Int. J. of Oil, Gas and Coal Technology   »   2017 Vol.14, No.4

 

 

Title: Kinetics of reaction between gelled HCl and dolomite Ca1.16Mg0.84(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 Ca1.16Mg0.84(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 Ca1.16Mg0.84(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.2017.10004001

 

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

 

Available online: 20 Mar 2017

 

 

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