A Comparative Experimental Study of Sweep Efficiency in Naturally Fractured Reservoirs

James J. Sheng, Faizan Nasir


In this paper the performance of gel and polymer in fractured core plugs in laboratory is compared. The experimental results show that in a naturally fractured reservoir, the best solution to improve oil recovery should be such that the gel particle sizes are larger than the pore sizes, and the solution viscosity becomes very high after the particles contact with water. If the fracture is wide, the improvement of sweep efficiency by a polymer solution is limited because the polymer solution could flow through the fracture channel. The results in this paper provide us with guidelines to select proper polymers to improve sweep efficiency.
Key words: Sweep efficiency; Naturally fractured reservoirs; Polymer solution; Oil recovery


Sweep efficiency; Naturally fractured reservoirs; Polymer solution; Oil recovery

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[1] Chang, H. L., Zhang, Z. Q., Wang, Q. M., Xu, Z. S., Guo, Z. D., Sun, H. Q., Cao, X. L., & Xiao, Q. (2006). Advances in Polymer Flooding and Alkaline/Surfactant/Polymer Processes as Developed and Applied in the People’s Republic of China. JPT, 2, 84–89.

[2] Seright, R. S. (2006). Discussion of SPE 89175. JPT, 5, 80.

[3] Shi, D. H., Xu, H.X., & Pu, C. S. (2011). Deep Profile Control Using Cross-Linked Polymer in the Xi-Fong Field. Oil and Gas surface Engineering, 30(1), 30-32.

[4] Fathi-Najafabadi, N., Delshad, M., Sepehrnoori, K., Nguyen, Q. P., & Zhang, J. Y. (2008). Chemical Flooding of Fractured Carbonates Using Wettability Modifiers. Paper SPE 113369 Presented at the SPE/DOE Symposium on Improved Oil Recovery, 20-23 April, Tulsa, OK.

[5] ASTM. (2009). Standard Test for Compressive Strength of Cylindrical Concrete Specimens. Designation: C39/C39M – 09a, ASTM International, Conshohocken, PA.

[6] Nasir, F. (2012). A Comparative Experimental Study for Improvement of Sweep Efficiency in Naturally Fractured Reservoirs (Master’s thesis). Texas Tech University, Lubbock, TX.

DOI: http://dx.doi.org/10.3968%2Fj.aped.1925543820130602.1726


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