Exploration On A New Lab Method Of Simulation Of High-Viscosity Acid-Rock Reaction

With the continuous development of technique in oil exploration and development, more and more complex reservoirs are invested in developing, then acid fracturing becomes an important technique of reservoir stimulation. To properly guide acid fracturing and optimize the design and field construction, we need to study the acid-rock reaction mechanism and do the related simulation test to determine the elements and parameters of the design and construction. In acid fracturing theory, because of the fastest-growing in the acid system, more and more high-viscosity acid system is applied to the actual reservoir reconstruction. At present there isn't the set of special theory and test methods, then research in the high viscosity of acid-rock reaction at the initial stage, and research founded that the conventional acid-rock reaction test method does not apply to high-viscosity acid system. Doing the simulated test for high-viscosity acid-rock reaction in actually and effectively is of significance to understand the high viscosity of acid rock acid reaction mechanism, accurately measure to kinetic parameters of the high viscosity acid-rock reaction and analysis behavior of acid etching of these and other types. Basing on previous studies, this paper summed up the influential factors of acid-rock reaction and including focuses on mechanism of acid-rock reaction, kinetics of acid-rock and behavior of acid etching. In the simulation test of acid-rock reaction, it is important to reasonably consider and design in influential factors of acid-rock reaction and effective study of the key factors of the acid-rock reaction. From the content and test equipment in simulation test of acid-rock reaction, making analysis and comparison in characteristics and applicability of the conventional simulation test of acid-rock reaction, and proposing to the test content which is consider the flow of acid into the influential factor of the acid-rock reaction. To simulate the flowing characteristics of acid in the fracture formation and analysis accuracy of simulation test of acid-rock reaction, introducing and improving the discriminant methods of flow parttern and stability of non-Newtonian fluid, with power law model, in annulus-type, and simulating flow pattern and stability of different type acid in conditions of conventional construction. Participating in the research and design new device for simulation test of high-viscosity acid-rock reaction, designing concepts and working principles have been applied. Using the device to do simulation test for including the gelled acid and cross-linked acid groups of the high-viscosity acid of the acid-rock reaction, confirmed the difference between the conventional acid and high viscosity system in the acid-rock reaction. Results of simulation test of high-viscosity acid-rock reaction showed that this simulation method of acid-rock reaction is workable, whose experimental data is highly reliable and stable, which provides theory and practical guidance for on-site practice of high viscosity acid system and content of further research in acid-rock reation.