Effect of Inorganic Polymer Gel Systems on Residual Resistance Factor in Fractured Core Model

Document Type: Research Article

Authors

1 Department of Chemical Engineering, Isfahan University of Technology, P.O. Box 84156-83111 Isfahan, I.R. IRAN

2 Petroleum Engineering Department, Chemistry & Chemical Engineering Research Center of Iran, P.O. Box 14335-186 Tehran, I.R. IRAN

3 Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143 Tehran, I.R. IRAN

Abstract

Excessive water production through fractures become an important problem in oil exploration of fractured reservoirs. For this purpose, polymer gels were prepared by crosslinking of aqueous solutions of polymer and crosslinker for the purpose of water management in high water cut fractured reservoirs. A copolymer of sulfonated polyacrylamide was used as polymer and chromium triacetate (Cr(OAc)3) and aluminum nitrate nonahydrate (Al(NO3)3.9H2O) were used as inorganic crosslinkers at 90oC. Two quadratic models were presented for the two inorganic polymer gel systems to predict the gelation time by using a central composite design which showed highly significant results. The results also showed that polymer concentration was the main effect on gelation time. Increasing polymer concentration leads to accelerate the gelation process and then decrease of gelation time. Based on the gelation time and strength of three dimensional structure of polymer gel, the selected polymer gels of Cr(OAc)3 and Al(NO3)3.9H2O were applied to study the performance of polymer gel system in fractured core with the same polymer concentration of 37071 ppm and the crosslinker concentration of 13096 ppm and 2707 ppm, respectively. Also, the gelation time of these polymer gels was determined 12 h and 34 h, respectively. For this purpose, the coreflooding test was carried out to measure the output flow rate before and after polymer gel treatment in order to calculate the Residual Resistance Factor (RRF). As a result, after polymer gel treatment, the output flow rate decreased intensively and by increasing injection pressure, the RRF decreased gradually. The polymer gels of Cr(OAc)3 and Al(NO3)3.9H2O in the fracture were renitent up to 70 and 60 bar against the water pressure drop, while these polymer gels were renitent up to 60 and 40 bar against the oil pressure drop, respectively. The polymer gel of Cr(OAc)3 demonstrated higher residual resistance factor than the polymer gel of Al(NO3)3.9H2O.

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[1] Bai Y., Wei F., Xiong C., Li J., Jiang R., Xu H., Shu Y., Effects of Fracture and Matrix on Propagation Behavior and Water Shut-off Performance of a Polymer Gel, Energy Fuels, 29: 5534−5543 (2015).

[4] Zhao G., Dai C.L., Chen, A., Yan, Z., Zhao, M.W., Experimental Study and Application of Gels Formed by Nonionic Polyacrylamide and Phenolic Resin for In-depth Profile Control, J. Pet. Sci. Eng., 135: 552–560 (2015).

[5] Saghafi H.R., Naderifar A., Gerami S., Farasat A., Performance Evaluation of Viscosity Characteristics of Enhanced Preformed Particle Gels (PPGs), Iran. J. Chem. Chem. Eng. (IJCCE), 35(3): 83–92 (2016).

[6] Arnold R., Burnett D.B., Elphick J., Feeley T.J., Galbrun M., Hightower M., Jiang Z., Khan M., Lavery M., Luffey F., Verbeek P., Managing Water – from Waste to Resource, Oilfield Review., 16(2): 26–41 (2004)

[7] Bai B., Zhou J., Yin M., A Comprehensive Review of Polyacrylamide Polymer Gels for Conformance Control, Petrol. Expl. Develop.,42(4): 525–532 (2015).

[8] Sun X., Bai B., Comprehensive Review of Water Shutoff Methods for Horizontal Wells, Petrol. Expl. Develop., 44(6): 1022–1029 (2017)

[11] Nguyen N. T. B., Tu T. N., Bae W., Dang C. T. Q., Chung T., Nguyen H. X., Gelation Time Optimization for an HPAM/Chromium Acetate System: The Successful Key of Conformance Control Technology, Energy Sources, Part A, 34: 1305–1317 (2012)

[12] Abedi Lenji M., Haghshenasfard M., Vafaie Sefti M., Baghban Salehi M., Mousavi Moghadam A., Numerical Modeling and Experimental Investigation of Inorganic and Organic Crosslinkers Effects on Polymer Gel Properties, J. Pet. Sci. Eng., 160: 160–169 (2018).

[13] Hardy M., Botermans W., Hamouda A., Valdal J., Warren J., “The First Carbonate Field Application of a New Organically Crosslinked Water Shutoff Polymer System”, In: SPE International Symposium on Oilfield Chemistry, Society of Petroleum Engineers (1999).

[15] Jia H., Zhao J.Z., Jin F.Y., Pu W.F., Li Y.M., Li K.X., Li J.M., New Insights into the Gelation Behavior of Polyethyleneimine Crosslinking Partially Hydrolyzed Polyacrylamide Gels, Ind. Eng. Chem. Res., 51: 12155–12166 (2012).

[16] Albonico P., Lockhart T.P., “Divalent Ion-Resistant Polymer Gels for High Temperature Applications: Syneresis Inhibiting Additives”, In: SPE International Symposium on Oilfield Chemistry, Society of Petroleum Engineers (1993).

[17] Moradi-Araghi A., A Review of Thermally Stable Gels for Fluid Diversion in Petroleum Production, J. Pet. Sci. Eng., 26: 1–10 (2000).

[18] Liu Y., Dai C., Wang K., Zhao M., Zhao G., Yang S., Yan Z., You Q., New Insights into the Hydroquinone (HQ)–Hexamethylenetetramine (HMTA) Gel System for Water Shut-off Treatment in High Temperature Reservoirs, J. Ind. Eng. Chem., 35: 20–28 (2016).

[19] Al-Muntasheri G.A., Nasr-El-Din H.A., Hussein I.A., A Rheological Investigation of a High Temperature Organic Gel Used for Water Shut-off Treatments, J. Pet. Sci. Eng., 59: 73–83 (2007).

[20] Bai Y., Xiong C., Wei F., Li J., Shu Y., Liu D., Gelation Study on a Hydrophobically Associating Polymer/Polyethylenimine Gel System for Water Shut-off Treatment, Energy Fuels, 29(2): 447–458 (2015).

[21] Baghban Salehi M., Vafaie Sefti M., Mousavi Moghadam A., Dadvand Koohi A., Study of Salinity and pH Effects on Gelation Time of a Polymer Gel Using Central Composite Design Method, J. Macromol. Sci. B Phys., 51(3): 438–451 (2012).

[24] Song Z., Liu L., Wei M., Bai B., Hou J., Li Z., Hu Y., Effect of Polymer on Disproportionate Permeability Reduction to Gas and Water for Fractured Shales, Fuel, 143: 28–37 (2015).

[25] Ziabasharhagh M., Mosallat F., Shahnazari M. R., Experimental Investigation of the Permeability and Inertial Effect on Fluid Flow through Homogeneous Porous Media, Iran. J. Chem. Chem. Eng. (IJCCE), 27(2): 33–38 (2008)

[26] Song Z., Liu L., Hou J., Bai B., Su W., Effect of Polymer on Gas Flow Behavior in Microfractures of Unconventional Gas Reservoirs, J. Nat. Gas. Sci. Eng., 23: 26–32 (2015).