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The Effect of Asphaltene Precipitation in Porous Media on the Relative Permeability Using FTIR SpectroscopyNormal access

Authors: J. Taheri-Shakib, M. Rajabi-Kochi, S.A. Hosseini, H. Naderi and Y. Salimidelshad
Event name: 80th EAGE Conference and Exhibition 2018
Session: Fluid Characterization Activiation
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801184
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 530.09Kb )
Price: € 20

Summary:
One of the effects of skin in oil reservoirs due to asphaltene deposition in porous media is wettability. In this study, four oil samples from a field in southwestern Iran were used to process the deposition of asphaltene in calcite reservoir rock. The measured relative permeabilities show that residual oil saturation has different values for each asphaltene sample. Based on Fourier transform infrared (FTIR) results, the asphaltene sample, which contains higher percentages of alkyl groups, carbonyl, carboxylic acid, or derivative groups, shifts the wettability changes toward oil-wetting. However, high amounts of aliphatic compounds are also present in this type of asphaltene. On the other hand, the presence of a sulfoxide group is very significant. Based on the results of this study, we can estimate the potential damage caused by their deposition in porous media in terms of wettability changes by examining the composition of asphaltene in each oil sample, and taking into account the nature of the reservoir rock.


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