%A"Cubric, S" %D1970 %I; %2 %J[] %K02 PETROLEUM, 58 GEOSCIENCES, OIL WELLS, WELL COMPLETION, WELL DRILLING, RESERVOIR ROCK, PERMEABILITY, MULTIPHASE FLOW, PETROLEUM DEPOSITS, SEDIMENTARY ROCKS, SURFACTANTS, DRILLING, FLUID FLOW, GEOLOGIC DEPOSITS, MINERAL RESOURCES, RESOURCES, ROCKS, WELLS, 020300* - Petroleum- Drilling & Production, 580300 - Mineralogy, Petrology, & Rock Mechanics- (-1989) %PMedium: X; Size: Pages: 423-431 %TInfluence of infiltrated water on the change of formation water and oil permeability of crude oil bearing rocks %XA brief desription is given of the causes of permeability reduction of oil-bearing rocks, due to well damage during the drilling and well completion or when working over wells. The physical properties of 2-phase flow (crude oil-water) and the possibility of increasing the existing permeability of the formation, because of the water infiltrated from the well into the crude oil layer, are described in detail. Field examples show that there are such cases, and that the artificially increased existing permeability of water-bearing rocks can be reduced and even brought to normal, if the adjacent formation zone layer is treated with surfactants (e.g., Hyflo dissolved in crude oil). %0Journal Article %N;Journal ID: CODEN: NAFYA %1 %CYugoslavia %Rhttps://doi.org/ Journal ID: CODEN: NAFYA HEDB %GSerbo-Croatian