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Research Papers: Petroleum Engineering

Experimental Investigation of Microscopic/Macroscopic Efficiency of Polymer Flooding in Fractured Heavy Oil Five-Spot Systems

[+] Author and Article Information
Mohammad Hossein Sedaghat

e-mail: m.sedaghat66@gmail.com

Mohammad Hossein Ghazanfari, Saeid Morshedi

Chemical and Petroleum
Engineering Department,
Sharif University of Technology,
Tehran, 11365-9465, Iran

Mohammad Parvazdavani

EOR Studies Center,
Research Institute of Petroleum Institute (RIPI),
Tehran, 18745-4163, Iran

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received April 8, 2012; final manuscript received December 11, 2012; published online March 25, 2013. Assoc. Editor: Rainer Tamme.

J. Energy Resour. Technol 135(3), 032901 (Mar 25, 2013) (9 pages) Paper No: JERT-12-1071; doi: 10.1115/1.4023171 History: Received April 08, 2012; Revised December 11, 2012

This paper concerns on experimental investigation of biopolymer/polymer flooding in fractured five-spot systems. In this study, a series of polymer injection processes were performed on five-spot glass type micromodels saturated with heavy crude oil. Seven fractured glass type micromodels were used to illustrate the effects of polymer type/concentration on oil recovery efficiency in presence of fractures with different geometrical properties (i.e., fractures orientation, length and number of fractures). Four synthetic polymers as well as a biopolymer at different levels of concentration were tested. Also a micromodel constituted from dead-end pores with various geometrical properties was designed to investigate microscopic displacement mechanisms during polymer/water flooding. The results showed that polymer flooding is more efficient by using hydrolyzed synthetic polymers with high molecular weight as well as locating injection well in a proper position respect to the fracture geometrical properties. In addition, by monitoring of microscopic efficiency, pulling, stripping, and oil thread flow mechanisms were detected and discussed. The results showed that flow rate, fluid type, polymer concentration, and geometrical properties of pores influence the efficiency of mentioned mechanisms. Furthermore, it was detected that polymer's velocity profile play a significant role on oil recovery efficiency by influencing both macroscopic and microscopic mechanisms. This study demonstrates different physical and chemical conditions that affect the efficiency of this enhanced oil recovery method.

Copyright © 2013 by ASME
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Figures

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Fig. 1

Schematic diagram of experimental setup

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Fig. 2

Glass type micromodels used as porous media, (a) six fractured and one nonfractured model and (b) focused model on dead end pores

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Fig. 3

Viscosity versus shear rate for polymers at the concentration of 1200 ppm in 22 °C

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Fig. 4

Polymer flooding with HPAM 3330 at the concentration of 1200 ppm in fractured and nonfractured patterns (patterns {C}, {D}, and {G})

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Fig. 5

Polymer flooding by five types of polymers (HPAM 3330, HPAM 3430, HPAM 3530, PAM 3330, and xanthan) at the same concentration of 1200 ppm in pattern {C}

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Fig. 6

Polymer flooding with four different concentrations of HPAM 3330 in pattern {C}

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Fig. 7

Polymer flooding by HPAM 3330 with the concentration of 1200 ppm for two different fracture lengths (patterns {A} and {B})

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Fig. 8

Polymer flooding by HPAM 3330 with the concentration of 1200 ppm for different fracture orientation (patterns {A}, {C}, and {D})

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Fig. 9

Polymer flooding by HPAM 3330 with the concentration of 1200 ppm for different numbers of fractures (patterns {A}, {D}, {E} and {F})

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Fig. 10

Distribution of residual oil after (a) water flooding in the flow rate of 0.0008 ml/min, (b) polymer flooding by HPAM 3330 with the concentration 300 ppm in the flow rate of 0.0008 and (c) polymer flooding by HPAM 3330 with the concentration 600 ppm in the flow rate of 0.0008 ml/min

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Fig. 11

Distribution of residual oil in a dead end pore after polymer flooding by HPAM 3330 with the concentration 600 ppm in different flow rates (a) 0.0008 ml/min and (b) 0.008 ml/min

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Fig. 12

Pulling mechanism in boundary dead-end pores of 2D model, “C” after polymer flooding by HPAM 3330 with the concentration 300 ppm in the flow rate of 0.0008 ml/min

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Fig. 13

Thin oil layer in model H after (a) water flooding in the flow rate of 0.0008 ml/min, (b) polymer flooding by HPAM 3330 with the concentration 300 ppm in the flow rate of 0.0008 ml/min and (c) polymer flooding by HPAM 3330 with the concentration 600 ppm in the flow rate of 0.0008 ml/min

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Fig. 14

Pore-throat network of 2D glassy model “C” after (a) water flooding in the flow rate of 0.0008 ml/min and (b) polymer flooding by HPAM 3330 with the concentration 900 ppm in the flow rate of 0.0008 ml/min

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Fig. 15

Residual oil in pore network of model {B} after (a) water flooding and (b) by HPAM 3330 with the concentration of 1200 ppm in the flow rate of 0.0008 ml/min

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Fig. 16

Residual oil in a dead end pore of model H illustrate (a) droplets while water flooding in the flow rate of 0.0008 ml/min and (b) oil thread while polymer flooding by HPAM 3330 with the concentration 1200 ppm in the flow rate of 0.0008 ml/min

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