Title: Kinetics of reaction between gelled HCl and dolomite Ca_1.16Mg_0.84(CO₃)₂ and filtration of gelled acid in a reservoir core sample

Authors: Oleg V. Andreev; Sergey M. Antonov; Konstantin V. Kiselev

Addresses: Institute of Chemistry, Tyumen State University, Perekopskaya str. 15a, Tyumen, 625003, Russia ' Institute of Chemistry, Tyumen State University, Perekopskaya str. 15a, Tyumen, 625003, Russia ' Institute of Chemistry, Tyumen State University, Perekopskaya str. 15a, Tyumen, 625003, Russia

Abstract: The dynamic viscosities of polyacrylamide (PA) or xanthan gum-gelled aq. HCl (12 wt %) have been determined at a temperature of 12°C and a pressure of 10 MPa. Weight loss rate curves for dolomite Ca_1.16Mg_0.84(CO₃)₂ samples exposed to gelled hydrochloric acid have been fitted by the Avrami equation; rate constants of reactions and their ratios have been determined. Quantitative characteristics of filtration have been determined for gelled HCl in the Ca_1.16Mg_0.84(CO₃)₂ carbonate reservoir core samples simulating reservoir conditions. The Damköhler numbers and filtration form of channels have been experimentally determined and calculated. [Received: February 22, 2015; Accepted: January 25, 2016]

Keywords: gelled acids; kinetic curves; acid filtration; Damkoehler number; dolomite; kinetics; reservoir core samples; dynamic viscosity; polyacrylamide; near-wellbore areas; carbonate reservoirs; hydrochloric acid; hydrocarbon fluid flow; water mineralisation; simulation.

DOI: 10.1504/IJOGCT.2017.083072

International Journal of Oil, Gas and Coal Technology, 2017 Vol.14 No.4, pp.369 - 379

Received: 23 Mar 2015
Accepted: 25 Jan 2016
Published online: 20 Mar 2017 *

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