The Analysis for the Effect of Effective Compressibility on Oil Recovery in Polymer Flooded Heterogeneous Reservoir

Department of Natural Resources and Environment Engineering, Hanyang University, Seoul 133-791, KoreaThe compressibility of fracture in naturally fractured reservoir is larger than the compressibility of matrix in rock,although the compressibility of a typical rock is very small. The effective compressibility including the fracturecompressibility should be considered to predict oil recovery correctly. It is hard to quantify changes of fractureaperture and pore volume in reservoir without the effective compressibility. In this study, oil recovery is analyzedby commercial simulator concerning the fracture compressibility based on fracture properties. We found that theeffective compressibility affects oil recovery with change of polymer flooding factors such as polymer molarweight, concentration and injection rate. The estimated cumulative oil production is smaller with the effective com-pressibility than without it. Also, bottomhole pressure decreases rapidly without considering effective fracture com-pressibility.

[1]  R. Aguilera.  Recovery Factors And Reserves In Naturally Fractured Reservoirs , 1999 .

[2]  A. Hassan,et al.  Overview of Polymer Flooding (EOR) in North Africa Fields - Elements of Designing a New Polymer/Surfactant Flood Offshore (Case Study) , 2012 .

[3]  Obuekwe Chukwukadibia Mogbo,et al.  Polymer Flood Simulation in a Heavy Oil Field: Offshore Niger-Delta Experience , 2011 .

[4]  D. Mamora,et al.  Simulation Study on Surfactant-Polymer Flood Performance in Fractured Carbonate Reservoir , 2011 .

[5]  이태훈,et al.  Development of 3D DFN Model with Rectangular Fracture Type , 2009 .

[6]  Tae Hyung Kim,et al.  Fracture characterization and estimation of fracture porosity of naturally fractured reservoirs with no matrix porosity using stochastic fractal models , 2007 .

[7]  Jinmei Wang,et al.  Key Aspects of Project Design for Polymer Flooding , 2007 .

[8]  David S. Schechter,et al.  Investigating Fracture Aperture Distributions Under Various Stress Conditions Using X-Ray CT Scanner , 2004 .

[9]  R. Aguilera.  Effect of Fracture Compressibility on Oil Recovery From Stress-Sensitive Naturally Fractured Reservoirs , 2003 .

[10]  Ronald A. Nelson,et al.  Geologic Analysis of Naturally Fractured Reservoirs , 1986 .

[11]  S. Gregory.  Determination of Molecular Weights and Molecular Weight Distribution of Polyacrylamides , 1984 .

[12]  L. K. Thomas,et al.  Fractured Reservoir Simulation , 1980 .

[13]  F. O. Jr. Jones,et al.  A Laboratory Study of the Effects of Confining Pressure on Fracture Flow and Storage Capacity in Carbonate Rocks , 1973 .