Investigation in Extremely Improved Ability of Resisting Ca2+ and Mg2+ for Alkyl Carboxylates Flooding System with Adding DSB

Chem. J. Chinese Universities

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Investigation in Extremely Improved Ability of Resisting Ca²⁺ and Mg²⁺ for Alkyl Carboxylates Flooding System with Adding DSB

XU Jun^1,2, SUN Wen-Qi³, LI Gan-Zuo¹, XU Jian¹, ZHENG Li-Qiang¹, WANG Hong-Qin², ZHANG Gao-Yong¹

1. Key Laboratory for Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, China;
2. Research Institute of Jinling Petrochemical Co., Nanjing 210046, China;
3. Institute of Theoretical Chemistry, Shandong University, Jinan 250100, China

Received:2006-05-27 Revised:1900-01-01 Online:2007-03-10 Published:2007-03-10
Contact: LI Gan-Zuo

Abstract

Abstract: The natural mixed carboxylates(abbreviated as SDC) can be used to extremely improve the ability of resisting Ca²⁺ and Mg²⁺ when adding 3-(N,N-dimethyldodecylammonio)-2-hydroxy-propanesulfonate(abbreviated as DSB). SDC and SDC-DSB flooding system are tolerant to Ca²⁺ and Mg²⁺ up to 400 mg/L and 5.0×10³ mg/L respectively. Their IFTmin are 10^-3 mN/m, and the oil recovery reach 20% by using the core flood experiment. The surface tension and the critical micelle concentrations were measured for the systems of the sodium dodecanoate and DSB. By analysis the solubility product(K_sp) of fatty acid salt, we can know that the concentration of Ca²⁺ and Mg²⁺ ions in solution is increased along with the decrease of concentration of free fatty acid group. The interaction parameter βm between sodium dodecanoate and DSB can be calculated as -3.111, which reflects more strong reaction force. The mole fraction xm1 of sodium dodecanoate in the mixed micelles is 0.51. By the software Gaussian 03, we calculated the minimum energy for compound of DSB/dodecyl acid/Ca²⁺, and obtained the charge of dominating atom in this compound. These results show there are probably many “negative-charge hole” in the surface layer of micelle, thus, the Ca²⁺ and Mg²⁺ in solution can combined in the surface layer of micelles. So we can explain why the alkyl carboxylates flooding system extremely improved the ability of resisting to Ca²⁺ and Mg²⁺ with adding DSB.

Key words: Solubility product, Micelle, Ability of resisting Ca²⁺ and Mg²⁺

CLC Number:

O647.2

TrendMD:

XU Jun^1,2, SUN Wen-Qi³, LI Gan-Zuo¹, XU Jian¹, ZHENG Li-Qiang¹, WANG Hong-Qin², ZHANG Gao-Yong¹. Investigation in Extremely Improved Ability of Resisting Ca²⁺ and Mg²⁺ for Alkyl Carboxylates Flooding System with Adding DSB[J]. Chem. J. Chinese Universities, doi: .

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Investigation in Extremely Improved Ability of Resisting Ca²⁺ and Mg²⁺ for Alkyl Carboxylates Flooding System with Adding DSB

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