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Crude oil currently extracted on many oil fields of Russia and Kazakhstan has a complex physical-chemical and rheological properties. Approximately 10-20% of the crude oil has a high content of asphaltenes and large amount of paraffin waxes with high melting point. Usually, at low temperature paraffin waxes that present in crude oil tend to precipitate which hinder and sometimes prevents transportation of crude oil. The content of crude oil with high amount of paraffin waxes in total amount of extracted crude oil increases every year and hinders the transportation using transfer lines and tank cars. There are several ways to overcome this problem. The crystallization of paraffin waxes can be prevented by heating the crude oil to 50-60°C, however this can be economically unfavorable and sometimes is not even possible. It is also possible to mix heavy fraction of crude oil with more mobile “light” fraction of crude oil or other solvents, however most of the time these products are not available in the sufficient amounts. Therefore, it is necessary to use different type of additives. Our series of pour point depressants DMN is one type of such additives aimed to modify structure of paraffin crystals. These additives improve the flow of crude oil and eliminate risk of crude oil solidification at the stage of transportation via transfer lines. Moreover, DMN additives are also contain surfactants and thus also features washing abilities.
DMN additives prevent normal growth of paraffin crystals and asphaltenes substances and also improve rheological properties of crude oil. In practice it means significant decrease in transportation costs due to decrease in pour point temperature of crude oil after introduction of DMN additive. The effect of additives is usually evaluated by the loss of flow point.
Field use confirms that in many cases DMN additives are the most cost effective modifying agents for heavy fraction of crude oil and their usage provides safe and efficient transportation of crude oil.