To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study

Document Type : Research Paper

Authors

Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz, Iran

Abstract

Future exploitation scheme of an oil reservoir in each cycle within its production life depends on the profitability of the current extraction scenario compared with predicted recoveries that acquire with applying other available methods. In fractured reservoirs appropriate time to pass from the gas injection process into chemical enhanced oil recovery (EOR) firmly depends on the oil extraction efficiency within the gas invaded zone. Several variables including fluid characteristic, fracture network and matrix units properties, etc., impact gas-oil gravity drainage (GOGD) performance within the gas invaded zone. In this work, CMG GEM and ECLIPSE 300 were used to simulate GOGD mechanism in several 2D cross-sectional models to investigate effects of the matrix height, matrix rock type, fracture network transmissibility, and miscibility conditions on the oil extraction rate, change of average pressure and producing gas-oil ratio (GOR). Results showed that in small heights of the matrix units especially at compacted rock types, GOGD was weak that caused a rapid decrease in oil production rates and early increase in producing GOR. Results also showed that wherever the matrix porosity and permeability values were high, recovery was accelerated and GOR remained constant for longer exploitation times. Furthermore, using high-pressure lean gas injection for miscible GOGD gives higher extraction efficiencies rather than applying rich or enriched gas.

Keywords

References

[1] Warren JE, Root PJ. The behavior of naturally fractured reservoirs. Society of Petroleum Engineers Journal. 1963 Sep 1;3(03):245-55.
[2] Firoozabadi A, Thomas LK. Sixth SPE comparative solution project: Dual-porosity simulators. Journal of Petroleum Technology. 1990 Jun 1;42(06):710-63.
[3] Penuela G, Civan F, Hughes RG, Wiggins ML. Time-dependent shape factors for interporosity flow in naturally fractured gas-condensate reservoirs. InSPE Gas Technology Symposium 2002 Jan 1. Society of Petroleum Engineers.
[4] Sarma P, Aziz K. New transfer functions for simulation of naturally fractured reservoirs with dual porosity models. InSPE Annual Technical Conference and Exhibition 2004 Jan 1. Society of Petroleum Engineers.
[5] Rossen RH, Shen EI. Simulation of gas/oil drainage and water/oil imbibition in naturally fractured reservoirs. SPE Reservoir Engineering. 1989 Nov 1;4(04):464-70.
[6] Dean RH, Lo LL. Simulations of naturally fractured reservoirs. SPE Reservoir Engineering. 1988 May 1;3(02):638-48.
[7] Wit K, Clemens T, Rijkels L. Simulation of gas/oil gravity drainage in a stack of interacting blocks: pseudo relations for a limited number of gridblocks. InSPE Annual Technical Conference and Exhibition 2002 Jan 1. Society of Petroleum Engineers.
[8] Ladron de Guevara-Torres JE, Rodriguez-de la Garza F, Galindo-Nava A. Gravity-Drainage and Oil-Reinfiltration Modeling in Naturally Fractured Reservoir Simulation. SPE Reservoir Evaluation & Engineering. 2009 Jun 1;12(03):380-9.
[9] Jadhawar PS, Sarma HK. Numerical simulation and sensitivity analysis of gas-oil gravity drainage process of enhanced oil recovery. Journal of Canadian Petroleum Technology. 2010 Feb 1;49(02):64-70.
[10] Okon AN, Udoh FD. Gas-oil gravity drainage in fractured porous media. Indian Journal of Engineering. 2013;3(8):70-5.
[11] Udoh FD, Igbafe AI, Okon AN. Gas-Oil Gravity Drainage and Reinfiltration in Naturally Fractured Reservoirs. InSPE Nigeria Annual International Conference and Exhibition 2015 Aug 4. Society of Petroleum Engineers.
[12] Verlaan M, Boerrigter PM. Miscible gas-oil gravity drainage. InInternational Oil Conference and Exhibition in Mexico 2006 Jan 1. Society of Petroleum Engineers.
[13] Uleberg K, Høier L. Miscible gas injection in fractured reservoirs. InSPE/DOE Improved Oil Recovery Symposium 2002 Jan 1. Society of Petroleum Engineers.
[14] Saidian M, Masihi M, Ghazanfari MH, Kharrat R, Mohammadi S. An Experimental Study of the Matrix-fracture Interaction During Miscible Displacement in Fractured Porous Media: A Micromodel Study. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2014 Feb 1;36(3):259-66.
[15] Mohammadi S, Khalili M, Mehranfar M. The Optimal Conditions for the Immiscible Gas Injection Process: A Simulation Study. Petroleum Science and Technology. 2014 Jan 17;32(2):225-39.
[16] Bazargan M, Broumand P, Gudmundsson A. Modelling Nitrogen Gas-Assisted Gravity Drainage for Enhanced Oil Recovery in a Fractured Media. In80th EAGE Conference and Exhibition 2018 2018 Jun 11.
[17] Badakhshan A, Golshan H, Musavi-Nezhad HR, Sobbi FA. The impact of gas injection on the oil recovery of a giant naturally fractured carbonate reservoir. Journal of Canadian Petroleum Technology. 1998 Dec 1;37(12).
[18] Zobeidi K, Fassihi MR. Block to block interactions and their effects on miscibility gravity drainage in fractured carbonate reservoirs, experimental and analytical results. Journal of Petroleum Science and Engineering. 2018 May 1;164:696-708.
[19] Rahmati N, Rasaei MR. Quantifying the reimbibition effect on the performance of gas‐oil gravity drainage in fractured reservoirs: Mathematical modelling. The Canadian Journal of Chemical Engineering. 2019 Jun;97:1718-28.
[20] Zobeidi K, Fassihi MR, Rasaei MR. Description of the Results of Experiments on Developed Miscibility With Nonequilibrium Gas/Oil Gravity Drainage. SPE Journal. 2016 Jun 1;21(03):827-38.
Journal of Chemical and Petroleum Engineering
Volume 53, Issue 1
June 2019
Pages 11-24

Files

Share

How to cite

Statistics