Combined gas effect on the oil reservoir in a dual-well system

Abstract

Nowadays, high-viscosity oil reservoirs are located in a sphere of extra attention with the demands of special technologies. To maximize high-viscosity oil production advanced action technologies are used involving thermal and many other chemical methods. The article describes the results of a laboratory experiment to determine the rheological properties of high-viscosity oil, which determine the optimal temperature of the reservoir heating. A new method of thermobaric layer treatment; including heat transfer agent injection by a dual-well system; is suggested (injection to a vertical shaft and a heated oil production from a side shaft). A new steam injection steam-gas injection is proposed. The optimal layer warming temperature was 50 °C. The results of the calculations of the radius of the reservoir heating to the target temperature, which allowed for optimizing oil production are also discussed. Efficiency and warming area dependence on a heat-transfer agent to a layer injection time are also identified and presented. It was observed that thermo-physical calculations using the data of a laboratory experiment are useful in the well-design, as it allowed to determine the parameters of the technology and the position of the bottom hole about the source of heating. The optimal bottom hole spacing between the production side shaft and the vertical shaft was found to be 76.0 m. The optimal temperature of 50 °C was reached 10 days after the warning started.