USING A GEL-FORMING COMPOSITION TO REDUCE THE WATER REHABILITATION OF OIL WELLS WITH HIGH-VISION OIL
Relevance. Flooding of producing wells is a natural process in oil field exploration. Well irrigation is primarily affected by reservoir heterogeneity in terms of filtration properties - stratified (along the section) and zonal (along strike), presence of bottom water, oil-wa-ter zones, and increased viscosity of reservoir oil. The front movement speed increases in highly permeable layers, which speeds up the premature watering of the wells. The aim of the research is to evaluate the most effective waterproofing technologies in the Perm region and explore the possibility of using them in an oil field. Object: carbonate deposits with high-viscosity oil of the Nozhovskoy group of fields in the Perm region. The average viscosity of reservoir oil for 8 development objects in deposits of the turnaiskii stage (T) is 72,1 MPa*s, with a high value of dissection coefficient (6,23). Average values of water cut and oil recovery ratio reach 1,8. In such conditions, methods of well insulation are widely used. Methods: analysis of the results of the work performed to reduce well water-cut, hydrodynamic modeling of water insulation works in wells in an oil field. Results. In the Perm region, higher efficiency while limiting the inflow of water to producing wells by the washed layers for reservoirs with a carbonate reservoir is noted for gelling and sedimentation technologies. In injection wells, work on alignment of injectivity profiles was carried out mainly with the use of cements, resins and polyacrylamide. The high efficiency of use was shown by the technology with sediment- and gelling components based on lignosulfonates. The authors have simulated the operation of the element of the reservoir using sedimentary and gelling agents for the Berezovsky oil field site. It was believed that the pickup of the upper interval will decrease by 82 % during flooding works. For producing wells during the year, the water cut decreases by 3...15 %, and the total oil flow rate increases by 0,9 t/day.