Abstract
The object of research in this work is the intensification of hydrocarbon production. The most problematic task of the study is the efficiency of intensification of compacted high-temperature carbonate reservoirs. Despite the gradual transition to renewable energy sources, natural gas and oil will play a dominant role in the world's energy balance in the next 20–30 years. Carbonate rocks have significant mining potential, but low filtration properties require intensification to improve reservoir permeability. High temperatures and pressures at great depths require the improvement of existing hydrocarbon production technologies. The most popular method for treating reservoirs containing carbonates is acid treatments in different variations, but for effective treatment it is necessary to achieve deep penetration of the solution into the formation. The study solves the problem of selection of effective carrier liquids for the preparation of acid solutions for the treatment of compacted high-temperature reservoirs with high carbonate content. To ensure quality treatment, acid solutions must have low viscosity and surface tension coefficient, low reaction rate, their chemical properties must ensure the absence of insoluble precipitates in the process of reactions with fluids and rocks, as well as be environmentally friendly. To select the most optimal carrier liquid, experiments were conducted to determine which candidate liquids provide the minimum reaction rate of acidic solutions with carbonates. Based on the analysis of industrial application data and literature sources, water, nephras, methanol, ethyl acetate, and methyl acetate were selected for further research. Widely studied acetic acid was chosen as the basic acid. Studies have shown that methyl acetate has a number of advantages, namely low reaction rate, low viscosity and surface tension coefficient. As well as the possibility of hydrolysis in the formation with the release of acetic acid, which significantly prolongs the reaction time of the solution with the rock and the depth of penetration of the active solution into the formation.
Highlights
The global strategy for the development of the energy sector, related to the «green transition», today requires new approaches to this issue by scientists around the world
To confirm the effectiveness of the developed acid solutions, further studies based on methyl acetate and carbo xylic acids should be performed on the cores of compacted carbonate rocks in formation conditions using high pressure and temperature filtration units (HTHP)
The study showed that in order to intensify the extraction of oil and gas from compacted low-permeability high-temperature carbonate reservoirs, it is necessary to develop acid solutions that would meet modern requirements for the development of deep hydrocarbon deposits
Summary
The global strategy for the development of the energy sector, related to the «green transition», today requires new approaches to this issue by scientists around the world. Operators often do not see low-permeability carbonate deposits as promising for oil or gas production due to difficult development conditions. Low filtration properties require intensification to improve the permeability of the bottomhole zone, but high temperatures and pressures at depths of more than 5,000 meters require improvement of existing hydrocarbon production technologies. The high temperature of the deposits causes a rapid reaction of acidic solutions with the rock [3], which leads to the formation of deep cavities in the bottomhole zone of the formation, the solution cannot penetrate deep into the formation and form an extensive network of channels. The aim of research is to select effective carrier fluids for the preparation of acid solutions for the treatment of compacted high-temperature reservoirs with high carbonate content
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