(EXPERIENCE WITH NON-STATIONARY WATERFLOODING IN THE VIKULOVSKAYA (VK) AND TYUMEN (YUK) FORMATIONS)
В статье рассматриваются результаты опытно-промышленных работ по нестационарному заводнению, проводившихся на одном из месторождений Западной Сибири, которое характеризуется высокой неоднородностью строения продуктивных пластов и высоким уровнем обводненности продукции при низкой выработке запасов нефти. Участки для реализации нестационарного заводнения были выбраны в соответствии с методикой, основанной на использовании четырехслойной геолого-статистической модели, учитывающей наличие литологической связности низкои высокопроницаемых пропластков. Применение данного гидродинамического метода позволило увеличить охват пластов заводнением и вовлечь в процесс дренирования низкопроницаемые пропластки и застойные зоны пласта. Значительная дополнительная добыча нефти была получена в том числе за счет изменения направления фильтрационных потоков. В результате проведенного анализа эффективности сделаны выводы об оптимальном значении комплексного параметра для перспективы реализации нестационарного заводнения. Кроме того, рекомендовано не сочетать реализацию нестационарного заводнения и гидравлический разрыв пласта.
The article deals with the results of experimental-industrial work on non-stationary waterflooding carried out in one of the fields in Western Siberia, which is characterized by high heterogeneity of the structure of productive formations and a high level of production watering at a low oil reserve depletion. Areas for the implementation of non-stationary flooding were selected according to the methodology based on the use of a four-layer geological and statistical model, taking into account the presence of lithological connectivity of low- and high-permeability interlayers. Application of this hydrodynamic method made it possible to increase waterflood coverage of reservoirs and involve low-permeability interlayers and stagnant reservoir zones in the drainage process. Significant additional oil production was obtained, among other things, due to a change in the direction of filtration flows. As a result of the efficiency analysis, conclusions were made about the optimal value of the complex parameter for the prospect of implementing non-stationary waterflooding. In addition, it is recommended not to combine the implementation of non-stationary waterflooding and hydraulic fracturing.
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