Quantitative Analysis of Reaction-Rate Retardation in Surfactant-Based Acids
- Hisham A. Nasr-El-Din (Texas A&M University) | Abdullah M. Al-Mohammed (Saudi Aramco) | Ali D. Al-Aamri (Saudi Aramco) | Musaed A. Al-Fahad (Saudi Aramco) | Frank F. Chang (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- February 2009
- Document Type
- Journal Paper
- 107 - 116
- 2009. Society of Petroleum Engineers
- 2.5.2 Fracturing Materials (Fluids, Proppant), 3 Production and Well Operations, 2.4.3 Sand/Solids Control, 4.2.3 Materials and Corrosion, 1.8 Formation Damage, 2 Well Completion, 5.8.7 Carbonate Reservoir, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 4.3.4 Scale, 1.2.3 Rock properties, 4.1.2 Separation and Treating, 2.2.2 Perforating, 3.2.4 Acidising
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- 926 since 2007
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Fracture acidizing has been a dominant practice in the industry to enhance well productivity in low-permeability carbonate reservoirs. Many acid systems have been developed to improve this stimulation process. The most desirable characteristics for an acid system to be suitable for fracture acidizing are leakoff control and retarded reaction rate. These characteristics are required for deep acid penetration, so that when the fracture closes, long flow channels are etched on the fracture surfaces. Leakoff control can be achieved by pumping a pad containing a viscosifying agent or solid bridging agents to plug wormholes generated by acid dissolution. Reaction retardation is attempted usually by lowering the effective diffusivity of the hydrogen ion.
It is well known that during an acid-fracturing operation, the overall reaction rate of hydrochloric acid (HCl) with limestone is mass-transfer-limited. Designing the treatment requires knowing the effective diffusivity of the hydrogen ion in the acid system, which, to the best of the authors' knowledge, has not been determined before. Because of their combined leakoff-control and retardation capabilities, surfactant-based acids have been used in acid-fracturing treatments. Because more carbonate reservoirs are treated by use of this acid system, it is important to obtain the effective diffusivity of H+.
The rotating-disk device has been used to investigate the reaction kinetics between a reactive solution and carbonate rocks because the thickness of the boundary layer is uniform throughout the disk surface. This paper discusses the reaction-rate data generated recently for surfactant-based acid by use of a rotating-disk apparatus and presents the methodology used to determine the effective diffusivity from the measurements.
The results obtained indicated that the viscoelastic surfactant examined (carboxybetaine-type) reduced the dissolution rate of calcite with HCl acid. The surfactant reduced the diffusion coefficient for H+. The effect of temperature on the diffusion coefficient did not follow the Arrhenius law.
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Alkattan, M., Oelkers, E., Dandurand, J-L., and Schott, J. 1998. An experimental study ofcalcite and limestone dissolution rates as a function of pH from -1 to 3 andtemperature from 25 to 80°C. Chemical Geology 151(1-4): 199-214. DOI:10.1016/S0009-2541(98)00080-1.
Alkattan, M., Oelkers, E., Dandurand, J-L., and Schott, J. 2002. An experimental study ofcalcite dissolution rates at acidic conditions and 25°C in the presence ofNaPO3 and MgCl2. Chemical Geology190 (1-4): 291-302. DOI:10.1016/S0009-2541(02)00121-3.
Al-Khaldi, M., Nasr-El-Din, H.A., Metha, S., and Aamri A. 2007. Reaction of citric acid withcalcite. Chem. Eng. Sci. 62 (21): 5880-5896.DOI:10.1016/j.ces.2007.06.021.
Al-Mohammad, A.M., Nasr-El-Din, H.A., Al-Aamri, A.M., and Al-Fuwaires, O.2006. Reaction of Calcite withSurfactant-Based Acids. Paper SPE 102838 presented at the SPE AnnualTechnical Conference and Exhibition, San Antonio, Texas, USA, 24-27 September.DOI: 10.2118/102838-MS.
Conway, M.W., Asadi, M., Penny, G., and Chang, F. 1999. A Comparative Study ofStraight/Gelled/Emulsified Hydrochloric Acid Diffusivity Coefficient UsingDiaphragm Cell and Rotating Disk. Paper SPE 56532 presented at the SPEAnnual Technical Conference and Exhibition, Houston, 3-6 October. DOI:10.2118/56532-MS.
de Rozieres, J., Chang, F.F., and Sullivan, R.B. 1994. Measuring Diffusion Coefficients inAcid Fracturing Fluids and Their Application to Gelled and EmulsifiedAcids. Paper SPE 28552 presented at the SPE Annual Technical Conference andExhibition, New Orleans, 25-28 September. DOI: 10.2118/28552-MS.
Fredd, C.N. 1998. The Influence of Transport and Reaction on WormholeFormation in Carbonate Porous Media: A Study of Alternative Stimulation Fluids.PhD thesis, University of Michigan, Ann Arbor, Michigan.
Fredd, C.N. and Fogler, H.S. 1998a. The kinetics of calcitedissolution in acetic acid solutions. Chem. Eng. Sci.53 (22): 3863-3874. DOI:10.1016/S0009-2509(98)00192-4.
Fredd, C.N. and Fogler, H.S. 1998b. Alternative Stimulation Fluids andtheir Impact on Carbonate Acidizing. SPE J. 3 (1):34-41. SPE-31074-PA. DOI: 10.2118/31074-PA.
Fredd, C.N. and Fogler, H.S. 1998c. The influence of chelatingagents on the kinetics of calcite dissolution. J. Colloid InterfaceScience 204 (1): 187-197. DOI:10.1006/jcis.1998.5535.
Frenier, W.W. and Hill, D.G. 2002. Effect of Acidizing Additives onFormation Permeability During Matrix Treatments. Paper SPE 73705 presentedat the International Symposium and Exhibition on Formation Damage Control,Lafayette, Louisiana, USA, 20-21 February. DOI: 10.2118/73705-MS.
Fu, D. and Chang, F. 2005. Compositions and methods for treating asubterranean formation. US Patent No. 6,929,070.
Gautelier, M., Oelkers, E., and Schott, J. 1999. An experimental study ofdolomite dissolution rates as a function of pH from -0.5 and temperature from25 to 80°C. Chemical Geology 157 (1-2) 13-26.DOI:10.1016/S0009-2541(98)00193-4.
Gdanski, R. and Van Domelen, M.S. 1999. Slaying the Myth of InfiniteReactivity of Carbonates. Paper SPE 50730 presented at the SPEInternational Symposium on Oilfield Chemistry, Houston, 16-19 February. DOI:10.2118/50730-MS.
Hansford, G.S. and Litt, M. 1968. Mass transport from arotating disk into power-law liquids. Chem. Eng. Sci.23 (8): 849-864. DOI:10.1016/0009-2509(68)80020-X.
Levich, V.G. 1962. Physicochemical Hydrodynamics, 78. EnglewoodCliffs, New Jersey: Prentice-Hall Inc.
Lund, K., Fogler, H.S., McCune, C.C., and Ault, J.W. 1975. Acidization--II. Thedissolution of calcite in hydrochloric acid. Chem. Eng. Sci.30 (8): 825-835. DOI:10.1016/0009-2509(75)80047-9.
Nasr-El-Din, H.A., Al-Ghamdi, A.W.H., Al-Qahtani, A.A., and Samuel, M.M.2008a. Impact of Acid Additives onthe Rheological Properties of a Viscoelastic Surfactant and Their Influence onField Application. SPE J. 13 (1): 35-47. SPE-89418-PA.DOI: 10.2118/89418-PA.
Nasr-El-Din, H.A., Al-Mohammad, A., Al-Aamri, A., and Al-Fuwaires, O. 2008b.Reaction of Gelled Acids WithCalcite. SPE Prod & Oper 23 (3): 353-361.SPE-103979-PA. DOI: 10.2118/103979-PA.
Roberts, L.D. and Guin, J.A. 1974. The Effect of Surface Kinetics inFracture Acidizing. SPE J. 14 (4): 385-395;Trans., AIME, 257. SPE-4349-PA. DOI: 10.2118/4349-PA.
Taylor, K.C., Al-Ghamdi, A.H., and Nasr-El-Din, H.A. 2004a. Effect of Additives on the AcidDissolution Rates of Calcium and Magnesium Carbonates. SPE J.19 (3): 122-127. SPE-80256-PA. DOI: 10.2118/80256-PA.
Taylor, K.C., Al-Ghamdi, A.H., and Nasr-El-Din, H.A. 2004b. Measurement ofAcid Reaction Rates of a Deep Dolomitic Gas Reservoir. J. Cdn. Pet.Tech. 43 (10): 49-56.
Taylor, K.C., Nasr-El-Din, H.A., and Mehta, S. 2006. Anomalous Acid Reaction Rates inCarbonate Reservoir Rock. SPE J. 11 (4): 488-496.SPE-89417-PA. DOI: 10.2118/89417-PA.