CURRENT PREDICTION OF RESERVOIR PARAMETERS UNDER THEIR OPTIMIZATION CONTROL DYNAMICS. PART 1. WATER CUT FRONTS PREDICTION IN HYDROCONDUCTIVITY ANALYSIS
The article considers the method of current forecasting of the coordinates of the advancement of the water cut fronts in the dynamics of extreme regulation of the oil recovery process. This is due to the need to increase the oil recovery factor during the operation of a productive formation in real time. The aim of the work is to establish indirect measurements of the current coordinates of the water cut fronts of the developed formation. In contrast to traditional continuous oil displacement technologies with an assumed estimate of the coordinates of the water cut fronts, accurate values can be obtained only in the implementation of metatechnology for the production of hard-to-recover hydrocarbon reserves. The tasks of implementing metatechnology of oil recovery are reduced to the most complete development of production facilities of the reservoir in terms of their volumes. This is accomplished by combining oil displacement cycles, as well as research and plugging of unproductive areas in interwell zones with elastic-rigid operating modes. It is shown that the geometric parameters of the trajectories of the formation channels (flow tubes) change during the transition from reservoir pressures for delivering portions of tracer marks or plugging to the nominal oil displacement pressure. An increase and decrease in the shape of the reduced radius of the current tube establishes the use of the DupuisForchheimer and Bernoulli equations in modeling. In this part of the work, transformations are used based on linear hydraulic resistances in spatio-temporal quanta of delivery of portions of labels and grouting. It is shown that when developing a method for predicting the current coordinates of the water cut fronts of exploited productive formations, it is possible to additionally determine the values of the permeability coefficients in the flow tubes