THE OIL DEMULSIFICATION MODE IN OIL FIELD TREATING OPTIMIZATION

Abstract

Background In the late stages of the development of oil fields, the oil production process is accompanied by high water cut, which leads to such complications as the inorganic salt deposits on the internal walls of the pipelines, high corrosion damage to pipelines and equipment, and intensive formation of emulsions. These complications lead to an increased risk of accidents, environmental and commercial damage. Obtaining commercial dehydrated oil from emulsions is usually achieved by a thermochemical method, i.e. heating the emulsion to 40-60 °C and introducing special reagents - demulsifiers. Aims and Objectives More than 100 varieties of demulsifiers are presented on the Russian oil field market, each of which shows high efficiency under certain conditions. Optimal selection of the type of demulsifier and the mode of its application guarantees high quality of oil field treating. The aim of the article is to determine the optimal technological regime parameters - temperature, flow rate - when the fluid is dehydrated by chemical reagents. Methods The task was solved on the basis of the results of an experimental study of a 20 % oil emulsion. As a method of instrumental fluid study, a bottle test was used. The initial base of chemical reagents were 20 demulsifiers of Russian and foreign production. A method for choosing the optimal regime of dehydration of the extracted liquid on the basis of information on the preferences of the decision maker is proposed. Multiple pair comparison of criteria statistically approximates the resulting solution near the optimal one. Results The implementation of the decision-making optimization method based on the properties of demulsifiers is recommended to optimize the choice of the usage of the oil treatment reagent mode. It is shown that for oils of the West Siberian region of Russia, the usage of the demulsifier Intex 1018A at the temperature of 60 °C, dosing of 15 g / t, settling time of 30 min is optimal. At the same time, the relative allocation of water will amount to 94.1 %.