Efficiency of Stationary and Non-Stationary Modes of Hot Water Injection during the Development of High-Viscosity Oil Deposits in Carbonate Reservoirs of the Komi Republic Field

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Abstract

The paper presents a geological and field analysis of the effectiveness of stationary and non-stationary operating modes of the reservoir pressure maintenance system, during which hot water was pumped during the development of one of the carbonate deposits of the Timan-Pechora oil and gas province. The determining factors for the complexity of the development of the studied object are the ultra-high viscosity of oil and significant geological heterogeneity. Due to these factors, advanced watering complicates the development of the deposit. The current oil-water factor is 7.9. Increasing the efficiency of development of the facility is possible, among other things, by improving the technology of hot water injection, organized at the pilot site of the deposit in 2020. Based on the negative experience of implementing the technology associated with water breakthroughs to production wells during stationary injection, a complex injection technology was developed. It based on a combination of cyclic hot water injection, chemical composition use in injection wells to equalize the displacement front and prevent water breakthroughs in producing wells, and limiting the produced water volume to reduce unproductive injection and reduce the water-oil factor by shutting down unprofitable high-rate wells. Non-stationary flooding improves the efficiency of reserves recovery due to the initiation of fluid exchange between pore blocks and fractures due to the created variable pressure gradient, while stationary injection allows only the most permeable intervals to be involved in oil reserves. In conditions of high water cut, optimization of the injection technology will increase the recovery rate of residual oil reserves and reduce produced water volume, as well as ensure greater economic efficiency of reservoir development by reducing operating costs.

Keywords

superviscous oiladvance wateringmatrixfracturesthermal methodshot waterproduced waterdisplacement characteristicsgeological and technological modelstationary injectioncyclic injectionpiezoconductivityhalf-cyclechemical compositionunprofitable wellshydraulic transport

Bibliography

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Article information

Published
22 March 2024
Issue date
22 March 2024
Issue
Vol. 23, No. 2 (2023)
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