Oil production from weakly consolidated sandstone wasn't needed for decades, but as the time goes on, traditional oil reserves deplete and possibility of these reserves being produced is growing up. In the case of high viscosity oil, located in such reservoir, problem gets even worse. Traditional sand control methods cause lower production rates, thus, making production not profi table enough. In the industry there was need for new approach and it appearedsand management. Sand management is a risky business, but it allows some reservoirs to be produced with good enough profi t. But with right amount of preparations risk can be minimized and production becomes more likely. One of the most promising instruments of sand management is chemical treatment with UTTA. It allows to sand particles and fi nes to be held in the reservoir so they won't cause so much erosion and won't plug pore throats and fi ltration channels.

A signifi cant share of Russian oil fi elds has entered the fi nal stage of development and is characterized by a drop in production. It comes true due to the depletion of active oil reserves, and, as a consequence, an increase in the proportion of residual oil trapped in areas which are not covered by fl ooding, and physically or chemically associated with the formation of oil. An additional factor is the increase in the water content of complex-structured terrigenous reservoirs and their high number of permeable intervals. Development of the considered productive formations is carried out, as a rule, with maintenance of reservoir pressure by means of "cold" fl ooding. Despite the development and relatively low cost, it has its limitations/restrictions. The main reasons why we are not able to achieve complete displacement of oil by "cold" water are the difference between the viscosity of oil and the displacing agent, their immiscibility and hydrophobization of reservoir rocks [14]. All methods of enhanced oil recovery (EOR) used for highly watered oil fi elds with hard-to-recover reserves are aimed at additional recovery of residual oil and achieving the design oil recovery factor (ORF), by optimizing the fl ooding system and upgrading the fl ooding agents. The design ORF can be achieved by increasing the water fl ood displacement effi ciency, by improving the washing capacity of water (displacement agent), or by increasing the sweep effi ciency of the reservoir fl ooding.

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This article pays attention to the issues of increasing the efficiency of the development of oil fields with low-permeable polymictic reservoirs. It is possible to increase the efficiency of this process by improving the technology of their artificial water-flooding. This goal is being realized by identifying the features of the development of low-permeable polymictic reservoirs of fields in Western Siberia and creating a strategy to improve the technology of artificial waterflooding, taking into account the impact on the surface molecular properties of the reservoir system by the stages of their development. The developed strategy was substantiated in stages using hydrodynamic modeling. Also, an assessment was made of the effectiveness of the implementation of low-salinity waterflooding at the late stage of development of low-permeability polymictic reservoirs, the optimal time for changing the waterflooding agent from formation water to fresh water was determined.