RESULTS OF LABORATORY STUDIES OF ACID TREATMENT OF LOW-PERMEABILITY ROCK CORES
Soltanbekova K.A. Assilbekov B.K. Zolotukhin A.B. Akasheva Z.K. Bolysbek D.A.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#5Issue 449113 - 123 pp.
To improve production in oil and gas wells, methods of stimulating the bottomhole zone of the well have been used for a long time. One of these methods is an acid stimulation, which is currently the most widely used in the petroleum industry. This study is conducted to investigate the dissolution patterns during passing of hydrochloric acid through the core samples oflow permeability reservoir of Kazakhstani field. This paper presents the results of a series of acid treatment tests performed on 1.5-inches core samples, a description of laboratory methods, procedures and concluding remarks regarding the experiments. Six different carbonate core samples were tested. The test program consisted of several pumping experiments with hydrochloric acid solution. The initial porosity of the tested samples varied from 1.5% to 19.2%, the initial gas permeability varied from 0.009 to 85.7 m D.Experiments have determined that acid treatment was ineffective for too low permeability core samples. At low permeability values, the acid could not penetrate into the core and form “wormholes”, therefore the injection rate parameter was changed and in some cases the so-called “face” of the sample dissolution effect appeared, in which the acid affected only the surface of the core sample.From this it was concluded that the acid injection rate strongly affects the wormhole formation process.
Acid treatment , Carbonate rock , Core sample , Injection rate , Low permeability , Oil production stimulation , Wormhole formation
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Satbayev University, Almaty, Kazakhstan
National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation
Satbayev University
National University of Oil and Gas “Gubkin University”
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