Redeveloping Mature Fractured Carbonate Reservoirs

نوع مقاله : مقاله پژوهشی


Professor of Geological Engineering, University of Waterloo, Ontario CANADA


Naturally fractured carbonate reservoirs (NFCRs) comprise the majority of the oil and gas reservoirs around the Persian Gulf.  Many of these reservoirs have a long history of exploitation, but vast amounts of oil remain in place.  A major redevelopment process for light oil based NFRs will likely be the use of horizontal wells combined with gravity drainage at constant pressure based on voidage replacement with natural gas (top-down) and natural bottom water drive or deliberate bottom water injection (bottom up), or controlled flank water invasion for reservoirs with adequate dip.  The excellent recovery factors achieved in Alberta NFCRs depends on appropriate well placement, careful voidage replacement management, and continuous monitoring of pressures, rates and fluid ratios.
Geomechanical aspects of such a redevelopment approach may involve the placing of horizontal wells in orientations conducive to small-scale well stimulation activities revolving around hydraulic fracturing.  Such fracturing helps guarantee that sufficient aperture vertical channels are available so that stable gravity drainage can develop and give adequate production rates per well.
The proposed approach and information needs for the proper placement of wells and appropriate stimulation practices are outlined.  In particular, good understanding of reservoir permeability distribution, water/oil interfaces, lithology data, and in situ stress field data are needed, and this is more challenging in reservoirs that have already gone through some amount of pressure depletion.


Ahmadi, MA; Ebadi, M; Hosseini, S-M. 2014. Prediction breakthrough time of water coning in the fractured reservoirs by implementing low parameter support vector machine approach. Fuel 117, 579–589.
Allan, J; Qing Sun, S. 2003. Controls on Recovery Factor in Fractured Reservoirs: Lessons Learned from 100 Fractured Fields. Proc. 2003 SPE Annual Technical Conf. and Exhibition, Denver CO. SPE 84590, 18 p.
Berg, RR; DeMis, WD; Mitsdarffer, AR. 1994. Hydrodynamic Effects on Mission Canyon (Mississippian) Oil Accumulations, Billings Nose Area, North Dakota. AAPG Bulletin 78(4), 501-518.
Clemens, T; Wit, K. 2001. The Effect of Fracture Spacing on Gas/Oil Gravity Drainage in Naturally Fractured Reservoirs. Proceedings 2001 SPE Annual Technical Conference and Exhibition, New Orleans, Paper SPE71507-MS, 7 p.
Collins, PM. 2005. Geomechanical Effects on the SAGD Process. Proc. 2005 SPE International Thermal Operations and Heavy Oil Symposium, Calgary Alberta, SPE 97905, 12 p.
de Gennes, PG. 1985. Wetting: statics and dynamics. Reviews in Modern Physics 57, 827 ff.
Hagoort, J. 1980. Oil Recovery by Gravity Drainage. Society of Petroleum Engineers Journal 20(03). Paper SPE7424-PA 12 p. DOI .
Ikwumonu, A; Rawnsley, KD; Al-Habsi, M; Penney, RK. 2007. Key Learnings from History Matching a Thermally Assisted Gas Oil Gravity Drainage Pilot in Fractured Reservoirs. Proc. International Petroleum Technology Conference, Dubai UAE. Paper IPTC-11411, 10 p. DOI .
Irwin, DD; Batycky, JP. 1997. The Successive Displacement Process: Oil Recovery During Blowdown. SPE Reservoir Engineering Journal (November Issue), 240-245.
Ito, Y; Ichikawa, M; Hirata, T. 2000. The growth of the steam chamber during the early period of the UTF Phase B and Hangingstone Phase I projects, Proceedings Canadian International Petroleum Conference, Calgary Alberta, Paper 2000-05 of the Petroleum Society of CIM, 16 p.
Kantzas, A; Chatzis, I; Dullien, FAL. 1988. Enhanced Oil Recovery by Inert Gas Injection. Proc. SPE Enhanced Oil Recovery Symposium, Tulsa OK. Paper SPE 17379, 10 p. DOI .
Lacy, S; Ding, W; Joshi, SD. 1992. Horizontal Well Applications and Parameters for Economic Success. Proc. Second Latin America Petroleum Engineering Conference, Caracas, Venezuela, SPE 23676, 12 p.
McIntyre, FJ; Hunter, B; See, D; Wong, F.; Fong, D; Adamache, I. 1996. Redeveloping Mature Miscible Flood Reservoirs with Horizontal Wells: A Summary of Six Years of Experience. Journal of Canadian Petroleum Technology 35(3), 46-62.
Nelson RA. 2001. Geological Analysis of Naturally Fractured Reservoirs, 2nd edition. Gulf Professional Publishing (Elsevier), 332 p.
Shafiei, A; Dusseault, MB. 2007. Development Options for Kuh-e-Mond Heavy Oil Field in Iran. Proc World Energy and Chemicals Exhibition and Conference, Kuwait, 22-25.
Wennberg, OP; Svånå, T; Azizzadeh, M; Aqrawi, AMM; Brockbank, P; Lyslo, KB; Ogilvie, S. 2006. Fracture intensity vs. mechanical stratigraphy in platform top carbonates: the Aquitanian of the Asmari Formation, Khaviz Anticline, Zagros, SW Iran. Petroleum Geoscience 12, 235–245.
Zendehboudi, S; Chatzis, I; Dusseault, MB; Shafiei, A. 2011. Empirical Modeling of Gravity Drainage in Fractured Porous Media. Energy Fuels 25(3), 1229-1241.
Zendehboudi, S; Rajabzadeh, AR; Bahadori, AR; Chatzis, I; Dusseault, MB; Elkamel, A; Lohi, A; Fowler, M. 2013. Connectionist Model to Estimate Performance of Steam-Assisted Gravity Drainage in Fractured and Unfractured Petroleum Reservoirs: Enhanced Oil Recovery Implications. Industrial and Engineering Chemistry Research, 53, 1645−1662.
Zendehboudi, S; Shafiei, A; Chatzis, I; Dusseault, MB. 2012. Numerical Simulation of Freefall and Controlled Gravity Drainage Processes in Porous Media. Journal of Porous Media, 15(3), 211-232.
Zhang, X; Spiers, CJ. 2005. Compaction of granular calcite by pressure solution at room temperature and effects of pore fluid chemistry. International Journal of Rock Mechanics & Mining Sciences 42, 950–960