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OPTICAL METHODS FOR ASSESSING RECOVERED OIL PROPERTIES CHANGE CAUSED BY INJECTION OF MULTIPURPOSE COMPLEX AGENT
Abstract
Oil composition at the late stage of field development is determined by both natural and anthropogenic factors. Change in compositi on and physical-and-chemical properties of oil could be considered significant in several ways. This is due to both changes in the interaction of oil and injected agents, and involvement of the reserves not yet developed. The most sensitive, quickly a nd accurately determined parameters are optical characteristics of oil, and namely the coefficient of light absorption. It depends on the content of asphaltenes and resins in crude oil and is objectively determined by a photoelectric method. To assess the impact of EOR on the properties of crude oil, we studied crude oil samples selected from sites where EOR me thods were used. We studied the Devonian deposits of North-Almetyevsk area, Romashkinskoye oil field. Photocolorimetry is considered to be the main method for rapid assessment of the well respond to EOR method by changes of oil properties. To eliminate the influence of any other factors except EOR, only those sites were selected in which no activitie s, that could influence the change in crude oil optical density, were carried out . To monitor the success in the EOR use and the use of photocolorimetry method for evaluating the effectiveness of the impact, statistical analysis of the well performance in combination with study of optical propertie s of crude oil, samp led from sites where EOR had been used. It has been proved that due to increasing heterogeneity of oil flow at the late stage of field development, the use of EOR makes it possible both an increase and decrease the optical density of oil being produced. Th e change in composition and physical-and- chemical properties of oil in the reservoi r may be associated with changes in the interaction of oil and injected agents, a nd the reserves not involved in the field development process. Consequently, the efficiency of РЎРќРџРҐ-9030 multipurpose agent injection was studied.
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References6
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