Experimental Investigation of Potential of Combined Controlled Salinity and Bio-Surfactant CSBS in Enhanced Oil Recovery EOR Processes
- Tinuola Udoh (University of Aberdeen) | Lateef Akanji (University of Aberdeen) | Jan Vinogradov (University of Aberdeen)
- Document ID
- Society of Petroleum Engineers
- SPE Nigeria Annual International Conference and Exhibition, 6-8 August, Lagos, Nigeria
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 10 in the last 30 days
- 128 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 28.00|
In this study, we investigate potential application of environment-friendly bio-surfactants (EFBS) in EOR processes. We assess the prospect of combining the EFBS with controlled salinity (CS) water injection in optimising oil recovery using rhamnolipid and protein-enzyme as case study. Rock component analysis, bio-surfactant solubility in brine of varied concentration and composition, crude oil-brine interfacial tension (IFT) and bio-surfactants emulsification activity test were carried out as part of the preliminary investigations. Following these preliminary analyses, a series of comprehensive core flooding displacement experiments were used to investigate the EOR potential of CSBS injection process. Finally, effluent analyses were conducted to study the effect of this combined process on dynamic oil-brine-rock interactions. Results of the IFT tests using 0.0083-3M brine concentrations show IFT reduction from 3.40-2.5 mN/m with increasing salinity for protein-enzyme while increase in IFT from 0.11-0.34mN/m was observed with increasing salinity for rhamnolipid. However, using a fixed brine concentration of 8.3mM with varied bio-surfactant concentration, IFT reduction with increase in concentration was observed for both of them. Also, the two bio-surfactants exhibited stable emulsion active in varied brine salinity investigated. Protein-enzyme is soluble in varied brine formulation while rhamnolipid solubility was found to be dependent on the brine composition and system pH rather than the ionic strength. Furthermore, from the secondary injection of CS and CSBS, the highest recovery factor of 82.76% was achieved with CSBS (protein-enzyme). However, in the tertiary applications, the highest recovery of 83.40% was achieved in the CS injection. Finally, increased pH, Ca2+ and Mg2+ concentrations was observed with both CS and CSBS flooding. This suggests reaction between excess cations and previously adsorbed carboxylic group of crude-oil led to increased recovery. Whereas, at residual oil saturation, interaction between bio-surfactant molecules and rock surface resulted in increased water-wetness and release of oil.
|File Size||1 MB||Number of Pages||22|
H. H. Al-Attar, M. Y. Mahmoud, A. Y. Zekri, R. Almehaideb, and M. Ghannam. Low-salinity flooding in a selected carbonate reservoir: experimental approach. Journal of Petroleum Exploration and Production Technology, 3(2):139–149, Jun 2013. ISSN 2190-0566. Doi: 10.1007/s13202-013-0052-3. URL https://doi.org/10.1007/s13202-013-0052-3.
D. Ligthelm, J. Gronsveld, J. Hofman, N. Brussee, F. Marcelis, and H. Van Der Linde. Novel waterflooding strategy by manipulation of injection brine composition (spe-119835). In 71st European Association of Geoscientists and Engineers Conference and Exhibition 2009: Balancing Global Resources. Incorporating SPE EUROPEC 2009, volume 2, pages 1313–1335, 2009. Cited By: 1.
O. Pornsunthorntawee, N. Arttaweeporn, S. Paisanjit, P. Somboonthanate, M. Abe, R. Rujiravanit, and S. Chavadej. Isolation and comparison of biosurfactants produced by bacillus subtilis pt2 and pseudomonas aeruginosa sp4 for microbial surfactant-enhanced oil recovery. Biochemical engineering journal, 42(2):172–179, 2008. Cited By: 44.
D. Gogoi, P. Bhagowati, P. Gogoi, N. K Bordoloi, A. Rafay, S. K Dolui, and gA. K Mukherjee. Structural and physicochemical characterization of a dirhamnolipid biosurfactant purified from pseudomonas aeruginosa: application of crude biosurfactant in enhanced oil recovery. RSC Advalnces, 6(74):70669–70681, 2016.