Experimental research of the kinetics of the reaction of hydrochloric acid with carbonate rocks under thermobaric bed conditions

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Abstract

Interaction of acid with carbonate rocks is the basis for the processes of increasing productivity of producing wells and intensification of oil production from carbonate reservoirs. Dissolution of carbonates under conditions of filtration of acid solution through porous medium is determined by competition of chemical reaction processes and convective transfer of acid. Research on these competing processes is carried out in two main setups: a rotating carbonate disk washed by acid flow and an acid solution filtration setup through carbonate reservoir samples. The paper presents the results of such research with discussion of results and discussion of the reaction kinetics parameters on a sample of a particular field. The values of diffusion and reaction kinetics, critical rate of wormhole formation in porous medium at different concentrations of hydrochloric acid have been calculated. The values of the main dimensionless similarity complexes: Damköhler and Peckle numbers and acid solubility were estimated.

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About the authors

R. M. Ganopol’skii

FGAOU VO Tyumen State University

Author for correspondence.
Email: r.m.ganopolskij@utmn.ru
Russian Federation, Tyumen

B. R. Gil’mutdinov

OOO Irkutsk Oil Company

Email: r.m.ganopolskij@utmn.ru
Russian Federation, Irkutsk

A. V. Zhonin

ALTIM LLC

Email: r.m.ganopolskij@utmn.ru
Russian Federation, Ufa, Republic of Bashkortostan

T. M. Mukhametzyanov

ALTIM LLC

Email: r.m.ganopolskij@utmn.ru
Russian Federation, Ufa, Republic of Bashkortostan

K. M. Fedorov

FGAOU VO Tyumen State University

Email: k.m.fedorov@utmn.ru
Russian Federation, Tyumen

A. E. Folomeev

OOO Irkutsk Oil Company

Email: r.m.ganopolskij@utmn.ru
Russian Federation, Irkutsk

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Supplementary files

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2. Fig. 1. Computer tomography of acid pumping through a carbonate core sample of rock: (a) frontal mode; (b) through wormhole; (c) volumetric mode [3]. The main modes of carbonate leaching are visible in the photographs of X-ray transmission of the samples. Acid movement from top to bottom.

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3. Fig. 2. Photograph of the setup (a) and schematic diagram of the reactor (b) for studying the kinetics of dissolution of a rotating carbonate disk.

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4. Fig. 3. Photograph of the installation for studying single-phase filtration PIK AP-3000.

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5. Fig. 4. Experimental dependence of the reaction rate on the angular velocity of rotation of the dolomite disk (a) and theoretical curve (b) for carbonates. J is the specific dissolution rate, μmol/(cm2∙s), W is the angular velocity of rotation of the disk, rad/s.

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6. Fig. 5. Configuration of the reacting surface of a dolomite disk at different angular velocity rates (rpm). Three ranges of rates are distinguished: fully corresponding to Levich's theory (+), the influence of boundary conditions (+/–) and corresponding to the turbulent regime (?), in which theoretical assumptions are invalid.

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7. Fig. 6. Results of filtration experiments to determine the dependence of the pumping volume before breakthrough, normalized to the pore volume, on the injection rate for selected concentrations of hydrochloric acid.

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