DOI:10.24411/2076-6785-2020-10076
Abstract
The paper describes the laboratory experiments on low-permeable reservoir models flow properties study after treatment with dispersed mixtures based on bentonite clay powder used in enhanced oil recovery technologies. The study results show that when clay powder is injected into a reservoir model with residual oil saturation, the model's water vapor permeability decreases mainly due to the formation of a "clay crust" on the surface of core samples. The "clay crust" removal leads to a significant restoration of the reservoir model's permeability and an increase in the oil displacement efficiency. When the dispersed mixture is injected into fractures and water-saturated intervals of the reservoir model, it results in irreversible clogging. Field tests of dispersed mixtures have shown that the injection of clay powder into injection wells leads to a redistribution of flows due to partial clogging of water-washed intervals, while further in the process of water injection, the well injectivity profile continues to change.
Materials and methods
Materials: core samples from AS group of West Siberia reservoirs; Core Perm Flow Unit; core study method — industry standard OST 39-195-86.
Keywords
EOR technology, disperse mixture, reservoir model, permeability, oil displacement efficiency, injection well, well injectivity profile
