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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.

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Abstract  

Thein-situ combustion technique of enhanced oil recovery may be used for the recovery of heavy oil deposits. In order to predict when this process may be used computer-based simulators are being developed. The data required by these simulators are currently available from two sources: (i) combustion tubes; these are complex, expensive and time consuming to run; (ii) thermal analysis techniques; these are fast, small-scale and relatively inexpensive. Thermal analysis literature relevant to the process is reviewed and related thermal analysis studies being conducted at Salford University are described.

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Abstract  

During recovery (production) of hydrocarbons pressure is maintained by injecting prepared sea water and recycled gas (lean gas) into dedicated injection wells. In one well at the Snorre field in the North Sea the injected gas was recycled too fast to enable support of pressure and squeezing of oil. To plug this high-permeable area the operator wanted to inject foam as a test of its possibilities to decrease gas permeability. As part of the project laboratory tests were included. In these tests we could for the first time map the foam inside the sandstone sample at simulated reservoir conditions. The tracers used were 22Na+ for the γ-scanning of the aqueous brine, tritiated water for permeability measurements, and 35S-labeled organic sulfonic acid of the same compound as the surfactant. This method resulted in a “negative” mapping of the foam, i.e. measurements of the absence or exclusion of the aqueous phase by the foam. This method was new and showed that radiotracer-based γ-scanning could give much more accurate measurements of the position of the foam than the standard method using measurements of pressure drops over parts of the core.

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Abstract  

This paper presents several applications of the PHI-TEC II that are not commonly associated with adiabatic calorimeters but which have proved to be extremely valuable. These include simulation of a deep oil well for enhanced oil recovery, isothermal calorimetry of a semibatch reaction, catalyst research using flow through reactors (both plug flow and CSTR) with controlled feeds of high pressure liquid and gas.

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Abstract  

Dodecanesulfonates (isomer mixtures) have been synthesized by the process developed in our laboratory. First, pseudoternary phase diagrams of water or (brine) decane/dodecanesulfonates-butan-1-ol systems were drawn and compared with those of a commercial sample (Hostapur 60). In the presence of NaCl, a three-phase region (Winsor III) appears for the two systems, and is larger with the home-made surfactants. This region is interesting in enhanced oil recovery because it leads to very low interfacial tensions. Then, the behavior of the Winsor III region was investigated as a function of the alcohol/surfactant mass ratio (C/T). At a constant salinity (2.5 mass% NaCl) a value of 2 for C/T gives the best compromise for a larger WIII region with both systems. For this ratio, optimal salinity values of 1.55 and 1.65 mass% for our sample and Hostapur 60, were found, respectively.

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Copolymerization. Colloid and Polymer Science JCR , v. 281, p. 19–26, 2003. MOTHÉ, C. G.; CORREIA, D. Z.; Francisca P. França. Thermal and Rheological Study of Polysaccharides for enhanced oil recovery. Journal of Thermal Analysis

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.09.007 . 22. Mothe , CG , Correia , DZ , de Franca , FFP . Thermal and rheological study of polysaccharides for enhanced oil recovery . J Therm Anal Calorim . 2006 ; 85 : 31 – 36 . 10.1007/s10973

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