The displacement efficiency and rheology of welan gum for enhanced heavy oil recovery

Xu, Long; Xu, Guiying; Yu, Long; Gong, Hongyu; Dong, Mingzhe; Li, Yajun

doi:10.1002/pat.3364

Cited by 58 publications

(37 citation statements)

References 36 publications

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“…This correlates to the upper limit of water salinity observed for XG and Aps compared to HPAMs (Table 3). In terms of oil viscosity, the range presented in Table 3 for XG seems to be limited, because other laboratory studies have used XG to displace heavy oils with viscosities of > 450 cP [136,137]. It is also interesting to realize that the highest limit of temperature tested is 248 • F (120 • C), which might indicate that this would be the maximum temperature to ensure the thermal stability of polymers (recall Section 3.2.2).…”

Section: Lab-scale Polymer-flooding Testingmentioning

confidence: 99%

Evaluation of Polymeric Materials for Chemical Enhanced Oil Recovery

2020

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Polymer flooding is a promising enhanced oil recovery (EOR) technique; sweeping a reservoir with a dilute polymer solution can significantly improve the overall oil recovery. In this overview, polymeric materials for enhanced oil recovery are described in general terms, with specific emphasis on desirable characteristics for the application. Application-specific properties should be considered when selecting or developing polymers for enhanced oil recovery and should be carefully evaluated. Characterization techniques should be informed by current best practices; several are described herein. Evaluation of fundamental polymer properties (including polymer composition, microstructure, and molecular weight averages); resistance to shear/thermal/chemical degradation; and salinity/hardness compatibility are discussed. Finally, evaluation techniques to establish the polymer flooding performance of candidate EOR materials are described.

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Section: Lab-scale Polymer-flooding Testingmentioning

confidence: 99%

Evaluation of Polymeric Materials for Chemical Enhanced Oil Recovery

2020

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“…In order to study the stability of the biopolymers over the time when subjected to shear rates representative of oil reservoirs, thixotropic studies were performed according to the methodology proposed in [12]. Purified R. viscosum CECT 908 biopolymer and xanthan gum (both at 2 g/L) were exposed to a constant shear rate (7.3 s −1 ) at 40°C for 2 h. The shear rate used was selected according to similar literature reports as being representative of oil reservoir conditions [4,9,12,31,32]. In order to prevent evaporation of the samples during the assays, their outer surface was covered with silicon oil.…”

Section: Rheological Properties and Stabilitymentioning

confidence: 99%

“…Water-soluble polymers are used to increase the viscosity of the injected water, reducing the mobility ratio of water relative to crude oil inside the reservoir; this results in the formation of a uniform oil displacement front, facilitating the mobilization of the residual oil and improving the overall sweep efficiency of water flooding. Several studies (including laboratory and field assays) demonstrated that polymer flooding can increase oil recovery by 20% over water flooding [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…A variety of microorganisms produce biopolymers useful for application in MEOR, including species belonging to the genera Alcaligenes, Aureobasidium, Bacillus, Leuconostoc, Pseudomonas, Sphingomonas and Xanthomonas [1,4,12,[20][21][22][23][24]. Among these biopolymers, xanthan gum, produced by the bacterium Xanthomonas campestris, stands out.…”

Section: Introductionmentioning

confidence: 99%

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The biopolymer produced by Rhizobium viscosum CECT 908 is a promising agent for application in microbial enhanced oil recovery

et al. 2019

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Polymer flooding is one of the most promising techniques used to increase the productivity of mature oil reservoirs. Polymers reduce the mobility ratio of the injected water relative to the crude oil, improving the displacement of the entrapped oil and consequently, increasing oil recovery. Biopolymers such as xanthan gum have emerged as environmentally friendly alternatives to the chemical polymers commonly employed by the oil industry. However, in order to seek more efficient biomolecules, alternative biopolymers must be studied. Here, the applicability of a biopolymer produced by Rhizobium viscosum CECT 908 in Microbial Enhanced Oil Recovery (MEOR) was evaluated. This biopolymer exhibited better rheological properties (including higher viscosity) when compared with xanthan gum. Its stability at high shear rates (up to 300 s −1), temperatures (up to 80°C) and salinities (up to 200 g/L of NaCl) was also demonstrated. The biopolymer exhibited better performance than xanthan gum in oil recovery assays performed with a heavy crude oil, achieving 25.7 ± 0.5% of additional recovery. Thus the R. viscosum CECT 908 biopolymer is a promising candidate for application in MEOR.

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“…In addition, the welan gum has good performance at high temperature, which ensures its application in mass concrete. The delayed action of welan gum on cement hydration can be used to adjust the setting time of rapidly solidified cementitious material and rapidly hydrated mineral phase.…”

Section: Introductionmentioning

confidence: 99%

Impact of Welan Gum on Cement Paste Containing PCE Superplasticizers with Different Charge Densities

Wang

et al. 2019

ChemistrySelect

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As a renewable materials, welan gum is microbial biopolymer which is fermented by bacteria. It is widely used in self‐compacting concrete because of its excellent rheological properties. After adding welan gum, the fluidity of cement will decrease rapidly. So it needs to be used together with superplasticizer. Two polycarboxylate superplasticizer with the acid/ether radio of 2 (PC‐2)and with the acid/ether radio of 6 (PC‐6)were synthesized. By FTIR measurements, carboxyl functional groups exists in the dialysed polymer. The specific anionic charge density measurement shows that PC‐6 provide more COO− than PC‐2 in alkaline solution. And TOC test analysis shows that the adsorbed amount of PC‐6 is higher than PC‐2 with low anionic charge density. PC‐6 with the higher COO− seems to be more affected by welan gum than PC‐2. From the rheological properties of cement paste mixed with PCEs and welan gum, it can be concluded that the addition of welan gum aggravates the trend of shear thickening. Hydration heat flow at different temperatures indicates the selected welan gum is capable of retarding early cement hydration even in high temperatures. Finally, the film forming property of the welan gum was initially studied through water loss rate test, and the film formation mechanism needs to be studied in the future.

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The displacement efficiency and rheology of welan gum for enhanced heavy oil recovery

Cited by 58 publications

References 36 publications

Evaluation of Polymeric Materials for Chemical Enhanced Oil Recovery

Evaluation of Polymeric Materials for Chemical Enhanced Oil Recovery

The biopolymer produced by Rhizobium viscosum CECT 908 is a promising agent for application in microbial enhanced oil recovery

Impact of Welan Gum on Cement Paste Containing PCE Superplasticizers with Different Charge Densities

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