In most of the fields developed by the flooding method, there is an advanced flooding of borehole products associated with water breakthrough through the reservoir, backwater circulation, and also leakiness of the production column. In order to limit the extraction of "excess" water, water insulation technologies are widely used, in which hydrogels of various nature occupy a prominent place. For the rational use of water insulation technologies, it is necessary to know the rheology features and filtration characteristics of grouting materials. This article presents the results of experimental determination of a number of rheological characteristics of a composite insulating material based on sodium silicate, polyacrylamide (PAA), chromium acetate and rice husk dispersion. Rheological measurements were carried out in the oscillatory mode, which provide information about the elastic and viscous characteristics of the sample under study. The elastic modulus (accumulation modulus) characterizes the accumulated deformation energy in the system and reflects the property of the sample as a solid (elastic component). The viscous modulus (loss modulus) determines the energy dissipation and is responsible for the behavior of the sample as a liquid (viscous component). In each case, the range of linear viscoelastic behavior was determined as an interval of strain values in which the structure of the sample under study is not destroyed by deformation. Hydrodynamic modeling is increasingly used in the design of the RIW, which allows not only to reduce the time to justify the processing parameters, but also to increase its efficiency. For the convenience of subsequent hydrodynamic modeling, the results were processed using a two-component Burgers model to obtain the parameters of the elements of this model, which are a kind of «digital passport» of waterproofing materials.
Hydrocarbon based emulsions are actively used as technological fluids in the processes of oil and gas wells construction, drilling-in, workover, and in the improved oil recovery methods such as intensification of oil production, water shut-off and others [1, 2]. However, the area of effective application of emulsion compositions is determined by their physical properties. Classical hydrocarbon emulsions have low thermal stability and lose aggregative stability in reservoir conditions, due to the coalescence of globules of the dispersed phase, which leads to a decrease in the technological efficiency of their use in high-temperature formations.The authors of the article propose a modification of the emulsion system by the addition of silicon dioxide (SiO 2 ) nanoparticles in order to improve its properties. Previously, the results of experimental studies of thermal stability, which revealed the advantages of modified emulsion system with nanoparticles over classical emulsions were presented. [3]. The comparative analysis of the results of laboratory studies on the emulsion system with nanoparticles dispersity after filtration in porous media using optical microscopy is presented in article. Based on the analysis it was revealed that after filtration in natural rock cores the dispersity of the emulsion system with nanoparticles increased, and that phenomenon might be described by absence of the coalescence in the emulsion, and globules breakdown to smaller size during filtration through the porous media of rock cores from Abdulovskoe and Yugomashevskoe oil-gas fields.
This article represents the results of the research and development project that has been conducted with the goal to create an innovative and environmental water-blocking agent for the enhancement efficiency of the improved oil recovery methods. The innovation of the developed water-blocking agent lies in the combination of unique physical and chemical properties: high thermal stability (140 °C), improved rheology (viscoplastic properties), outstanding surface activity (regulation of the wettability of rock surface), and selective blocking effect. The key factor to combine all of these properties in one solution is to apply colloidal silicon dioxide nanoparticles with modified surface as a stabilizer and surface-active phase in the emulsion system. Also, a technology on the new water-blocking agent for the effective application in the intensification of oil production (well stimulation, IOP) methods has been developed, and well-tested in the field. For the investigation of the unique properties of the new emulsion systems with colloidal silicon dioxide nanoparticles, different types of laboratory experiments were carried-out, including coreflooding tests on the oilfield cores by using the facility with parallel coreholders for stand modelling of the developed technology in the IOP. The main task of the IOP technology is to redistribute the filtration inflows in the near-wellbore zone by selectively blocking the most permeable water-saturated intervals and to penerate through the less permeable inter-layers of the bottomhole zone by the acid composition.
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