibility of techniques and their impact on the reservoir and borehole zone. Scale control solutions remove deposits effectively and inhibit their formation, reducing costs associated with scale cleanup and disposal, while helping increase production and prolong the life of your well. New approach can help protect production equipment from damaging mineral deposits, maintaining asset integrity, and enhancing production over the entire life cycle of the well. The list of chemicals and techniques of their application for treating the reservoir, its bottom-hole zone and workover is long enough, but it is also well-known that their application often results in negative impact on related technologies and impairment of crude oil properties. Almost all studies regarding selection of the optimal chemical agent are based on the study of the chemical composition influence on scales dissolution kinetics and depend on the composition of scale depositions. It does not take into account properties of depositions, their structure and possible changes caused by previously used techniques. In addition to the standard evaluation of chemical agent effectiveness it is necessary to assess their influence on the colloidal stability of crude oil and formation of oil-water emulsions. There is no methodology for integrated evaluation of chemical agent efficiency used in technological processes of oil recovery, and in the long run this may cause a number of challenges and complications in allied technological subsystems. The authors propose the use of spectrophotometric methods to monitor crude oil property changes to assess the compatibility of chemical methods used. Light absorption coefficient depending on the content of high molecular weight components in crude oil, i.e. asphaltenes, resins and waxes, is used as an integral crude oil parameter. The authors have developed recommendations on the basis of their research work to control scale deposition which are able to reduce the amount of generated sludge and stable high viscosity emulsions.

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DOI resolver: doi.org/10.5593/sgem2017/11/s01.034

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