Influence of polymer solution concentration and media permeability on the residual resistance factor

Abstract

Purpose. Determination of the required concentration of polymer solution, providing the maximum well insulation effect, depending on the filtration characteristics of the medium. Methodology. The research was conducted by experimental method using the methodology of planning the experiment. The theory of rational planning was used by varying two variables on five levels. Media permeability and polymer solution concentration were used as variables. Methods of mathematical statistics were used in processing the results. Findings. Experimental studies made it possible to build a model expressing the dependence of the residual resistance factor on the permeability of the medium and the concentration of the polymer solution. By further statistical processing the connection between permeability and necessary concentration of polymer solution was obtained. Originality. The experimental studies have substantiated the possibility of evaluating the influence of medium permeability and concentration of polymer solution on the residual resistance factor and determined its dependence on the concentration of polymer solution and medium permeability. The main point of polymer solutions application is justification and choice of the reagent concentration. The concentration should be selected in such a way that it provides the maximum value of the residual resistance factor and the viscosity of the solution necessary to level out permeability heterogeneity of the environment to some extent. To achieve this, a relationship has been obtained that allows determining the concentration of the polymer solution at a given permeability of the environment that provides the maximum residual resistance factor. Practical value. The conducted experimental studies allow developing the ideas about the regularities of water manifestations. The results of the research allow selecting purposefully both the formulations of composite systems and the technology of their application to improve the efficiency of oil production and to limit water inflows in specific geological and physical conditions.

Theoretical Justification of the Thermal Method – Steam Cyclic Treatment of Wells of the X Deposit

“…After steam injection is resumed, liquid levels begin to rise along with water cut. Thus, the above-described dynamics of indicators takes the form of harmonic oscillations, presented in Figure 2, using the example of the reacting environment of well 2724, where the injection period corresponds to an increase in liquid and water cut, respectively, the idle period corresponds to a decrease in liquid levels and water cut [12][13][14].…”

Study of the Dynamics of Associated Drill Strings Interacting With the Well Wall

“…Thus, the reason for the occurrence of transverse vibrations is the instability of rotation that occurs in the VHA: the centrifugal force leads to an increase in the bending of the column, and even a slight bend of the well or an imbalance can greatly enhance the effect. The reason for the development of torsional vibrations is usually considered a decreasing characteristic of the moment of resistance to cutting on the bit, but most researchers agree that the mechanism for the occurrence of such vibrations includes the development of accompanying longitudinal vibrations [13]. The nonlinear nature of the interaction between the bit and the rock determines the relationship between these vibration modes.…”