The problem of increasing the oil recovery coefficient by installing flow-controlling barriers in the flooded oil field in the inter-well zone is investigated. The dependences that allow giving the tamponing process the properties of selectivity and controllability have been proposed. They represent a model of the selective controlled plugging process. Such selectivity is ensured by the use of granular insulating materials of the appropriate fractional composition, i.e. controlled dispersed systems. The results of several analytical and experimental studies have been presented: the influence of the different-opening cracks’ presence on the flooding process; the rational size of the plugging barrier relative to the injection lines and its placement in the crack in order to achieve maximum oil recovery. Analytical studies based on the Kozemi model using the Bussinesk formula by the method of steady states’ successive change with respect to the process of piston displacement of oil by water from a single crack. It has been found that a crack with an opening of 2.5 μm is completely flooded after 41 years, while for a crack with an opening of 50 μm full flooding occurs in only 1 month. The performed laboratory experiments showed that crack plugging increases both the anhydrous and the final oil recovery coefficient from the model of the fractured-porous formation element. The coefficient of final oil recovery from the model of the fractured-porous formation element without crack plugging is insignificant and does not exceed 0.22. Crack plugging of the flooded oil reservoir along the extension of the crack in the case of displacement leads to an increase in the coefficient of oil recovery. The increase in the oil recovery coefficient due to plugging will be higher, the greater the degree of crack clogging along its length. After crack plugging along its entire length, the coefficient of anhydrous oil recovery from the reservoir model increases 2 times and the final one – 3 times. It is expedient to carry out plugging in the zone of the formation remote from the injection line, which ensures the preservation of the high acceptability of the injection well and increases the growth rate of the oil recovery factor
Received 17.08.2021
Revised 22.11.2021
Accepted 01.03.2022
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