Physico-Chemical and Rheological Properties of Gellan in Aqueous-Salt Solutions and Oilfield Saline Water

Physico-Chemical and Rheological Properties of Gellan in Aqueous-Salt Solutions and Oilfield Saline Water

Summary The physico‐chemical and rheological properties of low acyl gellan (LAG) were investigated in aqueous solutions of various salts. 1H NMR spectroscopic study of LAG was conducted in salt‐free solutions at different temperatures. FTIR spectra revealed that the characteristic bands of both asym...

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Bibliographic Details
Published in:Macromolecular symposia. Vol. 363; no. 1; pp. 20 - 35
Main Authors: Kudaibergenov, Sarkyt E., Tatykhanova, Gulnur S., Sigitov, Vladimir B., Nurakhmetova, Zhanar A., Blagikh, Eugene V., Gussenov, Iskander Sh, Seilkhanov, Tulegen M.
Format: Journal Article
Language:English
Published: Weinheim Blackwell Publishing Ltd 01-05-2016
Wiley Subscription Services, Inc
Subjects:
Alkaline earth metals
Aqueous solutions
Band spectra
Bentonite
Cations
Clay minerals
Compression
Computer simulation
Divalent cations
Drilling
Drilling muds
Enhanced oil recovery
Gelation
gellan
Gellan gum
Gels
Mathematical models
Mechanical properties
Mechanical stimuli
Minerals
Modules
NMR
Nuclear magnetic resonance
Oil field equipment
Permeability
Phase transitions
Plastics
Potassium chloride
Reservoirs
Rheological properties
Rheology
Saline water
Salt water
Salts
Sand
Shear stress
Sodium chloride
Sol gel process
sol-gel transition
Solid phases
Spectroscopic analysis
Viscosity
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Summary:Summary The physico‐chemical and rheological properties of low acyl gellan (LAG) were investigated in aqueous solutions of various salts. 1H NMR spectroscopic study of LAG was conducted in salt‐free solutions at different temperatures. FTIR spectra revealed that the characteristic bands of both asymmetric and symmetric carboxylate groups are shifted to higher frequency regions as a result of effective surrounding of glucuronate residuesby mono‐ and divalent cations of salts. According to viscometricresults the effectiveness of salts to enhance gelation of gellan changes in the following order: BaCl2 > CaCl2 ≈ MgCl2 > KCl > NaCl. The behavior of LAG in model aqueous‐salt solutions and real oilfield saline water was evaluated by means of rheological measurements.The shear rate (and effective viscosity) of 0.5 wt.% gellan solution versus shear stress increases (and decreases) in the sequence of CaCl2 > MgCl2 > KCl > NaCl demonstrating the pseudo plastic character. The sol‐gel and liquid‐solid phase transitions of gellan solutionswere observed upon addition of oilfield water containing 73 g · L−1 of alkaline and alkaline earth metal ions. The effectiveness of salts to induce the separation of liquid and solid phases changes in the sequence: NaCl > KCl > MgCl2 ≈ CaCl2 ≈ BaCl2. The mechanical properties of gellan gels under compression were studied and the Young modules and breaking stresses were found. Sol‐gel transition of gellan solution inside of sand pack model was demonstrated. The hydrodynamic behavior of 0.5 wt.% gellan solution injected into the sand pack model with high (20 d) and low (2 d) permeability is useful to model the oil reservoirs in the process of enhanced oil recovery. The influence of clay minerals – bentonite on the rheological characteristics of gellan solution was evaluated for simulation of drilling mud ability to carry up the drilled rock particles from the bottomhole of the well to the surface.
Bibliography:istex:EB22708E869FBB5BCF74E5C790D6A4367A397801
Ministry of Education and Science - No. 4410/GF4 2015-2017
ArticleID:MASY201500139
ark:/67375/WNG-QF76XFGD-1
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.201500139