1Improved Oil Recovery Research Center, NIOC, TEHRAN, I.R. IRAN
2EOR Center,Research Institute of Petroleum Industry (RIPI), TEHRAN, I.R. IRAN
3Faculty of Chemical Engineering, Amir Kabir University, Tehran, I.R. IRAN
4Department of Petroleum Engineering, Petroleum University of Technology, Ahwaz, I.R. IRAN
An improved model of mud dispersion has been introduced in this work. The advantages of this model consist of a new analytical correlation for dispersivity by using resistivity log data and using a new aspect of capacitance dispersion model. Mathematical formulations were expressed, solved by numerical model taking advantage of actual log and formation data. Achieved results yielded reasonable values and trends which can be used to predict the drilling fluid concentration near wellbore region and interpret the well log data. In comparison with the previous models (Civan and Engler, 1994; Donaldson and Chernoglazov, 1987), this model uses more reasonable data and assumptions making it closer to real conditions.
 Civan F., Engler T., Drilling Mud Filtrate Invasion-Improved Model and Solution, J. of Petroleum Science and Engineering, 18 (10), p. 1005 (1994).
 Donaldson E.C., Kendall R.F., Userda, Manning F.S., Dispersion and Tortuosity in Sandstones, "Presented for the 51st Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineering of AIME", SPE6190, New Orleans, (1976).
 Prausnitz J. M., AIChE J., 4 (1), p. 14M (1958).
 Koval E.J., SPE Jour., p. 145 (1963).
 "Petrophisical Data of Iranian South Reservoir", National Iranian South Oil Company, (2003).
 a) Perkins T.K., Johnston O.C., A Review of Diffusion and Dispersion in Porous Media, Soc. Petrol. Eng. J., 3 (1), p. 70 (1963).
b) Sahimi M., "Flow and Transport in Porous Media and Fractured Rock", VCH Co (1995)
 a) Raimondi P., Gardner G.H.F., Patrick G.B., Effect of Pore Structure and Mulecular Diffusion on the Mixing of Miscible Liquids in Porous Media, "AIChE/SPE Joint Symposium", Sanfransisco, Dec.6-9. (1959).
b) "Petrophisical Data of Iranian South Reservoir", National Iranian South Oil Company, (2003).