Study of Nuclear Magnetic Resonance on Imbibition Mechanics of Conglomeratic Cores

Abstract:

In order to deeply study the imbibition mechanism of conglomerate reservoir, the law that fluid flows in different sizes of pores in the process of imbibition was researched by nuclear magnetic resonance. First, the conglomerate core was saturated by the simulated formation water, and then was saturated by polyfluoroethylene oil to form the irreducible water. During the experiment of imbibition, several time points were selected and the conglomerate core was tested by NMR. According to the relaxation time T2, pores were divided into large, middle and small three size ranges. As the imbibition time increases, the available rate of middle and small pores increase faster than large pores. The available rate of middle and small pores both exceed 50%, but the one of large pores is lower than 35%. The difference of mechanism between imbibition and waterflooding is explained by their NMR test results.

• Periodical: Applied Mechanics and Materials (Volumes 110-116)
• Pages: 4128-4132
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.110-116.4128
• Online since: October 2011
• Authors: Rui Shen, Zhi Ming Hu
• Keywords: Conglomerate, Imbibition, NMR, Relaxation Time

References

[1] V.H. Nguyen, A.P. Sheppard, M.A. Knackstedt, W.V. Pinczewski, The effect of displacement rate on imbibition relative permeability and residual saturation,J. Petrol. Sci. Eng. , vol. 52, pp.54-70, June (2006).

DOI: 10.1016/j.petrol.2006.03.020

[2] H.O. Yildiz, M. Gokmen, Y. Cesur, Effect of shape factor, characteristic length, and boundary conditions on spontaneous imbibition, J. Petrol. Sci. Eng. , vol. 53, pp.158-170, September (2006).

DOI: 10.1016/j.petrol.2006.06.002

[3] S.K. Li, W.D. Liu, H.Q. Zhang, H.M. Xiao, Experimental study of spontaneous imbibition in low-permeability reservoir, Acta Petrolei Sinica, vol. 28, pp.109-112, March (2007).

[4] W.A. Edeistern, H. J Vinegar, P.N. Tutunjian, P.B. Roemer, O.M. Mueller, NMR imaging for core analysis, SPE Annual Technical Conference and Exhibition, pp.101-112, October (1988).

DOI: 10.2118/18272-ms

[5] R. Freedman, M. Flaum, G.J. Hirasaki, A. Matteson, A. Sezginer, A new NMR method of fluid characterization in reservoir rocks: experimental confirmation and simulation results, SPE J. , vol. 6, pp.452-464, December (2001).

DOI: 10.2118/75325-pa

[6] I. Hidajat, K.K. Mohanty, M. Flaum, G. Hirasaki, Study of vuggy carbonates using X-ray CT scanner and NMR, SPE Annual Technical Conference and Exhibition, pp.1-10, September, (2002).

DOI: 10.2118/77396-ms

[7] W.F. Hsu, X.Y. Li, R.W. Flumerfelt, Wettability of porous media by NMR relaxation methods, SPE Annual Technical Conference and Exhibition, pp.1027-1037, October (1992).

DOI: 10.2118/24761-ms

[8] M.P. Enwere, J.S. Archer, NMR imaging for water/oil displacement in cores under viscous-capillary force control, SPE/DOE Enhanced Oil Recovery Symposium, pp.99-104, April (1992).

DOI: 10.2118/24166-ms