Kinetics of Chemical Reaction between Surface Cross -Linked Acid and Limestone from Syria
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    Abstract:

    The reaction kinetic experiments between a surface cross-linked acid and Syria limestone were conducted by using a rotating disc at temperatures of 60℃,90℃,120℃and 150℃. Reaction kinetic equations were deduced to demonstrate the reaction characteristics of surface cross-link acid and limestone from target layer of Syria at corresponding temperatures. The results indicated that experiment temperature was an important influence factor on the reaction rate. The higher temperature ,the faster reaction was. Corresponding reacting rate constant of the acid and limestone were 5.68× 10-8(mol/L)-1.51/(cm2·s)、1.94× 10-7(mol/L)-1.03/(cm2·s)、2.76× 10-7(mol/L)-0.72/(cm2·s)和1.62× 10-6(mol/L)-0.42/(cm2·s),and the reacting orders were 1.51,1.03,0.72 and 0.42respectively at above temperatures. The reacting rate constant of surface cross-link acid was smaller about 1 order of magnitude than that of conventional gelling acid at60℃,and 2 order of magnitude at120℃compared with earlier experiment results ,which showed the better retarding performance. Therefore ,the surface cross-linked acid possessed the advantages of acid fracturing stimulation in high temperature deep well of carbonate reservoirs in aspect of increasing the effective acid-etched distance.

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JIANG Rui, JIANG Jianfang, WU Chuan, ZHANG Zuguo, ZHANG Rusheng, LIU Guangpu, LI Long, GAO Xiang. Kinetics of Chemical Reaction between Surface Cross -Linked Acid and Limestone from Syria[J]. OILFIELD CHEMISTRY,2015,32(3):328-331.

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  • Online: October 15,2015
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