Increasing the efficiency of water shut-off in oil wells using sodium silicate

Purpose. Substantiation of technology for creation a water-blocking zone below an oil reservoir and calculation the proper composition gel-forming compound based on sodium silicate, in order to reduce water cut production wells. Methodology. The goal work was achieved by conducting theoretical experimental studies technological processes blocking reservoir, identifying patterns gel formation silicate hydration micro-cement solution conditions full-scale models. included (Na2SiO3, also referred as liquid glass) aluminum salt cross-linker (AS-1). plugging material mixture Portland contained calcium oxide, allow expansion, GL-1 reaction inhibitor. criteria assessing reliable are: mobility aqueous during its movement from wellhead bottom well, low permeability following creation, sufficient strength non-shrink annulus well. Findings. A new is suggested used create isolation which provides significant reduction production. It found that perforation string at level water-saturated followed injection into well through perforated channels, fresh prevents inflow Experiments established with gelation time 2 hours temperature 80 C, viscosity range 1.22.9 Pas, density 10801109 kg/m3. These values transportation top least resistance motion. Following time, increases significantly, after 3 days reaches 3.46.7 Pas. indicated are much greater than those oil. Therefore, proposed shut-off influx Originality. allows enhanced grouting material, combination micro-cement, together provide wells Practical value. method studying has been devised rational grout slurry expanding additive retarder models established. application research results fields 010%, against existing 7090%, increase flow rate producing 2030%.