SEMI–PERMEABLE MEMBRANE METHOD IN DRAINING-IMPREGNATION MODE IN THE INVESTIGATION OF OIL AND GAS COLLECTORS

In the complex of petrophysical methods for studying reservoir rocks, the semi-permeable membrane method whereby the residual water saturation and the structure of the pore space are mainly determined during the modeling of the process of produced water displacement by gas during the deposit formation, is quite widely used. In this case, the membrane operates in drainage mode. To address issues that arise during the oil and gas fields development,  the reverse process is also of interest - modeling the reverse water flooding of the pore space when the gas pressure in the deposits decreases or during forced water flooding of the deposits, or when studying the processes of selective water flooding of wells. In this case, the membrane should work in the drainage mode for the first part of the experiment, creating residual water saturation, and.it should work in the impregnation mode fo rthe second part of theex periment. The drainage mode is described in sufficient detail in the literature, there are practically no materials on reverse impregnation. The carried out work was aimed at developing a semi-permeable membrane method for the drainage-impregnation regime to the extent of practical use, including carryingouta small number of test studies. The developed methodology will be explained in complete detail in the corresponding methodological manual, mainly its problematic aspects are considered here. Further application of the developed methodology will be aimed at solving specific problems arising in the process of hydrocarbon deposits development. Among the priority objects of study are the processes of gas displacement by oil from oil banks, oil displacement by water, oil and gas mixture displacement during the cycling process.