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Experimental study of Carbonate Rocks dissolution rate acid fracturing fluids

Authors: V.G. Salimov, R.R. Ibatullin, A.V. Nasybullin, O.V. Salimov (TatNIPIneft, RF, Bugulma), P. Kasza, M. Czupski (Oil and Gas Institute, the Republic of Poland, Krakov)
E-mail: salimov@tatnipi.ru
Key words: hydrofracturing, carbonate rocks, acid fluid, rotating disk,
diffusion, dissolution rate.

Diffusion coefficient for the reaction of carbonate rocks dissolution in acidfracturing fluids was measured using rotating disc. Four types of fracturing fluidsand two types of carbonate rocks were used. It has been found that forall available speeds of the apparatus, the reaction rate increases with increaseof angular rate of the disc, therewith, predominant dissolution of calciterather than dolomite takes place. It has been demonstrated that at highfracturing pressure, the diffusion is almost insensitive to Neftenol K added tothe acid solution, while in the Chevron-Phillips fracturing fluid the diffusion decreasesby one-two orders of magnitude, and in acid-oil emulsion fluid it decreasesby three orders of magnitude. The measurements’ results were enteredinto the MFrac acid base.

References
1. Rozieres J. et al., Measuring diffusion coefficients in acid fracturing fluids
and their application to gelled and emulsified acids, Paper SPE 28552.
2. Anderson M.S., Reactivity of San Andres dolomite, Paper SPE 20115.
3. Taylor K.C., Nasr-El-Din H.A., Measurement of acid reaction rates with the rotatingdisk apparatus, Paper SPE 2007-015.
4. Taylor K.C. et al., Measurement of acid reaction rates of a deep dolomiticgas reservoir, JCPT, October 2004, V. 43, no. 10, pp. 49-56.
5. Lund K. et al., Acidization-II. The dissolution of calcite in hydrochloric acid,Chem. Eng. Sci., 1975, no. 30, pp. 825-835.
6. Hoefner M.L. et al., Role of acid diffusion in matrix acidizing of carbonates,JPT, February 1987, pp. 203-208.
7. Stilbs P., Moseley M.E., Multicomponent self-diffusion measurement by the
pulsed gradient spin-echo method on standard Fourier transform NMR pectrometers,Chem. Scripta, 1980, no. 15, 176 p.
8. Levich V.G., Fiziko-khimicheskaya gidrodinamika (Physical and chemical
hydrodynamics), Moscow: Gos. Izd. fiziko-matematicheskoy literatury Publ.,1959, 699 p.
9. Hansford G.S., Litt M., Mass transport from a rotating disk into power law liquids,Chem. Eng. Sci., 1968, no. 23, pp. 849-864.
10. Plummer L.N., Busenberg E., The kinetics of dissolution of dolomite in CO2 –
H2O systems at 1,5 to 65°C and 0 to 1 atm PCO2, Amer. Jour. of Sci, 1982,V. 282, pp. 45-78.
E-mail: salimov@tatnipi.ru
Key words: hydrofracturing, carbonate rocks, acid fluid, rotating disk,
diffusion, dissolution rate.

Diffusion coefficient for the reaction of carbonate rocks dissolution in acidfracturing fluids was measured using rotating disc. Four types of fracturing fluidsand two types of carbonate rocks were used. It has been found that forall available speeds of the apparatus, the reaction rate increases with increaseof angular rate of the disc, therewith, predominant dissolution of calciterather than dolomite takes place. It has been demonstrated that at highfracturing pressure, the diffusion is almost insensitive to Neftenol K added tothe acid solution, while in the Chevron-Phillips fracturing fluid the diffusion decreasesby one-two orders of magnitude, and in acid-oil emulsion fluid it decreasesby three orders of magnitude. The measurements’ results were enteredinto the MFrac acid base.

References
1. Rozieres J. et al., Measuring diffusion coefficients in acid fracturing fluids
and their application to gelled and emulsified acids, Paper SPE 28552.
2. Anderson M.S., Reactivity of San Andres dolomite, Paper SPE 20115.
3. Taylor K.C., Nasr-El-Din H.A., Measurement of acid reaction rates with the rotatingdisk apparatus, Paper SPE 2007-015.
4. Taylor K.C. et al., Measurement of acid reaction rates of a deep dolomiticgas reservoir, JCPT, October 2004, V. 43, no. 10, pp. 49-56.
5. Lund K. et al., Acidization-II. The dissolution of calcite in hydrochloric acid,Chem. Eng. Sci., 1975, no. 30, pp. 825-835.
6. Hoefner M.L. et al., Role of acid diffusion in matrix acidizing of carbonates,JPT, February 1987, pp. 203-208.
7. Stilbs P., Moseley M.E., Multicomponent self-diffusion measurement by the
pulsed gradient spin-echo method on standard Fourier transform NMR pectrometers,Chem. Scripta, 1980, no. 15, 176 p.
8. Levich V.G., Fiziko-khimicheskaya gidrodinamika (Physical and chemical
hydrodynamics), Moscow: Gos. Izd. fiziko-matematicheskoy literatury Publ.,1959, 699 p.
9. Hansford G.S., Litt M., Mass transport from a rotating disk into power law liquids,Chem. Eng. Sci., 1968, no. 23, pp. 849-864.
10. Plummer L.N., Busenberg E., The kinetics of dissolution of dolomite in CO2 –
H2O systems at 1,5 to 65°C and 0 to 1 atm PCO2, Amer. Jour. of Sci, 1982,V. 282, pp. 45-78.


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