INVESTIGATION OF DRAINAGE MECHANISM OF OIL FROM PORES OF OIL SATURATED ROCKS USING NITROGEN AT THE LABORATORY CONDITION

The article comprises the selection of high-efficiency and cost-effective draining agents for the extraction of waste oil, which is becoming a global problem. The effectiveness of pushing residual oil with nitrogen in small cavities of the oil layer and in the capillary matrix was discussed. The theory of the mechanism of pushing residual oil in the porous cavities using nitrogen and it is important to test in the laboratory. The nitrogen is denser than oil; moreover it is gas which it can penetrate intensively at high pressures into cavities and capillary matrices, displacing residual oil from them along the cavities to the production wells. In this laboratory experiment was used core samples from the North Karamandybas field after drying and then they are saturated with oil in the vacuum with weighting each ones. Then, a specially designed device was used to push oil using the nitrogen. It was concluded that the experience of pushing oil in oil-saturated cores samples with nitrogen has yielded positive results, using this method will be increased the oil recovery of the formation in the field.