1887

Abstract

Summary

The wettability behavior of the matrix block is one of the major factors controlling the effectiveness of the employed EOR methods in NFRs. Water injection in NFRs with mixed-wet or effectively oil-wet matrix blocks usually results in low oil recoveries. In this case, gas injection is considered to be an alternative process, where the process benefits from the gravity forces and the process is called gas-oil gravity drainage.

In this study, the effect of matrix wettability on the efficiency of gravity drainage by CO2 injection is addressed. Laboratory experiments and numerical simulation were performed to analyze the process under different wettability conditions of the matrix. It is concluded that for a system with an effectively oil-wet matrix, water is the most non-wetting phase while CO2 is the intermediate-wetting phase. In the three phase setting, which includes carbon dioxide, this is considered favorable for oil production. However, with a strongly water-wet matrix, CO2 is always the least wetting phase. For this condition, it turns out that when water is displaced by the gravity drainage process part of the oil is also produced. It is observed that higher oil recoveries are achieved by CO2 injection in an oil-wet matrix block.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201412723
2015-06-01
2020-05-30
Loading full text...

Full text loading...

References

  1. Ameri, A., Shojai Kaveh, N., Rudolph, E. S. J., Wolf, K. H., Farajzadeh, R. and Bruining, J.
    [2013] Investigation on Interfacial Interactions among Crude Oil–Brine–Sandstone Rock–CO2 by Contact Angle Measurements. Energy & Fuels27 (2), 1015–1025.
    [Google Scholar]
  2. Fernø, M., Haugen, Å. and Graue, A.
    [2011] Wettability effects on the matrix-fracture fluid transfer in fractured carbonate rocks. Journal of Petroleum Science and Engineering77 (1), 146–153.
    [Google Scholar]
  3. Parsaei, R. and Chatzis, I.
    [2011] Experimental investigation of production characteristics of the gravity-assisted inert gas injection (GAIGI) process for recovery of waterflood residual oil: effects of wettability heterogeneity. Energy & Fuels25(5), 2089–2099.
    [Google Scholar]
  4. Salimi, H. and Bruining, J.
    [2011] The Influence of Heterogeneity Wetting and Viscosity Ratio on Oil Recovery From Vertically Fractured Reservoirs. SPE Journal16 (02), 411–428.
    [Google Scholar]
  5. Suicmez, V. S., Piri, M. and Blunt, M. J.
    [2007] Pore-scale simulation of water alternate gas injection. Transport in porous media66 (3), 259–286.
    [Google Scholar]
  6. Wu, S. and Firoozabadi, A.
    [2010] Effect of Salinity on Wettability Alteration to Intermediate Gas-Wetting. SPE Journal13 (2), 228–245.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201412723
Loading
/content/papers/10.3997/2214-4609.201412723
Loading

Data & Media loading...

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