Dilute iota- and kappa-Carrageenan solutions with high viscosities in high salinity brines

被引：37

作者：

Iglauer, Stefan ^{[1
]}

Wu, Yongfu ^{[1
]}

Shuler, Patrick ^{[1
]}

Tang, Yongchun ^{[1
]}

Goddard, William A., III ^{[2
]}

机构：

[1] CALTECH, Div Chem & Chem Engn, PEER Ctr, Covina, CA 91722 USA

[2] CALTECH, Div Chem & Chem Engn, Mat & Proc Simulat Ctr MSC, Pasadena, CA 91106 USA

来源：

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING | 2011年 / 75卷 / 3-4期

关键词：

iota- and kappa-Carrageenan; Polymer solution; High salinity; Mobility control; Shear thinning; Rheology; Gelling mechanism; Near-wellbore fluid; Fracturing fluid; LAMBDA-CARRAGEENAN; GELS; DEGRADATION; HELICES;

D O I：

10.1016/j.petrol.2010.11.025

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

We evaluated the rheological characteristics of iota- and kappa-Carrageenan in aqueous solutions. Viscosities strongly increased with increasing polymer concentration or salinity. Monovalent Na+ cations were more effective in increasing viscosity than divalent Ca2+ cations. A more complex brine containing Na+, Mg2+ and Ca2+ cations also showed high viscosities at a high salinity. We observed shear thinning behavior for these polysaccharide solutions. We explain these rheological phenomena with molecular processes, specifically the conformation change of the iota-Carrageenan from random coil to double helix. In the context of enhanced oil recovery, iota-Carrageenan solutions can reach much higher viscosities at high salinities than standard polyacrylamide solutions. Moreover. Carrageenans are renewable, nontoxic, green substances. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：304 / 311

页数：8

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