EXPERIENCE IN THE IMPLEMENTATION OF WATER-GAS EXPOSURE TECHNOLOGY IN THE FIELDS

Abstract

Deterioration of the qualitative and quantitative characteristics of the hydrocarbon resource base leads to an increase in the share of hard-to-recover reserves. In an environment where the share of hard-to-recover oil reserves in the oil industry is steadily increasing, the need to create effective methods to increase oil recovery is acute. The method of flooding at the present stage of the development of the oil industry is considered the most progressive, meeting the basic principles of oil field development. However, during flooding, a large proportion of oil reserves remains in the reservoir, and therefore, technologies are currently being sought and developed in all major oil companies that will increase the oil recovery coefficient. Currently, there is a growing interest in the application of the technology of water-gas exposure to oil formations to increase oil production. This is due to the fact that the water-gas effects combine the positive aspects of well-known oil production technologies, such as flooding and the method of pumping hydrocarbon gas into the reservoir. Experimental and theoretical studies have established that one of the most effective methods of oil recovery can be methods based on injection of hydrocarbon gases and water-gas mixtures into the reservoir. Experiments were conducted to study the mechanism of displacement and determine the coefficient of displacement of oil by gases and water in various combinations in relation to some fields. The experiments were carried out under conditions as close as possible to reservoir conditions: recombined or reservoir oil samples, core from productive deposits were used. The pressure and temperatures corresponded to their reservoir values. As the results of experiments, the increase in the oil displacement coefficient depends on the type of gas injected (hydrocarbon equilibrium and nonequilibrium with reservoir oil, acidic, inert, etc.) and modification of the injection technology of agents (sequential, alternate, joint). To study the expected results of testing the technology of water-gas exposure at the Kalamkas field, the experience of using this method at other fields is considered. The paper presents an analysis of the experience of implementing the technology of water-gas exposure at various locations. A review analysis of the results of the technology implementation was carried out to determine the advantages and possibilities of using the technology of watergas exposure in the conditions of the Mangystau field.