Abstract
Background In the process of extracting oil from carbonate reservoirs, the permeability of the bottomhole formation zone (BFZ) strata decreases. The deterioration is due to the hydromechanical contamination of the filtering surface of the BFZ by mechanical impurities and hydrocarbon compounds, insoluble deposits, the loss of inorganic salts, the quality of opening of the productive layer, the increase in the saturation of BFZ and the decrease in phase permeability for oil. In order to increase the permeability of BFZ strata, various methods are used: mechanical, chemical and thermal. For carbonate collectors, the treatment of the BFZ with hydrochloric acid is one of the main methods for the intensification of oil production. The priority for the treatment of watered carbonate reservoirs is the creation of highly permeable channels with a wormhole structure. A large number of theoretical and experimental studies are devoted to the determination of parameters of effective acid exposure and the creation of conditions for wormholes formation in the carbonate reservoir. In recent years, acid thickeners are used to increase the acid treatment efficiency of fractured reservoirs. Increasing acidic solution viscosity allows increasing the penetration depth of the acid in the strata in the active state, thus forming channels of filtration of different geometry, which improve the permeability coefficient of BFZ. Aims and Objectives To carry out a comparative analysis of the acid exposure effectiveness with the use of acidic solutions thickeners and without thickeners. Estimate of the thickened acid filtration capacity in the strata and its dissolving ability according to the increase in the permeability coefficient of the sample from the Seboruko carbonate formation (Republic of Cuba). Results According to the research results, the increase in the permeability coefficient of the strata sample was determined when exposed to a traditional acid solution and thickened. The geometry of the formed dissolution channels was determined. Under the action of a conventional acid, a conical shape channel with low branching was formed, and when a thickened acid was applied to the sample, a branched channel formed with a wormhole geometry. Thus, this study shows that the treatment efficiency of carbonate formations increases with the addition of thickeners to acidic solutions. Thickeners increase the viscosity of the acidic solution, reducing the rate of acid reaction with carbonate minerals.
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