«Geology, geophysics and development of oil and gas fields»

Experimental study of using supercritical fluid systems to increase the coefficient of viscous oil displacement from terrigenous reservoirs in mixing and microbubble modes of supercritical СO2 filtration

UDC: 622.276.6:661.97+553.1
DOI: 10.33285/2413-5011-2022-5(365)-36-42

Authors:

¹ Institute of Applied Research of the Academy of Sciences of the Republic of Tatarstan, Kazan, Russia
² Design Institute "Soyuzhimpromproekt", Kazan, Russia
³ Kazan National Research Technological University (KNRTU), Kazan, Russia

Keywords: supercritical fluid, viscous oil, homogeneous formation, oil displacement coefficient, thresholds of secondary oil recovery enhancement methods, mixing filtration mode, microbubble filtration mode

Annotation:

New experimental and calculation data on supercritical СО₂ solubility in transformer oil are obtained. The decrease of supercritical СО₂ solubility in transformer oil at the temperatures of 313K and the pressure below 12 MPa as well as the formation of supercritical СО₂ microbubbles in the pore, overlapping it and significantly reducing the value of the oil displacement coefficient, is shown. To increase oil displacement factor in supercritical СО₂ micro-bubble medium, it is proposed to use injection of supercritical СО₂ and water portions. The process of transformer oil displacement using supercritical СО₂ and supercritical СО₂ and water portions at different injection modes in the pressure range of 8…12 MPa at temperatures of 313 and 333 K was experimentally studied. A way for oil recovery enhancement when using supercritical СО₂ and water portions is proposed, which consists in formation and stabilization of supercritical СО₂ microbubbles on the pore surface sublayer.

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