Effect of initial wettability on performance of smart water flooding in carbonate reservoirs-an experimental investigation with IOR implications

Kholood Al-Nofli, Peyman Pourafshary, Nader Mosavat, Ali Shafiei

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this paper, the effects of salinity and active ions on wettability alteration in carbonate reservoirs with different initial wettability conditions with implications in smart water flood design, optimization, and performance analysis are experimentally investigated. Contact angle measurement was used as the main tool to study the alteration in wettability. Other analytical techniques such as pH measurements along with energy-dispersive X-ray spectroscopy (EDS) were used to support the analysis. Initial wettability of the tested carbonate samples ranges from strongly water wet to preferentially water wet, neutral wet, oil wet, and strongly oil wet (5 cases or groups) condition. Four different synthetic brines, namely high salinity (Hsal), low salinity (Lsal), and smart waters 1 and 2 (SW1 = a Mg brine, and SW2 = a Mg and sulfate brine) were prepared and used by adjusting the salinity and ion concentration to study their effects on wettability alteration. Low-salinity brine (Lsal) proved to be more effective than high-salinity brine (Hsal) for the wettability alteration of calcite surfaces at intermediate (neutral) or oil-wet conditions. The smart brine containing only the Mg2+ ion (SW1) was able to alter the wettability of calcite surfaces in intermediate or oil-wet states. The sulfate ion played a catalytic role in wettability alteration by the magnesium ion, and the process was faster, as indicated by higher wettability alteration index values. High-salinity brine (Hsal) is a good choice for design of water floods in reservoir rocks with initial wettability in the range of strongly water wet to neutral wet conditions. In the wettability alteration process of oil-wet samples, brine with a high magnesium ion concentration was slower than brine containing high concentrations of both magnesium and sulfate ions. This can be attributed to the catalytic role of the sulfate ion compared to that of the magnesium ion. Finally, the results showed that the initial wettability of the reservoir rock plays a major role in design of a proper water flood to maximize oil recovery from carbonate reservoirs. The results obtained from this research work suggests that some effective smart water flooding scenarios can be developed and executed incorporating different smart brines to manage the reservoir rock wettability and maximize the oil recovery from carbonate oil reservoirs.

Original languageEnglish
Article number1394
JournalEnergies
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 1 2018

Fingerprint

Wettability
Flooding
Experimental Investigation
Wetting
Carbonates
Water
Salinity
Ions
Magnesium
Brines
Rocks
Calcite
Recovery
Maximise
X-ray Spectroscopy
Oils
Contact Angle
Angle measurement
Range of data
Contact angle

Keywords

  • Carbonate reservoirs
  • Improved oil recovery
  • Low-salinity water flooding
  • Multi ion exchange
  • Smart water flooding
  • Wettability
  • Wettability alteration

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this

Effect of initial wettability on performance of smart water flooding in carbonate reservoirs-an experimental investigation with IOR implications. / Al-Nofli, Kholood; Pourafshary, Peyman; Mosavat, Nader; Shafiei, Ali.

In: Energies, Vol. 11, No. 6, 1394, 01.06.2018.

Research output: Contribution to journalArticle

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KW - Carbonate reservoirs

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