1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 80th EAGE Conference and Exhibition 2018
  5. Conference paper

Abstract

Summary

Smart Water EOR is based on wettability alteration from mixed wettability to a more water-wet case, generating capillary forces and improving the microscopic sweep efficiency. The Smart Water EOR potential for a reservoir is dependent on the initial wetting state, and the EOR potential increases with decreasing water wetness.

Outcrop Stevns Klint chalk cores with reproducible properties were used in parametric studies. The influence of crude oil components, formation water composition and rock impurities on the core wettability was investigated. Spontaneous imbibition tests reflected the initial wetting of the cores prepared in different ways.

The core wettability is dependent on the acidic components in the crude oil. Higher acid number lowered the water wetness. Ion composition and salinity of the formation water also affected the initial wetting. Deionized water decreased water wetness the most, promoting adsorption of crude oil components onto chalk. Cores containing initial sulphate from impurities, behaved more water-wet than cores without sulphate. Sulphate prevented adsorption of polar crude oil components onto chalk.

Chalk wettability is influenced by all phases present in the reservoir; rock, crude oil and formation water. The chemical properties of all phases present must be considered when performing laboratory work, and evaluating reservoir wettability.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201800756
2018-06-11
2024-04-20

  • From This Site

    /content/papers/10.3997/2214-4609.201800756
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Austad, T., Strand, S., Madland, M. V., Puntervold, T. and Korsnes, R. I.
    [2008]. Seawater in chalk: An EOR and compaction fluid. SPE Reservoir Evaluation & Engineering11(4): 648–654.
     [Google Scholar]
  2. Fathi, S. J., Austad, T. and Strand, S.
    [2011]. Water-based enhanced oil recovery (EOR) by “Smart Water”: Optimal ionic composition for EOR in carbonates. Energy & Fuels25: 5173–5179.
     [Google Scholar]
  3. Hopkins, P. A., Omland, I., Layti, F., Strand, S., Puntervold, T. and Austad, T.
    [2017]. Crude oil quantity and its effect on chalk surface wetting. Energy & Fuels31: 4663–4669.
     [Google Scholar]
  4. Jadhunandan, P. P. and Morrow, N. R.
    [1991]. Spontaneous imbibition of water by crude oil/brine/rock systems. In Situ: Oil-Coal-Shale-Minerals15(4): 319–345.
     [Google Scholar]
  5. Puntervold, T., Strand, S. and Austad, T.
    [2007a]. New method to prepare outcrop chalk cores for wettability and oil recovery studies at low initial water saturation. Energy & Fuels21(6): 3425–3430.
     [Google Scholar]
  6. [2007b]. Water flooding of carbonate reservoirs: Effects of a model base and natural crude oil bases on chalk wettability. Energy & Fuels21(3): 1606–1616.
     [Google Scholar]
  7. Puntervold, T., Strand, S., Ellouz, R. and Austad, T.
    [2015]. Modified seawater as a smart EOR fluid in chalk. Journal of Petroleum Science and Engineering133: 440–443.
     [Google Scholar]
  8. Springer, N., Korsbech, U. and Aage, H. K.
    [2003]. Resistivity index measurement without the porous plate: A desaturation technique based on evaporation produces uniform water saturation profiles and more reliable results for tight North Sea chalk. Paper presented at the International Symposium of the Society of Core Analysts Pau, France, 21–24 Sept.
     [Google Scholar]
  9. Standnes, D. C. and Austad, T.
    [2000]. Wettability alteration in chalk. 1. Preparation of core material and oil properties. Journal of Petroleum Science and Engineering28(3): 111–121.
     [Google Scholar]
  10. Zhang, P., Tweheyo, M. T. and Austad, T.
    [2007]. Wettability alteration and improved oil recovery by spontaneous imbibition of seawater into chalk: Impact of the potential determining ions: Ca2+, Mg2+ and SO42−. Colloids and Surfaces A: Physicochem. Eng. Aspects301: 199–208.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201800756
Loading
Crude Oil/Brine/Rock Factors Influencing Chalk Wettability
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201800756
/content/papers/10.3997/2214-4609.201800756
/content/papers/10.3997/2214-4609.201800756
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error