Thermal and rheological study of polysaccharides for enhanced oil recovery

Department of Chemistry, Cleveland State University, Cleveland, Ohio, United States
Journal of Thermal Analysis and Calorimetry (Impact Factor: 2.21). 07/2006; 85(1). DOI: 10.1007/s10973-005-7339-7

ABSTRACT Enhanced oil recovery
process is based on the injection of chemical products (e.g. polymers, surfactants,
gases) or thermal energy (originating from the injection of e.g. steam, hot
water, in situ combustion) to recover crude oil. One of these processes use
polymer solution to mobilize the oil in the reservoir. In this work the thermal
decomposition kinetic of xanthan gum, guar gum and a blend (50/50 mass/mass%)
was studied according to Ozawa–Flynn–Wall method. According to
the kinetic analysis, the studied systems were copmpatible. The rheological
behavior of the samples was studied in distilled water and seawater at different
temperatures. Only the blend was studied in distilled water presented synergism
(enhancement in material properties like stability and viscosity) which was
confirmed through rheology.

1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: In the present work, cyclodextrins (CD) were tested as potential agents for enhanced petroleum recovery. For this purpose, wettability was evaluated through a combination of experimental measurements of the contact angle of a hydrocarbon drop (dodecane) on a quartz surface and molecular dynamics (MD) simulations. The whole system was immersed in a 0.6 M NaCl aqueous solution containing the CD. Here, the dodecane, the quartz and the NaCl solution represent the oil, the rock surface and the reservoir brine, respectively, thus mimicking the situation occurring in actual oil reservoirs. It was found that the presence of the CD in the aqueous phase consistently decreased the oil-water contact angle for the dodecane drop on quartz, indicating that the CD have an effect in displacing the hydrocarbon from the rock surface. The results show that cyclodextrins are potential candidates as additives in enhanced oil recovery. Complementary, MD calculations were performed to clarify the molecular mechanisms involved in the wettability modification due to the presence of the CD. Two different strategies were employed to determine the contact angles through MD, the first of them employing the Young-Laplace equation and the second using direct geometric measurements. The calculated contact angles were in good agreement with the experimental data. The MD results suggest that the decreased contact angles are mainly due to two effects: (i) formation of inclusion complexes between the CD and dodecane at the oil:water interface; and (ii) formation of CD monolayer on the quartz surface, resulting in a decreased surface wettability for the dodecane drop.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 03/2015; 469:42-50. DOI:10.1016/j.colsurfa.2014.12.045 · 2.35 Impact Factor
  • Source
    SPE Journal 05/2014; DOI:10.2118/169904-PA · 1.14 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The rheological properties of partially hydrolyzed polyacrylamide (HPAM) and PEO-PPO-ph-PPO-PEO (BPE) or PPO-PEO-ph-PEO-PPO (BEP) block polyether solutions are investigated here. Another hydrophobically associating polymer (HMPAM) is chosen as a contrast. The rheological results show that the elastic modulus (G′) and viscous modulus (G″) of HPAM/BPE and HPAM/BEP solutions first increase then decrease, while the viscosities of HMPAM/BPE and HMPAM/BEP solutions decrease with the increase of block polyether concentration. The HPAM/BPE solution has a larger viscosity than HPAM/BEP, while the HMPAM/BPE solution has a lower viscosity than HMPAM/BEP. The polymer solutions containing BEP have larger G′ and G″ values than the solutions with BPE. Furthermore, the block polyethers reduce the sensitivity of viscosity to temperature. BEP is more effective to stabilize the viscoelastic property and improve the temperature resistance than BPE in HMPAM system. BEP has a better property to enhance the salt tolerance of the polymer solution than BPE. Moreover, the enhanced oil recovery (EOR) experiments show that HPAM/block polyether mixed solution has a larger oil recovery than HPAM, and HPAM/BEP system has a larger enhanced effect than HPAM/BPE solution.
    Industrial & Engineering Chemistry Research 03/2014; 53(12):4544–4553. DOI:10.1021/ie404236r · 2.24 Impact Factor