A high differentiation of the permeability along the section of the formation is often the reason for premature watering of highly permeable interlayers. The filtration flow almost completely rushes into the impregnated interlayers, while the displacement of oil from the less permeable sections of the section slows down considerably or stops completely. The result is the loss of a significant number of mobile stocks and a low oil recovery factor. To solve this problem, technologies are used, which, depending on the purpose of the treated well, are referred to as equalization technologies of the injectivity profile or the isolation of water inflows. The essence of these technologies is the redistribution of filtration flows by disabling the water absorption intervals or arrival water by injection of grouting mortar, chemical reagents - gels, various colmatants, etc.
The article presents the results of filtration tests on the core of a waterproofing composition intended for processing production and injection wells that operate a layered heterogeneous reservoir. The waterproofing ability of the composition is based on the interaction of the reagent with highly mineralized solutions of calcium or magnesium chlorides with the formation of sediment in the pore space and its colmatation. Due to the good mobility, the composition first penetrates into the most permeable watered layer, turns it off and then penetrates into the less permeable layer. The compatibility of the composition with the oil makes it possible to treat the well with a single filter. Filtration tests of the waterproofing composition were performed using three-layer core models simulating a layered heterogeneous formation for the conditions of the producing and injection wells. Studies have shown the high efficiency of the composition for the redistribution of filtration flows, especially in conditions of the injection well. The use of the composition led to an additional displacement of oil, the increase in the displacement coefficient for the formation models was 0.25-0.30.
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