Justification for the use of solvent reagents to increase the efficiency of production of heavy oil
UDC: 622.276.65
DOI: -
Authors:
ROSHCHIN P.V.
1,
RYAZANOV A.A.2,
PETUKHOV A.V.3,
KANEVA E.N.4
1 Samara State Technical University, Samara, Russia
2 RITEK, Volgograd, Russia
3 NITs "VNIGRI", Saint-Petersburg, Russia
4 LUKOIL-Perm, Perm, Russia
Keywords: heavy oil, oilfield reagents, enhanced oil recovery, steam injection, hydrocarbon solvent, intensification of oil production
Annotation:
According to the State Report on the Status and Use of Mineral Resources of the Russian Federation in 2022, hard-to-recover oil reserves (HTR) have increased by 30 % (by 3,8 billion tons) over the past 9 years. This paper presents the results of laboratory studies to assess the possibility of using "Akris" solvent reagents to improve the efficiency of high-viscosity oil production at the investigated oil field. It was found that the addition of "Akris 100" and "Akris Steam" solvent reagents in a volume concentration of 2 % helps to reduce the viscosity of oil at the heavy oil field in the temperature range from 10 to 90 °C. At the same time, the addition of the "Akris Steam" reagent reduces oil viscosity more effectively at a temperature of 10 °C – by 35,5 % (a decrease from 8736 to 6443 mPa·s). The results of the study of the effect of reagent-solvents on the thixotropic properties of oil showed that the solvent "Akris Steam" showed the greatest efficiency at 20 °C. According to the results of filtration studies on a bulk model prepared from core samples of the oil field, it was found that the use of injection of a reagent-solvent rim in 2 % of the pore volume before injection of hot water (80 °C) increases the oil displacement coefficient by more than 10 %. When adding solvents "Akris 100" and "Akris Steam" the displacement coefficient of high-viscosity oil increases by 11,2 and 13,6 %, respectively, compared to displacement by hot water.
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