The processes of formation inorganic salts in the bottomhole formation zone contribute to the deterioration of its filtration-capacity properties and significantly reduce the productivity of oil producing wells. Analysis of the studies made it possible to identify the main indicators on which the decrease in the permeability of rocks due to salt deposition during water-flooding mainly depends. The paper proposes a thermodynamic model developed to predict the processes of salt deposition in the bottomhole zone of oil producing wells.

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The formation of inorganic salts in the bottom-hole area leads to a deterioration of the reservoir filtration properties and a decrease in the productivity of oil wells. The conducted research shows that the decrease in rock permeability due to salt deposition during flooding mainly depends on the number of filtered pore volumes of the injected solution, the rate of injection, temperature, differences in pressure, initial permeability of the rock and the concentration of the solution. The development of an empirical formula for predicting salt deposits in the bottom-hole area and describing the dependence of rock permeability on these factors involves the use of reliable experimental and field data. The authors propose a method for determining the probability of precipitation of some inorganic salts in the well.

During inclined and horizontal drilling, the cross-section of the well is deformed in the form of uneven displacement of its walls, which is one of the reasons for tightening and tool sticking. To limit the displacement of the walls, it is proposed to adjust the density of the drilling fluid taking into account the elastic properties of the rock and the angle of curvature of the well.