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EVALUATION OF PARAFFIN AND ASPHALTENES PHASE EQUILIBRIUM IN PETROLEUM SYSTEMS
Abstract
Asphalt-resin-paraffin deposits (ARPD), are formed in processes of oil recovery on a surface and represent a serious problem for the oil production enterprises from the technical, economic, and ecological points of view. The ARPD quality indicators are an important factor defining effectiveness of removal procedures and searching of ways to its further use. At a late stage of fields exploitation the production processes are complicated by loss of asphaltenes and paraffin immediately in a layer pore space. It is connected firstly with decreasing of internal temperature of the medium and with decreasing of their solubility in crude oil. The formation of deposits process modeling on laboratory installations does not reproduce real conditions, however improving of precipitation processes modeling methods with taking into account influence of major factors allows receiving the most approximate models. The purpose of this research is studying of paraffin and asphaltenes phase equilibrium in oil systems, and the process of their deposition from solution. There was used the inventory for experiments which based on gravimetric method. By means of it stability of paraffin and asphaltenes is measured, the kinetics of their deposition at different temperatures is estimated. Its advantage is the small volume of tests and immediate measurement of the deposition of solid particles beginning under conditions of different temperature without the necessity of visual observation. In researches we assume a number of the case studies imitating mixing of liquid, a capacity destruction, change of temperature along a trunk of the well and the ARPD deposits risk connected with. Temperatures of paraffin emergence and temperature of paraffin disappearance for paraffinic crude oil are measured. The factors influencing on equilibrium in system paraffin-asphaltenes-hydrocarbons with application of low molecular n-alkanes as solvents are considered.
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